Catalyst for preparing CO by reverse water-gas shift method and preparation method thereof

A water-gas shift, catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, carbon monoxide, etc., can solve the problems of harsh synthetic route conditions, high cost, weakened atom economy, etc., and achieve excellent CO activity and selection. properties, enrichment of surface defects, and enhancement of valence band energy levels and electron transport efficiency

Active Publication Date: 2019-11-22
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is well known that due to CH 4 With a relatively stable chemical structure and high C-H bond activation energy, using it as a raw material to prepare alcohols, hydrocarbons and other chemicals is more demanding and expensive than the synthetic route using CO as a raw material, which indirectly weakens the CO 2 Atom economy as carbon source

Method used

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  • Catalyst for preparing CO by reverse water-gas shift method and preparation method thereof
  • Catalyst for preparing CO by reverse water-gas shift method and preparation method thereof
  • Catalyst for preparing CO by reverse water-gas shift method and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A. Weigh 0.36g of palladium chloride and dissolve it in 50ml of deionized water to prepare an active component solution with a concentration of 0.04mol / L; weigh 10g of cerium oxide powder and immerse it in the solution and age it at 25°C for 24h; The final powder was dried in an oven at 120° C. for 10 hours, and then placed in a muffle furnace and calcined at 450-500° C. for 20 hours to obtain catalyst precursor 1 with a palladium mass percentage of 2 wt.%.

[0028] B. Weigh 1.6g of anhydrous cerium chloride and mix it with the catalyst precursor 1 obtained in step A, and then perform mechanical grinding. The molar ratio of anhydrous cerium chloride to cerium oxide in the precursor 1 is 1:3.

[0029] C. Put the mixed powder in a He atmosphere and raise the temperature to 300°C and heat treatment at constant temperature for 3h; then raise the temperature to 500°C at a rate of 2°C / min, and switch the atmosphere to H 2 atmosphere and heat treatment at constant temperature ...

Embodiment 2

[0033] Steps A~C are the same as in Example 1;

[0034] The mass of ammonium iodide added in step D is 33.7g, and the molar ratio of ammonium iodide to the cerium element in the catalyst precursor 2 is 3:1;

[0035] O in step E 2 / N 2 O in the atmosphere 2 The concentration is 20%.

[0036] The I / Pd molar concentration ratio on the catalyst surface was measured to be 0.31. The application performance results are shown in Table 1.

Embodiment 3

[0038] Steps A~D are the same as in Example 1,

[0039] The oxidation-reduction process described in step E is carried out 3 times in a cycle.

[0040] The I / Pd molar concentration ratio on the catalyst surface was measured to be 0.37. The application performance results are shown in Table 1. .

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Abstract

The invention provides a catalyst for preparing CO by a reverse water-gas shift method and a preparation method of the catalyst, the catalyst is represented as Pd-I / CeO2, the mass percentage of Pd is1-4 wt%, and the molar ratio of surface I / Pd is 0.2-0.5. By finely controlling the preparation process of the catalyst, cerium oxide crystal lattices are expanded through chlorine atoms firstly, theniodine atoms are doped into the catalyst, finally, the excessively doped iodine element is removed through the oxidation-reduction cycle process, and the catalyst with the specific structure and performance is obtained. The catalyst is used in a reaction for preparing CO by a reverse water-gas shift method, the conversion rate of CO in a reaction interval of 400-600 DEG C is 26.2-50%, and the selectivity of CO is 97-99%, which are obviously higher than that of existing catalyst.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, the field of coal chemical industry, and the field of carbon-resource recycling, in particular to a catalyst for producing CO by a reverse water-gas shift method and a preparation method thereof. Background technique [0002] Production of CO / H in coal gasification, methane reforming or methanol cracking 2 During the industrialization of syngas, there is often a large amount of CO 2 impurity gas as the main component. This part of impurity gas is generally separated by technical means such as pressure swing adsorption separation and directly discharged into the atmosphere. This will bring a series of severe environmental problems such as the greenhouse effect in the long run. On the other hand, CO 2 Can be regarded as a safe and recyclable carbon source, although in recent years people have 2 Recycling technologies and absorbent materials are increasingly being explored, but are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/13C01B32/40
CPCB01J27/13C01B32/40
Inventor 姚元根乔路阳周张锋宗珊珊崔国静吴娟许东杰
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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