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Molecular sieve catalyst for preparing propylene by propane dehydrogenation and preparation method of molecular sieve catalyst

A propane dehydrogenation and molecular sieve technology, which is applied to molecular sieve catalysts, including molecular sieve catalysts, catalysts, etc., can solve the problems of high price, increased production cost, and limited wide application, and achieves low-cost service life, improved service life, and high raw material conversion rate effect

Inactive Publication Date: 2019-04-26
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the performance of the Pt-based noble metal catalyst is excellent, due to its high price, the catalyst needs to be replaced regularly, which greatly increases the production cost.
It can be seen that the two mainstream propane dehydrogenation catalysts have certain limitations, which limit their wide application, and it is necessary to develop non-toxic and cheap propane dehydrogenation catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weighing 27.1g tetraethyl silicate (TEOS), 38.4g mass fraction is 25% tetrapropylammonium hydroxide (TPAOH) aqueous solution, 0.47g SnCl 4 and 20g H 2 O was placed in a 200mL beaker, stirred at room temperature for 6h until the hydrolysis was complete, and 16g H 2 After O, the solution was placed in a 200mL reactor, and reacted at 170°C for 72h, then suction filtered, dried, and roasted to obtain the catalyst.

[0023] In the fixed-bed tubular reactor filled with 1g of the catalyst prepared in Example 1, dehydrogenation reaction is carried out with propane as reactant, the reaction temperature is 630°C, the reaction pressure is normal pressure, and the propane weight hourly space velocity is 3.5h -1 Under the conditions, the conversion rate of propane is 32%, and the selectivity of propylene is 90%.

Embodiment 2

[0025] 27.1g tetraethyl silicate (TEOS), 38.4g mass fraction is 25% tetrapropylammonium hydroxide (TPAOH) aqueous solution, 0.46g Ga(NO 3 ) 3 and 20g H 2 O was placed in a 200mL beaker, stirred at room temperature for 6h until the hydrolysis was complete, and 16g H 2 After O, the solution was placed in a 200mL reactor, and reacted at 170°C for 72h, then suction filtered, dried, and roasted to obtain the catalyst.

[0026] In a fixed-bed tubular reactor filled with 1 g of the catalyst prepared in Example 2, dehydrogenation reaction was carried out with propane as a reactant, the reaction temperature was 630°C, the reaction pressure was normal pressure, and the propane weight hourly space velocity was 3.5h -1 Under the conditions, the conversion of propane was 28%, and the selectivity of propylene was 89%.

Embodiment 3

[0028] 0.33g of NaAlO 2 Dissolve in 41.4g of water, add 12.5g of hexamethyleneamine (HMI) and Fe(NO 3 ) 3 9H 2 O (the loading of Fe is 6wt%), after 20 min of reaction, boric acid (H 3 BO 3 ) 9.8g, continued to stir for 20min, then added 22.1g of JN-40 dropwise, the obtained initial gel was aged for 2h, then transferred into a polytetrafluoroethylene liner, and reacted at 170°C for 7d. After the reaction, cool, centrifuge, and wash with water until neutral. The obtained white solid was dried at 100° C., and then transferred to a muffle furnace for calcination at 600° C. for 10 h to obtain a catalyst.

[0029]In a fixed-bed tubular reactor filled with 1 g of the catalyst prepared in Example 3, dehydrogenation reaction was carried out with propane as a reactant, the reaction temperature was 630°C, the reaction pressure was normal pressure, and the propane weight hourly space velocity was 3.5h -1 Under certain conditions, the conversion of propane was 30%, and the selectivit...

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PUM

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Abstract

The invention discloses a molecular sieve catalyst for preparing propylene by propane dehydrogenation and a preparation method of the molecular sieve catalyst, and belongs to the field of preparationof catalysts. The catalyst consists of a component A and a component B, wherein the component A is one of metal elements Sn, Ga, Fe, Co, Ni or Zn, the use amount of the component A is 1-9wt% of the total amount of the catalyst, the component B is a molecular sieve carrier, and the use amount of the component B is 90-99wt% of the total amount of the catalyst. The preparation method of the catalystcomprises a direct hydrothermal synthesis method and an impregnation method. The high-performance alkane dehydrogenation catalyst is prepared by controlling the use amounts, the structures and the dispersity of active components, has the characteristics of simple preparation process, low price and no toxicity, and has the characteristics of good activity, high selectivity, high stability and the like when applied to preparation of propylene through propane dehydrogenation; and a new technical scheme is provided for development and preparation of a new-generation alkane dehydrogenation catalyst.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to a molecular sieve catalyst for propane dehydrogenation to propylene and a preparation method thereof. Background technique [0002] Propylene is an extremely important petrochemical basic raw material, its consumption is second only to ethylene, and it is widely used in the production of basic chemicals such as polypropylene, acrylonitrile, butanooctanol and acrylic acid. Driven by industries such as real estate, automobiles, packaging, textiles and clothing, the demand for propylene is strong, and its demand growth rate is about 1.5 times that of GDP. It is estimated that the global growth rate will be 3.8% in the next five years, and the domestic growth rate will be 5.2-7.2%. By 2020, global production and consumption will reach 120 million tons. There has always been a major gap in my country's propylene market. For a long time, it has been necessary to import ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/14B01J23/08B01J23/745B01J23/75B01J23/755B01J23/06B01J29/46B01J29/76B01J29/70B01J29/40C07C11/06C07C5/333
CPCB01J23/06B01J23/08B01J23/14B01J23/745B01J23/75B01J23/755B01J29/405B01J29/46B01J29/7057B01J29/7088B01J29/7615B01J29/7676B01J2229/183C07C5/3335C07C2523/06C07C2523/08C07C2523/14C07C2523/745C07C2523/75C07C2523/755C07C2529/40C07C2529/46C07C2529/70C07C2529/76C07C11/06Y02P20/52
Inventor 朱海波付静鲍晓军袁珮岳源源
Owner FUZHOU UNIV
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