首页|Efficient and eco-friendly carbon dioxide capture with metal phosphate catalysts in monoethanolamine solutions

Efficient and eco-friendly carbon dioxide capture with metal phosphate catalysts in monoethanolamine solutions

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Catalytic carbon dioxide(CO2)desorption has emerged as a promising approach to enhance the effi-ciency of CO2 capture while minimizing energy demands,crucial for advancing chemical absorption methods.This study investigates the catalytic potential of three metal phosphates(aluminium phosphate(AlPO4),cobaltous phosphate(Co3(PO4)2),and zinc phosphate(Zn3(PO4)2))in improving the MEA(monoethanolamine)-based CO2 absorption-desorption performance.Among the catalysts tested,AlPO4 demonstrated superior performance,enhancing CO2 absorption capacity by 4.2％to 9.3％and desorption capacity by 12.3％to 22.7％across five cycles.Notably,AlPO4 increased the CO2 desorption rate by over 104.4％at a desorption temperature of 81.3 ℃,simultaneously reducing the required sensible heat by 12.3％to 22.7％,compared to processes without catalysts.The improved efficiency is attributed to AlPO4's ability to effectively transfer hydrogen protons from protonated MEA to carbamate,thereby facilitating the decomposition of carbamate and regenerating CO2.This research introduces a viable,cost-effective,and eco-friendly solid acid catalyst strategy for CO2 desorption,contributing to the development of more energy-efficient CO2 capture technologies.

CO2CO2 captureCatalytic desorptionEnergy reductionMetal phosphateStability

Chunjin Zhang、Xue Yao、Linlin Chen、Hua Tang、Siming Chen

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School of Environmental Science and Engineering,Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao,Qingdao University,Qingdao 266075,China

Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization,China University of Mining and Technology,Xuzhou 221008,China

Carbon Neutralization Institute,China University of Mining and Technology,Xuzhou 221008,China

School of Chemical Engineering,China University of Mining and Technology,Xuzhou 221008,China

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2024

10.1016/j.cjche.2024.06.023

中国化学工程学报(英文版)
中国化工学会

中国化学工程学报(英文版)

CSTPCDEI
影响因子：0.818
ISSN：1004-9541
年,卷(期)：2024.75(11)