Catalyst for use in preparation of propylene by olefin cracking

A catalyst and olefin technology, which is applied to hydrocarbon cracking, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of low catalyst reactivity, weak anti-coking ability, low selectivity of target products, etc. Carbon deposition ability and stability, good technical effect, the effect of increasing the active center

Inactive Publication Date: 2011-05-25
王伟跃
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is that in the prior art, the catalytic activity of olefin cracking to produce propylene is low, the selectivity of the target product is not high, and the anti-coking ability is not strong, etc., and a new catalyst and its preparation method are provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0032] Mix 100 grams of ZSM-5 molecular sieve raw powder with a silicon-aluminum ratio (mole) of 60, 20 grams of silica sol, 10 grams of tetraethylammonium hydroxide and 10 grams of cyclohexylamine, and crystallize at 160 ° C for 36 Hours, 72 hours, 120 hours, shaped, then dried at 100°C for 10 hours, and fired at 550°C for 3 hours. Under the condition of 550° C., the calcined catalyst was hydrothermally treated with a mixture of water vapor and nitrogen for 3 hours (the volume ratio of water vapor and nitrogen was 1:10). The hydrothermally treated catalyst was treated in (NH 4 ) 2 HPO 4Immerse in aqueous solution at 100°C for 4 hours, heat and evaporate, dry at 120°C for 8 hours, and then bake at 550°C for 3 hours. Phosphorous modified catalysts in La(NO 3 ) 3 Soak in an aqueous solution of 100°C for 4 hours, dry at 100°C for 10 hours after heating and evaporation, and bake at 550°C for 3 hours. After modification, the content of non-metal phosphorus in the catalyst is ...

Embodiment 4-6

[0034] Mix 100 grams of ZSM-11 molecular sieve raw powder with a silicon-aluminum ratio (mole) of 100, 20 grams of silica sol, 10 grams of aluminum sol, and 20 grams of cyclohexylamine, and crystallize at 120°C for 48 hours and 96 hours respectively , 144 hours, shaped, then dried at 120°C for 8 hours, and fired at 500°C for 5 hours. Under the condition of 550° C., the calcined catalyst was hydrothermally treated with a mixture of water vapor and nitrogen for 3 hours (the volume ratio of water vapor and nitrogen was 1:20). The hydrothermally treated catalyst was treated in (NH 4 ) 2 HPO 4 Immerse in the aqueous solution at 80°C for 8 hours, dry at 100°C for 10 hours after heating and evaporation, and then bake at 500°C for 5 hours. Phosphorous modified catalysts on Ce(NO 3 ) 3 Soak in an aqueous solution of 80°C for 8 hours, dry at 120°C for 8 hours after heating and evaporation, and bake at 500°C for 5 hours. After modification, the content of non-metal phosphorus in th...

Embodiment 7-9

[0036] Mix 100 grams of ZSM-35 molecular sieve raw powder with a silicon-aluminum ratio (mole) of 200, 60 grams of silica sol, 30 grams of tetrapropylammonium hydroxide and 10 grams of cyclohexylamine, and crystallize at 180 ° C for 36 Hours, 72 hours, 120 hours, shaped, then dried at 100°C for 10 hours, and fired at 600°C for 3 hours. Under the condition of 450° C., the calcined catalyst was hydrothermally treated with a mixture of water vapor and nitrogen for 24 hours (the volume ratio of water vapor and nitrogen was 1:15). The hydrothermally treated catalyst was treated in (NH 4 ) 2 HPO 4 Immerse in aqueous solution at 60°C for 10 hours, heat and evaporate, dry at 120°C for 8 hours, and then bake at 600°C for 3 hours. Phosphorous modified catalysts in La(NO 3 ) 3 Soaked in the aqueous solution at 60°C for 10 hours, dried at 100°C for 10 hours after heating and evaporation, and calcined at 600°C for 3 hours. After modification, the content of non-metal phosphorus in th...

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PUM

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Abstract

The invention discloses a catalyst for use in the preparation of propylene by olefin cracking, and a preparation method thereof. The catalyst is prepared by using molecular sieve raw powder of which the silicon to aluminum (molar) ratio is smaller than 300 as an active main body and by uniformly mixing the molecular sieve raw powder, silica sol and/or alumina sol and a template agent, forming by crystallization, drying, roasting, performing hydro-thermal treatment with high-temperature water vapor, and modifying by using rare earth metal and/or phosphorus as a modifier. The modifier comprises the following components in percentage by weight: 0.2 to 8 percent of rare earth metal, 0.1 to 5 percent of non-metal phosphorus and the balance of molecular sieve. The catalyst has high activity and stability and high propylene selectivity, and can be used in the field of propylene production industry.

Description

technical field [0001] The invention relates to a catalyst for producing propylene by olefin cracking and a preparation method thereof. Background technique [0002] Propylene is one of the basic organic chemical raw materials, mainly used in the production of polypropylene, cumene, propylene oxide, acrylonitrile, acrylic acid and many other products, which has an important impact on the national economy. In recent years, the annual demand for propylene has been increasing, and its annual growth rate has exceeded that of another important light olefin: ethylene. Propylene is mainly obtained through steam cracking ethylene unit and catalytic cracking unit, accounting for about 65% of the propylene source. In addition, many processes for the production of propylene have been developed at home and abroad, such as propane dehydrogenation, methanol to propylene and other technologies. [0003] C from steam crackers and catalytic crackers 4 -C 8 The mixture contains a large am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J29/65C07C4/06C07C4/10C07C11/04C07C11/06
CPCY02P20/52
Inventor 王伟跃
Owner 王伟跃
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