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Preparation method of zn-zsm-5 and its application in propane dehydrogenation to propylene

A propane dehydrogenation, zn-zsm-5 technology, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of high production cost, large amount of template agent, low utilization rate of reactor, etc. Achieve the effects of low pollution, low consumption, and obvious social and economic benefits

Inactive Publication Date: 2017-02-22
DALIAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of template agent used in this method is large, the utilization rate of the reactor is low, and the production cost is high.
So far, tetrapropylammonium hydroxide is still considered to be the best template for the synthesis of Zn-ZSM-5 molecular sieves. The production cost is high, and the utilization rate of the reactor is low. Taking a 1L reactor as an example, the traditional hydrothermal synthesis can synthesize about 57.7g of ZSM-5 molecular sieve products

Method used

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  • Preparation method of zn-zsm-5 and its application in propane dehydrogenation to propylene
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  • Preparation method of zn-zsm-5 and its application in propane dehydrogenation to propylene

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Embodiment 1

[0037] Zinc nitrate, tetraethyl orthosilicate, water and hydrochloric acid are mixed according to the molar ratio of 0.00368: 1: 20: 0.2, stirred to form a homogeneous solution, then an aerosol is generated by an aerosol generator, and zinc silicon oxide is obtained by drying, Put 1g of zinc silicon oxide into a 1.67ml stainless steel synthesis kettle with polytetrafluoroethylene lining, and then add 1.34g of tetrapropylammonium hydroxide aqueous solution (mass fraction 25%), wherein tetrapropylammonium hydroxide and zinc silicon SiO in oxide 2 The molar ratio is 0.1: 1, sealed at 170°C for crystallization reaction for 72h, the obtained solid product is dried at 100°C and then roasted at 540°C for 6h to remove the template agent, and the final product 0.5wt% Zn-ZSM- 5 Catalyst 0.95g. Equivalent to 1L crystallization kettle can produce 569g Zn-ZSM-5. The XRD pattern of this product is shown in figure 1 , it can be seen that there are five diffraction peaks at 2theta of 7.9°,...

Embodiment 2

[0039] 1) Mix zinc nitrate, tetraethyl orthosilicate, water and hydrochloric acid according to the molar ratio of 0.02272: 1: 20: 0.2, stir to form a homogeneous solution, then generate an aerosol through an aerosol generator, and dry to obtain zinc-silicon oxide Put 1g of zinc silicon oxide into 1.67ml stainless steel synthetic kettle with polytetrafluoroethylene lining, then add 1.34g of tetrapropylammonium hydroxide aqueous solution (mass fraction 25%), wherein tetrapropylammonium hydroxide and SiO in Zinc Silicon Oxide 2 The molar ratio is 0.1: 1, sealed at 170°C for crystallization reaction for 72h, the resulting solid product is dried at 100°C and then roasted at 540°C for 6h to remove the template agent, and the final product 3wt% Zn-ZSM-5 catalyst. The XRD pattern of this product is shown in figure 2 , it can be seen that there are five diffraction peaks at 2theta of 7.9°, 8.8°, 23°, 23.9°, and 24.4° on the XRD spectrum, which are characteristic diffraction peaks of...

Embodiment 3

[0043] 1) Mix zinc nitrate, tetraethyl orthosilicate, water and hydrochloric acid according to the molar ratio of 0.03872: 1: 20: 0.2 and stir for 1 hour to form a homogeneous solution, then generate an aerosol through an aerosol generator, and dry to obtain zinc silicon Oxide, 1g of zinc silicon oxide was put into 1.67ml stainless steel synthetic kettle with polytetrafluoroethylene lining, and then added 1.34g of tetrapropylammonium hydroxide (mass fraction 25%), wherein tetrapropylammonium hydroxide and SiO in Zinc Silicon Oxide 2 The molar ratio is 0.1: 1, sealed at 170°C for crystallization reaction for 72h, the resulting solid product is dried at 100°C and then roasted at 540°C for 6h to remove the template agent, and the final product 5wt% Zn-ZSM-5 catalyst. The XRD pattern of this product is shown in Figure 4 , it can be seen that there are five diffraction peaks at 2theta of 7.9°, 8.8°, 23°, 23.9°, and 24.4° on the XRD spectrum, which are characteristic diffraction ...

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Abstract

The invention relates to a preparation method of Zn-ZSM-5 and an application of Zn-ZSM-5 in preparing propylene via propane dehydrogenation. A Pt based catalyst is widely applied to prepare propylene via the propane dehydrogenation, but the catalyst causes severe carbon deposition under a high temperature condition, and is poor in stability and high in production cost. In order to solve the above technical problems, the invention provides a method of crystallizing and synthesizing a Zn-ZSM-5 catalyst by obtaining a molecular sieve precursor by an aerosol assistance method and taking tetrapropylammonium hydroxide as a template. The invention further provides a new application of the Zn-ZSM-5 catalyst in preparing propylene via the propane dehydrogenation. The catalyst has a simple synthesis process, the dosage of the template is low, the pollution is small, the productivity and a single-kettle utilization rate are high, the energy consumption and cost are low, and synthesized Zn-ZSM-5 has a relatively high propane conversion rate, propylene selectivity and reaction stability and has obvious social and economic benefits.

Description

technical field [0001] The invention relates to a catalyst preparation method and its application, in particular to a Zn-ZSM-5 preparation method and its application in propane dehydrogenation to propylene. Background technique [0002] Propylene is an important organic chemical raw material second only to ethylene, and is widely used in the production of polypropylene, isopropanol, carbonyl alcohol, acrylonitrile, etc. At present, the growth rate of my country's demand for propylene has far exceeded that of ethylene. Propylene is mainly derived from traditional processes such as petroleum catalytic cracking and naphtha reforming. However, due to the shortage of global oil resources, the traditional process is far from meeting the actual production requirements. Therefore, the research on propane catalytic dehydrogenation process has been paid more attention. [0003] The reaction of propane dehydrogenation to propylene is carried out under the conditions of high temperatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40C07C5/333C07C11/06
CPCY02P20/52
Inventor 熊光于世强郭振东
Owner DALIAN UNIV OF TECH
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