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Catalyst for preparing high surface area nitride or carbide by plasma method

A technology of plasma and nitride, applied in the direction of physical/chemical process catalysts, catalyst activation/preparation, chemical/physical processes, etc., can solve the problems of high temperature in the preparation process, unstable product performance, complex reaction process, etc. Effects of shorter time, lower cost, and lower reaction temperature

Inactive Publication Date: 2005-03-16
DALIAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

In order to achieve the purpose of overcoming the shortcomings of the traditional gas-solid phase temperature-programmed reaction method for preparing nitride or carbide catalysts, such as high preparation process temperature, long reaction time, complicated reaction process and unstable product performance.

Method used

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  • Catalyst for preparing high surface area nitride or carbide by plasma method

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example 1

[0009] Example 1: 20 grams of Mo are loaded into the fixed bed (2) 2 o 3 , and heated with a heating furnace (3), and at the same time with a reaction space velocity of 50h -1 Nitrogen gas is fed into the quartz tube fixed bed reactor (5), the gas first passes through the radio frequency plasma generator (1), and the nitrogen-containing plasma generated reacts with the transition metal oxide placed on the fixed bed. During the reaction, the reaction bed temperature was controlled at 400°C, the radio frequency power was 100W, and the composition of the tail gas was detected by chromatography-mass spectrometer (4) to control the reaction process and product quality. After 3 hours of reaction time, the molybdenum nitride catalyst was obtained. The specific surface area is 58m 2 / g.

example 2

[0010] Example 2: 20 grams of Mo are loaded into the fixed bed (2) 2 o 3 , and heated with a heating furnace (3), and at the same time with a reaction space velocity of 50h -1 Pass into the mixture of nitrogen and hydrogen to quartz tube fixed bed reactor (5), nitrogen and hydrogen mol ratio are 3, gas first passes through radio frequency plasma generator (1), the plasma containing nitrogen that produces is placed on fixed bed reactions of transition metal oxides. During the reaction, the reaction bed temperature was controlled at 400°C, the radio frequency power was 100W, and the composition of the tail gas was detected by chromatography-mass spectrometer (4) to control the reaction process and product quality. After 3 hours of reaction time, the molybdenum nitride catalyst was obtained. The specific surface area is 79m 2 / g.

example 3

[0011] Example 3: Load 20 grams of WO on the fixed bed (2) 3 , and heated with a heating furnace (3), and at the same time with a reaction space velocity of 100h -1 Pass into the mixture of nitrogen and ammonia to quartz tube fixed-bed reactor (5), nitrogen and ammonia mol ratio are 3, gas first passes through radio frequency plasma generator (1), the plasma containing nitrogen of generation and place Transition metal oxide reaction on a fixed bed. During the reaction, the temperature of the reaction bed is controlled at 400°C, the radio frequency power is 200W, and the composition of the tail gas is detected by chromatography-mass spectrometer (4) to control the reaction process and product quality. After 3 hours of reaction time, the tungsten nitride catalyst is obtained. The specific surface area is 89m 2 / g.

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Abstract

The invention relates to a kind of catalyst of the high proportion of surface area nitride or carbide, and its manufacturing method. Use the nitrogen source gas such as nitrogen and ammonia, or the carbon source gas such as the bit molecular hydrocarbon with less than C4 and the graphite to generate the plasma containing C or N by the function of ion generator. The generated plasma containing C or N reacts with the transition metal oxide to manufacture the transition metal nitride or carbide catalyst. The invention has the low reaction temperature, the shot reaction time, the simple reaction process, the wide range of application and so on.

Description

technical field [0001] The invention relates to the field of heterogeneous catalysts, especially nitride or carbide catalysts with large specific surface area. Background technique [0002] The current nitride or carbide catalysts are mainly prepared by the gas-solid phase temperature-programmed reaction method. The preparation method is described in the following two review articles: Research progress of molybdenum nitride deep hydrodesulfurization catalyst, "Modern Chemical Industry", 2003, 23(5), P17-202; Metal carbides and nitrogenes as potential catalysis for hydroprocessing, "Applied Catalysis A: general", 2003, 240(1-2), P1-28. When the gas-solid phase reaction method is used to prepare nitride or carbide catalysts, ammonia is mainly used as the nitriding agent, and methane is used as the carbonizing agent. The temperature of the preparation process is high (usually above 700 ° C), and the reaction time is long. Hours or more, the reaction process is complicated, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01J27/24B01J37/34
Inventor 肖进彬
Owner DALIAN UNIV
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