Composite molecular sieve catalyst, preparation method and application thereof

A technology of composite molecular sieve and catalyst, which is applied in molecular sieve catalyst, catalyst activation/preparation, chemical instruments and methods, etc., can solve the problems of difficult acid control of catalyst and low xylene selectivity.

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problems existing in the prior art, such as the low selectivity of p-xylene in the methylation reaction of toluene and methanol, and th

Method used

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  • Composite molecular sieve catalyst, preparation method and application thereof
  • Composite molecular sieve catalyst, preparation method and application thereof
  • Composite molecular sieve catalyst, preparation method and application thereof

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preparation example Construction

[0048] According to one embodiment of the present invention, it relates to a preparation method of a composite molecular sieve catalyst, comprising the following steps:

[0049] Mix ZSM-48 molecular sieve, ZSM-11 molecular sieve, aluminum dihydrogen phosphate and forming aids evenly, then add alkaline earth metal salt solution, extrude, form, and then dry and roast to obtain composite molecular sieve catalyst.

[0050] In the above technical solution, the ZSM-48 molecular sieve, the ZSM-11 molecular sieve, and the aluminum dihydrogen phosphate are in a weight ratio of 40-60:9-46:14.9-27.

[0051] According to an embodiment of the present invention, in the preparation step, the kneading temperature is not particularly limited, and can be arbitrarily selected by those skilled in the art, but is generally 10-40°C, preferably 10-30°C.

[0052] According to an embodiment of the present invention, in the preparation step, the kneading time is not particularly limited, and can be arb...

Embodiment 1

[0069] The dry basis of 50g ammonium type ZSM-48 molecular sieve (SiO 2 / Al 2 O 3 Molar ratio of 120), dry basis 31g ammonium type ZSM-11 molecular sieve (SiO 2 / Al 2 O 3 The molar ratio is 200), 18.8g of aluminum dihydrogen phosphate and 4g of succulent powder are mixed uniformly in the kneader, and the magnesium nitrate solution with a weight concentration of 50% is added to the kneader and kneaded for 30 minutes to obtain a dough shape. A cylindrical bar with a diameter of 1.7 mm was dried at 120° C. and calcined in an air atmosphere at 550° C. to obtain catalyst A. The composition of catalyst A is shown in Table 1.

Embodiment 2

[0071] The dry basis of 40g ammonium type ZSM-48 molecular sieve (SiO 2 / Al 2 O 3 The molar ratio is 120), 41g dry basis of ammonium type ZSM-11 molecular sieve (SiO 2 / Al 2 O 3 The molar ratio is 200), 18.8g of aluminum dihydrogen phosphate and 4g of succulent powder are mixed uniformly in the kneader, and the magnesium nitrate solution with a weight concentration of 50% is added to the kneader and kneaded for 30 minutes to obtain a dough shape. A cylindrical bar with a diameter of 1.7 mm was dried at 120° C. and calcined in an air atmosphere at 550° C. to obtain catalyst B. The composition of catalyst B is shown in Table 1.

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Abstract

The invention relates to a composite molecular sieve catalyst as well as a preparation method and application thereof. The catalyst at least comprises (a) a ZSM-48 molecular sieve; (b) a ZSM-11 molecular sieve; (c) P2O5; and (d) an alkaline earth metal oxide. The invention also provides a preparation method of the composite molecular sieve catalyst, which comprises the following steps: uniformly mixing the ZSM-48 molecular sieve, the ZSM-11 molecular sieve, the aluminum dihydrogen phosphate and the molding aid, adding the alkaline earth metal salt solution, extruding, molding, drying and roasting to obtain the composite molecular sieve catalyst. When the composite molecular sieve catalyst is used for preparing p-xylene through toluene methanol methylation reaction, high p-xylene selectivity can be obtained while the high conversion rate is kept, and the composite molecular sieve catalyst can be used for industrial production of p-xylene.

Description

technical field [0001] The invention relates to a composite molecular sieve catalyst, a preparation method and an application thereof, in particular to a molecular sieve catalyst whose outer surface is covered with acid sites, a preparation method and an application thereof. Background technique [0002] In industrial production, the shape-selective disproportionation of toluene and the shape-selective methylation of toluene and methanol in the production of p-xylene use the sieving function of the ten-membered ring channel of ZSM-5 molecular sieve. However, with the deepening of research, it is found that it is difficult for a single molecular sieve to meet the needs of the reaction, taking into account the requirements of conversion efficiency and inhibition of side reactions to improve catalyst life. Therefore, the development of composite molecular sieve catalysts is a research direction that has attracted much attention in the field of industrial catalysis. For example,...

Claims

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Application Information

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IPC IPC(8): B01J29/80B01J37/08C07C15/08C07C2/86
CPCB01J29/80B01J37/08B01J37/088C07C2/864B01J29/40B01J29/703B01J2229/20B01J2229/40C07C15/08Y02P20/52
Inventor 李旭光祁晓岚孔德金石张平
Owner CHINA PETROLEUM & CHEM CORP
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