CN106345292A - Method for directly decomposing NO by microwave catalysis and catalyst - Google Patents

Method for directly decomposing NO by microwave catalysis and catalyst Download PDF

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Publication number
CN106345292A
CN106345292A CN201610883390.0A CN201610883390A CN106345292A CN 106345292 A CN106345292 A CN 106345292A CN 201610883390 A CN201610883390 A CN 201610883390A CN 106345292 A CN106345292 A CN 106345292A
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catalyst
sapo
microwave
reaction
direct
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周继承
欧颖缥
游志敏
徐文涛
彭康
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Xiangtan University
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Xiangtan University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8628—Processes characterised by a specific catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/82—Phosphates
    • B01J29/84—Aluminophosphates containing other elements, e.g. metals, boron
    • B01J29/85—Silicoaluminophosphates (SAPO compounds)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/30—Ion-exchange
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/34—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
    • B01J37/341—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation
    • B01J37/344—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation of electromagnetic wave energy
    • B01J37/346—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation of electromagnetic wave energy of microwave energy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
    • B01D2259/806—Microwaves

Abstract

The invention first provides a method for directly decomposing NO by microwave catalysis. The method is realized in a way that the NO in NO-containing gas is subjected to microwave catalysis at the temperature of 120 to 400DEG C by using a catalyst containing Cu-SAPO-34 and is directly decomposed into N2 and O2. According to the method disclosed by the invention, microwave is introduced and is combined with a specified denitrification catalyst for reacting, catalyzing and decomposing the NO in a microwave field by using the Cu-SAPO-34 catalyst; experiments prove that a good effect can be obtained. Particularly, the Cu-SAPO-34 and an oxide of transition metal or variant valence metal jointly form an MeOx-Cu-SAPO-34 mixed catalyst; the MeOx-Cu-SAPO-34 mixed catalyst is used for directly catalyzing and decomposing the NO at the temperature of 100 to 400DEG C, and then high activity is obtained. The method disclosed by the invention has the advantage of efficiently and directly decomposing the NO, and also has the characteristics of simple process, low cost, no secondary pollution and the like.

