WO2004022224A1 - 硫黄化合物除去用吸着剤、水素の製造方法及び燃料電池システム - Google Patents
硫黄化合物除去用吸着剤、水素の製造方法及び燃料電池システム Download PDFInfo
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- WO2004022224A1 WO2004022224A1 PCT/JP2003/010781 JP0310781W WO2004022224A1 WO 2004022224 A1 WO2004022224 A1 WO 2004022224A1 JP 0310781 W JP0310781 W JP 0310781W WO 2004022224 A1 WO2004022224 A1 WO 2004022224A1
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- Prior art keywords
- adsorbent
- sulfur compounds
- hydrogen
- temperature
- removing sulfur
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Definitions
- the present invention relates to an adsorbent for removing sulfur compounds, a method for producing hydrogen, and a fuel cell system. More specifically, sulfur capable of efficiently removing various sulfur compounds in a hydrocarbon fuel to a low concentration even at room temperature.
- Known types of fuel cells include phosphoric acid type, molten carbonate type, solid oxide type, and solid polymer type depending on the type of electrolyte used.
- hydrogen sources include liquefied natural gas mainly composed of methanol and methane; city gas mainly composed of natural gas; synthetic liquid fuel derived from natural gas; and LPG, naphtha, kerosene, etc. The use of petroleum hydrocarbons is being studied.
- a method of treating the hydrocarbon by partial oxidation reforming, autothermal reforming or steam reforming in the presence of a reforming catalyst is used.
- adsorbents that adsorb and remove sulfur compounds in hydrocarbon fuels such as LPG and city gas are known. However, some of these adsorbents show high desulfurization performance at about 150 to 30 o ° c, but the desulfurization performance at room temperature is not always satisfactory. It was actual.
- a desulfurizing agent in which Ag, Cu, Zn, Fe, Co, Ni, and the like are supported on a hydrophobic zeolite by ion exchange see, for example, JP-A-2001-286753
- a desulfurizing agent in which Ag or Cu is supported on Y-type zeolite, 0-type zeolite or X-type zeolite see, for example, Japanese Patent Application Laid-Open No. 2011-305123.
- these desulfurizing agents can efficiently adsorb and remove mercaptans and sulfides at room temperature, they hardly adsorb carbonyl sulfide.
- a copper-zinc based desulfurizing agent is disclosed (for example, see JP-A-2-302).
- This desulfurizing agent can adsorb and remove various sulfur compounds at a temperature of 150 ° C or higher, but has a low adsorption performance for sulfur compounds at a low temperature of 100 ° C or lower.
- a desulfurizing agent in which copper is supported on a porous carrier such as alumina has been disclosed (for example, refer to Japanese Patent Application Laid-Open No. 2001-123188). Although this desulfurizing agent is said to be usable at a temperature of 100 ° C or less, its adsorption performance is not sufficiently satisfactory. Disclosure of the invention
- the present invention provides an adsorbent for sulfur compound removal capable of efficiently removing various sulfur compounds in a hydrocarbon fuel to a low concentration even at room temperature, and a desulfurized carbonaceous material using the adsorbent.
- An object of the present invention is to provide a method for effectively producing hydrogen that can be used for a fuel cell from a hydrogen fuel, and a fuel cell system using the hydrogen obtained by the method.
- cerium oxide particularly those having an average crystallite diameter of 10 nm or less have excellent ability to adsorb various sulfur compounds even at room temperature. It has been found that hydrogen that can be used for fuel cells can be effectively obtained by reforming hydrocarbon fuel desulfurized using this adsorbent. The present invention has been completed based on such knowledge.
- an adsorbent for removing sulfur compounds in a hydrocarbon fuel which comprises cell oxide
- the supported amount of the compound of at least one element selected from the elements belonging to Groups 1 to 15 of the periodic table is 1 to 90 mass based on the total amount of the adsorbent as the element. /.
- cerium oxide is a composite oxide containing at least one metal element selected from elements belonging to Groups 2 to 16 of the periodic table other than cerium and cerium.
- Adsorbent for compound removal
- the hydrocarbon fuel is at least one type of carbon selected from LPG, city gas, natural gas, naphtha, kerosene, gas oil or ethane, ethylene, propane, propylene, butane, butene, methanol and dimethyl ether.
