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Cartalyst for preparing hydrogen without COx by ammonia decompsition reaction and preparing method thereof

A catalyst and ammonia decomposition technology, applied in the direction of catalyst activation/preparation, catalyst carrier, chemical instruments and methods, etc., can solve the problems of difficult to meet high-efficiency production of hydrogen, low catalyst activity, etc., achieve low cost, simple preparation process, high active effect

Inactive Publication Date: 2003-11-19
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology involves making highly effective catalytic materials by combining two types of atoms: noble metals (Pt) or their alloys called gold(Au), together through strong chemical bonds like covalence bonding between them. These catalysts are very efficient at converting gases into liquid form for use in various applications such as fuel cells or energy production systems. They have excellent performance even up to 99% when used alone without other substances added on top.

Problems solved by technology

Technological Problem: Current methods used for storing and utilizing hydrocarbons have limitations due to their volatility and flammable nature. These techniques involve expensive equipment like gas separation plants and specialized facilities which require frequent maintenance over time. Therefore, an improved method called solid state hydride decomposiating catalysis can provide better efficiency while reducing environmental concerns associated with handling fossil sources containing harmful gases.

Method used

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  • Cartalyst for preparing hydrogen without COx by ammonia decompsition reaction and preparing method thereof
  • Cartalyst for preparing hydrogen without COx by ammonia decompsition reaction and preparing method thereof

Examples

Experimental program
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Embodiment 1

[0021] Take 0.1081g RuCl 3 Dissolve in 10ml of acetone to form a solution, then mix with 1g of carbon nanotubes, stir for 1h, then dry at 55°C for 5h, then raise the temperature to 500°C at 10°C / min, and bake at this temperature for 10h. Get 0.05g 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 2h, and then high-purity ammonia gas was introduced to react at 550°C, and the flow rate of ammonia gas was 50ml / min. Reaction results: the conversion rate of ammonia is 91.2%, and the generation rate of hydrogen is 61.1mmol / (min·g-cat); the stability of the catalyst is shown in the attached figure 1 .

Embodiment 2

[0023] Take 0.0313g RuCl 3 Dissolve in 10ml of acetone to form a solution, then mix with 1g of carbon nanotubes, stir for 1 hour, then dry at 85°C for 12 hours, then raise the temperature to 600°C at 2°C / min, and bake at this temperature for 2 hours. Get 0.05g catalyst (the content of Ru is 1.5%) and put in the quartz reactor, under 25% H 2 -In the Ar atmosphere (50ml / min), the temperature was raised to 400°C at 10°C / min, and activated at this temperature for 32h, and then high-purity ammonia gas was introduced to react at 550°C, and the flow rate of ammonia gas was 50ml / min. Reaction results: the conversion rate of ammonia was 75.5%, and the generation rate of hydrogen was 50.5 mmol / (min·g-cat).

Embodiment 3

[0025] Take 0.0309g RuCl 3 Dissolve in 30ml of acetone to form a solution, mix these solutions with 3g of carbon nanotubes, stir for 1 hour, then dry at 100°C for 8 hours, then raise the temperature to 400°C at 2°C / min, roast at this temperature for 5 hours and cool, then pass into 25%H 2 -Ar (150ml / min) was calcined at 500°C for 2h. Take 0.51g La(NO 3 ) 3 Dissolved in 30ml of water to form a solution, mixed with these calcined catalysts, dried at 55°C for 10h, and then calcined at 400°C for 2h to obtain a catalyst. Get 0.1g catalyst (Ru content is 0.46%, La content is 6.74%) and is put in quartz reactor, under 25% H 2 -In an Ar atmosphere (80ml / min), the temperature was raised to 500°C at 10°C / min, and activated at this temperature for 50h, and then high-purity ammonia gas was introduced to react at 550°C, and the flow rate of ammonia gas was 100ml / min. Reaction result: the conversion rate of ammonia is 63.8%, and the generation rate of hydrogen is 42.7mmol / (min·g-cat). ...

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Abstract

A catalyst for preparing non-COx hydrogen by decomposing reaction of ammonia is prepared from active component (0.5-20 wt.%) chosen from noble metal and the nitride of noble metal, carrier (70-99 wt.%) which is carbon nanotubes, and assistant (0-20 wt.%) chosen from the compounds of alkali metal, alkali-earth metal and rare-earth metal through immersing carbon nanotubes in the solution of active component's precursor, drying, calcining, reducing in hydrogen, adding assistant, drying, calcining and activating. Its advantages are high activity and stability, and high product purity.

Description

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Claims

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Application Information

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Owner TSINGHUA UNIV
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