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Catalyst with vanadium oxide/graphene compound material and preparation method thereof

A composite material, vanadium oxide technology, applied in metal/metal oxide/metal hydroxide catalyst, preparation of organic compounds, catalyst for physical/chemical process, etc. The effect of low cost, simple process and short cycle

Inactive Publication Date: 2012-12-26
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention discloses for the first time the preparation method of a highly active vanadium oxide / graphene composite material catalyst applied to the liquid-phase catalyzed hydrogen peroxide oxidation of benzene to prepare phenol. Oxide / graphene composite catalyst VO x -Graphene, improve catalyst activity and selectivity

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  • Catalyst with vanadium oxide/graphene compound material and preparation method thereof
  • Catalyst with vanadium oxide/graphene compound material and preparation method thereof
  • Catalyst with vanadium oxide/graphene compound material and preparation method thereof

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specific Embodiment approach 1

[0018] Specific embodiment one: the vanadium oxide / graphene composite material catalyst of this embodiment is made of NH 4 VO 3 aqueous solution, graphite oxide, absolute ethanol and cetyltrimethylammonium bromide; where NH 4 VO 3 The concentration of vanadium element in the aqueous solution is 0.01~0.05mol / L, the mass ratio of vanadium element to graphite oxide is 0.001~0.008:0.05, the volume ratio of graphite oxide mass to absolute ethanol is 0.05g:28~38mL, graphite oxide and ten The mass ratio of hexaalkyltrimethylammonium bromide is 0.05:0.05~0.1.

specific Embodiment approach 2

[0019] Specific embodiment two: the preparation method of the vanadium oxide / graphene composite material catalyst of this embodiment is realized according to the following steps:

[0020] 1. Add NH 4 VO 3 Dissolved in deionized water, mixed to prepare NH with vanadium concentration of 0.01~0.05mol / L 4 VO 3 Aqueous solution, according to NH 4 VO 3 The mass ratio of vanadium element to graphite oxide in the aqueous solution is 0.001~0.08:0.05 with NH 4 VO 3 The aqueous solution is mixed with graphite oxide to make NH 4 VO 3 / graphite oxide aqueous solution, then by NH 4 VO 3 The mass of graphite oxide in the graphite oxide aqueous solution and the volume ratio of absolute ethanol is 0.05g: 28~38mL to NH 4 VO 3 / Add absolute ethanol to the graphite oxide aqueous solution, and obtain a mixed solution after ultrasonic dispersion treatment for 30-60 minutes;

[0021] 2. Move the mixed solution prepared in step 1 into a high-pressure reactor equipped with a polytetraflu...

specific Embodiment approach 3

[0027] Specific embodiment three: the difference between this embodiment and specific embodiment two is: in step one, NH with a concentration of vanadium element of 0.02~0.04mol / L is prepared 4 VO 3 aqueous solution. Other steps and parameters are the same as in the second embodiment.

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Abstract

The invention provides a catalyst with a vanadium oxide / graphene compound material and a preparation method thereof. The invention relates to a catalyst with a compound material and a preparation method thereof. The invention needs to solve the problems that the preparation process is complicated and the environment is also not protected so as to enhance the activity and the selectivity of a catalyst. The method comprises the following steps of: (1) preparing a mixed solution containing NH4VO3 and graphite oxide; (2) transferring the mixed solution into a high-pressure reaction kettle, then adding a surfactant of cetyl trimethyl ammonium bromide for carrying out a reaction, and cooling to room temperature naturally after finishing the reaction so as to form a solid product; and (3) washing the solid product by deionized water and absolute alcohol repeatedly, drying and then baking under the protection of inert gas respectively so as to prepare a catalyst VOx-Graphene with a vanadium oxide / graphene compound material after baking under the condition of air. The invention is applied to the preparation of a catalyst with a compound material.

Description

technical field [0001] The invention relates to a composite material catalyst and a preparation method thereof. Background technique [0002] Graphene has a perfect two-dimensional periodic planar structure, which can be used as an ideal catalyst carrier. Its unique surface structure and its electronic modification effect on loaded metals or metal oxides will make metal graphene systems or metal oxides - Graphene systems exhibit many excellent catalytic activities. Vanadium oxide is an important redox catalyst and is widely used in catalytic oxidation reactions. A large number of research work has shown that highly dispersed vanadium oxide species and isolated vanadium oxide sites are the active centers of various catalytic selective oxidation reactions, especially for liquid Phase-catalyzed selective oxidation of benzene to phenol has good catalytic performance. But the existing SiO 2 Molecular sieve is the preparation method of the vanadium oxide catalyst of support, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22C07C39/04C07C37/60
CPCY02P20/52
Inventor 董永利宋微娜魏立国解丽萍薛丽梅朱宇君袁福龙付宏刚
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY