Catalyst for medium and low temperature catalytic coal gasification for producing natural gas and preparation method thereof

A coal catalytic gasification and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of difficult catalyst recovery, catalyst deactivation, application scope It can solve the problems of narrow coal pulverized coal gasification, improve the gasification rate, and solve the effects of poisoning and deactivation.

Inactive Publication Date: 2014-12-03
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, the catalyst has a narrow scope of application to coal types, the activity is not stable enough, and there are problems in the recycling of the catalyst.
Later, on the basis of the above, the Great Point Energy (GPE) company in the United States launched the technology of "one-step low-temperature catalytic gasification of coal to natural gas" after years of technical improvement and upgrading, tha

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  • Catalyst for medium and low temperature catalytic coal gasification for producing natural gas and preparation method thereof

Examples

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Example Embodiment

[0030] Example 1

[0031] Prepare single-component potassium salt catalytic coal powder, weigh 20g coal powder, immerse it in 40ml potassium carbonate solution, stir at room temperature ~90℃ for 1~4h, then filter by suction, 100~200℃ in nitrogen atmosphere Dry for 1 to 5 hours, then cool and screen to obtain "K" catalytic coal powder, which is sealed and stored for later use, in which the potassium / carbon mass fraction is about 10%.

Example Embodiment

[0032] Example 2

[0033] Prepare two-component catalytic coal powder, weigh 20g coal powder, immerse it in 40ml calcium nitrate solution, stir at room temperature~90℃ for 1~4h, then filter by suction and dry in a nitrogen atmosphere at 100~200℃ 1~5h, then cool and grind to obtain the pretreated sample.

[0034] Then take 10g of the pretreated sample, immerse it in 40ml of potassium carbonate, stir at room temperature to 90℃ for 1 to 4 hours, then filter by suction, dry in a nitrogen atmosphere at 100 to 200℃ for 1 to 5 hours, and then cool it down "K-Ca" catalyzed coal powder is obtained by sieve, which is sealed and stored for later use. The mass fraction of potassium / carbon is about 10%, and the mass fraction of calcium / potassium is about 30%.

Example Embodiment

[0035] Example 3

[0036] Prepare composite multi-element catalytic coal powder, weigh 20g coal powder, immerse it in 40ml calcium nitrate solution, stir at room temperature~90℃ for 1~4h, then filter by suction and dry in nitrogen atmosphere at 100~200℃ 1~5h, then cool and grind to obtain the pretreated sample.

[0037] Then take 10g of the pretreated sample, immerse it in 40ml of potassium carbonate and nickel nitrate solution, stir at room temperature ~90℃ for 1~4h, then filter by suction and dry it in a nitrogen atmosphere at 100~200℃ for 1~5h. After cooling and sieving to obtain "K-Ca-Ni" catalytic coal powder, sealed and stored for later use. The mass fraction of potassium / carbon is about 10%, the mass fraction of calcium / potassium is about 30%, and the mass fraction of nickel / potassium is about 20%.

[0038] The following are examples to examine the effects of different transition metal salts on catalyst activity and selectivity.

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Abstract

The invention relates to a catalyst for medium and low temperature catalytic coal gasification for producing natural gas and a preparation method thereof, and in particular, the catalyst consists mainly of alkali metals, alkaline earth metals, and transition metals; the alkali metals are mainly potassium salts, such as potassium carbonate, potassium sulfate or potassium nitrate and the like, the potassium/ carbon mass fraction is 1-20%; the alkaline earth metals are calcium salts, the calcium/potassium mass fraction is 10-50%; the transition metals are mainly one or two of iron, nickel, molybdenum, cobalt and cadmium, can be salts or oxides thereof, and the transition metal / potassium mass fraction is 5-30%. The catalyst is helpful to solve the problem of poisoning deactivation and unstable catalyst activity and other problems caused for the reason that the catalyst for the medium and low temperature catalytic coal gasification for producing the natural gas is easy to react with minerals in coal, and the problems are solved, so that future realization of industrialization can be facilitated.

Description

technical field [0001] The present invention relates to a catalyst for producing natural gas by catalytic gasification of medium and low temperature coal and a preparation method thereof, in particular to a catalyst mainly containing one or two elements of alkali metals, alkaline earth metals and transition metals and its preparation method. Preparation. Background technique [0002] Since the 1970s, Exxon in the United States has developed K 2 CO 3 A process for producing substitute natural gas through coal steam gasification with a catalyst. This process converts traditional high-temperature gasification of coal into crude synthesis gas, and then integrates processes such as sulfur-tolerant shift, low-temperature methanol washing, dry fine desulfurization, and multi-stage methanation. In a gasification reactor, it has many advantages such as short process, simple operation, low energy consumption and low cost. However, the catalyst has a narrow scope of application to c...

Claims

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Application Information

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IPC IPC(8): B01J23/78B01J23/28B01J23/26C10L3/08
Inventor 赵华郝爱香李海涛吕锋祝东红侯红美
Owner CHINA PETROLEUM & CHEM CORP
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