Alumina-supported ptcu single-atom alloy catalyst and its preparation method and application

An alumina-supported, alloy catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. Large and low noble metal content, etc., to achieve the effect of improving atom utilization, high specific surface area, and high dehydrogenation activity

Active Publication Date: 2021-05-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 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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  • Alumina-supported ptcu single-atom alloy catalyst and its preparation method and application
  • Alumina-supported ptcu single-atom alloy catalyst and its preparation method and application
  • Alumina-supported ptcu single-atom alloy catalyst and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0033] (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;

[0034] (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;

[0035] (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%;

[0036] (4) The prepared Pt-Cu / Al 2 o 3 Catalyst pellets are 20-40 mesh granular catalysts;

[0037] (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

[0049] 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

[0051] 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 a PtCu single-atom alloy catalyst supported by alumina and its preparation method and application. The catalyst uses Al 2 o 3 As a carrier, with Cu as an auxiliary agent, a small amount of active component Pt is loaded; the mass percentage of Pt is 0.025%-0.15%, and the mass percentage of Cu is 5%-20%; co-impregnation method is adopted during preparation, Will Al 2 o 3 The carrier is impregnated in an aqueous solution of chloroplatinic acid and copper nitrate, and after drying, roasting and high temperature reduction, PtCu / Al 2 o 3 The catalyst has high activity and high stability, low price and low toxicity. The catalyst of the present invention is suitable for the reaction of dehydrogenation of low paraffins to olefins, especially the reaction of propane dehydrogenation to propylene under a hydrogen atmosphere. The dehydrogenation activity is very high under high temperature conditions, the selectivity of propylene can reach more than 90%, and the stability is good. , and the amount of Pt is small, the utilization rate is high, and it is cheaper than industrial Pt-based catalysts.

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). [0002] technical background [0003] 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 beco...

Claims

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Application Information

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Patent Type & Authority Patents(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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