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Low-temperature ammonia decomposition hydrogen preparation catalyst and preparing method thereof

A catalyst and ammonia decomposition technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low stack density of carbon nanotubes, high cost, and increased catalyst cost and other problems, to achieve the effect of simple preparation process and high catalytic activity

Inactive Publication Date: 2004-09-15
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This catalyst is based on carbon nanotubes, which is relatively expensive; and the bulk density of carbon nanotubes is small, which may increase the cost of the catalyst in terms of catalyst molding

Method used

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  • Low-temperature ammonia decomposition hydrogen preparation catalyst and preparing method thereof
  • Low-temperature ammonia decomposition hydrogen preparation catalyst and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 0.1081g RuCl 3 Dissolve in 10ml of acetone to make a solution, and then mix with 1g of MgO [MgO is prepared according to the method described in CN 1280882A (2001), the grain size and specific surface of the sample after roasting at 600°C for 5 hours are 11nm and 150m 2 / g] mixed, stirred for 1 hour, dried at 55°C for 5 hours, then heated up to 600°C at 10°C / min, and fired at this temperature for 10 hours. After reduction of this catalyst at 500 °C, the Ru particle size is 4-10 nm. Get 0.1g catalyst (the content of Ru is 5%) and put in quartz reactor, under 25% H 2 -In the Ar atmosphere (80ml / min), the temperature was raised to 550°C at 5°C / min, and activated at this temperature for 2 hours, then the temperature was lowered to 500°C, and high-purity ammonia gas was introduced at this temperature for reaction. The flow rate is 50ml / min. Reaction results: the conversion rate of ammonia was 76.9%, and the generation rate of hydrogen was 25.7mmol / (min·g-cat).

Embodiment 2

[0024] The Ru / MgO catalyst was prepared according to the steps described in Example 1, then it was impregnated with NaOH aqueous solution, dried and calcined to obtain a NaRu / MgO catalyst with an atomic ratio of Ru and Na of 1:2. Get 0.1g catalyst and put in quartz reactor, in 25% H 2 -In the Ar atmosphere (80ml / min), the temperature was raised to 550°C at 5°C / min, and activated at this temperature for 2 hours, then the temperature was lowered to 520°C, and high-purity ammonia gas was introduced at this temperature for reaction. The flow rate is 50ml / min. Reaction result: the conversion rate of ammonia is 100%, and the generation rate of hydrogen is 33.4mmol / (min·g-cat).

Embodiment 3

[0026] Take 0.2162g RuCl 3 Dissolved in 10ml acetone to form a solution, and then mixed with 1g ZrO 2 【ZrO 2 Prepared according to the method described in CN 1260324A (2000), the grain size and specific surface of the sample after calcination at 600°C for 5 hours are 10nm and 70m 2 / g] mixed, stirred for 1 hour, dried at 55°C for 5 hours, then raised to 500°C at 10°C / min, and fired at this temperature for 10 hours. After reduction of this catalyst at 500 °C, the Ru particle size is 4-20 nm. Get 0.1g catalyst (the content of Ru is 9.8%) and put in the quartz reactor, under 25% H 2 -In the Ar atmosphere (80ml / min), the temperature was raised to 550°C at 5°C / min, and activated at this temperature for 2 hours, then the temperature was lowered to 500°C, and high-purity ammonia gas was introduced at this temperature for reaction. The flow rate is 50ml / min. Reaction results: the conversion rate of ammonia was 92.8%, and the generation rate of hydrogen was 31.0 mmol / (min·g-cat). ...

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Abstract

The invention discloses a catalyst preparing zero-COx hydrogen by ammonia decomposition reaction as well as its preparing method. Its components: active component 0.1-30%, carrier 60-99% and assistant 0-20%. The active component is a metal nitride where the metal is selected from the transition metals and has noble metal property, the carrier is a nano crystal metal oxide (crystal particle size 2-200nm); the assistant is selected from alkali metal, alkali earth metal and rare-earth compound. Its preparing method: firstly, dipping the carrier in the solution of the precursor of the active component, and then drying to bake at 300-900 deg.C; then reducing the sample at 300-900 deg.C by hydrogen, adding in the assistant, drying and baking and then activating at 300-900deg.C. It has very high catalysis activity to ammonia decomposition reaction and simple preparing technique. It can be applied to not only the reaction technique of making zero-COx hydrogen by ammonia decomposition, but also the purifying treatment.

Description

technical field [0001] The invention relates to a low-temperature high-activity ammonia decomposition reaction to prepare zero CO x A hydrogen catalyst and a preparation method thereof belong to the technical field of catalyst and its preparation. Background technique [0002] Hydrogen is a clean energy, and its combustion product is water. 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. At present, the main reasons hindering the large-scale application of hydrogen fuel cells are the storage of hydrogen and the deactivation of electrode catalysts. Storage of hydrogen includes the use of materials with high hydrogen storage capacity as well as liquid hydrogen-containing fuels. Hydrogen produced using carbon-containing organics inevitably contains CO, a poison that deactivates fuel cell electrodes. Because the hydrogen content (17.6%) of ammo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/00B01J23/02B01J27/24B01J37/00C01B3/04
CPCY02E60/364Y02E60/36
Inventor 徐柏庆尹双凤区泽棠吴清辉
Owner TSINGHUA UNIV
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