Preparation method of catalyst for producing propylene by propane dehydrogenation under carbon dioxide atmosphere

A technology for dehydrogenation of carbon dioxide and propane, used in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, dehydrogenation to hydrocarbons, etc. In order to achieve the effect of low cost, good stability and high propylene yield

Inactive Publication Date: 2012-09-05
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Ga 2 o 3 and Ga 2 o 3 / TiO 2 It is considered to be a better catalyst (K.Nakagawa et al, Chem.Commun.1998, 1025; K.Nakagawa et al, J.Catal., 2001, 203 , 87; P.Michorezyk et al, Appl.Catal.A, 2003, 251, 425), they have higher reactivity, but the stability of these catalysts is very poor, can not be industrialized
It has been reported in the literature that a catalyst with high silicon-aluminum ratio HZSM-5 zeolite as the carrier and gallium oxide as the active component (Chinese patent ZL 200510025506.9) has good activity and high Stability, but gallium oxide itself is expensive, and the yield of propylene needs to be further improved
Therefore, the lack of catalysts with low price and good performance is the main problem in the field of oxidative dehydrogenation of propane carbon dioxide to produce propylene.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Zn(NO 3 ) 2 Dissolve in water to prepare solution, Zn 2+ The ion concentration is 0.002g / mL, and the HZSM-5 zeolite with a silicon to aluminum ratio of 150 is added to the above Zn(NO 3 ) 2 In the solution, mix evenly to form a suspension. The liquid-to-solid ratio is 21.14mL / g when added. The suspension is heated and stirred under an infrared lamp to evaporate to dryness, dried at 90°C for 18 hours, and baked at 600°C for 7 hours in an air atmosphere , To obtain catalyst-1, wherein the active component zinc oxide loading is 5wt%. The reaction activity of propane dehydrogenation under a carbon dioxide atmosphere was measured on a continuous micro-reactor. The specific reaction conditions are as follows: the amount of catalyst is 0.2g, the reaction pressure is 1atm, the total flow of reactant gas is 20mL / min, of which the flow of propane is 0.5mL / min, the flow of carbon dioxide is 1mL / min, and the rest is high-purity nitrogen. Activate at 600°C for 2 hours, and the reacti...

Embodiment 2

[0023] Use the method of Example 1 to determine the CO content of Catalyst-1 2 The stability of the propane dehydrogenation reaction under the atmosphere, after 30 hours of reaction, the propylene yield was 25.8%, and the propylene selectivity was 62.1%.

Embodiment 3

[0025] ZnCl 2 Dissolve in water to prepare solution, Zn 2+ The ion concentration is 0.002g / mL, and the HZSM-5 zeolite with a silicon to aluminum ratio of 100 is added to the above ZnCl 2 In the solution, mix uniformly to form a suspension. The liquid-to-solid ratio is 21.14mL / g when added. The suspension is heated and stirred under an infrared lamp to evaporate to dryness, dried at 110°C for 24 hours, and baked at 650°C for 4 hours in an air atmosphere , To obtain catalyst-2, wherein the active component zinc oxide loading is 5wt%. Use the method of Example 1 to determine its CO 2 Propane dehydrogenation activity in atmosphere. In the steady state, the propylene yield on Catalyst-2 was 23.2%, and the propylene selectivity was 40.3%.

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PUM

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Abstract

The invention belongs to the technical field of catalysts, in particular to a preparation method of a catalyst for producing propylene by propane dehydrogenation under the carbon dioxide atmosphere and an application thereof. The preparation method can overcome the shortcomings of low activity, poor stability, high price and the like of the existing catalyst. An HZSM-5 zeolite with high silicon-aluminum ratio is taken as a carrier, zinc oxide is taken as an active component, the impregnation method in the prior art is adopted for preparing the catalyst, the prepration process is simple convenient, and the cost is low. When the catalyst is used for the reaction for producing the propylene by the propane dehydrogenation under the carbon dioxide atmosphere has the advantages of low price, simple process, high reaction activity, high yield of the propylene, good stability, slow inactivation and the like.

Description

Technical field [0001] The invention belongs to the technical field of catalysts, and specifically relates to a preparation method and application of a catalyst for preparing propylene from propane dehydrogenation under a carbon dioxide atmosphere. Background technique [0002] Propylene is an important chemical raw material, which can be used to synthesize materials such as polypropylene, polyacrylonitrile, acrolein, acrylic acid and propylene oxide, and can also be used to produce plastic, polypropylene, plexiglass, epoxy resin and other products. Therefore, the world's demand for propylene is very large, and the propylene produced by traditional petroleum steam cracking and catalytic cracking methods is far from being able to meet the rapidly growing market demand. With the increasing shortage of petroleum resources, the use of abundant and cheap propane dehydrogenation to produce propylene has attracted more and more attention. [0003] Although the pure dehydrogenation of pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/06B01J29/40C07C11/06C07C5/32
CPCY02P20/52
Inventor 任英杰乐英红华伟明高滋
Owner FUDAN UNIV
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