CN1067832A - A kind of normal temperature composite catalyst and catalytic unit thereof - Google Patents

Abstract

This CO that is used in ₂The composite catalyst of gas laser system and device thereof, its composite catalyst is mixed in the porous prilled carbon fiber in the diffusion of 0.1-5% ratio by Metal Palladium or platinum, by 1: 1-1: 50 proportionings and silica alumina ratio were 5-20 graininess, through the formulated graininess of the zeolite of ion-exchange treatment, granularity is 1-10 millimeters.Catalytic unit is made up of metal shell and screen pack.Screen pack is made up of more than one woven wire interlayer, and the woven wire interlayer is with loose fixing composite catalyst of the present invention.This device CO in the active medium that can realize at normal temperatures regenerating ₃, and eliminate NO simultaneously _xAccumulation.

Description

A kind of normal temperature composite catalyst and catalytic unit thereof

The invention belongs to laser technology field, be specially adapted to gas laser system.

Because CO ₂CO in the active medium in the laser works process ₂Disassociation and electronegative gas NO _XObjectionable impurities produces, stockpiles, and causes CO ₂The laser instrument discharge instability, the beam quality variation, power output descends and even laser instrument can't operate as normal.For this reason, at CO ₂Need in the laser works process constantly to replenish and change even all change working gas in the laser instrument.At present, the working gas of this active medium is a kind of by CO ₂, H _e, N ₂The mist of forming, wherein helium (H _e) content is the 50-70%(intrinsic standoff ratio), China belongs to poor helium state basically, and helium costs an arm and a leg, and improves CO ₂Laser instrument is once inflated the closed operation life-span and is had the important practical meaning, and possesses CO simultaneously ₂Regeneration and elimination NO _XThe research of the composite catalyst of effect is the present focus of research in the world especially, for example, in February, 1981 " Soviet Union's quantum electronics " (Sov.J.Quantum Electron.11(11), " electron beam control closed circulation system CO Nov.1981) publishes papers ₂The catalytic regeneration of laser gas mixture " (Catalytic regeneration of the gas mixture in an electronbeam-comtrolled closed-cyclc CO ₂Laser) disclose a kind of composite catalyst in, it is by cupric oxide CUo and chrome green Cr ₂O ₃Form, this composite catalyst can suppress CO simultaneously ₂Disassociation and eliminate objectionable impurities NO _XStockpile, but, this CO ₂Laser instrument still need adopt bypath system, and the catalytic regeneration temperature of laser instrument is up to 600 ℃, and equipment is too fat to move, and sealing property is bad, and operating temperature is too high, suppresses CO simultaneously ₂Disassociation and eliminate NO _XEffect, also unsatisfactory.

According to the shortcoming that above-mentioned prior art exists, the purpose of this invention is to provide and have inhibition CO under a kind of normal temperature condition simultaneously ₂Active medium CO in the laser instrument ₂Disassociation and elimination NO _XThe composite catalyst and the device thereof of accumulation dual-use function.

For achieving the above object, the present invention takes following technique measures; The normal temperature composite catalyst is with Metal Palladium P _dOr P _tPlatinum mixes in many graininess carbon fiber, by 1 in 01-5% ratio diffusion: 1-1: the 50(mass ratio) proportioning and silica alumina ratio are that the particulate zeolite of 5-20 is mixed with the graininess composite catalyst that granularity is the 1-10 millimeter.Described zeolite needs through ion-exchange treatment, at CO before the preparation moulding ₂When using this normal temperature composite catalyst in the laser instrument, it is placed in a kind of special catalytic unit, its structure as shown in Figure 1 and Figure 2, it is made up of metal shell, screen pack two parts.The shape of metal shell is decided to adapt to employed laser gas circulation closed-loop path flow channel shape, for example, if flow channel cross-section is shaped as circular, then metal shell is made cylindrical, if flow channel cross-section is shaped as rectangle, then metal shell is made the box-like shape that cross section is a rectangle, can be fixed in the runner.Described screen pack is to be made of more than one woven wire interlayer, and is middle separated by a distance, and parallel placing in the metal shell established the position of screw secure wire mesh in metal shell around the metal shell, is a kind of movable structure.It can play loose fixing composite catalyst of the present invention and make it not vibrate to come off.According to laser gas circulation power Flow Field Distribution and flow resistance test, the catalytic unit cross-sectional sizes is determined in design, riding position, can be by controlling catalyst loosening degree and woven wire interlayer number and every thickness of interlayer and the required gas flow rate of spacing control catalyst that filter screen woven wire interlayer is fixed, this catalytic regeneration device can be single or several are fixed in the different parts of gas circulation runner in the laser instrument, both utilized the major cycle aerodynamic force, do not influenced the gas circulation uniformity again to be implemented in CO ₂Laser instrument inside is (10 ℃-40 ℃) catalytic regeneration CO under normal temperature condition ₂With elimination NO _X, make CO ₂Laser instrument operation steady in a long-term.

