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Catalyst for preparing low-carbon olefins by one-step conversion of synthetic gas and preparation method thereof

A technology of low-carbon olefins and synthesis gas, which is applied in the field of catalysts and preparations for one-step conversion of synthesis gas to low-carbon olefins. It can solve the problems of high methane selectivity, insufficient catalyst stability, and limitations, and achieve low selectivity, Excellent catalytic performance, high selectivity effect

Active Publication Date: 2017-01-25
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although some progress has been made in the one-step synthesis of light olefins from syngas, the C of the above research results 2 -C 4 The selectivity of olefins is mostly not more than 60%, and the selectivity is still limited by the Anderson-Schulz-Flory distribution, and there are problems of high methane selectivity (>20%) and insufficient stability of the catalyst in most studies

Method used

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  • Catalyst for preparing low-carbon olefins by one-step conversion of synthetic gas and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 0.78g Ga(NO 3 ) 3 , add 60ml deionized water and stir for 2h. Weigh 2.0 g of cerium-zirconium solid solution and add it to the Ga-containing aqueous solution, stir at 60°C for 7 hours, then heat up to 80°C and evaporate to dryness, transfer the obtained sample to a drying oven and dry at 60°C for 12 hours. Add the above dried solid powder and 3.43g double microporous zeolite molecular sieve H-Y into 100ml ethylene glycol and stir for 5h, then ultrasonically disperse for 3h, move the filtered and washed sample to a vacuum drying oven and dry at 80°C for 8h . The obtained sample was transferred to a muffle furnace and fired at a rate of 2 °C / min to 500 °C for 10 h. The calcined solid sample is pressed into tablets, and the obtained sample is the catalyst.

[0028] The catalytic reaction is carried out in a fixed-bed high-pressure microreactor, and the H in the syngas 2 The volume ratio to CO is 2, the reaction pressure is 2.0MPa, and the space velocity of the s...

Embodiment 2

[0030] Weigh 0.78g Ga(NO 3 ) 3, add 60ml deionized water and stir for 2h. Weigh 2.0 g of lanthanum-zirconium solid solution and add it to the Ga-containing aqueous solution, stir at 60°C for 7 hours, then heat up to 80°C and evaporate to dryness, transfer the obtained sample to a drying oven and dry at 60°C for 12 hours. Add the above-mentioned dried solid powder and 3.43g double microporous zeolite molecular sieve H-ZSM-5 into 100ml ethylene glycol and stir for 5h, then ultrasonically disperse for 3h, and move the filtered and washed sample to a vacuum drying oven at 80 Dry at ℃ for 8h. The obtained sample was transferred to a muffle furnace and fired at a rate of 2 °C / min to 500 °C for 10 h. The calcined solid sample is pressed into tablets, and the obtained sample is the catalyst.

[0031] The catalytic reaction was carried out in a fixed-bed high-pressure microreactor. The reaction conditions and product analysis were the same as in Example 1. The reaction performance ...

Embodiment 3

[0033] Weigh 0.78g Ga(NO 3 ) 3 , add 60ml deionized water and stir for 2h. Weigh 2.0 g of magnesium-zirconium solid solution and add it to the Ga-containing aqueous solution, stir at 60°C for 7 hours, then heat up to 80°C and evaporate to dryness, transfer the obtained sample to a drying oven and dry at 60°C for 12 hours. Add the above-mentioned dried solid powder and 3.43g double microporous zeolite molecular sieve H-ZSM-11 into 100ml ethylene glycol and stir for 5h, then ultrasonically disperse for 3h, and move the filtered and washed sample to a vacuum drying oven at 80 Dry at ℃ for 8h. The obtained sample was transferred to a muffle furnace and fired at a rate of 2 °C / min to 500 °C for 10 h. The calcined solid sample is pressed into tablets, and the obtained sample is the catalyst.

[0034] The catalytic reaction was carried out in a fixed-bed high-pressure microreactor. The reaction conditions and product analysis were the same as in Example 1. The reaction performanc...

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Abstract

A catalyst for preparing low-carbon olefins by one-step conversion of synthetic gas and a preparation method thereof relate to catalysts; the catalyst is made from 20-60% of a zirconium-based solid solution,30-70% of a double-micropore zeolite molecular sieve and 0.1-10% of metal oxides; the preparation method comprises: adding salt compounds of at least one element from IA, IIIA, VIIB, IB, IIB and the like into deionized water or alcohol to obtain solution A having a mass concentration of 0.1-15%; adding the zirconium-based solid solution into the solution A, heating, drying by distillation, and drying to obtain solid powder; adding the solid powder and the double-micropore zeolite molecular sieve into ethylene glycol, ultrasonically dispersing, and moving a filtered and washed sample to a vacuum drying box, drying at 50-100 DEG C for 2-24 h, calcining in a muffle furnace, and tableting obtained solid sample to obtain the catalyst.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for one-step conversion of synthesis gas to produce low-carbon olefins and a preparation method thereof. Background technique [0002] Low-carbon olefins (ethylene, propylene, and butene) are important basic chemical raw materials, widely used in the synthesis of plastics, rubber, organic solvents, and other important chemicals, and occupy an important position in industrial production and the national economy. In recent years, my country's consumption demand for chemical raw materials such as ethylene and propylene has increased sharply, and the contradiction between supply and demand of low-carbon olefins has become increasingly prominent. The current production of light olefins mainly comes from naphtha cracking and catalytic dehydrogenation of light alkanes. Although the recent oil price is low, my country still needs to face the long-term shortage of oil resources. Therefore, it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/08B01J29/40B01J29/70B01J29/78B01J29/83B01J29/85
CPCB01J29/087B01J29/088B01J29/405B01J29/7057B01J29/78B01J29/83B01J29/85B01J2229/18
Inventor 王野康金灿成康张庆红刘小梁顾榜汪孟恒
Owner XIAMEN UNIV
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