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Application of supported palladium catalyst in selective hydrogenation reaction

A technology of supported palladium and hydrogenation reaction, which is applied in catalysts, molecular sieve catalysts, carbon compound catalysts, etc., and can solve problems not involved in catalyst applications, etc.

Inactive Publication Date: 2017-05-31
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The case does not address the use of such catalysts in selective dehydrogenation reactions

Method used

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  • Application of supported palladium catalyst in selective hydrogenation reaction
  • Application of supported palladium catalyst in selective hydrogenation reaction
  • Application of supported palladium catalyst in selective hydrogenation reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Silanization Modification of All-Silicon MCM-41

[0032] Weigh 3 g of all-silicon MCM-41 and place it in 150 mL of toluene, then add trimethylchlorosilane (5% by volume), stir and reflux at 110° C. for 3 h, and filter with suction. The filter cake was washed with toluene and dried at room temperature for 10 hours to obtain silanized MCM-41, designated as S-MCM-41.

Embodiment 2

[0037] Preparation of Pd Catalyst Precursor Supported by S-MCM-41

[0038] Prepare the Pd catalyst precursor supported by S-MCM-41 by equal-volume impregnation method: dissolve 0.022 g of palladium acetate in 5 mL of toluene, and then add it dropwise to 2 g of S-MCM-41, stirring while adding , until all the impregnating liquid is added dropwise. Aged at room temperature for 10 hours, then dried in an oven at 120°C for 12 hours, raised to 400°C in a muffle furnace at a rate of 1°C / min, and calcined for 5 hours to obtain a catalyst precursor.

Embodiment 3

[0040] Preparation of Supported Pd Catalyst

[0041] The catalyst precursor described in Comparative Example 1 and Example 2 was pressed into tablets and crushed to 20-40 meshes, then 0.05 g of the catalyst precursor was placed in a fixed-bed reactor with an inner diameter of 8 mm, and prepared by temperature-programmed reduction supported Pd catalyst. The specific conditions are as follows: in a hydrogen atmosphere with a total pressure of 1.0MPa, the temperature is raised from room temperature to 300°C at a rate of 10°C / min, and the gas flow rate is 75NmL / min. Pd catalyst. They are respectively denoted as Pd / S-MCM-41 and Pd / MCM-41, and their transmission electron microscope photos are as follows Figure 1A , Figure 1B shown by Figure 1A and Figure 1B It can be seen from the electron micrographs shown that the distribution of Pd in ​​MCM-41 is different from that in S-MCM-41. In Pd / MCM-41, Pd is distributed inside the mesoporous channels of MCM-41; while in Pd / S-MCM-41, ...

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Abstract

The invention relates to application of a supported palladium catalyst in selective hydrogenation reaction. The supported palladium catalyst takes Pd as an active ingredient and takes a mesoporous molecular sieve MCM-41 as a carrier, and the nano-particles of the active ingredient Pd are dispersed on the surface and / or porthole of the carrier. A research finds that in the supported catalyst which takes Pd as the active ingredient and takes the mesoporous molecular sieve MCM-41 as the carrier, the catalyst activity and / or selectivity is obviously superior to that of Pd / MCM-41 catalyst which does not have the characteristic when the nano-particles of the active ingredient Pd are dispersed on the surface and / or porthole of the carrier, and the application especially aims at the selective hydrogenation reaction of unsaturated hydrocarbons, alpha, beta-unsaturated aldehydes and halogenated nitrobenzene compounds.

Description

technical field [0001] The invention relates to the application of a supported palladium catalyst in selective hydrogenation reaction, belonging to the technical field of heterogeneous catalysis. Background technique [0002] Selective hydrogenation is an important category of reactions, which plays an important role in petrochemical, fine chemical and pharmaceutical fields. Supported noble metal catalysts are an important class of selective hydrogenation catalysts. For example, noble metal catalysts are used in the selective hydrogenation of phenylacetylene (J.Mol.Catal.A, 2014, 381:61-69), the selective hydrogenation of cinnamaldehyde (J.Catal., 2003, 214:78-87) and the halogenated nitric acid There are a lot of reports on the application of selective hydrogenation of base compounds (J.Mol.Catal.A, 2009,308:79-86). However, the hydrogenation activity of noble metals is too high, so it is necessary to control the distribution of metal components, add additives, or introdu...

Claims

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Application Information

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IPC IPC(8): B01J29/03C07C5/09C07C15/46C07C5/11C07C13/48C07C29/141C07C33/32C07C209/36C07C211/52C07B35/02
CPCC07B35/02C07C5/09C07C5/11C07C29/141C07C209/365B01J29/0325B01J37/0207C07C2529/03C07C2523/44B01J2229/32B01J2229/186B01J35/396B01J35/393C07C15/46C07C13/48C07C33/32C07C211/52Y02P20/52
Inventor 李翔董超王安杰
Owner PETROCHINA CO LTD
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