Description

A kind of method of direct catalytic decomposition no of microwave and a kind of catalyst
Technical field
The present invention relates to microwave catalysis field is and in particular to a kind of method of direct catalytic decomposition no of microwave and one kind are catalyzed Agent.
Background technology
With economic rapid growth, the nitrogen oxides that the mankind discharge in industrial activity and daily life are also increasingly Many, haze phenomenon is increasingly serious, and this all causes huge injury to natural ecological environment and health, eliminates noxPollution Become one of most important problem in environmental conservation.For noxFor decomposition, the nh of industrial extensive application3- scr technology is deposited Big in consumption ammonia, and product produces the significantly shortcoming such as secondary pollution to air.So not needing additional reducing agent and product no two The direct catalytic reaction of secondary pollution is the focus of current research.And direct nitrogen oxide catalytic decomposition reaction needs under normal condition Very overactivity energy, thus under low temperature, nitrogen oxide catalytic decomposition conversion ratio is all very low.Make catalyst conventional strip with metal-oxide Want more than 500 DEG C ability active under part, and no conversion ratio only has 20% about.Microwave has catalytic action, can reduce reaction Activation energy, quickening response speed, raising conversion ratio, therefore be feasible method from catalytic decomposition no under microwave exposure.
The method of removing no is broadly divided into wet denitration and Dry denitration.Wet denitration mainly adopts liquid to absorb, nox's Removal efficiency only has 70%, and haves such problems as that energy consumption is big, does not therefore have industrialization.It is to select that Dry denitration is applied to industrialized Property catalytic reduction method (scr), with ammonia as reducing agent and noxReaction generates n2And water, this is denitration skill the most ripe at present Art, but to there is catalyst in this technology be easily poisoned, and consumes nh3Amount is big, and reactor is easily corroded, catalyst operating temperature narrow range (623k-673k) defect such as.The most promising in Dry denitration at present, a kind of the most attracting denitration mode is direct catalytic decomposition Method.Directly catalytic decomposition no does not need reducing agent, and product is n2And o2, environmentally safe.No Direct Resolution is n2And o2From heat Possible (during 298k, △ g=-86kj/mol) from the point of view of on mechanics, but from the kinetics from the point of view of then be difficult to enter at low temperature This reaction of row (ea=364kj/mol).This is accomplished by finding a kind of catalyst and so that this reaction is carried out at a lower temperature.
Present inventor and its seminar are devoted to the research in microwave direct catalytic denitration field always.As applicant The following patent of earlier application.
Patent cn201110451086.6 provides a kind of microwave catalysis Chemoselective reduction method of denitration, methods described bag Include catalyst filling in the reaction tube of microwave catalysis reactor assembly and form microwave catalysis reaction bed, processed gas is passing through Gas-solid reaction is occurred to carry out denitration process during microwave catalysis reaction bed；Described catalyst is with activated carbon as base, supported active group The composite catalyst being grouped into；Described load active component is metal and its oxide or/and transition-metals and their oxides, The mass ratio of load active component load capacity is 0.1-15%；Described composite catalyst is filled in microwave catalysis reactor assembly Reaction tube in form composite microwave catalytic bed, processed gas when composite microwave catalytic bed, with multiple Activated carbon in mould assembly catalyst is that the nitric oxide in reducing agent, with gas occurs selective catalysis reduction reaction, by nitrogen oxidation Thing removes.This invention has that high conversion rate, energy consumption be little, energy-conserving and environment-protective, operating cost is low, non-secondary pollution the advantages of.
Patent cn201110451218.5 provides a kind of two-stage nitration microwave catalysis reaction bed method of denitration, and methods described includes In the reaction tube of microwave catalysis reactor assembly, catalyst filling forms microwave catalysis reaction bed, and processed gas is by micro- Gas-solid reaction is occurred to carry out denitration process during ripple catalytic bed；Described microwave catalysis reaction bed is two independent mutual strings The microwave catalysis reaction bed of connection, the catalyst of first paragraph microwave catalysis reaction bed is cu-hzsm-5 or mn/mgfe2o4Catalyst； The catalyst of second segment microwave catalysis reaction bed is activated carbon or activated carbon supported mno, cuo or ceo-cuo, mgo-feox, The catalyst of ceo-zro2；Processed gas order passes through first paragraph and second segment microwave catalysis reaction bed, successively occurs directly Decomposition reaction and Chemoselective reduction, by removal of nitrogen oxide.This invention have non-secondary pollution, corrosion-free, conversion ratio is high, Energy consumption is little, energy-conserving and environment-protective, and the low advantage of operating cost.
Patent cn201110451237.8 provides a kind of method of denitration of microwave catalysis Direct Resolution no, will be filled with catalysis The reaction tube of agent is arranged on composition reaction bed in microwave field, and described reaction tube adopts quartz glass or other electromagnetic wave transparent material systems Make；Flue gas/exhaust gas containing no are when by reaction bed, under the reaction temperature setting, common in microwave field and catalyst Carry out gas solid catalytic reaction under effect；It is characterized in that: the catalyst in described reaction bed is copper zeolite catalyst cu- zsm-5；The reaction bed temperature of described reaction is 100 DEG C～450 DEG C, preferably 280 DEG C～380 DEG C.Processed gas passes through Conversion of nitric oxide gas during microwave catalysis reaction bed, with copper zeolite cu-zsm-5 as catalyst, in direct catalytic decomposition gas For nitrogen and oxygen, by removal of nitrogen oxide.This invention has that Direct Resolution high conversion rate, energy consumption be little, energy-conserving and environment-protective, no reduces Agent consumption, the low advantage of operating cost.
