Preparation method and application of heterogeneous catalyst for desorbing CO2 in solution

Abstract

The invention discloses a preparation method and application of a heterogeneous catalyst for desorbing CO2 in a solution, and belongs to the technical field of industrial boiler and power plant CO2 capture. The heterogeneous catalyst is prepared by loading SO4 < 2-> / metal oxide on an HZSM-5 carrier, and the method comprises the following specific steps: adding sulfate of a metal oxide into water,then adding an HZSM-5 carrier, heating and stirring, cooling and filtering to obtain a precipitate; and washing, drying and roasting the precipitate to obtain the SO4 < 2-> / metal oxide-HZSM-5 heterogeneous catalyst. The heterogeneous catalyst provided by the invention has the advantages that the absorption liquid can be promoted to desorb CO2, and the CO2 absorption performance of absorption liquid is improved; compared with the process of capturing the CO2 in the flue gas without adding a catalyst, the desorption rate is improved by 35-45%, the absorption efficiency is improved by 30-40%, thestability and the recycling performance are good, and the CO2 desorption energy consumption can be greatly reduced.

Description

technical field [0001] The invention belongs to industrial boiler and power plant CO 2 The technical field of capture, especially relates to a method for desorbing CO in solution 2 The preparation method and application of the heterogeneous catalyst. Background technique [0002] my country's energy structure is dominated by coal, and a large amount of CO is emitted after coal burning. 2 It will lead to the greenhouse effect and the extreme climate that comes with it. as CO 2 Largest source of emissions, CO from electricity production 2 accounted for 62.66% of the total source, therefore, from the control of CO 2 From the perspective of emissions, it is first necessary to control the CO emitted during the electricity production process. 2 . Applied to coal-fired power plant CO 2 There are three main technical routes of capture, which are divided into: post-combustion capture, pre-combustion capture and oxygen-enriched combustion. For a large number of existing power...

AI Technical Summary

Problems solved by technology

Although the chemical absorption method has the characteristics of high decarbonization efficiency, simple process, and advantages in removal cost compared with other technologies, the amine-based solution absorption method also has its inherent defects: high reaction heat leads to increased cooling costs; high regeneration energy causes low pressure Maximum steam flow demand and variable regeneration column size; large packed absorber required to provide sufficient mass transfer area for chemical reactions; high linear power loss due to overcoming pressure loss in regeneration column

The combination of the above factors led to the absorption and capture of CO by the amine-based solution. 2 Higher investment of the system, higher operating costs, among them, decarbonization and desorption of CO 2 The energy consumption of the process is large, which will increase the investment and operating costs of equipment by 70%, so reducing CO 2 The problem of high regeneration energy consumption in the capture process is conducive to the large-scale application of carbon capture process in coal-fired power plants

[0003] A large amount of existing research work is focused on the improvement of the amine-based solution absorption system, mainly for the development of new alcohol amine solutions and phase change solvents to reduce CO 2 High energy consumption and low absorption and desorption rates of the capture process

But due to the traditional CO 2 The desorption temperature is between 100°C and 150°C. In this temperature range, the large amount of gasification of water is the main energy consumption. Therefore, the CO 2 desorbs and ensures faster CO 2 Absorption and desorption rates could significantly improve current carbon capture processes

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