Supported type nickel catalyst for producing hydrogen from decomposition of ammonia and preparation method

A nickel catalyst, supported technology, applied in molecular sieve catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of easy inclusion of leads and difficulty in controlling the pore structure of catalysts, etc. Achieve the effect of strong repeatability, high stability and high specific surface area

Active Publication Date: 2010-08-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst prepared by this method has high activity for ammonia decomposition. However, the disadvantage of the co-precipitation method is that the precursor is easily included in the support oxide, and it is difficult to control the pore structure of the catalyst.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mix nickel nitrate (28.2g), nitric acid (1.98g), urea (19.3g), SBA-15 (1.95g) and deionized water to prepare a 300ml suspension, and then heat to 90°C. After stirring for 120 minutes the temperature was lowered to 25°C and filtered. The samples were washed several times with 100 ml of deionized water. The sample obtained was treated at 110° C. for 24 hours. Dried samples were fired at 550°C for 3 hours. Get 0.1g catalyst and put in quartz reactor, in 25% H 2 / He mixed gas atmosphere from room temperature to 500°C at 5°C / min, and activated at this temperature for 5 hours, then purged with helium and passed through high-purity ammonia for reaction. Under the reaction conditions of 600°C and space velocity of 30000ml / h.g-cat, the ammonia decomposition reaction results are as follows: the ammonia conversion rate is 92.1%, and the hydrogen formation rate is 30.8mmol / min.g cat ; The nickel particles in the active center are about 7.8 nanometers.

Embodiment 2

[0032] The stirring time of catalyst preparation is 180 minutes, and others are identical with embodiment 1. Under the reaction conditions of 600°C and space velocity of 30000ml / h.g-cat, the ammonia decomposition reaction results are as follows: the ammonia conversion rate is 96.2%, and the hydrogen formation rate is 32.2mmol / min.g cat ; The nickel particle in the active center is about 7.4 nanometers.

Embodiment 3

[0034] The reduction temperature is 600°C, and the others are the same as in Example 2. Under the reaction conditions of 600°C and space velocity of 30000ml / h.g-cat, the ammonia decomposition reaction results are as follows: the conversion rate of ammonia is 100%, and the formation rate of hydrogen is 33.5mmol / min.g cat ; The nickel particle of the active center is about 5.7 nanometers.

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Abstract

The invention relates to a loaded nickel catalyst which is used for hydrogen generation by ammonia decomposition. Ni is used as an active component; monox, aluminium oxide or titanium dioxide is used as a carrier. Mass percentage content of the active component is 1 percent to 50 percent. A preparation step thereof includes: soluble nickel salt, PH value regulator, precipitant, carrier and de-ionized water are prepared into suspension liquid which is heated to the temperature of 70 DEG C to 110 DEG C and deposited for 60 minutes to 300 minutes; the suspension liquid is cooled to the temperature of 20 DEG C to 30 DEG C, then filtration, water washing and filtration are carried out; drying is carried out for 18 hours to 24 hours at the temperature of 80 DEG C to 120 DEG C, and then calcinations is carried out for 2 hours to 6 hours at the temperature of 400 DEG C to 900 DEG C; in a hydrogen atmosphere or a mixture atmosphere of hydrogen and helium, activation is carried out at the temperature of 400 DEGC to 900 DEG C to reduce and prepare the loaded nickel catalyst. The loaded nickel catalyst prepared by the method is characterized by high activity in ammonia decomposition and can be used in the technology of generating hydrogen without COx by ammonia decomposition and in the process of purification treatment of various gases containing ammonia.

Description

technical field [0001] The invention relates to a catalyst for ammonia decomposition to produce COx-free hydrogen. [0002] The present invention also relates to a method for preparing the above-mentioned catalyst. [0003] The present invention also relates to the application of the above-mentioned catalyst in the hydrogen production reaction of ammonia decomposition. Background technique [0004] At present, the research and development of proton exchange membrane fuel cell (PEMFC) using hydrogen as fuel is attracting more and more attention from enterprises and government departments. However, the purity, storage and transportation of hydrogen have become one of the bottlenecks in the development of hydrogen sources for fuel cells. Hydrogen produced from carbon-containing substrates inevitably contains COx (x=1-2) gas that reduces the life of the proton membrane fuel cell; at the same time, the storage of hydrogen requires the use of materials with high hydrogen storage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J29/064C01B3/04
CPCY02E60/364Y02E60/36
Inventor 刘红超王华刘中民沈江汉孙颖
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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