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Supported PtZn intermetallic alloy catalyst as well as preparation method and application thereof

一种金属间合金、催化剂的技术，应用在催化剂活化/制备、金属/金属氧化物/金属氢氧化物催化剂、碳化合物催化剂等方向，能够解决Pt系催化剂易积碳失活、催化脱氢失活速率慢、贵金属用量大等问题，达到提高原子利用率、重复性高、高比表面积的效果

Active Publication Date: 2020-07-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, to solve the technical problems of the existing Pt-based catalysts, which are prone to carbon deposition and deactivation, and the amount of precious metals is large, and provide a supported PtZn intermetallic alloy catalyst and its preparation Method and application in propane dehydrogenation, the catalyst has high activity, high stability, ultra-low noble metal content, slow deactivation rate of catalytic dehydrogenation, and can increase the yield of propylene

Method used

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  • Supported PtZn intermetallic alloy catalyst as well as preparation method and application thereof
  • Supported PtZn intermetallic alloy catalyst as well as preparation method and application thereof
  • Supported PtZn intermetallic alloy catalyst as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0038] (1) 0.0021g mass parts of H 2 PtCl 6 and 0.078g mass parts of Zn(NO 3 ) 2 ·6H 2 O was dissolved in 4 mL deionized water;

[0039] (2) 1.0000gSiO 2 (or Al 2 o 3 ) soaked in the above solution, ultrasonicated for 0.5h, dried at room temperature for 12h, and completely dried at 100°C;

[0040] (3) Reduce the solid obtained in (2) at 600°C for 1 h to obtain PtZn / SiO 2 (or PtZn / 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 Zn is 0.17%;

[0041] (4) the prepared SiO 2 (or Al 2 o 3 ) the supported PtZn intermetallic catalyst tablet is 20-40 purpose granular catalyst;

[0042] (5) SiO after tableting 2 (or Al 2 o 3 ) loaded PtZn intermetallic granular catalyst into a fixed-bed reactor, feed nitrogen, and heat up to a pretreatment temperature of 600°C; feed hydrogen for pretreatment, and maintain it at 600°C for 1 hour; cool down to a reaction temperature of 550°C, Propane ma...

Embodiment 2

[0054] Prepare and react with embodiment 1 method, its difference is only in step (1) zinc nitrate (Zn(NO 3 ) 2 ·6H 2 The quality of O) is 0.026g; The obtained catalyst is based on the carrier quality, and the mass percentage of Zn is 0.06%.

Embodiment 3

[0056] Prepare and react with embodiment 1 method, its difference is only in step (1) zinc nitrate (Zn(NO 3 ) 2 ·6H 2 The quality of O) is 0.234g; The obtained catalyst is based on the carrier quality, and the mass percentage of Zn is 0.5%.

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Abstract

The invention discloses a supported PtZn intermetallic alloy catalyst as well as a preparation method and an application thereof. The SiO2 is used as a carrier of the catalyst, Zn is used as an assistant of the catalyst, and a small amount of active component Pt is loaded; wherein the mass percentage content of Pt is 0.025%-1%, and the mass percentage content of Zn is 0.025%-1.7%; during preparation, a co-impregnation method is adopted, the SiO2 carrier is impregnated in an aqueous solution of chloroplatinic acid and zinc nitrate, the PtZn / SiO2 catalyst is obtained after drying and high-temperature reduction, and the catalyst has high activity, high stability, low price and low toxicity. The catalyst disclosed by the invention is suitable for a reaction for preparing olefin by dehydrogenating low-chain alkane, particularly for preparing propylene by dehydrogenating propane in a hydrogen atmosphere, has very high dehydrogenation activity under a high-temperature condition, has good stability, low Pt consumption and high utilization rate, and is cheaper than an industrial Pt catalyst, and the propylene selectivity can reach 90% or above.

Description

technical field [0001] The present invention relates to supported catalyst, in particular, relates to a kind of SiO 2 A supported PtZn intermetallic alloy catalyst, a preparation method thereof, and an application of the catalyst in the dehydrogenation of light alkanes to olefins (taking propane dehydrogenation to propylene as an 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 become cheaper and eas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/60C07C5/333C07C11/06
CPCB01J23/60C07C5/3337C07C2523/60C07C11/06Y02P20/52C07C2521/04C07C2521/08B01J37/0009B01J37/0063B01J8/02B01J8/0285B01J35/30B01J21/04B01J21/08B01J37/0201B01J37/08B01J37/18B01J35/40B01J35/50
Inventor 巩金龙陈赛曾亮
Owner TIANJIN UNIV
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