Palladium-on-carbon base nano-catalyst for producing hydrogen gas by direct decomposition of methanoic acid and method for producing the same

A nano-catalyst, carbon-supported palladium technology, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve the problems of restricting practical application, high operating temperature, potential danger, etc., achieving great application potential, strong resistance to CO Effects of Poisoned Ability

Inactive Publication Date: 2008-07-16
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods more or less have problems such as high operating temperature, low efficiency, heavy equipment, high concentration of CO, high price, and potential danger, which seriously restrict the practical application of these methods.

Method used

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  • Palladium-on-carbon base nano-catalyst for producing hydrogen gas by direct decomposition of methanoic acid and method for producing the same
  • Palladium-on-carbon base nano-catalyst for producing hydrogen gas by direct decomposition of methanoic acid and method for producing the same
  • Palladium-on-carbon base nano-catalyst for producing hydrogen gas by direct decomposition of methanoic acid and method for producing the same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]The catalyzer that above-mentioned obtains is placed in gas generator, at 92 ℃ catalytic decomposition formic acid, used catalyzer is Pd-Au / C, Pd-Ag / C, Pd / C (20wt%Pd, n Pd : n Me =3:1, Me=Ag and Au), the solution used is 5.00ml of aqueous solution containing 9.94mol / L formic acid and 3.33mol / L sodium formate. The rate at which the catalyst catalyzes the decomposition of formic acid is obtained by measuring the gas produced by the reaction. The entire reaction proceeded as shown in Figure 2 within 2 hours.

[0035] It can be seen from the figure that the alloy catalyst containing gold has the highest initial activity and sustained activity, and the activity of the catalyst containing silver is a little weaker than that containing gold, but it is still higher. Catalysts of pure palladium quickly lose their activity for the decomposition of formic acid. Therefore, the addition of gold and silver elements plays a key role in maintaining the activity of the palladium catal...

Embodiment 2

[0037] The effect of the ratio of formate and formic acid on the decomposition rate of formic acid and the concentration of carbon monoxide in reformed gas was investigated. The catalyst used in the experiment is 30mg Pd-Ag / C (20wt%Pd, n Pd : n Ag =3:1), the operating temperature is 92°C. The solution used was 5.00 ml of an aqueous solution containing 9.94 mol / L formic acid and 3.33 mol / L sodium formate. The rate at which the catalyst catalyzes the decomposition of formic acid is obtained by measuring the gas produced by the reaction. The entire reaction proceeded as shown in Figure 3 within 2 hours.

[0038] It can be seen from the figure that the decomposition rate of formic acid and the concentration of carbon monoxide in the reformed gas increase first and then decrease with the increase of formate concentration. It is worth noting that when the decomposition rate of formic acid is at its maximum, the carbon monoxide concentration in the reformed gas has exceeded the m...

Embodiment 3

[0040] The influence of the content of silver in the catalyst on the decomposition rate of formic acid was investigated. The catalyst used in the experiment is 30mg Pd-Ag / C (20wt%Pd, n Pd : n Ag =3:0.5, 3:1, 3:2, 3:3, 3:4, 3:6, 3:9), the operating temperature is 92°C. The solution used was 5.00 ml of an aqueous solution containing 9.94 mol / L formic acid and 3.33 mol / L sodium formate. The rate at which the catalyst catalyzes the decomposition of formic acid is obtained by measuring the gas produced by the reaction. The whole reaction proceeded as shown in Figure 4 within 2 hours.

[0041] It can be seen from the figure that in n Pd : n Ag =3:3, the speed of formic acid decomposition is the largest. Adding too much or too little silver is unfavorable to the activity of the catalyst.

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Abstract

The invention relates to a preparation method of a carbon-carrier Pd-based nano catalyst that used for hydrogen preparation from the direct decomposition of formic acid. A solution of soluble palladium compound and other soluble metal compounds is added with strong reducer to obtain a Pd-based nano catalyst; these Pd-based nano catalysts can be dispersed to activated carbon to prepare the carbon-carrier Pd-based nano catalyst, and then added with rare earth oxide or rare earth hydroxide to improve the activity of the Pd-based nano catalyst. The so prepared carbon-carrier Pd-based nano catalyst has quite a high activity in catalyzing the decomposition of formic acid and high selectivity; apart from hydrogen and carbon dioxide, the content of other gases in the obtained gas is very low, the obtained gas can provide material for the field that needs hydrogen or carbon dioxide, hydrogen fuel for fueled batteries, and supports the practical applications of hydrogen fueled batteries.

Description

technical field [0001] The invention belongs to the field of storage and production of hydrogen, and relates to a carbon-supported palladium-based nano-catalyst for directly decomposing formic acid to produce hydrogen and a preparation method thereof. Background technique [0002] As a highly chemically active and widely used substance, hydrogen has many important uses in the fields of national production and scientific research. Hydrogen is an excellent reducing agent, which can react quickly and cleanly during the chemical reduction reaction. In addition, as people pay more and more attention to the fuel cell, a clean energy conversion device, the fuel problem of the fuel cell becomes more and more prominent. Compared with organic small molecule fuels such as methanol, ethanol and ethylene glycol, hydrogen is a highly active, highly efficient and clean fuel, which has attracted the attention of researchers all over the world. However, so far, there is no efficient, cheap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63C01B3/26
Inventor 邢巍周小春黄云杰廖建辉刘长鹏
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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