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Catalyst for preparation of propylene by direct dehydrogenation of propane and preparation method thereof

A catalyst and direct technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as stability to be improved, and achieve the effects of weak catalyst acidity, simple preparation method, and long single-pass life.

Active Publication Date: 2014-12-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, molecular sieve materials with special pore structures and shape-selective properties have been gradually used in the field of dehydrogenation of low-carbon alkanes. For example, the patents US6541408 and US6346498 of Exxonmobil Corporation of the United States disclose a catalyst based on ZSM system molecular sieves, disclosed in CN101066532 A propane dehydrogenation catalyst based on a ZSM-5 molecular sieve containing tin as a carrier is disclosed. CN101125298 discloses a propane catalyst based on an alumina-modified mesoporous molecular sieve. CN101773850 discloses a propane catalyst based on a SAPO-series Propane deoxygenation catalysts supported by molecular sieves, these catalysts have high dehydrogenation activity and selectivity under certain reaction conditions, but the stability needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve 16.4g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123) in about 120ml of water, then add 320ml of HCl with a concentration of 1.5mol / L, stir for 1h, then add dropwise 32.2 g tetraethyl silicate, after the dropwise addition, the temperature was raised to about 40°C, stirred for 20 hours, then transferred to a small stainless steel tank for crystallization at 120°C for 24 hours, then filtered, washed, dried, roasted to obtain mesoporous molecular sieve SBA-15, pressed Slices are ready for use.

[0029] 0.1139g of tin dichloride was dissolved in about 16ml of ethanol, 6.0g of the SBA-15 molecular sieve precursor prepared above was immersed in it for 4h, dried at 60°C, and calcined at 500°C for 8h to obtain Sn / SBA-15.

[0030] The obtained Sn / SBA-15 was impregnated with a certain amount of mixed aqueous solution of chloroplatinic acid and magnesium nitrate for 4 hours, dried at 120°C, and calcined at 500°C for 8 hours to obtain...

Embodiment 2

[0034] Dissolve 16.4g of P123 in about 120ml of water, then add 20ml of HCl320ml with a concentration of 1.5mol / L, stir for 1h, then add 32.2g of tetraethyl silicate dropwise, raise the temperature to about 40°C after the dropwise addition, stir for 20h, and then transfer to stainless steel Crystallize in a small tank at 120°C for 24 hours, then filter, wash, dry, and roast to obtain mesoporous molecular sieve SBA-15, which is pressed into tablets for use.

[0035] Dissolve 0.0574g of tin dichloride in about 10ml of ethanol, put 3.0g of the previously prepared SBA-15 molecular sieve precursor into it and soak for 4h, dry at 60°C, and bake at 500°C for 8h to obtain Sn / SBA-15.

[0036] The obtained Sn / SBA-15 was impregnated with a certain amount of mixed aqueous solution of chloroplatinic acid and calcium chloride for 4 hours, dried at 120°C, and calcined at 500°C for 8 hours to obtain a PtSnCa / SBA-15 catalyst.

[0037] The prepared catalyst contains Pt0.5%, Sn1.0%, Ca0.72%.

...

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PUM

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Abstract

The invention relates to a catalyst for preparation of propylene by direct dehydrogenation of propane; the catalyst comprises a carrier which comprises a mesoporous molecular sieve; an active component supported on the carrier; and an assistant, wherein the active component comprises a platinum group metal, and the assistant comprises a group-IV A metal element and an alkaline earth metal. The invention also provides a preparation method of the catalyst, and the method includes 1) providing the mesoporous molecular sieve as the carrier; 2) impregnating the carrier with ethanol solution of tin chloride to obtain a tin / mesoporous molecular sieve composition; and 3) impregnating the tin / mesoporous molecular sieve composition with a mixed water solution containing platinum and the assistant to obtain the catalyst.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a catalyst for producing propylene from propane dehydrogenation and a preparation method thereof. Background technique [0002] Propane is an important organic chemical raw material, widely used in the production of polypropylene, acrylonitrile, propylene oxide, isopropanol, cumene, acrylic acid and other chemical products. Propylene is mainly derived from the co-production of ethylene from petroleum cracking and the by-products of petroleum catalytic cracking and refining. Since the 1990s, because the original source of propylene could not meet the demand, propane dehydrogenation technology has become the third source of propylene. Propane dehydrogenation technology mainly includes catalytic dehydrogenation, oxidative dehydrogenation and membrane reactor dehydrogenation, among which propane dehydrogenation has many sets of industrial equipment abroad. [0003] There are mainly two syst...

Claims

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Application Information

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IPC IPC(8): B01J29/035C07C11/06C07C5/333
CPCY02P20/52
Inventor 冯静张明森刘红梅柯丽武洁花赵清锐
Owner CHINA PETROLEUM & CHEM CORP
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