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Method for preparing platinum-based catalyst by using atomic layer deposition (ALD) technology, and applications of platinum-based catalyst in propane dehydrogenation reaction

An atomic layer deposition and catalyst technology, applied in the direction of catalysts, carbon compound catalysts, chemical instruments and methods, etc., can solve the problems of limited industrial application process, insufficient anti-coking ability of catalysts, and reduced catalyst activity, and achieve excellent anti-carbon deposition. performance effect

Inactive Publication Date: 2019-09-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the catalyst preparation process of the above work, it is necessary to strictly control a series of synthesis conditions such as the proportion of each component in the preparation process to obtain better catalyst activity and product selectivity. At the same time, the anti-coking ability of the catalyst is still insufficient, and the operation is extremely short After a period of time, the activity of the catalyst will be greatly reduced
Greatly limit its industrial application process

Method used

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  • Method for preparing platinum-based catalyst by using atomic layer deposition (ALD) technology, and applications of platinum-based catalyst in propane dehydrogenation reaction
  • Method for preparing platinum-based catalyst by using atomic layer deposition (ALD) technology, and applications of platinum-based catalyst in propane dehydrogenation reaction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] γ-Al 2 o 3 Calcined at 600°C for 4h in an air atmosphere to obtain an alumina carrier. Then weigh 0.02gSnCl 4 ·5H 2 O was dissolved in 3ml of ethanol, and this tin chloride solution was added dropwise onto 1g of alumina carrier, keeping the Sn content at 0.68wt%. Then seal it with a plastic wrap, let it stand at room temperature for 2 hours, put it into a vacuum oven at 30°C, and dry it overnight. The obtained sample was calcined at 590° C. for 2 hours in an air atmosphere, and then ground into powder to prepare a modified alumina carrier.

Embodiment 2

[0024] The tin-modified alumina prepared in Example 1 was used as a carrier to support platinum nanoparticles by ALD method. The specific method is as follows: dimethylcyclopentadiene hexaplatinum is used as a platinum precursor, ozone is used as a counter reactant, the evaporation temperature of the platinum precursor is 50°C, and the reaction temperature is 150°C. The process of preparing metal platinum nanoparticles: platinum precursor pulse time 150 seconds nitrogen purge 180 seconds, ozone pulse 50 seconds, nitrogen purge 180 seconds, grow a cycle of platinum nanoparticles, get catalyst 0.5% Pt-Sn / Al 2 o 3 , denoted as 0.5%Pt-Sn / Al 2 o 3 -ALD.

Embodiment 3

[0032] Above-mentioned catalyzer (embodiment 2, comparative example 1, comparative example 2, comparative example 3) is evaluated in fixed-bed reactor, and catalyst loading is 10ml, and catalyst is first reduced 2 hours under 550 ℃ of hydrogen atmospheres before reaction, Then pass reaction gas (propane:hydrogen = 1:1) at 500-600°C for reaction, the reaction pressure is normal pressure reaction, and the gas space velocity is 3200h -1 . Concrete reaction result is as shown in table 1 below:

[0033] Table 1

[0034]

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Abstract

The invention provides a method for preparing a platinum-based catalyst by using an atomic layer deposition (ALD) technology, and applications of the platinum-based catalyst in a propane dehydrogenation reaction, wherein the catalyst is an alumina-supported platinum-based catalyst, the carrier of the catalyst is gamma-Al2O3, the supported platinum is used as a main active component, the platinum loading amount is 0.1-5 wt%, the supported tin is used as the auxiliary agent of the catalyst, and the tin loading amount is 0.01-5 wt%. According to the present invention, the preparation process of the platinum-based catalyst is simple; and with the application of the platinum-based catalyst in a propane dehydrogenation reaction, the catalyst has good carbon deposition resistance, can be continuously operated for more than 60 h under reaction conditions while is not significantly deactivated, and has high selectivity to the reaction product, wherein the olefin selectivity can be maintained above 90% during the operation.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a method for preparing a platinum-based catalyst by atomic layer deposition technology and its application in propane dehydrogenation reaction. Background technique [0002] Propane is one of the important basic raw materials in the petrochemical field, and can be used to produce important chemical products such as polypropylene, acrylonitrile, and propylene oxide. Therefore, the demand for propylene in the world is extremely huge. At present, the industrial production of propylene mainly comes from the following processes: 1) by-product of naphtha cracking to ethylene process, 2) catalytic cracking process, 3) methanol to propylene (MTP) and propane dehydrogenation process. With the increasing demand for propylene in the world, the traditional petroleum catalytic cracking process can no longer meet people's demand. Recently, breakthroughs in shale gas technology in the Unite...

Claims

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Application Information

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IPC IPC(8): B01J23/62C07C11/06C07C5/333
CPCB01J23/626C07C11/06C07C5/3337C07C2523/62B01J35/23Y02P20/52
Inventor 黄家辉张军营朱剑谢慧晨刘芳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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