Xu Junwei, Xi Rong, Gong Ying, Xu Xianglan, Liu Yameng, Zhong Xusheng, Fang Xiuzhong, Wang Xiang
Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, P. R. China.
Inorg Chem. 2022 Jul 25;61(29):11419-11431. doi: 10.1021/acs.inorgchem.2c01754. Epub 2022 Jul 12.
To investigate the influence of surface acidity and basicity on the OCM reaction, four pure-phase YBO (B = Ti, Sn, Zr, Ce) compounds have been purposely constructed. The exquisite phase structure change results in the generation of different amounts of surface active O and O sites, which affects CH molecule activation. Furthermore, both Lewis acidic sites and basic sites are formed on the catalysts in different amounts, which are related to the lattice disorder extent and the choice of A- and B-site elements. It is elucidated with strong evidence that the surface basic sites are favorable to C product selectivity, but the surface acidic sites lead to deep oxidation of CH and the coupling products to form CO. To design and fabricate YBO catalysts with better C product selectivity for the reaction, a disordered defect fluorite structure should be engineered with A- and B- site elements having appropriate basicity.