- the adsorbent for removing a sulfur compound according to the above (1) which is a hydrogen compound or an oxygen-containing hydrocarbon compound;
- the desulfurized fuel is subjected to a partial oxidation reforming catalyst, an auto-thermal reforming catalyst or a steam reforming catalyst.
- a method for producing hydrogen which is brought into contact with
- Figure 1 is a best mode for carrying out the t invention is a schematic flow diagram illustrating an example of a fuel cell system of the present invention
- the adsorbent for removing sulfur compounds of the present invention contains cerium oxide and is used for removing various sulfur compounds in hydrocarbon fuel.
- sulfur compounds examples include carbonyl sulfide, carbon disulfide, hydrogen sulfide, simple sulfur, sulfur dioxide, mercaptans, sulfides, and thiophenes.
- adsorbent of the present invention there is no particular limitation on the form of cerium oxide contained therein, and examples thereof include the following adsorbents.
- ce-M composite oxide An adsorbent containing a composite oxide containing an element other than cerium oxide or cerium (hereinafter referred to as “ce-M composite oxide”) alone.
- Adsorbents containing active metal species supported on a carrier consisting of cell oxide or CeM complex oxide and other metal oxides.
- Examples of the element other than the ceramic constituting the Ce-M composite oxide include at least one kind of metal element selected from the elements belonging to Groups 2 to 16 of the periodic table.
- Examples of such Ce—M complex oxides include Ce—Si complex oxides, Ce—Zr complex oxides, and Ce—Si—Zr complex oxides. Can be.
- the other metal oxide used in combination with the cerium oxide or the Ce—M composite oxide includes, for example, La, Sc, Y, Nd, Pr, An oxide of a metal selected from Sm, Gd and Yb is preferably exemplified. These metal oxides may be used alone or in combination of two or more.
- the active metal species supported on the carrier may be an element selected from the elements belonging to Groups 1 to 15 of the periodic table, for example, Cs, Ba, Yb , Ti, Zr, Hf, Nb, Mo, W, Mn, Re, Fe ⁇ Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag , Au, Zn, Ga, In, Sn, Bi and the like can be used. These may be supported alone or in a combination of two or more.
- the states of these elements are not particularly limited, such as oxides and metals. Preferred of these elements are Ag, Cu, Ni, Fe, Mn, etc., depending on the type and amount of the sulfur compound in the hydrocarbon fuel.
- Such an active metal species can be obtained by being supported on a carrier composed of cerium oxide or Ce-M composite oxide, or a carrier composed of cerium oxide or Ce-M composite oxide and another metal oxide.
- the desulfurization performance of the adsorbent can be improved.
- the loading amount of the active metal species is not particularly limited, but is usually selected in the range of 1 to 90% by mass, preferably 3 to 80% by mass based on the total amount of the element and the carrier.
- the refractory porous carrier may be at least one selected from the group consisting of silica, alumina, silica-alumina, titania, zirconia, zeolite, magnesia, diatomaceous earth, clay and clay.
- silica alumina
- silica-alumina titania
- zirconia zeolite
- magnesia magnesia
- diatomaceous earth clay and clay.
- An adsorbent in which cerium oxide or Ce-M composite oxide is supported on these refractory porous carriers can also be preferably used.
- the content of cerium oxide depends on the desulfurization performance. Is preferably 3% by mass or more, more preferably 10% by mass or more.
- Cerium oxide in the adsorbent has an average crystallite diameter of 10 nm or less, preferably 1 to 10 nm, and is preferable from the viewpoint of desulfurization performance.
- the average crystallite size of the cerium oxide can be controlled when preparing the adsorbent.
- the average crystallite diameter of cerium oxide in the adsorbent is a particle diameter measured by a transmission electron microscope.
- Particles do not necessarily have to be crystalline, and refer to the particle size of primary particles, whether crystalline or amorphous.
- the primary particles referred to here are particles that are not aggregated or particles that are a unit of an aggregate. Even when the particles aggregate to form secondary particles, tertiary particles, and the like, the average crystallite diameter of cerium oxide refers to the particle diameter of the primary particles.
- the average value of the particle sizes is determined, this is used as the average crystallite size, and the particle shape is rod-like or In the case of a needle shape, the width of the particle is used as the particle diameter, not the length.
- the average crystallite size of Ce 2 O refers to the primary particle size of cerium oxide supported, and also forms a solid solution with other oxides. In this case, it refers to the primary particle size of the solid solution particles containing cerium. In the measurement using a transmission electron microscope as described above, when the boundaries of the particles are clearly observed, the measurement can be performed using an automatic counter or the like.
