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Method for preparing perovskite type catalyst for methane or methanol recapitalization

A perovskite type, catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. ore complex oxides, etc., to achieve the effect of high catalytic activity and stability, good sulfur resistance, and control of reaction hot spots

Inactive Publication Date: 2008-05-28
HANERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] But so far, no perovskite composite oxide has been found to be used in the hydrogen production process of natural gas steam reforming or methanol oxidation reforming, and there is no preparation method of this catalyst for natural gas or methanol reforming.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] La 0.2 Ce 0.8 CrO 3 Perovskite catalyst, the preparation method is as follows:

[0035] (1) Weigh nitrate and complexing agent according to the target composite oxide ratio, so that La: Ce: Cr=0.2: 0.8: 1, while (La+Ce+Cr): EDTA: citric acid=1: 1: 1;

[0036](2) EDTA and citric acid are mixed and dissolved in ammonia water, and the stoichiometric ratio of acid radical and ammonia water is 1: 1 to obtain a complex solution;

[0037] (3) adding nitrate in the complexing solution, heating and dissolving, stirring, allowing it to cool naturally to room temperature, adding ammoniacal liquor to the complexing solution after cooling, and adjusting the pH to 6;

[0038] (4) Control the temperature in a water bath to 75°C, stir, concentrate the complex solution until a gel is formed; then dry the gel at 120°C for 10 hours;

[0039] (5) The gel roasting procedure is as follows: heat up from room temperature for 1 hour to 400°C and keep for 4 hours; then heat up from 400°C fo...

Embodiment 2

[0042] La 0.2 SM 0.8 CrO 3 Perovskite catalyst, the preparation method is as follows:

[0043] (1) Weigh nitrate and complexing agent according to the target composite oxide ratio, so that La:Sm:Cr=0.2:0.8:1, while (La+Sm+Cr):EDTA:citric acid=1:1: 1;

[0044] (2) EDTA and citric acid are mixed and dissolved in ammonia water, and the stoichiometric ratio of acid radical and ammonia water is 1: 1 to obtain a complex solution;

[0045] (3) Add nitrate to the complexing solution, after heating and dissolving, stir to make it naturally cool to room temperature, add ammoniacal liquor to the complexing solution after cooling, and adjust the pH to be 5;

[0046] (4) Control the temperature in a water bath at 60°C, stir, and concentrate the complex solution until a gel is formed; then dry the gel at 100°C for 36 hours;

[0047] (5) The gel roasting procedure is as follows: heat up from room temperature for 1 hour to 200°C and keep for 2.5 hours; heat up from 200°C for 2 hours to 6...

Embodiment 3

[0049] La 0.2 Ce 0.8 Zn 0.8 Cr 0.2 o 3 Honeycomb ceramic carrier integral catalyst, the preparation method is as follows:

[0050] (1) Weigh nitrate and complexing agent according to the ratio of target composite oxide, so that La: Ce: Zn: Cr=0.2: 0.8: 0.8: 0.2, while (La+Ce+Zn+Cr): EDTA: lemon Acid = 1:1:1;

[0051] (2) EDTA and citric acid are mixed and dissolved in ammonia water, and the stoichiometric ratio of acid radical and ammonia water is 1: 1 to obtain a complex solution;

[0052] (3) Add nitrate to the complexing solution, after heating and dissolving, stir to make it naturally cool to room temperature, add ammoniacal liquor to the complexing solution after cooling, and adjust the pH to be 7;

[0053] (4) Control the temperature in a water bath at 90°C, stir, and concentrate the complex solution until a gel is formed; then dry the gel at 150°C for 24 hours;

[0054] (5) The gel roasting procedure is as follows: heat up from room temperature for 1 hour to 600°...

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PUM

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Abstract

The invention discloses a preparation method of a perovskite catalyst used for reforming methane or methanol, which comprises the following steps: the metal nitrates of A, A', B and B' are added with a complexing agent and heated to dissolute; ammonia regulation solution with pH=5-7 is added; gel is formed after dehydrating in a constant temperature water bath at the temperature of sixty to ninety DEG C; catalyst powders are obtained after the gel is dried and roasted; the general formula of the catalyst composition is A1-xA'XB1-yB'yO3, wherein x is more than or equal to 0 and less than or equal to1,y is more than or equal to 0 and less than or equal to 1, A or A' is La, Ce, Pr, Gd or Sm; B or B' is Cr, Zr, Zn, Ni, Co, Mn, Fe, Ru, Rh, Pt or Pd. The technique of the invention is simple; the cost is low; the catalyst has the high activity and the high stability; the sulfur tolerance is good; the conversion is high; the service life is long; at the same time, the invention has the advantages of being aseismatic, the small resistance and being easy to be replaced, etc. after being coated on a honeycomb structure and is suitable for mass production. The invention belongs to the field of the catalyst reforming the methane or methanol.

Description

technical field [0001] The present invention relates to a preparation method of a perovskite catalyst for reforming methane or methanol, in particular to a preparation method for a perovskite catalyst for hydrogen production by steam reforming of methane or autothermal reforming of methanol Preparation. Background technique [0002] Fuel cells, especially proton exchange membrane fuel cells (PEMFC) are entering the stage of quasi-commercialization. The ideal fuel is pure hydrogen, but so far, the fuel supply of fuel cells is still a bottleneck restricting its commercial application. From fossil fuels, such as methanol, natural gas, dimethyl ether, gasoline, and diesel, hydrogen supply to fuel cells after reforming is considered to be one of the most realistic ways to solve the hydrogen fuel supply of fuel cells. [0003] Natural gas reforming hydrogen production technology includes steam reforming, partial oxidation reforming and autothermal reforming, in which the steam re...

Claims

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Application Information

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IPC IPC(8): B01J23/26B01J23/10H01M4/90
CPCY02E60/50
Inventor 肖钢侯晓峰周帅林崔冰冰
Owner HANERGY TECH
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