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Method for synthesizing VIII first-row transition metal and molybdenum/tungsten double-metal carbide catalyst at low temperature

A bimetallic carbide and bimetallic oxide technology, applied in physical/chemical process catalysts, chemical instruments and methods, organic chemistry, etc., can solve the problems of bimetallic carbide carbon pollution, block active sites, etc., and achieve operational Simple, energy-saving product particles, the effect of less surface carbon pollution

Inactive Publication Date: 2017-09-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such high temperatures can also lead to carbon contamination on the surface of bimetallic carbides, which would severely block their active sites as catalysts.

Method used

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  • Method for synthesizing VIII first-row transition metal and molybdenum/tungsten double-metal carbide catalyst at low temperature
  • Method for synthesizing VIII first-row transition metal and molybdenum/tungsten double-metal carbide catalyst at low temperature
  • Method for synthesizing VIII first-row transition metal and molybdenum/tungsten double-metal carbide catalyst at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: the Na of 0.005mol 2 MoO 4 2H 2 O and 0.005mol Ni(NO 3 ) 2 ·6H 2 O was dissolved in 20 mL deionized water, respectively, and stirred to mix at room temperature. A light green precipitate was obtained, and after stirring for 30 minutes, the mixture was transferred and sealed in a 60 mL polytetrafluoroethylene-lined stainless steel autoclave, and kept in an electric oven at 180 °C for 4 hours. Then the autoclave was taken out from the oven and allowed to cool to room temperature naturally. The yellow-green precipitate was collected by centrifugation, washed well with water and ethanol, and dried overnight at 80 °C. Finally, the product was ground into a fine powder for characterization.

[0027] Activated carbon (AC) was prepared through a chemical activation route from coconut shells. The specific surface area of ​​activated carbon was obtained by the nitrogen adsorption and desorption isotherm measurements at 77 K to be about 1000 m 2 / g, the aver...

Embodiment 2

[0028] Embodiment 2: the Na of 0.005mol 2 MoO 4 2H 2 O and 0.005mol of Co(NO 3 ) 2 ·6H 2 O was dissolved in 20 mL deionized water, respectively, and stirred to mix at room temperature. A light green precipitate was obtained, and after stirring for 30 minutes, the mixture was transferred and sealed in a 60 mL polytetrafluoroethylene-lined stainless steel autoclave, and kept in an electric oven at 180 °C for 4 hours. Then the autoclave was taken out from the oven and allowed to cool to room temperature naturally. The yellow-green precipitate was collected by centrifugation, washed well with water and ethanol, and dried overnight at 80 °C. Finally, the product was ground into a fine powder for characterization.

[0029] The as-synthesized bimetallic oxide was mixed with activated carbon so that the molar ratio of total metal to carbon was 1:25, and the mixture was homogeneously ground for 30 min with a mortar and pestle. The resulting mixture (0.5 g) was transferred to a ...

Embodiment 3

[0030] Embodiment 3: the Na of 0.005mol 2 MoO 4 2H 2 O and 0.005mol FeCl 2 ·6H 2 O was dissolved in 20 mL deionized water, respectively, and stirred to mix at room temperature. A light green precipitate was obtained, and after stirring for 30 minutes, the mixture was transferred and sealed in a 60 mL polytetrafluoroethylene-lined stainless steel autoclave, and kept in an electric oven at 180 °C for 4 hours. Then the autoclave was taken out from the oven and allowed to cool to room temperature naturally. The yellow-green precipitate was collected by centrifugation, washed well with water and ethanol, and dried overnight at 80 °C. Finally, the product was ground into a fine powder for characterization.

[0031] The as-synthesized bimetallic oxide was mixed with activated carbon so that the molar ratio of total metal to carbon was 1:15, and the mixture was uniformly ground for 30 min with a mortar and pestle. The resulting mixture (0.5 g) was transferred to a quartz boat p...

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Abstract

The invention provides a method for synthesizing VIII first-row transition metal and molybdenum / tungsten double-metal carbide catalyst at low temperature and belongs to the technical field of material preparation and application. The method is characterized in that double-metal oxide is obtained through hydrothermal treatment, and carbon-thermal hydrogen reduction is performed to prepare pure-phase double-metal carbide. Compared with a traditional arc-melting method and a programmed-temperature reduction method, the method has the advantages that the method is low in temperature, simple to operate, energy-saving, small in product particle, little in surface carbon pollution, and the like; the method is promising in application prospect; the prepared double-metal carbide catalyst is applicable to hydrogenation, dehydrogenation, hydrogenolysis, deoxidization, methane syngas, isomerization, ammonia decomposition, hydrogen evolution reaction, hydrogen oxidation reaction, oxygen reduction reaction, water gas transformation, catalyst carriers and the like.

Description

technical field [0001] The invention belongs to the field of material preparation technology and application, and relates to a low-temperature synthesis of a bimetallic carbide catalyst and application of the first transition metal of group VIII and molybdenum and tungsten. Background technique [0002] Bimetallic carbide catalysts of the first row transition metals of group VIII and molybdenum and tungsten are widely used because they can be used for hydrogenation, dehydrogenation, hydrogenolysis, deoxygenation, methane synthesis gas, isomerization, ammonia decomposition, hydrogen evolution reaction , hydrogen oxidation reaction, oxygen reduction reaction, water gas shift and catalyst carrier, etc. [0003] At present, there have been various methods for the synthesis of bimetallic carbides of Group VIII metals nickel, cobalt, and iron with tungsten or molybdenum. The earliest attempts, using arc melting, required high energy consumption due to the high temperatures requir...

Claims

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Application Information

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IPC IPC(8): B01J27/22C07C5/10C07C5/11C07C13/50C07C13/48
CPCB01J27/22C07C5/10C07C5/11C07C13/50C07C13/48
Inventor 梁长海刘荣李闯
Owner DALIAN UNIV OF TECH
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