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Preparation method of lignin-based bimetallic catalyst and application of lignin-based bimetallic catalyst in hydrogen evolution by electrolyzing water

A bimetallic catalyst, lignin-based technology, applied in electrolysis components, electrolysis process, electrodes, etc., can solve the problems of high catalytic efficiency of electrolytic water hydrogen evolution, good catalytic activity of catalyst metal, low catalytic activity, etc., and achieve excellent electrolytic water hydrogen evolution performance effect

Active Publication Date: 2022-08-09
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect or deficiency of low catalytic activity of existing transition metal hydrogen evolution catalysts, and provide a preparation method of lignin-based bimetallic catalysts. efficient

Method used

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  • Preparation method of lignin-based bimetallic catalyst and application of lignin-based bimetallic catalyst in hydrogen evolution by electrolyzing water
  • Preparation method of lignin-based bimetallic catalyst and application of lignin-based bimetallic catalyst in hydrogen evolution by electrolyzing water
  • Preparation method of lignin-based bimetallic catalyst and application of lignin-based bimetallic catalyst in hydrogen evolution by electrolyzing water

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Effect test

Embodiment 1

[0048] A preparation method of a lignin-based bimetallic catalyst, comprising the following steps:

[0049]S1. According to EHL-COOH 0.8g, ammonium molybdate 0.2mol, hexahydrate nickel nitrate 0.1mol, the molar ratio of molybdenum element in molybdenum salt and nickel element in nickel salt is 2:1, weigh the mass of each substance. Dissolve EHL-COOH in 30 mL of deionized water, then dissolve ammonium molybdate and nickel nitrate hexahydrate in the EHL-COOH aqueous solution step by step, stir for 10 min, and measure the pH of the mixed solution. Adjust the pH of the mixed solution to 9 with ammonia water and hydrochloric acid, stir for 4 hours, perform hydrothermal reaction at 180°C for 6 hours, centrifugal filter and wash the precipitate, place the sample in an oven to dry for 24 hours, take out, and weigh to obtain molybdenum nickel oxide - Carboxylated lignin complex.

[0050] S2. The above molybdenum-nickel oxide-carboxylated lignin composite is placed in H 2 Carbonizatio...

Embodiment 2

[0052] A preparation method of a lignin-based bimetallic catalyst, comprising the following steps:

[0053] S1. According to EHL-COOH 0.8g, ammonium molybdate 0.1mol, hexahydrate nickel nitrate 0.1mol, the molar ratio of molybdenum element in molybdenum salt and nickel element in nickel salt is 1:1, and the mass of each substance is weighed. Dissolve EHL-COOH in 30 mL of deionized water, then dissolve ammonium molybdate and nickel nitrate hexahydrate in the EHL-COOH aqueous solution step by step, stir for 10 min, and measure the pH of the mixed solution. Adjust the pH of the mixed solution to 9 with ammonia water and hydrochloric acid, stir for 4 hours, perform hydrothermal reaction at 180°C for 6 hours, centrifugal filter and wash the precipitate, place the sample in an oven to dry for 24 hours, take out, and weigh to obtain molybdenum nickel oxide - Carboxylated lignin complex.

[0054] S2. The above molybdenum-nickel oxide-carboxylated lignin composite is placed in H 2 Ca...

Embodiment 3

[0056] A preparation method of a lignin-based bimetallic catalyst, comprising the following steps:

[0057] S1. According to EHL-COOH 0.8g, ammonium molybdate 0.1mol, hexahydrate nickel nitrate 0.2mol, the molar ratio of molybdenum element in molybdenum salt and nickel element in nickel salt is 1:2, and the mass of each substance is weighed. Dissolve EHL-COOH in 30 mL of deionized water, then dissolve ammonium molybdate and nickel nitrate hexahydrate in the EHL-COOH aqueous solution step by step, stir for 10 min, and measure the pH of the mixed solution. Adjust the pH of the mixed solution to 9 with ammonia water and hydrochloric acid, stir for 4 hours, perform hydrothermal reaction at 180°C for 6 hours, centrifugal filter and wash the precipitate, place the sample in an oven to dry for 24 hours, take out, and weigh to obtain molybdenum nickel oxide - Carboxylated lignin complex.

[0058] S2. The above molybdenum-nickel oxide-carboxylated lignin composite is placed in H 2 Ca...

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Abstract

The invention belongs to the technical field of catalytic functional materials, and discloses a lignin-based bimetallic catalyst as well as a preparation method and application thereof. The invention provides a preparation method of a lignin-based bimetallic electro-catalytic catalyst, which is characterized in that lignin is modified and then coordinated with transition metal to form a metal-carboxylated lignin compound, and then the metal-carboxylated lignin compound is subjected to high-temperature carbonization reduction to obtain the lignin-based bimetallic electro-catalytic catalyst. The method comprises the following steps that S1, carboxylated lignin and metal are mixed step by step, and a metal oxide-carboxylated lignin compound is obtained through pH adjustment and stirring hydrothermal treatment; and S2, carrying out high-temperature carbonization treatment on the metal oxide-carboxylated lignin compound to obtain the carboxylated lignin-based bimetallic catalyst. The lignin-based bimetallic catalyst obtained by the preparation method disclosed by the invention shows excellent catalytic activity for hydrogen evolution by electrolysis of water.

Description

technical field [0001] The invention relates to the field of catalytic functional materials, and more particularly, to a preparation method of a lignin-based bimetallic catalyst and its application in the electrolysis of water for hydrogen evolution. Background technique [0002] At present, the high-efficiency catalysts for the hydrogen evolution of water electrolysis are mainly noble metals (for example: Pt / C) and transition metal carbides, phosphides, sulfides, etc. (for example: MoC, WC, etc.), but due to their limited reserves, synthesis costs are high. And the long-term stability is poor, resulting in an increase in cost and limiting its development prospects. Therefore, it is urgent to research and develop catalysts with abundant resources, low price, excellent catalytic activity and stability. Significant progress has been made in the application of transition metals and their carbides, nitrides, sulfides, and phosphides, which have high activity, excellent stabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B1/04
CPCC25B11/091C25B1/04Y02E60/36
Inventor 秦延林陈运镇邱学青林绪亮张文礼林煜翔漆毅杨学儒佘煜琪陈俊立罗芷澄
Owner GUANGDONG UNIV OF TECH
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