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Catalyst used for preparing low-carbon alkene by dehydrogenation of low-carbon alkane and process method of catalyst

A technology of low-carbon alkanes and low-carbon olefins, applied in the field of catalysts, can solve the problems of serious carbon deposition, poor single-pass stability, and low olefin selectivity, and achieve the effects of reducing carbon deposition, improving catalyst performance, and high olefin selectivity

Pending Publication Date: 2018-01-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing catalysts used for the dehydrogenation of low-carbon alkanes to prepare low-carbon olefins have low olefin selectivity, serious carbon deposition, and poor single-pass stability under high temperature conditions. A catalyst for preparing low-carbon olefins from alkane dehydrogenation. The preparation method of the catalyst is simple, and the effective utilization rate of the unit active component is high. The advantages

Method used

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  • Catalyst used for preparing low-carbon alkene by dehydrogenation of low-carbon alkane and process method of catalyst
  • Catalyst used for preparing low-carbon alkene by dehydrogenation of low-carbon alkane and process method of catalyst
  • Catalyst used for preparing low-carbon alkene by dehydrogenation of low-carbon alkane and process method of catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Weigh an appropriate amount of MgAl 2 o 4 Carrier, added to containing appropriate amount of chloroplatinic acid (H 2 PtCl 6 .6H 2 O), anhydrous tin tetrachloride (SnCl 4 ) in a mixed aqueous solution at 60°C for 2 hours, and then dry the soaked sample in an oven at 110°C for 4 hours. The raw materials used are of high purity. The dried samples were calcined at 600°C for 4 hours in a muffle furnace, and then reduced by hydrogen at 500°C for 2 hours. Before the prepared sample was used in the catalytic dehydrogenation reaction, it was treated with water vapor at 500° C. for 2 hours to obtain catalyst A, which was ground into 40-60 mesh particles for catalyst evaluation. The loading of Pt in the catalyst A is 0.3% of the catalyst weight, the loading of Sn is 0.4% of the catalyst weight, and the catalyst also contains Hg 180ppm, Pb 160ppm, and Ti 100ppm in mass fraction.

Embodiment 2

[0028]Weigh an appropriate amount of MgAl 2 o 4 Carrier, added to containing appropriate amount of chloroplatinic acid (H 2 PtCl 6 .6H 2 O), anhydrous tin tetrachloride (SnCl 4 ) in an ethanol solution at 60°C for 2 hours, and then dry the soaked sample in an oven at 110°C for 4 hours. The raw materials used are of high purity. The dried samples were calcined at 600°C for 4 hours in a muffle furnace, and then reduced by hydrogen at 500°C for 2 hours. Before the prepared sample was used in the catalytic dehydrogenation reaction, it was treated with water vapor at 500°C for 2 hours to obtain catalyst B, which was ground into 40-60 mesh particles for catalyst evaluation. The loading of Pt in the catalyst B is 0.1% of the catalyst weight, the loading of Sn is 0.2% of the catalyst weight, and the catalyst also contains 80ppm of Hg, 60ppm of Pb and 50ppm of Ti in terms of mass fraction.

Embodiment 3

[0030] Weigh an appropriate amount of MgAl 2 o 4 Carrier, added to containing appropriate amount of chloroplatinic acid (H 2 PtCl 6 .6H 2 O), anhydrous tin tetrachloride (SnCl 4 ) in a mixed aqueous solution at 10°C for 24 hours, and then the soaked sample was dried in an oven at 90°C for 24 hours. The raw materials used are of high purity. The dried samples were calcined at 400°C for 24 hours in a muffle furnace, and then reduced by hydrogen at 400°C for 10 hours. Before the prepared sample was used in the catalytic dehydrogenation reaction, it was treated with water vapor at 500°C for 2 hours to obtain catalyst C, which was ground into 40-60 mesh particles for catalyst evaluation. The loading amount of Pt in the catalyst C is 0.8% of the catalyst weight, the loading amount of Sn is 1.0% of the catalyst weight, and the catalyst also contains Hg240ppm, Pb200ppm and Ti150ppm in mass fraction.

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Abstract

The invention relates to a catalyst used for preparing low-carbon alkene by dehydrogenation of low-carbon alkane and a process method of the catalyst, and mainly solves problems that in a current catalyst which is used for preparing the low-carbon alkene by dehydrogenation of the low-carbon alkane, alkene selectivity is low, carbon deposit is serious, and single-way stability is poor under a high-temperature condition. According to the invention, the catalyst used for preparing the low-carbon alkene by dehydrogenation of the low-carbon alkane and the process method of the catalyst are adopted,wherein the catalyst uses Pt, Sn and I B group elements as active ingredients and auxiliary agents, a Hg element mass content in the catalyst is less than 900ppm, the Pb element mass content is lessthan 900ppm, and the Ti element mass content is less than 900ppm, through the above technical scheme, the problems are better solved, the low-carbon alkene is prepared in a high-efficiency and stablemanner, and the catalyst can be used in industrial production of preparing the low-carbon alkene by dehydrogenation of the low-carbon alkane.

Description

technical field [0001] The invention relates to a catalyst for preparing low-carbon olefins by dehydrogenating low-carbon alkanes and a process method thereof. Background technique [0002] Low-carbon olefins are important organic chemical raw materials and have a wide range of industrial applications. Low-carbon olefins are widely used in the production of plastics, synthetic rubber, drugs, gasoline additives, ion exchange resins, detergents, fragrances and various chemical intermediates. With the development of the chemical industry, the demand for low-carbon olefins is growing rapidly. The development of the process of preparing low-carbon alkanes from low-value-added alkanes is of great significance for making full use of low-carbon alkanes resources and opening up new sources of alkenes. Propylene / isobutene mainly comes from the steam cracking of naphtha and liquefied petroleum gas and the co-production or by-product of the fluid catalytic cracking process in refineries...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62B01J23/63C07C5/333C07C11/06C07C11/09
CPCY02P20/52
Inventor 曾铁强缪长喜吴文海姜冬宇樊志贵
Owner CHINA PETROLEUM & CHEM CORP
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