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Method for preparing hydrogen through hydrogen iodide catalysis and decomposition

A technology of catalytic decomposition and hydrogen iodide, which is applied in the direction of iodine/hydrogen iodide, chemical instruments and methods, physical/chemical process catalysts, etc. Poor performance and other problems, to achieve the effect of wide reaction temperature range and pressure range, good catalyst economy

Active Publication Date: 2016-08-10
TSINGHUA UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0013] In order to solve the problems of high cost and poor economic efficiency of the traditional hydrogen iodide decomposition catalyst, especially the problem that the activity and stability are difficult to meet the long-term operation of the iodine-sulfur cycle, the present invention provides a hydrogen iodide decomposition method with high efficiency, stability and economy

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  • Method for preparing hydrogen through hydrogen iodide catalysis and decomposition
  • Method for preparing hydrogen through hydrogen iodide catalysis and decomposition

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Embodiment 1

[0023] 0.5 g of activated carbon (AC) loaded molybdenum carbide 5% Mo 2 The C / AC catalyst is loaded into a tubular fixed-bed reactor for the decomposition of hydrogen iodide, and the reaction temperature is controlled at 500° C. Hydroiodic acid (analytical pure hydroiodic acid, HI content ≥ 57%, Rizhao Lidex Chemical Co., Ltd.) The feed rate is 1.0ml / min, and the reaction pressure is normal pressure. Utilize sodium hydroxide standard solution to titrate the H in hydroiodic acid before and after the reaction + concentration to calculate the conversion rate of reaction, hydrogen iodide conversion rate is 22%, close to the thermodynamic equilibrium conversion rate under this condition (at 1atm, under 500 ℃ of reaction conditions, hydrogen iodide decomposition equilibrium conversion rate is about 23%).

Embodiment 2

[0027] 0.2 g of molybdenum carbide supported on activated carbon (AC) 1% Mo 2 The C / AC catalyst was loaded into a tubular fixed-bed reactor for hydrogen iodide decomposition, the reaction temperature was controlled at 500° C., the feed rate of hydroiodic acid was 1.0 ml / min, and the reaction pressure was normal pressure. Utilize sodium hydroxide standard solution to titrate the H in hydroiodic acid before and after the reaction + Concentration to calculate the conversion rate of reaction, hydrogen iodide conversion rate is 7%.

Embodiment 3

[0032] 0.2 g of activated carbon (AC) loaded molybdenum carbide 5% Mo 2The C / AC catalyst was loaded into a tubular fixed-bed reactor for hydrogen iodide decomposition, the reaction temperature was controlled at 500° C., the feed rate of hydroiodic acid was 1.0 ml / min, and the reaction pressure was normal pressure. Utilize sodium hydroxide standard solution to titrate the H in hydroiodic acid before and after the reaction + Concentration to calculate the conversion rate of reaction, hydrogen iodide conversion rate is 9.5%.

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Abstract

The invention provides a method for preparing hydrogen through hydrogen iodide catalysis and decomposition and belongs to the technical field of catalysis reaction .According to the method, molybdenum-based carbide or molybdenum-based nitride is adopted as hydrogen iodide decomposition catalyst, reaction temperature is 350-850 DEG C, and normal pressure is -40 atm .The molybdenum-based carbide comprises pure molybdenum carbide and supported molybdenum carbide .The molybdenum-based nitride comprises pure molybdenum nitride and supported molybdenum nitride .The mass percentage of molybdenum in a supported molybdenum carbide and molybdenum nitride catalyst is 0.5-30% .The method for preparing hydrogen through hydrogen iodide catalysis and decomposition has the advantages of being low in catalyst cost, high in activity and good in stability .Reaction for producing hydrogen through hydrogen iodide catalysis and decomposition can be efficiently and stably conducted through the method.

Description

technical field [0001] The invention relates to a method for producing hydrogen by catalytically decomposing hydrogen iodide, belonging to the technical field of catalytic reactions. Background technique [0002] Iodine-sulfur thermochemical cycle hydrogen production is considered to be one of the promising large-scale hydrogen production methods because of its high efficiency and environmental friendliness. The cycle consists of the following three reactions: [0003] (1) Bunsen reaction: SO 2 +I 2 +2H 2 O→2HI+H 2 SO 4 (120°C), exothermic reaction; [0004] (2) Sulfuric acid decomposition reaction: H 2 SO 4 →H 2 O+SO 2 +1 / 2O 2 (800-900°C), endothermic reaction; [0005] (3) Hydrogen iodide decomposition reaction: 2HI→H 2 +I 2 (300-500°C), endothermic reaction. [0006] Using high-temperature gas-cooled reactor or solar energy or other high-temperature heat source to couple with the above three reactions, the net reaction of thermochemical cycle is: H 2 O→H ...

Claims

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Application Information

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IPC IPC(8): C01B3/04C01B7/14B01J27/22B01J27/24
CPCB01J27/22B01J27/24C01B3/04C01B7/14C01B2203/1041C01B2203/1082C01B2203/1088Y02E60/36
Inventor 王来军胡嵩智徐庐飞陈崧哲张平
Owner TSINGHUA UNIV
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