通过控制Ru的煅烧气氛增强Ru–Na–Ca/γ–Al2O3双功能材料的二氧化碳吸附和甲烷加氢性能
Enhancement of the CO2 adsorption and hydrogenation to CH4 capacity of Ru–Na–Ca/γ–Al2O3 dual function material by controlling the Ru calcination atmosphere
Alejandro Bermejo-López, Beñat Pereda-Ayo, Jon A. Onrubia-Calvo, José A. González-Marcos, Juan R. González-Velasco*
https://doi.org/10.1016/j.jes.2023.08.041
Abstract
Integrated CO2 capture and utilization (ICCU) technology requires dual functional materials (DFMs) to carry out the process in a single reaction system. The influence of the calcination atmosphere on efficiency of 4% Ru-8% Na2CO3-8% CaO/γ-Al2O3 DFM is studied. The adsorbent precursors are first co-impregnated onto alumina and calcined in air. Then, Ru precursor is impregnated and four aliquotes are subjected to different calcination protocols: static air in muffle or under different mixtures (10% H2/N2, 50% H2/N2 and N2) streams. Samples are characterized by XRD, N2 adsorption-desorption, H2 chemisorption, TEM, XPS, H2-TPD, H2-TPR, CO2-TPD and TPSR. The catalytic behavior is evaluated, in cycles of CO2 adsorption and hydrogenation to CH4, and temporal evolution of reactants and products concentrations is analyzed. The calcination atmosphere influences the physicochemical properties and, ultimately, activity of DFMs. Characterization data and catalytic performance discover the acccomodation of Ru nanoparticles disposition and basic sites is mostly influencing the catalytic activity. DFM calcined under N2 flow (RuNaCa-N2) shows the highest CH4 production (449 µmol/g at 370°C), because a well-controlled decomposition of precursors which favors the better accomodation of adsorbent and Ru phases, maximizing the specific surface area, the Ru-basic sites interface and the participation of different basic sites in the CO2 methanation reaction. Thus, the calcination in a N2 flow is revealed as the optimal calcination protocol to achieve highly efficient DFM for integrated CO2 adsorption and hydrogenation applications.
通讯作者
Juan R. González-Velasco，工作单位为西班牙巴斯克大学化学工程系。
原文链接
https://www.sciencedirect.com/science/article/pii/S1001074223003959
引用格式
Alejandro Bermejo-López, Beñat Pereda-Ayo, Jon A. Onrubia-Calvo, José A. González-Marcos, Juan R. González-Velasco, 2024. Enhancement of the CO2 adsorption and hydrogenation to CH4 capacity of Ru–Na–Ca/γ–Al2O3 dual function material by controlling the Ru calcination atmosphere. J. Environ. Sci. 140, 292-305.
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