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Catalyst carrier and catalyst comprising the same

A catalyst carrier and catalyst technology, which is applied in the direction of catalyst carrier, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problems that cannot be fully satisfied, precious metals are not easy to recycle, and the use cost is high, so as to reduce pressure drop and achieve large Large-scale industrial production and the effect of reducing usage

Active Publication Date: 2017-02-22
HIGHCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the material of the carrier is expensive, the processing is complicated, and the precious metal is not easy to recover after the catalyst is used, resulting in a significantly high cost of use.
[0006] Currently, there are no catalysts that adequately meet the requirements for the production of dialkyl oxalates by gas-phase catalytic carbon monoxide coupling in large-scale equipment

Method used

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  • Catalyst carrier and catalyst comprising the same

Examples

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Effect test

preparation example Construction

[0039] Preparation method of catalyst carrier

[0040] Taking a spherical catalyst carrier with a macroscopic macropore with a circular cross section as an example, its preparation method roughly includes the following steps: kneading the raw material powder, extruding it into a hollow cylinder with a ratio of inner and outer diameters > 0.2, pelletizing, and rounding , dried, and calcined to obtain a catalyst carrier with microscopic pores and a macroscopic macropore passing through the catalyst carrier in a straight line. In the kneading process, dilute nitric acid or acetic acid may be used. The above steps are conventional in the field of catalysts and are well known to those skilled in the art. Pelletizing and rounding can be performed, for example, by means of a pelletizer with roller knives. Drying is, for example, preferably carried out at a temperature of 90-150°C, especially 100-130°C. The calcination temperature of the catalyst support varies between 1150°C and 1...

Embodiment 1

[0062] Preparation of catalyst support

[0063] The purity is 99.99%, the specific surface area is 310m 2 The pseudo-boehmite / g is wetted with 1% by weight of nitric acid aqueous solution, kneaded, and extruded into a hollow cylinder with an inner diameter and an outer diameter of 4.6 mm and 6.5 mm; The hollow cylinder is pelletized and rounded to make a sphere with macroscopic macropores penetrating both ends of the carrier; the hollow sphere is dried overnight at 120°C and roasted at 1250°C for 8 hours to obtain the catalyst carrier of the present invention, which has microscopic Fine holes and a hollow spherical α-alumina carrier with circular macroscopic macropores passing through both ends of the carrier in a straight line and with the diameter of the sphere as the central axis, wherein the average diameter of the carrier is 5 mm, and the average diameter of the macroscopic macropores is is 3.5 mm, the average pore diameter / average diameter ratio is 0.7, and the specific...

Embodiment 2

[0069] Preparation of catalyst support

[0070] Repeat Example 1, but extrude into a hollow cylinder with an inner diameter and an outer diameter of 3.3 mm and 6.5 mm, respectively, to obtain a hollow spherical α-alumina carrier with an average pore diameter / average diameter ratio of 0.5, wherein the average diameter is 5 mm , with an average pore diameter of 2.5mm and a specific surface area of ​​5.3m 2 / g, the water absorption rate is 30.1% by weight, and the packing density is 0.75kg / L.

[0071] Catalyst preparation

[0072] The catalyst carrier of the present invention of 50g embodiment 2 was impregnated in equal volume for 2 hours by using mixed impregnating solution, wherein mixed impregnating solution was passed through by 0.14g palladium chloride, 0.21g ferric chloride hexahydrate, 14.6g water and 0.08g 61% hydrochloric acid Prepared by heating and dissolving, other steps are the same as in Example 1, thereby obtaining a hollow spherical α-alumina catalyst, wherein t...

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Abstract

The invention relates to a catalyst carrier used in a process of coupling and synthesizing dialkyl oxalates through gas phase catalysis of carbon monoxide, the catalyst carrier comprises micro pores and one or more macro pores which can pass through the catalyst carrier, wherein the ratio of the average pore size of the macro pores and the average diameter of the catalyst carrier is more than 0.2. The invention also relates to the catalyst carrier and a catalyst which comprises activated components and an optional additive and is loaded on the catalyst carrier. The catalyst can effectively perform gas phase catalysis on carbon monoxide to couple and generate the dialkyl oxalates, the heat dissipation is improved, the pressure drop is reduced, the usage amount of precious metal such as palladium is reduced, the usage cost of the catalyst and the production cost of the dialkyl oxalates are reduced, so that the industrial mass production of the dialkyl oxalates can be contributed to realize.

Description

technical field [0001] The present invention relates to a catalyst support used in the synthesis of dialkyl oxalate by gas-phase catalytic carbon monoxide coupling, and a catalyst comprising the catalyst support for the synthesis of dialkyl oxalate by gas-phase catalytic carbon monoxide coupling. Background technique [0002] The coupling of carbon monoxide to dialkyl oxalate is a fast, highly exothermic reaction that requires the use of a suitable catalyst to ensure safe production. Existing catalysts generally use spherical alumina with micropores, mesopores and / or macropores as a carrier, and palladium and other precious metals are supported thereon. The catalyst has the advantages of easy loading, uniform stacking, high and uniform heat dissipation, and easy recovery of precious metals after the catalyst is used. [0003] However, in recent years, the large-scale equipment has put forward higher requirements on the catalyst, especially high heat dissipation, low pressur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J21/04B01J32/00B01J35/10
CPCB01J21/04B01J23/8906B01J35/612B01J35/657B01J37/088B01J35/31B01J35/23B01J35/40B01J35/615B01J35/39B01J37/0213B01J37/06B01J37/0236B01J37/10B01J37/18B01J35/51
Inventor 曾建任占华端柴剑宇李永烨
Owner HIGHCHEM
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