The present invention has the following advantages: (one) composite catalyst can be realized the CO in the regeneration active medium under normal temperature condition ₂And eliminate NO simultaneously _XThe effect of accumulation, (2) this catalyst is difficult for poisoning, rises the dust pollution Optical Maser System, can also adsorb Trace Water Vapor, (3) composite catalyst can be regenerated, (4) the composite catalyst cost is low, (5) use compound this catalyst of normal temperature and device thereof to need not to change former laser structure, use easy to maintenancely, be applicable to the various closed circulation CO that flows ₂Laser instrument, particularly high power CO ₂Laser instrument, (six) can realize the active medium ingredient stability, laser instrument operation steady in a long-term.

Fig. 1 is the A-A cutaway view of Fig. 2

Fig. 2 is a normal temperature composite catalyzing installation drawing

The invention will be further described below in conjunction with accompanying drawing.When utilizing normal temperature composite catalyzing of the present invention agent and device thereof to be used for " 2 kilowatts of carbon dioxide of the continuous lasers of the totally-enclosed crossing current of HGL-84 type ", used normal temperature composite catalyst consists of Metal Palladium P_dIn the 05%(mass ratio) ratio diffusion mix in the porous prilled carbon fiber, by 1: the 10(mass ratio) proportioning and silica alumina ratio are that about 10 particulate zeolite is mixed with the graininess composite catalyst that granularity is the 5-7 millimeter.Screen pack is made of two woven wire interlayers, the silk screen thickness of interlayer is 10 millimeters, the distance of two silk screen thickness of interlayer is 15 millimeters, metal shell is shaped as the box-packed (length * wide * thick=800mm * 400mm * 400mm) of rectangle, as shown in Figure 1, by the 1 usefulness screw of the flange screw on the metal shell 5 this catalytic unit is fixed in the carbon dioxide laser gas runner, woven wire interlayer 2 is housed in the metal shell 5, with loose fixing composite catalyst 3 of the present invention, the position of woven wire interlayer 2 in metal shell 5 is fixing by screw 4 by screw, and metal shell and runner are screwed by flange screw 1.Show by Saltzmamn method analyzing and testing that through 103 type gas phase analyzers and 72 type spectrophotometers this catalyst and device thereof can make CO ₂Resolution ratio drops to less than 5% NO by original 20% _XAccumulation drop to zero by original hundreds of PPM orders of magnitude, effective sealing time that laser instrument is once inflated is from bringing up to 200 hours less than 100 hours, continuous operation was brought up to 40 hours by original 12 hours, accumulative total work was brought up to more than 60 hours by original 30 hours, and the laser output power stability has reached 2KW ± 2%, and the hot spot geometry and the pattern of light beam are constant substantially.

Claims (2)

1, a kind of carbon dioxide CO that is used for simultaneously ₂Regeneration and elimination nitrogen oxide NO _xComposite catalyst, it is characterized by it by Metal Palladium P _aOr platinum P _tMix in the porous prilled carbon fiber in 0.1-5% ratio (mass ratio) diffusion, by 1: 1-1: 50 (mass ratioes), proportioning and silica alumina ratio be the graininess of 5-20 through the formulated graininess of the zeolite of ion-exchange treatment, granularity is the 1-10 millimeter.

2, a kind of catalytic unit that uses the described catalyst of claim 1, it is characterized by it is made up of metal shell and screen pack two parts, metal shell (5) is the cylinder or the box-like body of circle or rectangle for cross section, metal shell (5) is used screw attachment with runner by metal shell body flange screw (1), described screen pack is made of more than one woven wire interlayer (2), middle separated by a distance, parallel placing in the metal shell, be screwed the position by the screw on the metal shell body (4), woven wire interlayer (2) is with loose fixing composite catalyst of the present invention (3).

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