Aluminum oxide loaded PtCu monatomic alloy catalyst and preparation method and application thereof

A technology of alumina-loaded and alloy catalysts, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of slow deactivation rate of catalytic dehydrogenation and the amount of precious metals Large and low precious metal content, etc., to achieve the effect of improving atom utilization, high specific surface area, and high dehydrogenation activity

Active Publication Date: 2018-10-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] What the present invention aims to solve is the technical problem that the existing Pt-based catalysts are prone to carbon deposition and deactivation, and the amount of precious metals is relatively large. It provides a PtCu single-atom alloy catalyst supported by alumina and its preparation method and its use in propane dehydrogenation. application, the catalyst has high activity, high stability, ultra-low precious metal content, slow catalytic dehydrogenation and deactivation rate, and can increase the yield of propylene

Method used

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  • Aluminum oxide loaded PtCu monatomic alloy catalyst and preparation method and application thereof
  • Aluminum oxide loaded PtCu monatomic alloy catalyst and preparation method and application thereof
  • Aluminum oxide loaded PtCu monatomic alloy catalyst and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0032] (1) 0.0021g mass parts of H 2 PtCl 6 and 0.3802g mass parts of Cu(NO 3 ) 2 ·3H 2 O was dissolved in 0.5 mL deionized water;

[0033] (2) 1.0000g Al 2 o 3 Soak in the above solution, ultrasonic for 0.5h, dry at room temperature for 12h, and completely dry at 100°C;

[0034] (3) Calcinate the solid obtained in (2) at 600°C for 2h, and then reduce at 600°C for 1h to obtain Pt-Cu / Al 2 o 3 Catalyst, the catalyst is based on the mass of the carrier, the mass percentage of Pt is 0.1%, and the mass percentage of Cu is 10%;

[0035] (4) The prepared Pt-Cu / Al 2 o 3 Catalyst pellets are 20-40 mesh granular catalysts;

[0036] (5) Pt-Cu / Al after tableting 2 o 3 Put the granular catalyst into the fixed bed reactor, feed nitrogen, and raise the temperature to a pretreatment temperature of 600°C; feed hydrogen for pretreatment, and maintain it at 600°C for 1 hour; cool down to the reaction temperature of 550°C, and the mass space velocity of propane is 4 hours -1 Switch ...

Embodiment 2

[0048] Prepare and react with embodiment 1 method, its difference is only in step (1) copper nitrate (Cu(NO 3 ) 2 ·3H 2 The mass of O) is 0.1902g; The obtained catalyst is based on the carrier mass, and the mass percentage of Cu is 5%.

Embodiment 3

[0050] Prepare and react with embodiment 1 method, its difference is only in step (1) copper nitrate (Cu(NO 3 ) 2 ·3H 2 The mass of O) is 0.7603g; The obtained catalyst is based on the carrier mass, and the mass percentage of Cu is 20%.

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Abstract

The invention discloses an aluminum oxide loaded PtCu monatomic alloy catalyst and a preparation method and application thereof. The catalyst takes Al2O3 as a carrier, takes Cu as an auxiliary, and loads a small amount of active components Pt; the mass percent of Pt is 0.025%-0.15%, and the mass percent of Cu is 5%-20%; and during preparation, a co-impregnation method is used, the Al2O3 carrier isimpregnated in an aqueous solution of chloroplatinic acid and copper nitrate, the PtCu / Al2O3 catalyst is obtained after drying and roasting and high-temperature reduction, and the catalyst has high activity and high stability, and is low in price and low in toxicity. The catalyst is suitable for reaction for producing olefin by dehydrogenation through low alkane, and is particularly suitable forreaction for producing propylene by dehydrogenation through propane in a hydrogenation atmosphere, the dehydrogenation activity is quite high under the condition of high temperature, the selectivity of the propylene can reach 90% or above, the stability is good, the use amount of Pt is small, the utilization rate is high, and compared with an industrial Pt series catalyst, the aluminum oxide loaded PtCu monatomic alloy catalyst is cheaper.

Description

technical field [0001] The present invention relates to supported catalyst, specifically, relate to a kind of aluminum oxide supported PtCu single-atom alloy catalyst and preparation method thereof and the application of the catalyst in the dehydrogenation of light alkanes to olefins (using propane dehydrogenation to produce propylene as the basis example). technical background [0002] Low-alkene olefins (such as ethylene, propylene, butene, butadiene, etc.) are the basic raw materials of chemical industry, especially propylene, which has become more and more in demand in recent years. Propylene is the basic raw material of the three major synthetic materials, mainly used in the production of acrylonitrile, acetone, propylene oxide and other products. At present, the supply of propylene mainly comes from the by-products of naphtha cracking to ethylene and petroleum catalytic cracking processes. However, with the development of shale gas technology, ethane has become cheap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C07C5/333C07C11/06
CPCB01J23/8926C07C5/3337C07C11/06Y02P20/52
Inventor 巩金龙孙国栋赵志坚曾亮陈赛
Owner TIANJIN UNIV
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