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( Faisal Zafar ),배종욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The direct conversion CO<sub>2</sub> to value-added chemicals is crucial in mitigating the global warming problem. We prepared the bimetallic catalysts consisting of copper (Cu) and partially reduced indium (In) metal oxide supported on the ordered mesoporous alumina (m-Al), which was synthesized by successive impregnation of In and Cu precursors on the m-Al, to verify the synergy effects of In-Cu metals for CO<sub>2</sub> hydrogenation to methanol. The catalytic activity of the bimetallic In-Cu/m-Al was modified by varying the molar ratio of In to Cu, which altered the physiochemical and geometrical properties of the catalyst. The oxygen vacancies formed on the CuO and In<sub>2</sub>O<sub>3</sub> surface enhanced the activation of CO<sub>2</sub> to form methanol, and the undesired RWGS reaction was greatly suppressed by the strong adsorption of CO<sub>2</sub>.
( Faisal Zafar ),배종욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
CO<sub>2</sub> has been known to be a major chemical for a global warming, therefor the conversion of CO<sub>2</sub> to methanol has been considered as a promising method and it is an important industrial feedstock for the synthesis of various chemicals and a potential alternative to fossil fuels. In the present study, a series of ZrO<sub>2</sub>(x)/CuO-ZnO (ZCZ) catalysts were prepared by physically mixing different phases of ZrO<sub>2</sub> (i.e. a - amorphous, m - monoclinic and t - tetragonal) with CuO-ZnO (7:3) prepared by co-precipitation method. The results showed that the physiochemical properties of the ZCZ catalyst were strongly influenced by the states of the ZrO<sub>2</sub> phases. In addition, the surface area of metallic copper and the ratio of strong Lewis acidic Zr<sup>4+</sup> cation and strong Lewis basic O<sub>2</sub>- anion were also influenced by ZrO<sub>2</sub> phases which was responsible for a higher CO<sub>2</sub> conversion and methanol productivity.
( Faisal Zafar ),배종욱 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
The direct hydrogenation of CO<sub>2</sub> containing syngas to dimethyl ether (DME) is a promising strategy to mitigate the greenhouse gas effect. Due to unique shape selectivity offered by ferrierite towards DME synthesis, we successfully synthesized FER with different morphologies and tested their activity for one-step conversion of reaction gas to DME by forming hybrid CZA/FER catalyst. The reaction results for morphological effect of different FER structures have been evaluated and the structure-activity relationship showed that the nano-sheet ferrierite morphology governed the best activity and selectivity for DME synthesis. This was attributed to the better dispersion of cluster Cu oxides and the generation of optimum Lewis and Brønsted acid sites for direct DME production. The effects of experimental conditions on the activity-selectivity pattern were also investigated, to disclose the effect of reaction variables leading to higher DME selectivity.