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Preparation method of catalyst in process of producing light olefins by high-activity load type iron-based synthesis gas

A low-carbon olefin, supported technology, which is applied in the field of preparation of high-activity supported iron-based synthesis gas to low-carbon olefin catalyst, can solve the problems of difficult to achieve reactivity, low CO conversion rate, and high catalyst cost, and achieve mechanical The effect of high strength, improved activity, and simple preparation method

Active Publication Date: 2013-08-28
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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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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  • Preparation method of catalyst in process of producing light olefins by high-activity load type iron-based synthesis gas

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, the volume of consumed water is 48ml, 48ml concentration is 5% ammonium carbonate solution, add in silica gel at 50 ℃, process 10 hours. Dry at 60°C for 24 hours, then bake at 280°C for 15 hours. Based on the final catalyst K content of 0.023wt%, weigh 0.0179g of potassium nitrate and add distilled water to 48g, add the above-mentioned modified carrier silica gel for impregnation, dry at 60°C for 24 hours, and bake at 350°C for 10 hours. Based on the final catalyst Fe content of 3wt%, weigh 6.6303g of ferric nitrate and add distilled water to 48g, add to the above-mentioned sample impregnated with potassium, dry at 60°C for 24 hours, and bake at 350°C for 10 hours in vacuum or nitrogen atmosphere. Based on the final catalyst manganese content of 1.06wt%, weig...

example 2

[0021] Weigh 30g of commercially available silica gel, add distilled water dropwise until initial moistening, the volume of consumed water is 48ml, add 48ml of 15% ammonium carbonate solution to the silica gel at 80°C, and stir. Treat for 30 hours and dry at 90°C for 16 hours. According to the final catalyst K content of 0.39wt%, weigh 0.3042g of potassium nitrate, add distilled water to 48g, add the above-mentioned modified carrier silica gel to impregnate, dry at 100°C for 16 hours, and roast in vacuum or nitrogen atmosphere at 550°C for 4 Hour. Based on the final catalyst Fe content of 9wt%, weigh 19.8909g of ferric nitrate, add distilled water to 48g, add the above-mentioned potassium-impregnated sample, dry at 100°C for 16 hours, and bake in vacuum or nitrogen atmosphere at 550°C for 4 hours. Based on the final catalyst manganese content of 3.6wt%, weigh 7.0355g of 50% manganese nitrate solution, add distilled water to 48g, add the above sample impregnated with potassium...

example 3

[0023]Weigh 30g of commercially available silica gel, add distilled water dropwise until initial moistening, the volume of consumed water is 48ml, add 48ml of ammonium carbonate solution with a concentration of 20% to the silica gel at 95°C, stir for 100 hours, and dry at 100°C for 8 hours . Based on the final catalyst K content of 0.8wt%, 0.624g of potassium nitrate was weighed and dissolved in 48ml, added to the modified carrier silica gel for impregnation, dried at 150°C for 8 hours, and roasted at 700°C for 2 hours in vacuum or nitrogen atmosphere. Based on the final catalyst Fe content of 12wt%, 26.5212g of iron nitrate was weighed and dissolved in 48ml, added to the above-mentioned sample impregnated with potassium, 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 manganese content of 5.44wt%, weigh 10.6315g of 50% manganese nitrate solution, add water to 48g, add the above sample impregnated with ...

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Abstract

The invention discloses a preparation method of a catalyst in a process of producing light olefins by high-activity load type iron-based synthesis gas. The preparation method comprises the steps of: with silicon gel as a carrier, firstly, carrying out surface modification on the silicon gel carrier, and then loading a metal additive and an active component Fe by adopting an immersion method, wherein an ammonium salt-containing buffer solution is adopted for immersion in the surface modification method of the silicon gel carrier. After the adopted silicon gel carrier is modified, the strong interaction function between the carrier and the active component is overcome, and the activity and the selectivity of the catalyst are improved. The catalyst prepared by adopting the preparation methodis suitable for a reaction process for producing light olefins such as ethylene, propylene, butylene and the like by using the synthesis gas.

Description

technical field [0001] The invention relates to a preparation method of a high-activity loaded iron-based synthesis gas catalyst for producing low-carbon olefins, in particular to a low-cost and easy-to-industrial application high-activity catalyst modified with modified silica gel and added with metal additives. A method for preparing a catalyst for producing low-carbon olefins from iron-based synthesis gas. 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 l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J32/00B01J37/02C07C1/04C07C11/02
Inventor 李杰张舒冬张喜文宋喜军
Owner CHINA PETROLEUM & CHEM CORP
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