Patent application cn 201410737055.0 provides a kind of perovskite type catalyst to be catalyzed the side of Direct Resolution no denitration Method, methods described is carried out in microwave field, and described catalyst is Manganese perovskite catalyst.Preferably described catalyst is bamn1-xmgxo3, wherein x is 0～0.4.When being coordinated using perovskite catalyst specific in this invention and microwave, can be Direct catalytic decomposition no under the conditions of low temperature and elevated oxygen level.In this invention, microwave catalysis Direct Resolution no reaction does not have secondary dirt Dye, and process is simple, easy to operate easily controllable, no removal efficiency is high, and antioxidant is strong, and operation temperature is low, energy-conserving and environment-protective, fortune Row low cost.Flue gas after being processed using the method or waste gas can directly reach discharging standards.
Patent application cn 201410736555.2 provides a kind of method of catalytic denitration, and methods described is entered in microwave field OK, and used catalyst is nickeliferous metal composite oxide, described nickeliferous metal composite oxide is cu-ni composition metal Oxide or ni-fe metal composite oxide.When preferably in described nickeliferous metal composite oxide, the mole of nickel is 1, The mole of copper or ferrum is 0.4～2.5.In this invention, microwave catalysis Direct Resolution no reaction does not have secondary pollution, and technique Simply, easy to operate easily controllable, no removal efficiency height (no conversion ratio is up to 98.9%), antioxidant is strong, and operation temperature is low, section Energy environmental protection, operating cost is low.
Patent application cn 201410737013.7 provides a kind of Engineering of Supported Metal Oxide Catalysts catalysis Direct Resolution no The method of denitration, methods described is carried out in microwave field, and described catalyst is support type O composite metallic oxide catalyst, institute Stating support type O composite metallic oxide catalyst is metal composite oxide moxIt is supported on al2o3On carrier, described m be selected from Two or three of cerium, copper, manganese and nickel.Preferably described catalyst is selected from cecuox/al2o3、cemnox/al2o3、ceniox/ al2o3And cecumnox/al2o3.In the present invention, microwave catalysis Direct Resolution no reaction does not have secondary pollution, and process is simple, Easy to operate easily controllable, no removal efficiency is high, and antioxidant is strong, and operation temperature is low, energy-conserving and environment-protective, and operating cost is low.Using this Flue gas after method process or waste gas can directly reach discharging standards.
Patent application cn 201410834865.8 provides a kind of method that microwave catalysis decompose no denitration, including in microwave In the reaction tube of catalytic reactor, filler metal oxide/cu-zsm-11 catalyst forms microwave catalysis reaction bed, pending Waste gas when by microwave catalysis reaction bed, issue raw gas-solid catalytic reaction in the collective effect of microwave and described catalyst, its In the direct catalytic decomposition of no become n2And o2；Described metal-oxide is ni2o3Or mno2.Described catalyst is more preferably ni2o3/ cu-zsm-11.
The method that direct catalytic decomposition no of the good microwave of reaction effect homogeneously should have been obtained in foregoing invention, but this area Technical staff can also make more effort in terms of the development and application of catalyst, to reduce catalyst cost further, to change The conversion ratio of the condition of kind catalytic reaction and raising no is so that microwave catalysis Direct Resolution no can be applied to industrial denitration neck early Domain.
Content of the invention
For solving the problems, such as at least a portion in proposing in background technology, the present invention provides a kind of new microwave directly to urge Change the method decomposing no.
Therefore, present invention firstly provides a kind of method of direct catalytic decomposition no of microwave, including using containing cu-sapo-34 Catalyst temperature be no Direct Resolution in microwave catalysis gas containing no at 120～400 DEG C be n2And o2.
Present inventor passes through the reading of prior art, wraps in numerous catalyst that can be used for denitration Molecular sieve containing cu/sapo-34.Such as stone beautiful jade and in ferrum et al. " nh disclosed in the document of Acta PhySico-Chimica Sinica3- scr course of reaction Middle nh3And noxCharacterization of adsorption on cu/sapo-34 molecular sieve catalyst and effect ".Specifically, by ion exchange legal system Obtain cu/sapo-34 chabazite molecular sieve catalyst, have studied nh simultaneously3And nox(no and no2) absorption on the catalyst Position, adsorption strength, adsorbance and the rate of adsorption, obtained absorption property on cu/sapo-34 for the differential responses gas and its nh3SCR (nh3- scr) reaction in effect.noxCan be inhaled to aoxidize and in the form of nitrate/nitrite It is attached on cu species.Likewise, Yan Chundi and Cheng Hao et al. disclosed in chemistry of fuel journal, " cu exchange capacity is to cu-sapo-34 Nh on catalyst3SCR noxThe impact of reaction ".Specifically, result shows, cu2+It is cu-sapo-34 catalyst In nh3Chief active center in-scr reaction, with the increase of cu exchange capacity, after the low temperature scr activity of catalyst first raises Reduce.When copper exchange capacity is 2.37%, the low temperature active of cu-sapo-34 catalyst is best, noxConversion ratio is when 185 DEG C Reach 80.0%, and up to 98.7%.icp、h2- tpr, ft-ir and nh3The characterization results such as-tpd show, cu introduces and not only produces Give birth to new ammonia adsorption site, increased lewis acid amount, and slightly reduce the adsorption strength of ammonia on sapo-34.Continue to increase Plus cu exchange capacity instead results in the scr activity decrease of catalyst, this is due to substantial amounts of cu2+Instead of bridge hydroxyl group si-oh-al In h it is suppressed that scr reaction in nh3Absorption, storage and migration in catalyst surface.Additionally, higher cu exchange capacity is also unfavorable In the high-temperature hydrothermal stability improving cu-sapo-34.
But it is all open cu-sapo-34 catalyst in above-mentioned document in nh3Denitration in-scr reaction.And it is public Open the scheme using cu-sapo-34 catalyst no Direct Resolution.Present inventor considers under normal conditions The direct nitrogen oxide catalytic decomposition of cu-sapo34, temperature needs conversion ratio more than 600 DEG C just can reach 90%.Accordingly, it is considered to adopt Combine direct catalytic decomposition no of cu-sapo34 with microwave.Test finds, achieves good effect.Especially metal-oxide With cu-sapo34 synergism, when being provided commonly for direct catalytic decomposition no of microwave, experiment achieves all well and good result.
