In order to enhance the catalytic performance of the Gd-modified Co 3 O 4 catalyst (Gd 0.06 Co) for the N 2 O decomposition, alkali metal K was introduced as the promoter by impregnating the Gd 0.06 Co powder with an aqueous solution of KNO 3 (with K/Co ratios 0.01–0.05). With the doping of K, the catalytic activity over Gd 0.06 Co was significantly improved and the temperature of N 2 O complete decomposition was decreased from 350 °C to 300 °C. Combining the results of XPS and O 2 -TPD, the superior catalytic performance of the optimum catalyst K 0.025 Gd 0.06 Co was mainly owing to the synergistic effect of Gd and K, which weakened the Co–O bond and endowed the catalyst surface with much more amount of oxygen vacancies. Even under the coexist of the impurity gases, such as 5 vol% O 2 , 100 ppmv NO and 2 vol% H 2 O, the K 0.025 Gd 0.06 Co catalyst exhibited prominently better catalytic activity than Gd 0.06 Co and K 0.025 Co catalysts.
Solid amine adsorbents hold promising application prospects in the realm of industrial flue gas decarbonization. Nevertheless, there remains a need for substantial improvement in the cycling stability of solid amine adsorbents. Additionally, the competitive adsorption mechanism of solid amine adsorbents pertaining to flue gas components lacks thorough verification. In this study, amine-grafted micro-mesoporous ZSM-5/SBA-16 adsorbents were synthesized to improve the CO 2 adsorption capacity and investigate the effect of impurity gases on CO 2 adsorption. Various characterization techniques, including X-ray diffraction (XRD), thermogravimetric analysis (TGA), N 2 adsorption, and elemental analysis, were employed to analyze the properties of the adsorbents. The loading analysis of the micro-mesoporous molecular sieve revealed that ZS-A-2.0 exhibited the highest CO 2 adsorption capacity of 41.39 mg/g. Mass spectrometry was utilized to evaluate the co-adsorption experimentation involving multicomponent gases. The breakthrough curves of CO 2 displayed dual stages at low concentrations, suggesting the simultaneous occurrence of physical and chemical adsorption throughout the entire adsorption process. Based on temperature programming desorption (TPD) and in situ Fourier transform infrared spectroscopy (FTIR), the results indicated a notable enhancement in CO 2 adsorption due to the presence of H 2 O. Conversely, the presence of SO 2 and NO exhibited adverse effects on CO 2 adsorption, consequently hindering the formation of carbamate and (RNH 3 ) 2 CO 3 adsorption products. This study presents, for the first time, a comprehensive investigation into the interactive adsorption mechanism and product distribution between CO 2 and impurity gases. The findings presented herein provide valuable insights and essential support for practical flue gas applications.
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