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Method for preparing silicon modified ZSM-5 molecular sieve catalyst, catalyst prepared by using method and application of catalyst

A ZSM-5, molecular sieve technology, applied in the field of methanol to olefin catalyst and its preparation, can solve the problem of low economy and so on

Inactive Publication Date: 2014-10-01
SHANGHAI BI KE CLEAN ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalyst can be used to carry out the reaction on a fixed bed reaction device, the reaction temperature is 400-550°C, the reaction pressure is 0.1-0.5MPa, and the space velocity is 0.25-2 hours -1 Under the reaction conditions, although the yield of propylene is significantly higher than that of ethylene, there are more than 20% C in the product 5 The above hydrocarbon products lead to low economic efficiency

Method used

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  • Method for preparing silicon modified ZSM-5 molecular sieve catalyst, catalyst prepared by using method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The calculated amount of Si(OCH 4 ) 4 Mix uniformly with n-hexane to prepare a precursor solution, add ZSM-5 molecular sieve with a silicon-to-aluminum ratio of 110 to the precursor solution, and form a suspension under stirring conditions. The liquid-solid mass ratio of the precursor solution to the ZSM-5 molecular sieve is 10, and Si(OCH 4 ) 4 The ratio to ZSM-5 molecular sieve is 1.5 mL / g. The suspension was stirred at room temperature for 6 hours, and then the temperature was raised to 40°C, and the n-hexane solvent was evaporated to dryness while stirring. The solid obtained by the evaporation to dryness was dried at 110°C for 9 hours, then transferred to a muffle furnace, and calcined in an air atmosphere at 600°C for 18 hours.

[0050] The solid powder obtained by roasting is spray-dried through the following steps: the roasted solid powder, alkaline silica sol, kaolin, pseudo-boehmite and deionized water are mixed in a weight ratio of 1:1:1.5:0.16:2.4 , Make a slu...

Embodiment 2

[0052] Will calculate the amount of Si(OC 2 H 5 ) 4 Mix uniformly with n-hexane to prepare a precursor solution, add ZSM-5 molecular sieve with a silicon-to-aluminum ratio of 400 to the precursor solution, and form a suspension under stirring conditions. The liquid-solid mass ratio of the precursor solution to the ZSM-5 molecular sieve is 5, Si(OC 2 H 5 ) 4 The ratio relative to ZSM-5 molecular sieve is 0.15mL / g. The suspension was stirred at room temperature for 6 hours, then the temperature was raised to 70°C, and the n-hexane solvent was evaporated to dryness while stirring. The solid obtained by the evaporation to dryness was dried at 110°C for 4 hours, then transferred to a muffle furnace, and calcined in an air atmosphere at 500°C for 8 hours.

[0053] The solid powder obtained by calcination is extruded by the following steps: the solid powder after calcination, pseudo-boehmite and sesbania powder are mixed uniformly according to the weight ratio of 4:1:0.5, put into the k...

Embodiment 3

[0055] Will calculate the amount of SiCl 4 Mix uniformly with n-hexane to prepare a precursor solution, add ZSM-5 molecular sieve with a silicon to aluminum ratio of 350 to the precursor solution, and form a suspension under stirring conditions. The liquid-solid mass ratio of the precursor solution to the ZSM-5 molecular sieve is 8, SiCl 4 The ratio to ZSM-5 molecular sieve is 0.25 mL / g. The suspension was stirred at room temperature for 12 hours, then the temperature was raised to 50°C, and the n-hexane solvent was evaporated to dryness while stirring. The solid obtained by the evaporation to dryness was dried at 110°C for 7 hours, then transferred to a muffle furnace, and calcined in an air atmosphere at 550°C for 6 hours.

[0056] The solid powder obtained by calcination is extruded through the following steps: the solid powder after calcination, pseudo-boehmite and methyl cellulose are mixed uniformly in a weight ratio of 3.5:1:0.3, put into a kneader, and passed Add 3% dilu...

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Abstract

The invention provides a method for preparing a silicon modified ZSM-5 molecular sieve catalyst. The method comprises the following steps: (1) dissolving a silicon source in a solvent so as to prepare a precursor solution; (2) adding a ZSM-5 molecular sieve into the precursor solution so as to form a suspension; (3) rising the temperature in a stirring state, and evaporating the suspension to be dry to obtain a solid, and then drying and baking the solid obtained by evaporation; and (4) carrying out extrusion molding or spray drying on baked solid powder. The invention also provides the silicon modified ZSM-5 molecular sieve catalyst and a method for preparing olefin from methyl alcohol in the existence of the catalyst. The catalyst prepared by adopting the method can obtain obviously improved selectivity on C3 and C4 olefin.

Description

Technical field [0001] The invention relates to the technical field of chemical heterogeneous catalysis, in particular to a methanol-to-olefin catalyst with high selectivity of propylene and C4 olefins, and a preparation method and application thereof. Background technique [0002] Propylene and butene are very important chemical raw materials. The industrial demand for these two olefins is very large on a global scale. Due to the rapid development of downstream products, the gap between supply and demand has been widened year by year, and prices have continued to rise, far higher than the price of ethylene. At present, the main sources of propylene and butene are steam cracking and catalytic cracking of petroleum. However, with the increasingly tight supply of petroleum resources, the cost of these two olefin products is increasing year by year, and the output is often not guaranteed. Therefore, people are pressing It is hoped that a new process using alternative raw materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C1/20C07C11/06C07C11/08
CPCC10G2/00B01J29/40B01J37/0009B01J37/0045B01J37/28B01J2229/32B01J2229/42C07C1/20C07C2529/40C10G2400/20Y02P20/52
Inventor 张帆王义君芮果甘永胜张小莽
Owner SHANGHAI BI KE CLEAN ENERGY TECH
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