Catalytic coal gasification catalyst and preparation method and application thereof

Abstract

The invention belongs to the technical field of catalytic coal gasification catalysts and provides a high-efficiency catalytic coal gasification catalyst prepared from a low-price halide ion metal salt and application thereof. According to the catalyst, the low-price halide ion metal salt serves as a precursor of the catalyst, a pH value regulator is adopted, active metal components are uniformly loaded on a coal base by virtue of an ion exchange technology, the active components are dispersed at an atomic scale, and corrosion of the halide ions to the reactor material is avoided. The catalyst prepared by the invention is applied to a fixed bed reactor for preparing natural gas by virtue of mild catalytic coal gasification, so that the conversion rate of converting the coal into gaseous products can be effectively improved, the composition of the coal gas can be changed, the content of methane is improved, and the coal utilization rate is greatly improved.

Description

technical field [0001] The invention relates to a catalyst, its preparation method and application, in particular to a catalyst for coal catalytic gasification, its preparation method and application. Background technique [0002] Coal gasification, as one of the important means of coal processing and conversion, has been paid more and more attention by people. This is because coal gasification can provide syngas and substitute natural gas. If low-quality coal such as high-ash coal and pulverized coal can be used for gasification, it will be of great significance to protect the environment and reduce costs. As a mild gasification technology, the catalytic gasification of coal has always been an interesting research topic. The key is the choice of catalyst. The coal catalytic gasification catalysts that have been studied so far include almost the entire metal elements of the periodic table. There are mainly the following categories: (1) metal oxides, metal hydroxides and ...

AI Technical Summary

Problems solved by technology

There are mainly the following categories: (1) metal oxides, metal hydroxides and salts mainly composed of alkali metals and alkaline earth metals, including NaOH, KOH, CaCO 3 、K 2 CO 3 、Na 2 CO 3 , CaO, etc.; (2) transition metals, mainly including iron, cobalt, nickel, etc., among which Ni shows better catalytic activity; (3) rare earth metals, mainly Ce(NO 3 ) 3 Considering the high price and low catalyst activity, so far the research on coal gasification using rare earth metals as catalysts has not aroused people's actual interest; (4) Minerals or ash in coal, no matter what kind of coal or More or less always contain a certain amount of minerals (Fuel,2000,79:427-438)

Among them, alkali metal carbonates, such as K 2 CO 3 , is currently recognized as an excellent catalyst, but the price of the catalyst is relatively expensive, which is 10,000 yuan / ton. At the same time, due to the existence of clay minerals in coal, K 2 CO 3 It reacts with clay minerals to form potassium aluminum silicate, which deactivates the catalyst; and potassium aluminum silicate is insoluble in water, which makes it difficult to recover the catalyst and make it difficult to recycle; while the price of KCl is relatively cheap, 5,000 yuan / ton, but the direct Using impregnation method or solid-phase mixing method to load KCl on coal-based materials, the gasification efficiency is low, which is mainly attributed to the - The strong electronegativity makes the anion and cation have a very strong affinity. As a result, the cation cannot be effectively bonded to the functional groups on the surface of the coal-based material, so that it cannot show an excellent catalytic effect. At the same time, Cl - May cause corrosion to the reactor material, thus restricting the low-cost Cl - Application of Metal Salts in Coal Gasification (Energy & Fuels, 1987, 1:308-309)

[0003] According to reports, more than 80 chemical elements have been found in seawater, but their contents vary greatly

Images