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

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...

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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, that is, "blue gas technology". Commercial promotion, but there are still problems such as low single-pass gasification rate of coal, narrow applicability of catalyst coal types, catalysts are easy to react with minerals in coal to form insoluble silicates and iron sulfide salts, and some catalysts are difficult to recycle. As a result, part of the catalyst is deactivated and the production cost is increased

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