- the cerium oxide preferably has a hydrogen consumption of 200 / mol / g or more at a temperature of 600 ° C. or less in a temperature-reduced reduction (TPR) test. More preferably, it is not less than 00 ⁇ mol / g.
- TPR temperature-reduced reduction
- a sample of 100 nig was used, and argon gas containing 10% by volume of hydrogen was introduced at 20 milliliters / min. The temperature is raised to 827 ° C at a rate of ° C / min, and the hydrogen consumption at a temperature of 600 ° C or less is determined.
- the adsorbent of the present invention preferably has a specific surface area of 2 Om 2 / g or more, more preferably 50 m 2 / g or more, from the viewpoint of desulfurization performance.
- the specific surface area of the adsorbent can be measured, for example, using a specific surface area measuring device manufactured by urea ionitas as follows.
- a sample tube was filled with about 10 Omg of the sample, and heated and dehydrated in a nitrogen stream at 200 ° C for 20 minutes as a pretreatment.
- a nitrogen (30%) nohelium (70%) mixed gas was passed through at a liquid nitrogen temperature to adsorb nitrogen, then desorbed, and the specific surface area was determined from the amount of nitrogen adsorbed measured by a TCD detector.
- an aqueous solution containing a cerium source specifically a cerium nitrate
- an aqueous solution of aluminum oxide to precipitate the adsorbent.
- the precipitate is filtered, washed with water, dried at a temperature of about 50 to 200 ° C, then calcined at a temperature of about 250 to 500 ° C, and then tableted and extruded. What is necessary is just to shape
- a conventionally known method for example, a pore filling method, an immersion method, and an evaporation to dryness method can be used.
- the drying temperature is usually about 50 to 200 ° C
- the firing temperature is usually about 250 to 500 ° C.
- the drying temperature is usually about 50 to 200 ° C, and the firing temperature is preferably 400 ° C or less, and more preferably 100 to 400 ° C.
- the hydrocarbon fuel is, for example, at least one hydrocarbon compound selected from LPG, city gas, natural gas, naphtha, kerosene, gas oil or ethane, ethylene, propane, propylene, butane and butene.
- an oxygen-containing hydrocarbon compound can be exemplified.
- examples of the oxygen-containing hydrocarbon compound include at least one selected from anolecols such as methanol, ethanol, and isopropanol monoether, and ethers such as dimethinoleether and methinoleethyl ether. Of these, dimethyl ether is particularly preferred.
- the concentration of the sulfur compound in the hydrocarbon fuel-containing gas to which the adsorbent of the present invention is applied is preferably from 0.001 to 10,000 volume p, particularly preferably from 0.1 to 100 volume ppm.
- the temperature is usually selected in the range of 150 to 200 ° C, and the GHSV (gas hourly space velocity) is selected in the range of 100 to 1,000,000 h- 1 .
- the desulfurization temperature exceeds 200 ° C, adsorption of sulfur compounds becomes difficult to occur.
- the preferred temperature is in the range of 150 to: 120 ° (:, more preferably in the range of 120 to: L 00 ° C.
- the preferred GHSV is from 100 to; LOO, OOO h— Ri is preferably 1 0 0-5 0 0 0 0 the range of h 1.
- the desulfurization performance may be improved depending on the type of metal to be supported, but is not required in the catalyst of the present invention.
- the addition of oxygen should be avoided as it may involve the combustion (oxidation) of hydrocarbon fuels.
- the sulfur compound in the hydrocarbon fuel is desulfurized using the adsorbent of the present invention, and then the desulfurized fuel is reformed.
- a reforming method a method such as partial oxidation reforming, autothermal reforming, and steam reforming can be used.
- the concentration of the sulfur compound in the desulfurized hydrocarbon fuel is preferably 0.1 vol ppm or less, particularly preferably 0.05 vol ppm or less, from the viewpoint of the life of each reforming catalyst.
- the partial oxidation reforming is a method for producing hydrogen by a partial oxidation reaction of hydrocarbons.
- the reaction pressure is normal pressure to 5 MPa, and the reaction temperature is 400 to 1.1. 00 ° C, GH SV 1, 00 0 ⁇ :. 1 00, 00 0 ⁇ oxygen (0 2) / carbon ratio from 0.2 to 0 in 8 conditions Ru reforming reaction takes place.
