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Carbon-supported transitional metal carbon nitride compound as well as preparation and application thereof

A carbonitride and transition metal technology, applied in the field of supported transition metal carbonitride and its preparation, can solve problems such as single nitride or carbide, and achieve the effects of low preparation cost, simple preparation process and easy molding

Active Publication Date: 2009-04-22
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

Due to the limitation of the reaction atmosphere, this preparation method can only prepare a single nitride or carbide
[0004] According to the survey, there are no relevant patents and literature reports on transition metal carbonitrides and their preparation methods, and their further application in various hydrogen-related reactions.

Method used

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  • Carbon-supported transitional metal carbon nitride compound as well as preparation and application thereof
  • Carbon-supported transitional metal carbon nitride compound as well as preparation and application thereof
  • Carbon-supported transitional metal carbon nitride compound as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] WN x C y Preparation of / AC

[0028] Weigh 0.62g, 1.10g, 2.75g, 4.88g of ammonium metatungstate and dissolve them in 6.0ml of deionized water respectively, then impregnate equal volumes of the obtained clear solutions onto 4.0g of activated carbon (AC) carriers, and dry at room temperature for 12 hours, then dried in an oven at 120°C for 12 hours, and fired at 500°C for 4 hours under a nitrogen atmosphere to obtain WO 3 / AC precursor. WO 3 / AC precursor, temperature programmed reaction in ammonia gas, the space velocity is 5000 / hr, from room temperature to 450 °C at a rate of 10 °C / min, and then raised to 800 °C at a rate of 1 °C / min. After keeping at the temperature for 2 hours, cool to room temperature to prepare WN with active component mass content of 10, 16.7, 33.3, 55 wt%. x C y / AC Catalyst.

[0029] Active ingredient 16.7wt% WN prepared as above x C y The results of X-ray diffraction and transmission electron microscopy of the / AC catalyst are as follow...

Embodiment 2

[0031] WN at different temperatures x C y Preparation of / AC (active component 16.7wt%)

[0032] The difference from Example 1 is that WN was prepared at final preparation temperatures of 800°C, 850°C and 900°C, respectively x C y / AC (16.7 wt%) catalyst. The X-ray diffraction results of the obtained sample are as follows image 3 shown. It can be seen from the figure that WN is produced at 800°C x C y Catalyst, WN can be produced when the temperature rises above 850°C x C y and W 2 C mixed-phase catalyst.

Embodiment 3

[0034] WN at different airspeeds x C y Preparation of / AC (active component 16.7wt%)

[0035] The difference from Example 1 is that the space velocity of ammonia is 2500hr respectively -1 , 5000hr -1 , 10000hr -1 WN was produced under the condition x C y / AC (16.7 wt%) catalyst. The X-ray diffraction results of the obtained sample are as follows Figure 4 shown. From Figure 4 It can be seen that WN can be obtained at different airspeeds x C y / AC, increase the preparation space velocity, which is beneficial to WN x C y Dispersion on the surface of activated carbon.

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Abstract

The invention relates to a charcoal-supported transition metal carbon-nitrogen compound, a preparation method and application thereof. The transition metal compound is supported on a charcoal carrier by adopting a dipping method, and is dried and roasted to obtain a precursor. The prepared precursor is subjected to temperature programmed reaction in mixed gas of ammonia gas and hydrogen gas to obtain the transition metal carbon-nitrogen compound highly dispersed on the charcoal carrier. The charcoal-supported transition metal carbon-nitrogen compound prepared through the method shows good catalytic activity in various hydrogen-involved reactions.

Description

technical field [0001] The present invention relates to carbon-supported transition metal carbonitrides, and specifically provides a supported transition metal carbonitride with carbon materials as a carrier and a preparation method thereof, as well as the use of such carbonitrides in hydrazine decomposition reactions and other hydrogen-related processes. React application. Background technique [0002] Transition metal nitrides and carbides are a class of mesenchymal compounds formed by nitrogen or carbon atoms embedded in the lattice of transition metals, and have the properties of covalent solids, ionic crystals, and transition metals at the same time. Since Levy and Boudart reported that tungsten carbide exhibited noble metal-like properties in a series of catalytic reactions in 1973, transition metal nitrides and carbides have attracted great attention as a new class of catalytic materials. [0003] At present, in the field of catalysis, the synthesis of pure phase and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J27/22C01B21/02C01C1/02C01B3/04
CPCY02E60/364Y02E60/36Y02P20/52
Inventor 张涛孙军郑明远王晓东
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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