Novel metal catalyst loaded by mesoporous carbon and preparation method thereof

A metal catalyst, mesoporous carbon technology, applied in metal/metal oxide/metal hydroxide catalysts, catalyst supports, preparation of amino compounds, etc., can solve the problem of low reaction selectivity, easy deactivation of catalysts, and limited catalyst applications and other problems, to achieve the effect of enhancing catalytic activity and simple metal loading

Active Publication Date: 2012-06-27
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 metal Pd catalyst supported by a mesoporous carbon material co-doped with nitrogen and phosphorus, which is prepared by the following steps:

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

[0028] (2) Add 0.2g of the mesoporous carbon material co-doped with nitrogen and phosphorus obtained in step (1) into a 250mL beaker, add 50-100mL deionized water, sonicate for 5-30 minutes, and then add 4ml to a concentration of 0.056 mmol / ml PdCl 2 Aqueous solution, ultrasonic vibration for 5-...

Embodiment 2

[0030] This embodiment 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 4-methyl-N-pentylcyanopyridine tetrafluoroborate and 2g Ludox HS 40 silica sol at room temperature uniformly, then heat up to 800°C and calcinate for 3 hours, then use hydrogen fluoride after cooling to room temperature Ammonium decomposes the template Ludox-41 silica sol to obtain 0.5g of mesoporous carbon material co-doped with nitrogen, boron and fluorine. 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 the mesoporous carbon material co-doped with nitrogen, boron and fluorine obtained in step (1) into a 250mL beaker, add 50-100mL deionized water, sonicate for 5-30 minutes, and...

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 1-butyl-3-methylimidazole chloride salt and 1.5g MCM-41 uniformly at room temperature, then heat it up to 400℃ and calcinate for 3 hours, then use ammonium bifluoride to decompose the template after cooling to room temperature MCM-41, 0.6g of nitrogen-doped mesoporous carbon material is obtained, with a specific surface area of ​​150~1200m 2 / g.

[0036] (2) Add 0.3g of nitrogen-doped mesoporous carbon material into a 250mL beaker, add 50-100mL deionized water, sonicate for 5-30 minutes, 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 , Ultrasonic vibration for 5 to 60 minutes, filtration, washing, and drying to obtain a metal Pt catalyst supported by a mesoporous carbon material co-dope...

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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 supported by carbon materials, and particularly relates to a new type of mesoporous carbon material, metal catalysts supported by the material and their preparation methods. Background technique [0002] Mesoporous carbon material is a type of non-silicon mesoporous material. It has a large specific surface area and pore volume, good electrical conductivity, and excellent properties such as inertness to most organic solvents. It is easy to remove by calcination, and it is compatible with oxides. The materials are complementary in many aspects. Therefore, the mesoporous carbon materials have been widely used in catalysis, adsorption, separation, hydrogen storage, electrochemistry, etc. [0003] Metal catalysts supported by carbon materials are highly efficient catalysts for catalyzing reactions such as hydrogenation and oxidation. For example, in the literature (J. Catal. 2010, 270, 9-15), activated carbon...

Claims

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Application Information

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Patent Type & Authority Applications(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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