Method for preparing iron-based chrome-free high-temperature water gas conversion catalyst in hydrogen-rich atmosphere

A technology for transforming catalysts and hydrogen-rich atmospheres, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. Sintering and other problems, to achieve the effect of wide activation temperature, good thermal stability and high catalytic activity

Inactive Publication Date: 2012-03-28
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The active component of iron-based catalysts is Fe 3 o 4 , by Fe alone 3 o 4 When used as a catalyst, it has the disadvantages of narrow active temperature range, easy sintering, easy poisoning and carbon deposition.

Method used

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  • Method for preparing iron-based chrome-free high-temperature water gas conversion catalyst in hydrogen-rich atmosphere
  • Method for preparing iron-based chrome-free high-temperature water gas conversion catalyst in hydrogen-rich atmosphere
  • Method for preparing iron-based chrome-free high-temperature water gas conversion catalyst in hydrogen-rich atmosphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: According to molar ratio n(Fe):n(Al):n(Ce)=10:1:0.5, weigh 50.6g Fe(NO 3 ) 3 9H 2 O, 4.7gAl(NO 3 ) 3 9H 2 O and 2.7g Ce(NO 3 ) 3 ·6H 2 O, dissolved in 550 mL deionized water. At the same time, 20 g of NaOH was weighed and dissolved in 180 mL of deionized water, and the metal salt solution and the precipitating agent were co-precipitated at room temperature, and the pH of the solution was kept at 9 during the precipitation process. After the precipitation is completed, treat at a constant temperature of 60°C for 5 hours, filter the obtained precipitate, wash with deionized water until the filtrate is neutral, dry at 110°C for 12 hours, grind it into powder, and roast it in a muffle furnace at 400°C After 3 hours, it was extruded under a pressure of 25 kN, crushed and sieved to obtain 20-40 mesh catalyst particles. That is, Fe-Al-Ce catalyst.

Embodiment 2

[0018] Embodiment 2: According to molar ratio n (Fe): n (Al): n (Bi)=10: 2: 1, take by weighing 50.6g Fe (NO 3 ) 3 9H 2 O, 9.4gAl(NO 3 ) 3 9H 2 O and 6.1g Bi(NO 3 ) 3 ·5H 2 O, dissolved in 600 mL deionized water. At the same time, 25g KOH was weighed and dissolved in 230mL deionized water, and the metal salt solution and the precipitating agent were co-precipitated at room temperature, and the pH value of the solution was kept at 9 during the precipitation process. The following process was the same as in Example 1; finally obtained Fe-Al-Bi catalyst.

Embodiment 3

[0019] Embodiment 3: According to molar ratio n (Fe): n (Al): n (Zr)=1: 1: 1, weigh 50.6g Fe (NO 3 ) 3 9H 2 O, 47.0gAl(NO 3 ) 3 9H 2 O and 53.8g Zr(NO 3 ) 4 ·5H 2 O, dissolved in 1350 mL deionized water. At the same time, weigh 36g Na 2 CO 3 Dissolve in 330mL deionized water, and co-precipitate the metal salt solution and the precipitating agent at room temperature, and keep the pH value of the solution at 9 during the precipitation process. The following process is the same as in Example 1; the Fe-Al-Zr catalyst is finally obtained .

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Abstract

The invention relates to a method for preparing an iron-based chrome-free high-temperature water gas conversion catalyst in a hydrogen-rich atmosphere, which belongs to the technical field of water gas conversion catalysts. The iron-based chrome-free water gas conversion catalyst consists of oxides of iron, aluminum and M, wherein the M is one or two of cerium, bismuth, zirconium, lanthanum and yttrium; the mole ratio of the iron to the aluminum is 10:14 to 1:1; the mole ratio of the iron to the M is 20:1 to 1:1; and when the M are two elements, the mole ratio of the two elements is 0.5 to 2.The catalyst prepared by adopting the method has the advantages of high catalytic activity, wide activity temperature, high heat stability, environmental protection, no chrome hazard and the like, and the catalyst is an effective CO conversion catalyst; and when the catalyst is adopted in an atmospheric fixed-bed reactor to perform water gas conversion reaction in the hydrogen-rich atmosphere (VHis more than or equal to 72 percent), the CO conversion rate can reach 75 to 85 percent at the temperature of between 350 to 600 DEG C.

Description

technical field [0001] The invention relates to a preparation method of an iron-based chromium-free high-temperature water-gas shift catalyst used in a hydrogen-rich atmosphere, and belongs to the technical field of water-gas shift catalysts. Background technique [0002] Hydrogen energy is recognized as an efficient and clean energy in the world, and it is the most promising alternative to fossil energy in the future. However, the first problem to be overcome in order to use hydrogen as an energy source for the benefit of mankind is the production of a large amount of cheap hydrogen. At present, the mature methods that can be used for large-scale hydrogen production in the world are mainly electrolysis of water and hydrogen production from fossil energy, but the former consumes more energy than the latter, resulting in high hydrogen production costs. A large amount of crude coke oven gas produced in the coking process of iron and steel enterprises or coking plants is purif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01J23/745C01B3/16
CPCY02P20/52
Inventor 李谦鲍正洪付威贾钰丁伟中
Owner SHANGHAI UNIV
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