Molecular sieve catalyst and preparation method and application thereof

A molecular sieve and catalyst technology, which is applied in the field of molecular sieve catalyst and its preparation, can solve the problems of difficulty in normal operation of the device, shutdown and other problems, and achieve the effects of good activity and propylene selectivity.

Pending Publication Date: 2020-10-13
DATANG INT CHEM TECH RESINST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the MTP catalyst has been in the cycle of "reaction-coking deactivation-charcoal regeneration" throughout its life cycle; on the other hand, the process of converting methanol to propylene is a process of increasing the number of

Method used

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  • Molecular sieve catalyst and preparation method and application thereof
  • Molecular sieve catalyst and preparation method and application thereof
  • Molecular sieve catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh 10.0g of hydrogen-type ZSM-5 with a silicon-aluminum ratio of 200 (produced by Shanghai Fuxu Molecular Sieve Co., Ltd.), 2.0g of polycrystalline mullite fiber (Zhejiang Deqing Lanya Crystal Fiber Co., Ltd., with an average fiber diameter of 3 microns and a length of 150mm), sodium water glass 20.0g (Beijing Yongfei Adhesive Factory, SiO 2 content 26.0%, n=3.2), 1.0 g of scallop powder, after mixing evenly, extrusion molding. The molded product was dried in the shade at room temperature for 96 hours, and then dried at 80°C. The dried product was calcined at 550° C. for 5 hours to obtain a catalyst intermediate product.

[0042] Weigh 10.0 g of the above-mentioned catalyst intermediate product and add it into 80 mL of ammonium nitrate solution, exchange at a temperature of 80° C., and exchange for 3 times, each time for 8 hours. Then, the resulting product was filtered, followed by drying at 100°C. Then the dried product was calcined at 550° C. for 8 hours to obt...

Embodiment 2-7

[0044] Add a certain amount of hydrogen-type ZSM-5 raw powder with a silicon-aluminum ratio of 100-1000, add a certain amount of inorganic fiber, silicate binder, and molding aids, and extrude into a strip. The molded product was dried in the shade at room temperature for 72 hours, and then dried at 80°C. The dried product was calcined at 550° C. for 5 hours to obtain a catalyst intermediate product.

[0045]The above-mentioned catalyst intermediate product was added into the ammonium ion-containing solution, and exchanged three times at a temperature of 100° C., each time for 8 hours. Then, the resulting product was filtered, followed by drying at 100°C. Then the dried product was calcined at 550° C. for 8 hours to obtain the catalysts of Examples 2-8, and the various ingredients and contents are listed in Table 1.

[0046]

Embodiment 8

[0055] The catalyst reaction performance evaluation device of the present invention adopts a fixed-bed flow reactor, and the loading amount of catalyst for each evaluation is 3.0 g, with 50% by weight methanol-water as raw material, at 480 ° C, the liquid hourly space velocity is 1 h －1 , the total system pressure is less than 0.05MPa, the product is analyzed online by gas chromatography with HP-PLOT-Q column, and the product is finally normalized and expressed by the mass content of carbon base. In addition, in order to characterize the high-temperature anti-burst performance of the catalyst, the extruded catalyst was evaluated for its reaction performance for 500 hours and then tested for its strength and abrasion. The attrition of catalyst was measured in KM-4 particle abrasion tester (Suzhou Qile Electronic Technology Co., Ltd., 40r / min), and the strength test was carried out in YPD-300C tablet hardness tester (Shanghai Huanghai Drug Inspection Instrument Co., Ltd., catalys...

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Abstract

The invention provides a molecular sieve catalyst, which is prepared from the following components in parts by weight: 50 to 80 parts of a hydrogen type ZSM-5 molecular sieve, 1 to 10 parts of inorganic fibers and 5 to 40 parts of SiO2. The invention further provides a method for preparing the molecular sieve catalyst, which comprises the steps of (1) uniformly mixing a hydrogen type ZSM-5 molecular sieve, inorganic fibers, a precursor of a silicon dioxide adhesive and a forming additive, and then forming; (2) drying the intermediate product obtained in the step (1) in the shade at room temperature, then drying, and then roasting; (3) carrying out ammonium ion exchange on the intermediate product obtained in the step (2); and (4) drying the intermediate product obtained in the step (3), and roasting to obtain the molecular sieve catalyst. The invention also provides an application of the molecular sieve catalyst or the molecular sieve catalyst prepared by the method in preparation of propylene by methanol conversion. The catalyst provided by the invention has good activity and propylene selectivity, and also has high-temperature burst resistance.

Description

technical field [0001] The invention belongs to the technical field of catalysts. Specifically, the present invention relates to a molecular sieve catalyst and its preparation method and application. Background technique [0002] The process of producing methanol from coal or natural gas raw materials, and then converting methanol to propylene (MTP) is an important non-petroleum route to produce propylene. The MTP reaction is generally carried out under the catalyst of zeolite molecular sieve. At present, the more recognized reaction mechanism is "carbon pool mechanism". It is believed that the reaction process includes three key steps: methanol dehydration to generate dimethyl ether; CH 2 ) n Generate olefins; olefins are converted into aromatics and alkanes through processes such as polymerization, hydrogen transfer, alkylation, cracking, isomerization, and cyclization. Among them, the fixed-bed MTP process adopts ZSM-5 molecular sieve catalyst, the reaction temperatur...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J37/00B01J37/30C07C1/20C07C11/06
CPCB01J37/0009B01J37/30B01J29/40C07C1/20B01J2229/42C07C11/06Y02P20/52
Inventor 陈爱平陈元应赵宗凯梅长松李春启
Owner DATANG INT CHEM TECH RESINST
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