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Bifunctional catalyst as well as preparation method and application thereof

A dual-function catalyst and oxide technology, applied in catalysts, molecular sieve catalysts, carbon compound catalysts, etc., can solve the problems of low CO conversion rate, low light olefin selectivity, and low alkene.

Pending Publication Date: 2021-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low catalyst reactivity, low conversion rate of CO, low selectivity of low-carbon olefins and low ratio of olefins in the products existing in the prior art, and provides a new catalyst for synthesis gas production. A bifunctional catalyst for low-carbon olefins, which has the advantages of high conversion activity and high olefin selectivity when used in the reaction of syngas to low-carbon olefins

Method used

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  • Bifunctional catalyst as well as preparation method and application thereof
  • Bifunctional catalyst as well as preparation method and application thereof
  • Bifunctional catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] ZnCrOx mixed oxides are prepared as follows:

[0052] Weigh the amount of Cr(NO 3 ) 3 9H 2 O and Zn(NO 3 ) 2 ·6H 2 O solid is dispersed in water, stirred until completely dissolved; weigh a certain amount of (NH 4 ) 2 CO 3 The solid was dissolved in water to make a 0.1M solution. Add the two aqueous solutions dropwise to the beaker for co-precipitation, filter, wash, dry at 100°C overnight, and roast at 500°C for 4 hours to obtain the metal oxide ZnCrO 4 .

[0053] SAPO-42 molecular sieve is prepared according to the following steps:

[0054] Add 12.5 grams of pseudo-boehmite to 30 grams of water, stir and disperse evenly; add 21.9 grams of phosphoric acid (85%) to the above slurry, and continue stirring at room temperature; mix 1.82 grams of tetramethylammonium hydroxide, 12.6 grams of diethanolamine , 1.2 grams of hydrofluoric acid (40%) and 0.5 grams of seed crystals (type A molecular sieve, Si / Al=1.0, containing Al 2 o 3 62.2 wt%, SiO 2 36.6% by weig...

Embodiment 2

[0057] ZnCrOx mixed oxide is prepared by [embodiment 1];

[0058] SAPO-42 molecular sieve is prepared according to the following steps:

[0059] Add 12.5 grams of pseudo-boehmite to 30 grams of water, stir and disperse evenly; add 21.9 grams of phosphoric acid (85%) to the above slurry, and continue stirring at room temperature; mix 1.82 grams of tetramethylammonium hydroxide, 12.6 grams of diethanolamine , 1.2 grams of hydrofluoric acid (40%) and 0.5 grams of seed crystals (type A molecular sieve, Si / Al=2.5, containing Al 2 o 3 40.2 wt%, SiO 2 59.1% by weight) were added to the above-mentioned slurry respectively to form a crystallized gel; in the crystallized gel, Al 2 o 3 Aluminum source in terms of SiO 2 Silicon source in terms of P 2 o 5 The molar composition of the calculated phosphorus source, templating agent and solvent is as follows: P 2 o 5 :Al 2 o 3 :SiO2 2 :(TMA) 2 O:DEA:H 2 O=0.95:1.0:0.05:0.01:0.12:40; the crystallized gel was stirred at room tem...

Embodiment 3

[0062] ZnCrOx mixed oxide is prepared by [embodiment 1];

[0063] SAPO-42 molecular sieve is prepared according to the following steps:

[0064] Add 12.5 grams of pseudo-boehmite to 30 grams of water, stir and disperse evenly; add 21.9 grams of phosphoric acid (85%) to the above slurry, and continue stirring at room temperature; mix 1.82 grams of tetramethylammonium hydroxide, 12.6 grams of diethanolamine , 1.2 grams of hydrofluoric acid (40%) and 0.5 grams of seed crystals (type A molecular sieve, Si / Al=5.3, containing Al 2 o 3 25.2 wt%, SiO 2 74.3% by weight) were added to the above-mentioned slurry respectively to form a crystallized gel; in the crystallized gel, Al 2 o 3 Aluminum source in terms of SiO 2 Silicon source in terms of P 2 o 5 The molar composition of the calculated phosphorus source, templating agent and solvent is as follows: P 2 o 5 :Al 2 o 3 :SiO2 2 :(TMA) 2 O:DEA:H 2 O=0.95:1.0:0.062:0.01:0.12:40; the crystallized gel was stirred at room te...

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Abstract

The invention belongs to the field of chemical engineering, and particularly relates to a bifunctional catalyst for directly preparing low-carbon olefin from synthesis gas as well as a preparation method and an application of the bifunctional catalyst, the CO conversion rate and the low-carbon olefin selectivity are improved and the methane selectivity is reduced by catalyzing the reaction of the synthesis gas by coupling a metal oxide and a molecular sieve with an LTA topological structure. The product has the advantages of simplicity and high catalyst stability.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a bifunctional catalyst for producing low-carbon olefins from synthesis gas, a preparation method and application thereof. Background technique [0002] As an energy carrier, syngas can not only be used as a platform for the transformation of chemical energy such as coal and natural gas, but also as a medium for the utilization of biomass and organic solid waste. Carbon monoxide can be utilized and converted in a wide range of ways, with a wide variety of products, including oils, waxes, olefins, and aromatics. Among them, the research on the production of low-carbon olefins from carbon monoxide hydrogenation (that is, the direct production of low-carbon olefins from syngas) has attracted the attention of scientists, mainly because low-carbon olefins (ethylene, propylene) are the basic raw materials for many chemical products, and their production level is comparable to that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01J35/10C07C1/04C07C11/04C07C11/06
CPCB01J29/85C07C1/043C07C2529/85B01J2229/18B01J35/60C07C11/04C07C11/06Y02P20/52
Inventor 焦文千王仰东刘苏周海波苏俊杰刘畅张琳
Owner CHINA PETROLEUM & CHEM CORP
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