- Autothermal reforming is a method in which partial oxidation reforming and steam reforming are combined, and usually in the presence of an autothermal reforming catalyst, usually at a reaction pressure of normal pressure to 5 MPa and a reaction temperature of 400 to 400 MPa.
- a reforming reaction is performed.
- steam reforming is a method for producing hydrogen by bringing steam into contact with hydrocarbons.
- the reaction pressure is normal pressure to 3 MPa, and the reaction temperature is 200 to 900. ° C, the steam / carbon ratio 1. 5 ⁇ 1 0, GHS VI, 0 0 0 ⁇ : reforming reaction is carried out in L 0 0, 0 0 0 h 1 condition.
- the partial oxidation reforming catalyst, the autothermal reforming catalyst, and the steam reforming catalyst can be appropriately selected from conventionally known catalysts. Catalysts are preferred.
- a carrier for these catalysts a carrier containing at least one selected from manganese oxide, cerium oxide and zirconium can be preferably exemplified.
- the carrier may be a carrier consisting of only these metal oxides, or a carrier obtained by incorporating the above metal oxide into another refractory porous inorganic oxide such as alumina. .
- the present invention also provides a fuel cell system using hydrogen obtained by the production method.
- the fuel cell system of the present invention will be described with reference to FIG. ,
- FIG. 1 is a schematic flow chart showing one example of the fuel cell system of the present invention.
- the fuel in the fuel tank 21 flows into the desulfurizer 23 via the fuel pump 22.
- the desulfurizer can be filled with the adsorbent of the present invention.
- the fuel desulfurized in the desulfurizer 23 is mixed with water from the water tank through the water pump 24, then introduced into the vaporizer 1 and vaporized, and then mixed with the air sent from the air blower 135. And sent to the reformer 31.
- the inside of the reformer 31 is filled with the above-mentioned reforming catalyst, and the fuel mixture sent to the reformer 31 (water vapor, oxygen and a mixed gas containing a hydrocarbon fuel or an oxygen-containing hydrocarbon fuel) is used. ), Hydrogen or synthesis gas is produced by any of the reforming reactions described above.
- the hydrogen or synthesis gas produced in this way is reduced through the CO converter 32 and the CO selective oxidizer 33 to such an extent that the CO concentration does not affect the characteristics of the fuel cell.
- catalysts used in these reactors include: CO converter 32, iron-chromium catalyst, copper-zinc catalyst or noble metal catalyst ICO selective oxidation furnace 33, ruthenium catalyst, platinum catalyst Or that Examples thereof include mixtures thereof.
- the fuel cell 34 is a polymer electrolyte fuel cell having a polymer electrolyte 34 C between a negative electrode 34 A and a positive electrode 34 B.
- the hydrogen rich gas obtained by the above-described method is applied to the negative electrode side, and the air sent from the air blower 135 is applied to the positive electrode side. (Not shown). .
- a platinum black, activated carbon-supported Pt catalyst or Pt_Ru alloy catalyst is used for the negative electrode, and a platinum black, activated carbon-supported Pt catalyst or the like is used for the positive electrode.
- the remaining hydrogen can be used as fuel by connecting the parner 31 A of the reformer 31 to the negative electrode 34 A side.
- a water / water separator 36 connected to the positive electrode 34 B side, water and exhaust gas generated by the combination of oxygen and hydrogen in the air supplied to the positive electrode 34 B side are separated. However, water can be used to generate steam.
- an exhaust heat recovery device 37 can be provided to recover the heat and use it effectively.
- the waste heat recovery unit 37 has a heat exchanger 37 A for removing the heat generated during the reaction, a heat exchanger 37 B for exchanging the heat taken by the heat exchanger 37 A with water, and cooling. And a pump 37D for circulating the refrigerant to the heat exchangers 37A and 37B and the cooler 37C, and the hot water obtained in the heat exchanger 37B is It can be used effectively in facilities such as
- the average crystallite size of cerium oxide in the obtained desulfurizing agent and TPR test H 2 consumption (less than 600 ° C) and the specific surface area of the desulfurizing agent were measured according to the method described in the specification.
