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Method for preparing low-carbon olefin catalyst by loading iron-based synthetic gas

A technology of low-carbon olefins and catalysts, which is applied in the field of preparation of supported iron-based syngas-based low-carbon olefin catalysts, can solve the problems of difficult to achieve reaction activity, low CO conversion rate, high catalyst cost, etc., and achieve high mechanical strength, The effect of improving activity and simple preparation method

Active Publication Date: 2012-07-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] CN1065026A discloses a method for producing ethylene from synthesis gas, which involves the preparation of catalysts by chemical precipitation and mechanical mixing, using precious metals or rare metals, such as niobium, gallium, praseodymium, scandium, indium, cerium, lanthanum, ytterbium, etc. For other chemical elements, the selectivity of ethylene is 65%-94%, but the conversion rate of CO is very low, only about 10%, 12% and 15%. The recycling of CO will inevitably lead to energy consumption, and the catalyst cost is high
However, at present, silica is rarely used as a carrier in the reaction of Fe-based supported syngas to directly prepare olefins, mainly because Fe and SiO 2 The strong interaction between the carriers makes it difficult for some Fe to be reduced, and it is difficult to achieve an ideal reactivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] Weigh commercially available silica gel (pore volume is 1.06ml / g, specific surface area is 386.81m 2 / g, the following examples all use the silica gel) 30g, distilled water is added dropwise to initial moistening, and the volume of consumed water is 48ml. The aqueous solution with a sucrose mass concentration of 5% was adjusted to a pH value of 3 with sulfuric acid, and the mass ratio of the silica gel to the mixed solution was 1:4, and the silica gel and the sucrose acidic solution were fully mixed and stirred for 2 hours at a temperature of 60°C. Dry at 60°C for 24 hours, and then bake at 800°C for 10 hours in vacuum or nitrogen atmosphere.

[0019] Based on the final catalyst K content of 0.03 wt%, 0.0234 g of potassium nitrate was weighed and dissolved in 48 ml, added to the modified carrier silica gel for impregnation, dried at 60° C. for 24 hours, and roasted at 350° C. in vacuum or nitrogen atmosphere for 10 hours. Based on the final catalyst Fe content of 4wt%,...

example 2

[0022] Weigh commercially available silica gel, add distilled water dropwise until initial moistening, and the volume of consumed water is 48ml. The aqueous solution with a sucrose mass concentration of 15% was adjusted to a pH value of 2 with hydrochloric acid, and the mass ratio of the silica gel to the mixed solution was 1:9, and the silica gel and the sucrose acidic solution were fully mixed and stirred at a temperature of 70° C. for 3.5 hours. Dry at 100°C for 16 hours, then vacuum bake at 900°C for 8 hours.

[0023] Based on the final catalyst K content of 0.25 wt%, 0.1939 g of potassium nitrate was weighed and dissolved in 48 ml, added to the modified carrier silica gel for impregnation, dried at 100 ° C for 16 hours, and roasted at 550 ° C for 4 hours in vacuum or nitrogen atmosphere. Based on the final catalyst Fe content of 6wt%, 13.0212g of iron nitrate was weighed and dissolved in 48ml, added to the sample impregnated with potassium, dried at 100°C for 16 hours, an...

example 3

[0025]Weigh commercially available silica gel, add distilled water dropwise until initial moistening, and the volume of consumed water is 48ml. The aqueous solution with a sucrose mass concentration of 20% was adjusted to a pH value of 1 with sulfuric acid, and the mass ratio of the silica gel to the mixed solution was 1:12, and the silica gel and the sucrose acidic solution were fully mixed and stirred for 5 hours at a temperature of 80°C. Dry at 120°C for 8 hours, then vacuum bake at 1000°C for 4 hours.

[0026] Based on the final catalyst K content of 0.53 wt%, 0.1939 g of potassium nitrate was weighed and dissolved in 48 ml, added to the above-mentioned modified carrier silica gel for impregnation, dried at 150 ° C for 8 hours, and roasted in vacuum or nitrogen atmosphere at 700 ° C for 2 hours. Based on the final catalyst Fe content of 8wt%, 17.3616g of ferric nitrate was weighed and dissolved in 48ml, added to the above-mentioned sample impregnated with potassium, dried ...

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Abstract

The invention discloses a method for preparing a low-carbon olefine catalyst by a loading iron-based synthetic gas, which comprises the following steps of: firstly carrying out surface modification on a silica gel carrier by using silica gel as a carrier, and then loading a metal auxiliary agent and an active component Fe by using an immersion method, wherein the surface modification method of the silica gel carrier comprises the following step of carrying out immersion treatment by using the acidic solution of sugar. After the silica gel carrier adopted is modified, the strong interaction between the carrier and the active component is overcome, and the activity and the selectivity of the catalyst are improved. The catalyst prepared by using the method is suitable for a reaction process of producing low-carbon olefines of ethylene, propylene, butane and the like by the synthetic gas.

Description

technical field [0001] The invention relates to a preparation method of a loaded iron-based synthesis gas catalyst for producing low-carbon olefins, in particular to a low-cost and easy-to-industrial-apply high-activity iron-based catalyst modified with modified silica gel and added with metal additives. A preparation method of a catalyst for producing low-carbon olefins from syngas. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important basic organic chemical raw materials. With the development of the chemical industry, their demand is increasing. So far, the way to produce low-carbon olefins such as ethylene and propylene is mainly through the cracking process of light oil. With the increasing depletion of oil resources worldwide, the future energy structure will inevitably shift. Compared with oil resources, coal and natural gas resources are relatively abundant, and it is of great significance to develop low-carbon olefin productio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/02B01J23/889C07C1/04C07C11/04C07C11/06C07C11/08
CPCY02P20/52
Inventor 李杰张舒冬陈楠倪向前张喜文
Owner CHINA PETROLEUM & CHEM CORP
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