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Composite molecular sieve catalyst for methanol to gasoline and preparation method thereof

A compound molecular sieve and methanol-to-gasoline technology, applied in the field of catalysis, can solve the problems of expensive raw materials, unsuitable for industrialization, decreased mechanical strength of molecular sieve catalysts, etc., and achieve the effects of improving mesoporous specific surface area, improving performance and improving mechanical strength.

Inactive Publication Date: 2017-07-14
MAISEN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned published patents, the ZSM-5 molecular sieve is post-treated with inorganic alkali or TPAOH to form a multi-level porous molecular sieve, but the mechanical strength of the molecular sieve catalyst after the treatment is seriously reduced, and some of these processes are at the expense of micropores. Some raw materials are too expensive and not suitable for industrialization

Method used

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  • Composite molecular sieve catalyst for methanol to gasoline and preparation method thereof
  • Composite molecular sieve catalyst for methanol to gasoline and preparation method thereof
  • Composite molecular sieve catalyst for methanol to gasoline and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0026] The mass ratio of embodiment 1-3 ZSM-5 molecular sieve and NaY molecular sieve

[0027] a. Weigh ZSM-5 molecular sieve (silicon-aluminum ratio 26.87, BET specific surface area 364 m 2 / g, micropore specific surface area 298 m 2 / g, the mesopore specific surface area is 66 m 2 / g) and NaY molecular sieve (silicon-aluminum ratio 3.28, BET specific surface area 703m 2 / g, micropore specific surface area 598 m 2 / g, mesopore specific surface area 105 m 2 / g), added to the mixed alkali aqueous solution of tetrapropylammonium bromide and sodium hydroxide, (ZSM-5 molecular sieve + NaY molecular sieve), tetrapropyl quaternary ammonium salt, inorganic alkali and water mass ratio is 50:135 :40:1000, stirred evenly at room temperature, put into a sealed reaction kettle, reacted for 48 hours at a temperature of 170° C. and autogenous pressure, and obtained an alkali-treated composite molecular sieve;

[0028] b. Filtrating, washing, and drying the alkali-treated composite mole...

Embodiment 4~9

[0035] Examples 4-9 (ZSM-5 molecular sieve+NaY molecular sieve), tetrapropylammonium bromide, sodium hydroxide and water in different mass ratios

[0036] Catalyst is prepared by the method for embodiment 2, and difference with embodiment 2 is only to change (ZSM-5 molecular sieve+NaY molecular sieve), the mass proportion of tetrapropyl ammonium bromide, sodium hydroxide and water, and embodiment The comparison results of 2 are shown in Table 2.

[0037] Table 2 (ZSM-5 molecular sieve + NaY molecular sieve), tetrapropylammonium bromide, sodium hydroxide and water catalyst data in different mass ratios

[0038]

[0039] If the concentration of the mixed alkali aqueous solution is too small, a certain alkali treatment effect cannot be achieved, and the number of mesopores formed is too small; if the concentration is too high, the pore structure of the original molecular sieve will easily collapse.

[0040] As can be seen from the above table, the mass ratio (ZSM-5 molecular si...

Embodiment 10~16

[0041] Embodiment 10~16 different mixed alkaline aqueous solutions

[0042] Catalyst is prepared by the method for embodiment 2, and difference with embodiment 2 is only to change the kind of tetrapropyl quaternary ammonium salt and inorganic base in the mixed alkali, and the comparative result of embodiment 2 is shown in table 3.

[0043] Table 3 Catalyst data prepared by different mixed alkali aqueous solutions

[0044]

[0045] It can be seen from the above table that when tetrapropylammonium bromide and sodium hydroxide are selected as the mixed base, the obtained multi-order molecular sieve has the best channel distribution, the highest gasoline yield and the longest service life of the catalyst.

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Abstract

The present invention provides a composite molecular sieve catalyst for preparation of gasoline from methanol and a preparation method thereof. The method is as follows: ZSM-5 molecular sieve and NaY molecular sieve are added into a tetrapropyl quaternary ammonium salt and inorganic base mixed aqueous alkali solution for high-temperature reaction, filtration and roasting to make a much-level molecular sieve, and the composite molecular sieve catalyst can be obtained by hydrogen type replacement of the much-level molecular sieve and an ammonium nitrate solution and extruding forming with a binder which is added with a strength aid. The preparation method is simple and low- cost, and the catalyst for the reaction of preparation of gasoline from methanol has high gasoline yield, high catalyst mechanical strength, long life and other advantages.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and relates to a catalyst and a preparation method thereof, in particular to a composite molecular sieve catalyst for methanol-to-gasoline and a preparation method thereof. Background technique [0002] Gasoline is one of the most used light petroleum products and is an important fuel for automobile engines. Due to the rapid development of the national economy, the demand for gasoline in my country has increased sharply, and the quality requirements have been continuously improved. The production and quality improvement of gasoline has become an urgent problem to be solved. Gasoline production methods mainly include coal direct liquefaction, coal indirect liquefaction, and methanol-to-gasoline (MTG). Among them, the oil products of coal direct liquefaction and coal indirect liquefaction methods need hydrogenation and upgrading, and the tail gas treatment process is complicated, while the oil pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80B01J35/10C10G3/00
CPCY02P20/52Y02P30/20
Inventor 卢赤杰张向京马仁娟张丽喆刘玉敏陶然陈国刚张清洁胡永琪
Owner MAISEN ENERGY TECH CO LTD
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