- Cellium nitrate hexahydrate [special grade reagent, manufactured by Wako Pure Chemical Industries, Ltd.] A solution obtained by dissolving 470 g in 1 L of ion-exchanged water heated to 50 ° C, and 3 mol / L An aqueous solution of NaOH at a concentration was dropped and mixed so that the pH of the mixture was maintained at 13, and the mixture was stirred for 1 hour while maintaining the temperature at 50 ° C.
- Cerium nitrate ⁇ Hexahydrate [Special grade reagent, manufactured by Wako Pure Chemical Industries, Ltd.] A solution obtained by dissolving 470 g in 1 L of ion-exchanged water heated to 50 ° C, and 30% by mass Aqueous ammonia at a concentration was dropped and mixed so that the pH of the mixture was maintained at 12, and the mixture was stirred for 1 hour while maintaining the temperature at 50 ° C.
- the product is dried for 12 hours in a 110 ° C blast dryer, and further at 350 ° C. It was baked for 3 hours. Thereafter, the mixture was subjected to tableting and pulverization to obtain a desulfurizing agent composed of Ce 2 (B) having a particle size of 0.5 to 1.0 mm. Table 1 shows the properties of this desulfurizing agent.
- Example 2 The Ce 2 (B) obtained in Example 2 was placed in a Matsufuru furnace and calcined at 800 ° C. for 6 hours to obtain a desulfurizing agent composed of Ce 2 (C). Table 1 shows the properties of this desulfurizing agent.
- Test example 1 Each of the desulfurizing agents obtained in Examples 1 to 4 and Comparative Examples 1 to 6 was molded into 0.5 to 1 mm, respectively, and 1 cm 3 of the desulfurizing agent was filled in a desulfurization tube having an inner diameter of 9 mm.
- the desulfurizing agent temperature was 20 ° C, and COS, dimethylsulfide (DMS), t-butynolemercaptan (TBM) and dimethyldisulfide (DMDS) were each 10 V o 1 ppm (the total 40 vo 1 pm) propane gas, under normal pressure, GH SV (gas hourly space velocity) 3 0, 0 0 0 h was passed through one of the conditions (of each sulfur compound concentration in the desulfurization tube outlet gas S CD ( (Sulfur chemiluminescence detector) Measured hourly by gas chromatography Table 2 shows the time when the sulfur compound concentration exceeds 0.1 V o 1 ppm and the total sulfur adsorption. table
- Cerium oxide (A) is impregnated with a metal salt shown in Table 3, dried at 120 ° C, calcined at 400 ° C, and the total amount of metal species shown in Table 3 is reduced. Based on the above, a desulfurizing agent loaded with 10% by mass was obtained.
- a desulfurizing agent comprising 10 mass% of Ag based on the total amount in type 3 zeolite was obtained.
- the CO 2 concentration of the gas at the outlet of the desulfurization tube was measured hourly by SCD (sulfur chemiluminescence detector) gas chromatography.
- Table 3 shows that the CQS concentration is 0.
- Table 3 c shows the time in excess of vo 1 ppm
- Ag was 10 mass based on cerium oxide (A) using silver nitrate solution. / 0 was impregnated and supported, dried (fired) at 120 ° C, and then fired at the temperature shown in Table 4 to obtain a desulfurizing agent.
- the desulfurizing agents of Examples 11 to 15 were molded into 0.5 to 1 mm, and 1 cm 3 of the desulfurizing agent was filled in a desulfurizing tube having an inner diameter of 9 mm.
- DMS dimethyl Chirusarufuai de
- the dimethyl sulfide concentration of the gas at the outlet of the desulfurization tube was measured hourly by SCD (Sulfur Chemiluminescence Detector) gas chromatography.
- Table 4 shows the time when the dimethyl sulfide concentration exceeded 0.1 V o 1 ppm.
- a sulfur compound removing adsorbent capable of efficiently removing sulfur compounds in a hydrocarbon fuel to a low concentration even at room temperature, and a fuel cell desulfurized using the above adsorbent from a fuel cell It is possible to provide a method for effectively producing hydrogen that can be used for use, and a fuel cell system using hydrogen obtained by this method.
