Catalyst with shape selecting function

A catalyst and function 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: 2010-06-09
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

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Experimental program
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Effect test

Embodiment 1

[0021] 110 ml of n-butylamine was dissolved in 480 ml of deionized water and stirred evenly. 320 g of mordenite powder was added to the surface modifier solution, heated to 30°C under stirring and kept for 120 hours, filtered and kept at 100°C After drying in an air atmosphere, processed 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 and 600 milliliters of water can be uniformly gelled to obtain a ZSM-5 zeolite molecular sieve synthesis system. Add 320 g of treated mordenite powder to the gel forming solution and stir for 2 hours. This mixed system is moved into a stainless steel crystallization kettle lined with polytetrafluoroethylene and statically crystallized in an oven at 120°C for 48 hours. The XRD pattern of the sample has both the characteristic diffraction peaks of mordenite and ZSM-5 zeolite molecular sieve. It can...

Embodiment 2

[0023] Mordenite powder (SiO 2 / Al 2 O 3 =15) After immersion in the modifier solution, secondary growth in the pure silicon ZSM-5 synthesis system to obtain the mordenite / ZSM-5 core-shell molecular sieve material. The XRD pattern of the sample has both the characteristic diffraction peaks of mordenite and ZSM-5 zeolite molecular sieve. It can be calculated that the phase content of ZSM-5 accounts for more than 30%. In the SEM image, fine particles are uniformly distributed on the outer surface of the spindle-shaped mordenite. The diameter of these fine particles is about 50 nanometers. The fine particles of ZSM-5 form a continuous shell on the outer surface of the mordenite. The core-shell is analyzed. SiO on the outer surface of molecular sieve 2 / Al 2 O 3 The molar ratio is greater than 1000, which can be regarded as a pure silicon structure. Marked 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 ZSM-5 synthesis system with high silicon to aluminum ratio (SiO 2 / Al 2 O 3 =400) ZSM-5 / ZSM-5 core-shell molecular sieve material is obtained by secondary growth. There are only characteristic diffraction peaks of ZSM-5 in the XRD pattern. In the SEM image, fine particles are uniformly distributed on the outer surface of ZSM-5 zeolite. The diameter of these fine particles is about 30 nanometers. The fine particles of ZSM-5 form a continuous shell layer on the outer surface of the core phase ZSM-5. The SiO on the outer surface of this core-shell molecular sieve 2 / Al 2 O 3 The molar ratio is 342. Marked 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 a shape-selective function. Furthermore, the present invention relates to a catalyst with a shape-selective function that uses a core-shell molecular sieve with a high silicon-to-aluminum ratio or a pure silicon-shell layer as the main active ingredient. . Background technique [0002] Zeolite molecular sieves contain regular nano-pores with 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 Catalytic reaction processes such as alkylation. With the continuous development of zeolite catalytic technology, people have 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 1960 when studying the catalytic reaction of ...

Claims

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Application Information

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