Improved catalyzer of methyl hydride catalyzed partially oxidized synthesis gas and method of manufacturing the same

A methane catalytic part and catalyst technology are applied in the field of catalysts containing nickel and precious metals and in the field of catalyst preparation, which can solve the problems of unguaranteed repeatability of catalyst performance, insufficient melting point of rare earths, and reduced specific surface area, etc., and achieve excellent thermal stability, The effect of reducing the specific surface area and improving the conversion rate

Active Publication Date: 2008-01-23
重庆市化工研究院有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

Its defect is that there is no specific requirement for the specific surface of the catalyst, so the repeatability of the catalyst performance is not guaranteed; at the same time, because the melting point of the rare earth is not high enough, part of the rare earth in the micropores will leave the micropores during the reaction. Pores, can not achieve the purpose of reducing the specific surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Weigh 100 grams of γ-Al 2 o 3 , adding 150 grams of chromium nitrate solution, drying at 100-120°C, and then roasting at 800-1200°C to obtain γ-Al 2 o 3 The improved carrier is ready for use, after testing, 3 The specific surface area of ​​the improved carrier is 15.0m 2 / g.

[0026] (2) Weigh 14 grams of γ-Al 2 o 3 To improve the carrier, add 7.2 g Ni(NO 3 ) 2 ·6H 2 O, 5 g Ce(NO 3 ) 3 ·6H 2 O, 0.9 g PtCl 4 The prepared aqueous solution is dried at 100-120°C, and then calcined at 800-1200°C to obtain about 5 grams of catalyst particles. After testing, the specific surface area of ​​the catalyst is 1.2m 2 / g. .

[0027] (3) The prepared catalyst particles are placed in a fixed-bed reactor for producing synthesis gas by catalytic partial oxidation of methane. The reaction conditions are: temperature is 800°C, reaction pressure is 0.2MPa, and space velocity is 3.6×105 hr -1 , the molar ratio of raw materials is: CH 4 :O 2 =2:1. The result of the reac...

Embodiment 2

[0029] (1) Weigh 100 grams of γ-Al 2 o 3 , adding 125 grams of tungstic acid solution, drying at 100-120°C, and then roasting at 800-1200°C to obtain γ-Al 2 o 3 The improved carrier is ready for use, after testing, 3 The specific surface area of ​​the improved carrier is 17.0m 2 / g.

[0030] (2) Weigh 14 grams of γ-Al 2 o 33 To improve the carrier, add 5.2 g Ni(NO 3 ) 2 ·6H 2 O, 2.6 g Co(NO 3 ) 2 , 5.4 g Ce(NO 3 ) 3 ·6H 2 O, 0.7 g Rh(NO 3 ) 3 The prepared aqueous solution is dried at 100-120°C, and then calcined at 800-1200°C to obtain about 5 grams of catalyst particles. After testing, the specific surface area of ​​the catalyst is 2.1m 2 / g.

[0031] (3) The prepared catalyst particles are placed in a fixed-bed reactor for producing synthesis gas by catalytic partial oxidation of methane. The reaction conditions are: temperature is 800°C, reaction pressure is 0.2MPa, and space velocity is 3.6×10 5 hr -1 , the molar ratio of raw materials is: CH 4 :O 2 =2...

Embodiment 3

[0033] 1) Weigh 100 grams of γ-Al 2 o 3 , adding 137 grams of vanadium sulfate solution, drying at 100-120°C, and then roasting at 800-1200°C to obtain γ-Al 2 o 33 The improved carrier is ready for use. After testing, the specific surface area of ​​the improved carrier is 20.0m 2 / g.

[0034] 2) Catalyst prepared by step-by-step impregnation method:

[0035] (1) Weigh 14 grams of γ-Al 2 o 3 To improve the carrier, add 7.5 grams of Ni(NO 3 ) 2 ·6H 2 The aqueous solution of O configuration is dried at 100-120°C, and then roasted at 800-1200°C.

[0036] (2) Add 5.7 grams of Ce(NO to the carrier treated in step (1) 3 ) 3 ·6H 2 The aqueous solution of O configuration is dried at 100-120°C, and then roasted at 800-1200°C.

[0037] (3) the catalyzer that step (2) is made adds 0.5 gram Ru(NO 3 ) 3 The prepared aqueous solution is dried at 100-120°C, and then calcined at 800-1200°C to obtain an improved catalyst for producing synthesis gas by catalytic partial oxidation ...

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Abstract

An improved catalyst of methane catalyzing part oxidizing syngas is provided, the composite is ABCDOx / Gamma-Al2O3, A is one of Rh, Pd, Pt and Ir, the content making blank space as the standard is 0.1 to 1.0wt per cent; B equals to Ni and / or Co, the content making blank space as the standard is 4.0 to 15.0wt per cent; C is one of La, Ce, Sm and Th, the content making blank space as the standard is 2.0 to 8.0wt per cent; D is one or a mixture of more than one in W, V, Mn or Cr, the content making blank space as the standard is 30 to 60wt per cent. The preparation method is that: use salt solution of D with corresponding measurement to soak in the blank carrier, after drying, high temperature roasting process to achieve improved carrier; then adopt nitrate of A,B,C with corresponding measurement to soak in steps total soak on the improved carrier, after drying, high temperature roasting process to produce improve catalyst. The invention is used for producing syngas, the transforming rate of CH4 reaches 96 to 98 per cent, the selectivity of H2 and CO is above 96.0 per cent, H2 / CO equals to 1.9 to 2.2. Under the reaction pressure of 0.1 to 2.0 Mpa, the invention has good catalyzing activity, selectivity and heat stability.

Description

1. Technical field [0001] The invention belongs to catalysts containing metals or metal oxides or hydroxides, in particular to catalysts containing nickel and precious metals for producing synthesis gas from hydrocarbons and a method for preparing the catalysts. 2. Background technology [0002] Methane is the main component of natural gas. In recent years, many countries in the world have paid more and more attention to the reasonable and effective processing and utilization of methane. The indirect conversion and utilization of methane through synthesis gas has become the focus of research and development in countries all over the world. [0003] At present, there are three main methods of producing synthesis gas from methane: steam reforming (SR), autothermal reforming (ATR) and catalytic partial oxidation (CPOX). Steam reforming (SR) is a strong endothermic reaction that requires high temperature and high pressure conditions (reaction conditions are generally 15-30atm, 8...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C01B3/40
CPCY02P20/52
Inventor 安启洪徐邦澄吴渝赵丽颖
Owner 重庆市化工研究院有限公司
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