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Abstract
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EP03794097A EP1550505A4 (en) | 2002-09-05 | 2003-08-26 | ADSORPTION AGENTS FOR REMOVING SULFUR COMPOUNDS, METHOD FOR PRODUCING HYDROGEN AND FUEL CELL SYSTEM |
AU2003261728A AU2003261728A1 (en) | 2002-09-05 | 2003-08-26 | Adsorbent for removing sulfur compound, process for producing hydrogen and fuel cell system |
CA2497899A CA2497899C (en) | 2002-09-05 | 2003-08-26 | Adsorbent for removing sulfur compound, process for producing hydrogen and fuel cell system |
US10/526,397 US7556872B2 (en) | 2002-09-05 | 2003-08-26 | Adsorbent for removing sulfur compound, process for producing hydrogen and fuel cell system |
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EP1270069B1 (en) * | 2000-03-31 | 2011-06-15 | Idemitsu Kosan Co., Ltd. | Use of a desulfurizing agent |
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US6914033B2 (en) * | 2002-08-13 | 2005-07-05 | Conocophillips Company | Desulfurization and novel compositions for same |
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- 2003-08-26 EP EP03794097A patent/EP1550505A4/en not_active Withdrawn
- 2003-08-26 AU AU2003261728A patent/AU2003261728A1/en not_active Abandoned
- 2003-08-26 US US10/526,397 patent/US7556872B2/en not_active Expired - Fee Related
- 2003-08-26 WO PCT/JP2003/010781 patent/WO2004022224A1/ja active Application Filing
- 2003-08-26 CN CNB038210339A patent/CN100469434C/zh not_active Expired - Fee Related
- 2003-08-26 CA CA2497899A patent/CA2497899C/en not_active Expired - Fee Related
- 2003-08-26 KR KR1020057003716A patent/KR100973876B1/ko not_active IP Right Cessation
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7670987B2 (en) * | 2004-02-19 | 2010-03-02 | Idemitsu Kosan Co., Ltd. | Reforming catalyst for hydrocarbon, method for producing hydrogen using such reforming catalyst, and fuel cell system |
US8343456B2 (en) | 2004-02-19 | 2013-01-01 | Idemitsu Kosan Co., Ltd. | Reforming catalyst for hydrocarbon, method for producing hydrogen using such reforming catalyst, and fuel cell system |
US7575688B2 (en) * | 2004-03-15 | 2009-08-18 | Honeywell International Inc. | Apparatus and method for removing sulfur containing compounds from a post-refinery fuel stream |
WO2006052997A1 (en) | 2004-11-08 | 2006-05-18 | Trustees Of Tufts College | Apparatus and methods for non-regenerative and regenerative hot gas desulfurization |
EP1819420A1 (en) * | 2004-11-08 | 2007-08-22 | Trustees Of Tufts College | Apparatus and methods for non-regenerative and regenerative hot gas desulfurization |
EP1819420A4 (en) * | 2004-11-08 | 2010-01-20 | Tufts College | DEVICE AND METHOD FOR NONREGENERATIVE AND REGENERATIVE HOT GAS SINKING |
US7871459B2 (en) | 2004-11-08 | 2011-01-18 | Trustees Of Tufts College | Apparatus and methods for non-regenerative and regenerative hot gas desulfurization |
AU2005304693B2 (en) * | 2004-11-08 | 2011-06-09 | Trustees Of Tufts College | Apparatus and methods for non-regenerative and regenerative hot gas desulfurization |
US7704383B2 (en) | 2007-10-16 | 2010-04-27 | Honeywell Interational Inc. | Portable fuel desulfurization unit |
RU2448771C1 (ru) * | 2008-03-10 | 2012-04-27 | Нэшнл Инститьют Оф Эдванст Индастриал Сайенс Энд Текнолоджи | Адсорбент десульфуризатор для жидких фаз |
CN110152601A (zh) * | 2018-04-12 | 2019-08-23 | 济南开发区星火科学技术研究院 | 一种用于原油脱硫的石墨烯吸附剂 |
Also Published As
Publication number | Publication date |
---|---|
KR100973876B1 (ko) | 2010-08-03 |
AU2003261728A1 (en) | 2004-03-29 |
CA2497899A1 (en) | 2004-03-18 |
EP1550505A1 (en) | 2005-07-06 |
CN1678390A (zh) | 2005-10-05 |
KR20050057151A (ko) | 2005-06-16 |
US20050271913A1 (en) | 2005-12-08 |
EP1550505A4 (en) | 2008-12-10 |
CA2497899C (en) | 2012-03-06 |
CN100469434C (zh) | 2009-03-18 |
US7556872B2 (en) | 2009-07-07 |
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