Supported catalyst for coal gasification and preparation method thereof

Abstract

The invention discloses a supported catalyst for coal gasification. The catalyst comprises a catalyst active component, a catalyst promoter and a carrier, wherein the catalyst active component refers to alkali metal carbonate, and accounts for 5-20% of the total weight of the catalyst; the catalyst promoter refers to a composite oxide, and accounts for 20-40% of the total weight of the catalyst, and the structure of the catalyst promoter is AxA'1- xByB'1-yO3; the carrier refers to silica or gamma-Al2O3, and accounts for 40-75% of the total weight of the catalyst. According to the invention, in a mode of adding the catalyst promoter, the catalytic activity of the active component for coal gasification is promoted, and the volatilization loss of the active component is suppressed, and meanwhile, the catalyst promoter is supported on the carrier with a higher specific surface and an enough strength, so that the original structure and catalytic activity of the catalyst after being reacted are still kept, and then the catalyst can be recycled so as to achieve the purpose of reutilization.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a supported catalyst for coal gasification and a preparation method thereof. Background technique [0002] As a clean energy, hydrogen energy is expected to become the main energy carrier in the future sustainable energy system, and large-scale and efficient hydrogen production depends on coal gasification technology. Therefore, gasification technology is the basis for clean, efficient and comprehensive utilization of coal and key technologies. Although the coal gasification technologies that have been industrialized at present have their own advantages, their shortcomings and shortcomings are also quite obvious, such as the ubiquitous high reaction temperature, difficulty in purifying the generated gas, high energy consumption, high requirements for equipment, and environmental pollution. serious adverse factors. This directly promotes the research of coal gasification technology unde...

AI Technical Summary

Problems solved by technology

However, all kinds of catalysts have certain disadvantages in application: alkaline earth metal catalysts require a relatively high gasification temperature; Fe and Ni commonly used in transition metal catalysts are easily poisoned and deactivated by sulfur; alkali metals are used in catalytic gasification applications. also have losses

When coal is used as the raw material for gasification, the amount of tar generated during the low-temperature gasification process is relatively large, which makes it possible for tar to deposit and adhere to the surface of the catalyst, resulting in reduced or deactivated catalyst activity; due to the gasification agent H 2 the presence of O, K 2 CO 3 Agglomeration will occur during the reaction process, so when the single-component catalyst is used for catalytic gasification, the contact between the catalyst and coal is greatly affected by the addition method, and the active components of the catalyst are easily lost due to volatilization into the gas phase during the reaction process, and K 2 CO 3 It will react with the acidic clay mineral components in coal to form insoluble salts, which increases the difficulty of catalyst reuse and the amount of ash to be processed.

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