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Catalyst with shape selecting function

A catalyst and functional technology, which is applied in the field of catalysts with shape-selective function, can solve the problems of difficulty in realizing the shape-selective function and low catalyst activity, and achieve the effect of good technical effect.

Active Publication Date: 2012-05-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the ubiquitous shape-selective function of shape-selective catalysts is difficult to realize. Molecular sieves must be modified to have the shape-selective function, and the catalyst activity after modification is low. To provide a new shape-selective Functional Catalyst

Method used

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  • Catalyst with shape selecting function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dissolve 110 milliliters of n-butylamine in 480 milliliters of deionized water and stir evenly, add 320 grams of mordenite raw powder into this surface modifier solution, heat up to 30°C under stirring and keep it for 120 hours, filter and dry at 100°C After drying in the air atmosphere, the treated mordenite powder is obtained. 124 grams of water glass, 1 gram of aluminum sulfate, 18 grams of sodium chloride, 6 milliliters of sulfuric acid, 20 milliliters of ethylamine, 10 milliliters of ammonia water and 600 milliliters of water are evenly gelled to obtain the ZSM-5 zeolite molecular sieve synthesis system. Add 320 grams of processed mordenite powder into the gelling solution and stir for 2 hours. The mixed system was transferred into a polytetrafluoroethylene-lined stainless steel crystallization kettle, and statically crystallized in an oven at 120°C for 48 hours. The XRD pattern of the sample has the characteristic diffraction peaks of both mordenite and ZSM-5 zeo...

Embodiment 2

[0023] Mordenite raw powder (SiO 2 / Al 2 o 3 =15) After soaking in the modifying agent solution, secondary growth in pure silicon ZSM-5 synthesis system to obtain mordenite / ZSM-5 core-shell molecular sieve material. The XRD pattern of the sample has the characteristic diffraction peaks of both mordenite and ZSM-5 zeolite molecular sieve, and it can be calculated that the phase content of ZSM-5 accounts for more than 30%. In the SEM image, fine particles are evenly distributed on the outer surface of the shuttle-shaped mordenite, and the diameter of these fine particles is about 50 nanometers. The fine particles of ZSM-5 form a continuous shell layer on the outer surface of the mordenite. After analyzing the core-shell SiO on the outer surface of the type molecular sieve 2 / Al 2 o 3 Molar ratio greater than 1000, can be regarded as a pure silicon structure. Denoted as molecular sieve material II.

Embodiment 3

[0025] ZSM-5 raw powder (SiO 2 / Al 2 o 3 =38) After soaking in the modifier solution, in the high silicon-aluminum ratio ZSM-5 synthesis system (SiO 2 / Al 2 o 3 =400) secondary growth to obtain ZSM-5 / ZSM-5 core-shell molecular sieve material. There are only characteristic diffraction peaks of ZSM-5 in the XRD pattern. In the SEM picture, on the outer surface of ZSM-5 zeolite, fine particles are uniformly distributed, and the diameter of these fine particles is about 30 nanometers. The fine particles of ZSM-5 form a continuous shell on the outer surface of the core phase ZSM-5. After analysis The SiO on the outer surface of this core-shell molecular sieve 2 / Al 2 o 3 Molar ratio The molar ratio was 342. Denoted as molecular sieve material III.

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Abstract

The invention relates to a catalyst with shape selecting function, which mainly solves the problems that the shape selecting function of the conventional shape selective catalyst is difficult to realize, the molecular sieve has the shape selecting function after modifying and the modified catalyst has lower activity. The catalyst with the shape selecting function comprises the following components in part by weight: a) 5 to 95 parts of core-shell molecular sieve material and b) 5 to 95 parts of adhesive, wherein the core phase of the core-shell molecular sieve is selected from ZSM-5, ZSM-11, ZSM-35, ZSM-48, beta, mordenite, MCM-22 and phosphorus-aluminum molecular sieve; and the technical scheme that the core-shell molecular sieve is continuous and compact ZSM-5 crystalline grains well solves the problems. The catalyst can be used in industrial production of methylbenzene selective disproportionation and methylbenzene methylation.

Description

technical field [0001] The present invention relates to a catalyst with shape-selective function, more specifically, the present invention relates to a catalyst with shape-selective function, which uses a core-shell molecular sieve with a high silicon-aluminum ratio or a pure silicon shell as the main active ingredient . Background technique [0002] Zeolite molecular sieves contain regular nanopores and adjustable acidity. Since the 1960s, they have been widely used in petroleum refining and chemical industries, such as catalytic cracking, catalytic reforming, disproportionation, transalkylation, isomerization and Alkylation and other catalytic reactions. With the continuous development of zeolite catalytic technology, people put forward higher and higher requirements for the catalytic performance of zeolite molecular sieve catalysts. Shape-selective catalysis is a concept first proposed by Weisz and Frilette in the process of studying the catalytic reaction of small-pore...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80B01J29/40B01J35/02C07C5/27C07C15/02B01J35/00
CPCY02P20/52
Inventor 孔德金郑均林李为邹薇
Owner CHINA PETROLEUM & CHEM CORP