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Novel metal catalyst loaded by mesoporous carbon and preparation method thereof

A metal catalyst, mesoporous carbon technology, applied in the direction of catalyst carrier, amino compound preparation, chemical instruments and methods, etc., can solve the problems of low reaction selectivity, easy deactivation of catalyst, limited catalyst application, etc. Simple, enhanced catalytic activity

Active Publication Date: 2015-01-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the noble metal catalysts supported by carbon are widely used, these catalysts also have their inherent weaknesses, such as the catalyst is easily deactivated when placed in the air, and the reaction selectivity is not high in some selective reactions (Chem.Commun.2003, 1960 -1961), as a catalyst, it is often necessary to add a cocatalyst (Science, 2009, 326, 1250-1252.) etc.
These problems limit the application of this type of catalyst, so the development of new metal catalysts supported by modified mesoporous carbon with air and hydrothermal stability, high activity and high selectivity has important practical application value.

Method used

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  • Novel metal catalyst loaded by mesoporous carbon and preparation method thereof
  • Novel metal catalyst loaded by mesoporous carbon and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] This embodiment provides a nitrogen and phosphorus co-doped mesoporous carbon material supported metal Pd catalyst, which is prepared by the following steps:

[0027] (1) Mix 1g of 1-pentylcyano-3-methylimidazolium hexafluorophosphate ionic liquid with 1.5g of molecular sieve SBA-15 at room temperature, then heat up to 600°C for 3 hours, cool to room temperature and use Ammonium bifluoride decomposes to remove SBA-15, and obtains 0.6g of nitrogen and phosphorus co-doped mesoporous carbon material. Elemental analysis shows that the mass content of nitrogen is 7.8%, and the mass content of phosphorus is 0.2%. The specific surface area is 150-1200m 2 / g.

[0028] (2) Add 0.2 g of nitrogen and phosphorus co-doped mesoporous carbon material obtained in step (1) into a 250 mL beaker, add 50 to 100 mL of deionized water, and ultrasonically oscillate for 5 to 30 minutes, then add 4 mL of mmol / ml PdCl 2 Aqueous solution, ultrasonic vibration for 5-30 minutes, finally add 5mgNa...

Embodiment 2

[0030] This example provides a metal Au catalyst supported by a mesoporous carbon material co-doped with nitrogen, boron, and fluorine, which is prepared by the following steps:

[0031](1) Mix 1g of 4-methyl-N-pentylcyanopyridinium tetrafluoroborate with 2g of Ludox HS 40 silica sol at room temperature, then heat up to 800°C for 3 hours, cool to room temperature and use hydrogen fluoride Ammonium decomposes the template agent Ludox-41 silica sol to obtain 0.5 g of nitrogen, boron, and fluorine co-doped mesoporous carbon material. Elemental analysis shows that the mass fraction of nitrogen in the material is 5.6%, the mass fraction of boron is 0.2%, and the mass fraction of fluorine The mass fraction is 0.1%, and its specific surface area is 150-1200m 2 / g.

[0032] (2) Add 0.3g of nitrogen, boron, and fluorine co-doped mesoporous carbon material obtained in step (1) into a 250mL beaker, add 50-100mL of deionized water, ultrasonically oscillate for 5-30 minutes, and then add ...

Embodiment 3

[0034] This embodiment provides a metal Pt catalyst supported by a mesoporous carbon material co-doped with nitrogen, boron, and fluorine, which is prepared by the following steps:

[0035] (1) Mix 1g of 1-butyl-3-methylimidazolium chloride with 1.5g of MCM-41 at room temperature, then heat up to 400°C and calcinate for 3 hours, then decompose the template with ammonium bifluoride after cooling to room temperature MCM-41, obtained nitrogen-doped mesoporous carbon material 0.6g, its specific surface area is 150-1200m 2 / g.

[0036] (2) Add 0.3g of nitrogen-doped mesoporous carbon material into a 250mL beaker, add 50-100mL of deionized water, oscillate ultrasonically for 5-30 minutes, and then add 10ml of chloroplatinic acid aqueous solution with a concentration of 0.038mmol / ml , sonicate for 5-30 minutes, and finally add 7mg NaBH 4 , ultrasonically oscillated for 5-60 minutes, filtered, washed, and dried to obtain a metal Pt catalyst supported by mesoporous carbon materials c...

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Abstract

The invention relates to a novel metal catalyst loaded by mesoporous carbon and a preparation method thereof. The metal catalyst is composed of 0.01-90 wt% of metal grains and 10-99.99 wt% of mesoporous carbon carrier, wherein the mesoporous carbon carrier is made of a heteroatom-doped mesoporous carbon material; the heteroatom-doped mesoporous carbon material is prepared by the following steps of: taking ionic liquid containing heteroatoms as a monomer and mixing the ionic liquid with a template agent at a room temperature; and then calcining the mixture at a temperature in a range of 400-1000 DEG C for 1-6 hours and cooling the mixture to the room temperature; and finally, removing the template agent to obtain the heteroatom-doped mesoporous carbon material. The average grain diameter of the metal grains is 1-100 nm and the mass percentage of the heteroatoms in the mesoporous carbon material is 0.01-80 wt%. The catalyst provided by the invention is good for enhancing the catalytic activity of the catalyst by adjusting the valence state of nano metal through doping the heteroatoms including nitrogen, sulfur, phosphorus, boron, fluorine and the like, and depositing and dispersing on the metal on the surface of the carrier. Furthermore, the catalyst is simple in preparation and is stable for water, air and heat.

Description

technical field [0001] The invention belongs to the field of metal catalysts carried by carbon materials, and in particular relates to a novel mesoporous carbon material, metal catalysts carried by the materials and their preparation methods. Background technique [0002] Mesoporous carbon materials are a class of non-silicon mesoporous materials, which have superior properties such as large specific surface area and pore volume, good electrical conductivity, and inertness to most organic solvents, and are easily removed by calcination. Materials are complementary in many aspects, so mesoporous carbon materials have been widely used in catalysis, adsorption, separation, hydrogen storage, and electrochemistry. [0003] Metal catalysts supported by carbon materials are efficient catalysts for catalyzing reactions such as hydrogenation and oxidation. For example, in the literature (J.Catal.2010, 270, 9-15), activated carbon or carbon nanofibers are used to support nano-Pd part...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44B01J23/52B01J23/42B01J23/755B01J32/00B01J21/18C07C211/46C07C209/36
Inventor 王勇徐旋巩玉同李浩然
Owner ZHEJIANG UNIV
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