In a kind of specific embodiment, described catalyst is meox/ cu-sapo-34, wherein said me be metallic copper, Manganese or nickel, x is the number between 1～2.
In a kind of specific embodiment, described catalyst is ni2o3Ni in/cu-sapo-34, and catalyst2o3Shared Mass percent be 40～60%.
In a kind of specific embodiment, described catalyst is blended with cu-sapo-34 and grind by metal-oxide Molding is prepared from.
In a kind of specific embodiment, metal-oxide after grinding and cu-sapo-34 in 5～15mpa lower sheeting, And 20～80 mesh sieves excessively obtain meox/ cu sapo 34 mixed catalyst.
In a kind of specific embodiment, the reaction temperature of microwave catalysis no Direct Resolution is 150～400 DEG C, preferably 250 ～350 DEG C.
The present invention also provides a kind of catalyst for direct catalytic decomposition no of microwave, and described catalyst is meox/cu- Sapo-34, wherein said me are metallic copper, manganese or nickel, and x is the number between 1～2.
In a kind of specific embodiment, described catalyst is ni2o3Ni in/cu-sapo-34, and catalyst2o3Shared Mass percent be 40～60%.
In a kind of specific embodiment, described catalyst is by sapo-34 molecular sieve first in nh4Carry out ammonium salt in cl solution Pretreatment, then prepare cu-sapo-34 molecular sieve catalyst with microwave liquid-phase ion exchange.
Beneficial effect: 1) present invention introduces the new technique that combines of microwave and specific denitrating catalyst, by cu-sapo-34 Catalyst carries out catalytic reaction in microwave field and decomposes no, and experiment proof can obtain good effect.Especially cu-sapo- 34 form meo together with the oxide of transition or variable valency metal elementx- cu-sapo34 mixed catalyst, it is directly catalyzed and divides Solution no just has very high activity at 100～400 DEG C.2) no Direct Resolution can be n by the inventive method2And o2, in course of reaction It is not required to add the reducing agents such as ammonia, ammonium salt and methane, there is the advantage of efficient Direct Resolution no, and there is process is simple, cost Cheap, the features such as non-secondary pollution.
Specific embodiment
The present invention is further illustrated by specific examples below, but protection scope of the present invention is not limited to that.
Embodiment 1
The preparation of catalyst: weigh appropriate sapo-34 molecular sieve, add a certain amount of nh4Cl solution, with certain solid-to-liquid ratio Ammonium salt pretreatment is carried out to sapo-34, subsequently prepares cu-sapo-34 molecular sieve catalyst with microwave liquid-phase ion exchange.
Subsequently cu-sapo-34 molecular sieve, with certain proportion and metal-oxide mechanical mixture, is fully ground, prepares Meox/cu-sapo-34 (me=cu, mn, ni) mixed catalyst, 10mpa pushes sheetmolding, screens out 20-80 mesh granule, For catalytic decomposition no reaction direct under microwave exposure.
Embodiment 2
The present embodiment investigates no in cu-sapo-34 catalytic decomposition mixed gas containing no under different temperatures and oxygen concentration N in resolution ratio and product2Selectivity.In the present embodiment, catalyst quality is 2g, no concentration 1000ppm, entrance mixed gas Flow is 120ml/min, and wherein oxygen volume flow is 6ml/min or 0, n2As Balance Air.Reaction pressure is normal pressure, passes through Adjust microwave power to regulate and control the temperature of reaction bed.
Table 1
As can be seen from Table 1, for cu-sapo-34 catalyst, the reaction temperature of microwave catalysis direct denitration only up to It is raised to 180 DEG C, but it just has preferable activity at low temperature, and the rising with temperature, no resolution ratio is gradually increased, oxygen concentration Impact very little to denitration reaction.
Embodiment 3
The present embodiment investigate different mixed catalysts at different temperatures in catalytic decomposition mixed gas containing no no decomposition Efficiency.Used in the present embodiment, composite catalyst quality is 2g, and metal-oxide and cu-sapo-34 mixed proportion are quality Ratio 1:1, no concentration 1000ppm, entrance mixed gas flow is 120ml/min, and wherein oxygen volume flow is 6ml/min, n2 As Balance Air.Reaction pressure is normal pressure.Adjust reaction bed temperature by adjusting microwave power.
Table 2
Different composite its optimal reaction temperature of type catalyst being mixed with same ratio as can be seen from Table 2 and no are High conversion is different, but three relatively in, ni2o3/ cu-sapo-34 composite catalyst catalytic decomposition no effect is best, The conversion ratio of its no Direct Resolution reaches as high as 93.8%.
Embodiment 4
The present embodiment investigates the ni of different mixing proportion preparation2o3/ cu-sapo-34 composite catalyst is in different bed temperature The lower decomposition efficiency containing no in nitric oxide production mixed gas for the catalysis of degree.In the present embodiment, composite catalyst quality is 2g, Mixing ratio refers to ni2o3Quality and cu-sapo-34 mass ratio, no concentration 1000ppm, entrance mixed gas flow is 120ml/min, Wherein oxygen volume flow is 6ml/min, n2As Balance Air, reaction pressure is normal pressure.
Table 3
From table 3 it can be seen that the consumption of each component produces certain impact to no conversion ratio in composite catalyst of the present invention.
Embodiment 5
The present embodiment mainly investigates the ni being mixed with 1:1 ratio2o3/ cu-sapo-34 composite catalyst is in different oxygen Catalytic decomposition no performance under concentration and vapour concentration.The present embodiment catalyst quality 2g, entrance mixed gas flow is 120ml/ Min, reaction pressure is normal pressure.
Table 4
As can be seen from Table 4, oxygen concentration reacts impact very little to microwave exposure catalytic decomposition no, and the change of vapour concentration No conversion ratio can be produced more significantly to be affected.
Embodiment 6
The present embodiment mainly investigates the ni being mixed with 1:1 ratio2o3/ cu-sapo-34 composite catalyst in temperature is 350 DEG C, under different air speeds catalytic decomposition no performance.In the present embodiment, reaction pressure is normal pressure.
Table 5
As seen from the results in Table 5, the increase of gas space velocity makes no conversion ratio be greatly lowered, and gas space velocity is as little as 1800ml·g-1˙h-1When no conversion ratio reach as high as 97.3%.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made any repair Change, equivalent, improvement etc., should be included within the scope of the present invention.

Claims (9)

1. the method for direct catalytic decomposition no of a kind of microwave, including using the catalyst containing cu-sapo-34 temperature be 120～ No Direct Resolution in microwave catalysis gas containing no at 400 DEG C is n2And o2.
2. according to claim 1 method it is characterised in that described catalyst be meox/ cu-sapo-34, wherein said me For metallic copper, manganese or nickel, x is the number between 1～2.
3. according to claim 2 method it is characterised in that described catalyst be ni2o3In/cu-sapo-34, and catalyst ni2o3Shared mass percent is 40～60%.
4. according to claim 2 method it is characterised in that described catalyst is by metal-oxide and cu-sapo-34 warp Mix and grind molding to be prepared from.
5. according to claim 4 method it is characterised in that metal-oxide and cu-sapo-34 after grinding 5～ 15mpa lower sheeting, and 20～80 mesh sieves excessively obtain meox/ cu sapo 34 mixed catalyst.
6. according to claim 1 method it is characterised in that microwave catalysis no Direct Resolution reaction temperature be 150～400 DEG C, preferably 250～350 DEG C.
7. a kind of catalyst for direct catalytic decomposition no of microwave, described catalyst is meox/ cu-sapo-34, wherein said Me is metallic copper, manganese or nickel, and x is the number between 1～2.
8. according to claim 7 catalyst it is characterised in that described catalyst be ni2o3/ cu-sapo-34, and catalyst Middle ni2o3Shared mass percent is 40～60%.
9. according to claim 7 or 8 catalyst it is characterised in that described catalyst by sapo-34 molecular sieve first in nh4cl Carry out ammonium salt pretreatment in solution, then prepare cu-sapo-34 molecular sieve catalyst with microwave liquid-phase ion exchange.
CN201610883390.0A 2016-10-10 2016-10-10 Method for directly decomposing NO by microwave catalysis and catalyst Pending CN106345292A (en)

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Application publication date: 20170125