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

A technology for the dehydrogenation of carbon dioxide and propane, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, dehydrogenation to hydrocarbons, etc., and can solve the problems of expensive gallium oxide, poor catalyst stability, propylene Improve the efficiency and other issues, to achieve the effect of low cost, good stability, high yield of propylene

Inactive Publication Date: 2010-07-28
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 a solution, Zn2+ ion concentration is 0.002g / mL, and the HZSM-5 zeolite with a silicon-aluminum ratio of 150 is added to the above-mentioned Zn(NO 3 ) 2 In the solution, mix evenly to form a suspension, the liquid-solid ratio is 21.14mL / g when adding, put the suspension under infrared lamp, heat, stir and evaporate to dryness, dry at 90°C for 18 hours, and roast at 600°C in air atmosphere for 7 hours , to obtain Catalyst-1, wherein the loading of active component zinc oxide is 5wt%. The reactivity of propane dehydrogenation under carbon dioxide atmosphere was determined in a continuous microreactor. The specific reaction conditions are as follows: the amount of catalyst is 0.2g, the reaction pressure is 1atm, the total flow rate of reaction gas is 20mL / min, wherein the flow rate of propane is 0.5mL / min, the flow rate of carbon dioxide is 1mL / min, and the rest is high-purity nitrogen. Activation at 600°C for 2 hours, and the r...

Embodiment 2

[0023] Utilize the method for example 1 to measure catalyst-1 in CO 2 The stability of the propane dehydrogenation reaction under the atmosphere, after 30 hours of reaction, the yield of propylene was 25.8%, and the selectivity of propylene was 62.1%.

Embodiment 3

[0025] ZnCl 2 Soluble in water to make solution, Zn 2+ The ion concentration is 0.002g / mL, and the HZSM-5 zeolite with a silicon aluminum ratio of 100 is added to the above ZnCl 2 In the solution, mix evenly to form a suspension, the liquid-solid ratio is 21.14mL / g when adding, heat and stir the suspension under an infrared lamp, evaporate to dryness, dry at 110°C for 24 hours, and roast at 650°C in air atmosphere for 4 hours , to obtain Catalyst-2, wherein the loading of active component zinc oxide is 5wt%. Utilize the method of example 1 to measure its CO 2 Propane dehydrogenation activity under atmosphere. At 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 in particular relates to a preparation method and application of a catalyst for propane dehydrogenation to propylene 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, as well as to produce plastics, polypropylene fiber, organic glass, 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 meeting the rapidly growing market demand. With the increasing shortage of petroleum resources, the use of abundant and cheap propane dehydrogenation to propylene has attracted more and more attention. [0003] Although the pure dehydrogenation of propane to propylene has b...

Claims

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Application Information

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Patent Type & Authority Applications(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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