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Method for preparing low-carbon olefin catalyst by high-activity-stability carrier-type iron-based synthetic gas

A low-carbon olefin and supported technology, which is applied in the field of preparation of high-activity and stable supported iron-based synthesis gas to low-carbon olefin catalysts, can solve the problems of difficult to achieve reaction activity, high catalyst cost, and low CO conversion rate , to achieve the effect of favorable activity stability, simple preparation method and improved performance

Active Publication Date: 2012-05-09
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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  • Method for preparing low-carbon olefin catalyst by high-activity-stability carrier-type iron-based synthetic 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, and the volume of consumed water is 48ml. The silica gel carrier is subjected to desodium treatment. The operation method and conditions of desodium treatment are as follows: first wash with ammonium nitrate at room temperature, and then repeatedly wash with distilled water. It is required that the sodium content in the silica gel after desodium is less than 500 μg / g. The desodiated silica gel is subjected to hydrothermal treatment, and the operation method and conditions of hydrothermal treatment are as follows: temperature 300° C., pressure 0.3 MPa, and 100% steam for 3 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 impregnati...

example 2

[0021] Weigh commercially available silica gel, add distilled water dropwise until initial moistening, and the volume of consumed water is 48ml. The silica gel carrier is subjected to sodium removal treatment, and the operation method and conditions of the sodium removal treatment are as follows: washing with nitric acid at room temperature, and then repeated washing with distilled water. The desodiated silica gel is subjected to hydrothermal treatment. The hydrothermal treatment operation method and conditions are as follows: temperature 350° C., pressure 0.3 MPa, and 100% steam for 3 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 ...

example 3

[0023]Weigh commercially available silica gel, add distilled water dropwise until initial moistening, and the volume of consumed water is 48ml. The sodium removal treatment was the same as in Example 1, the hydrothermal treatment temperature was 350° C., the pressure was 0.5 MPa, and the hydrothermal treatment time was 6 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, a...

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Abstract

The invention discloses a method for preparing a low-carbon olefin catalyst by high-activity-stability carrier-type iron-based synthetic gas. Silica gel is taken as a carrier, and a metal promoter and an active component Fe are loaded by adopting an immersion method, wherein the used silica gel carrier is firstly subjected to hydrothermal treatment, and the condition for the hydrothermal treatment is that 50%-100% water vapor is used for carrying out the hydrothermal treatment for 0.5-20h at the temperature of 150-600 DEG C. After the silica gel carrier used in the method disclosed by the invention is subjected to the hydrothermal treatment, the strong interaction between the carrier and the active component is overcome, and thus, the activity and the selectivity of the catalyst are improved. The catalyst prepared by the method disclosed by the invention is applicable to the reacting processes of preparing the low-carbon olefins, such as ethylene, propylene, butylene and the like, from the synthetic gas.

Description

technical field [0001] The invention relates to a preparation method of a high activity and stability loaded iron-based synthesis gas catalyst for producing low-carbon olefins, in particular to a low-cost and easy-to-industrial application modified silica gel as a carrier and modified by adding metal additives A preparation method of a high-activity iron-based synthesis gas catalyst for producing low-carbon olefins. 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 de...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J23/889B01J37/10C07C1/04C07C11/02
Inventor 张舒冬李杰张喜文宋喜军
Owner CHINA PETROLEUM & CHEM CORP
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