Journal Article

Enhanced Stability of Low-Temperature CO Oxidation over K2CO3 Coupled CuO–MnOx–CeO2 Catalyst in the Presence of CO2, SO2 and NO2

Li, Qian, Lin, Jin, Zhang, Mengqing, Kang, Ning, Lu, Shouxiang

2024

Overview

Deactivation of catalyst for the oxidation of carbon monoxide in the impurity gases such as CO 2 , SO 2 , and NO x are common issues in practical use. In this work, Cu–Mn–Ce composite oxide catalysts (CMCO) were coupled with K 2 CO 3 (KC) to inhibit the poisoning effect of these gases. The CMCO/KC composite catalysts, prepared by multi-step impregnation method, were tested for CO catalytic oxidation and CO 2 chemical absorption in the presence of SO 2 (0.004% and 0.04%) or NO 2 (0.0025% and 0.025%), and further characterized by XRD and XPS. The results showed that CMCO/KC could catalyze CO efficiently at low temperatures, and proper K 2 CO 3 addition (10–50 wt%) could even promote CMCO catalytic activity owing to the CO 2 sorption. Among them, CMCO/50KC showed the highest CO catalytic performance with the T 50 of 114.5 °C. More importantly, K 2 CO 3 doping treatment could reduce or eliminate the catalyst deactivation caused by SO 2 and NO 2 , due to the competitive sorption reaction of the alkali toward the acid gases. Further regeneration experiments revealed that CMCO/KC also had fine regeneration activity and stability for CO/CO 2 removal. Graphical Abstract

• Publisher: Springer US,Springer Nature B.V
• Subject: absorption / Carbon dioxide / Carbon monoxide / Catalysis / Catalysts / Catalytic activity / Catalytic oxidation / Cerium oxides / Chemistry / Chemistry and Materials Science / Copper / Deactivation / Industrial Chemistry/Chemical Engineering / Low temperature / Manganese / Nitrogen dioxide / Organometallic Chemistry / Oxidation / Physical Chemistry / Poisoning (reaction inhibition) / Regeneration / Sorption / Stability / Sulfur dioxide