TY - DATA T1 - Structure Sensitivity of La2O2CO3 Catalysts in the Oxidative Coupling of Methane PY - 2015/03/06 AU - Yu-Hui Hou AU - Wei-Chen Han AU - Wen-Sheng Xia AU - Hui-Lin Wan UR - https://acs.figshare.com/articles/journal_contribution/Structure_Sensitivity_of_La_sub_2_sub_O_sub_2_sub_CO_sub_3_sub_Catalysts_in_the_Oxidative_Coupling_of_Methane/2188954 DO - 10.1021/cs501733r.s001 L4 - https://ndownloader.figshare.com/files/3823120 KW - nanometer scale KW - OCM KW - CO 2. KW - chemisorbed oxygen species KW - shale gas KW - La 2O Catalysts KW - transformation KW - La 2O samples KW - Structure Sensitivity KW - facet KW - 20 times N2 - Methane is the main component of natural gas and shale gas. It is chemically stable, and its activation often requires high temperatures, which lead to its extensive transformation into undesirable products such as CO and CO2. Thus, the development of efficient catalysts for the selective transformation of methane represents a substantial challenge. In this work, we synthesized La2O2CO3 samples with different morphologies (rod- and plate-shapes) at the nanometer scale. We observed that one of the rod-shaped samples exhibited the best catalytic properties among the investigated samples in the oxidative coupling of methane (OCM) at low temperatures (420–500 °C); in addition, its specific activity was 20 times greater than that of any of the other rod-shaped samples. This difference corresponded to the O2-TPD results and was attributed to the crystallographic facets exposed. Among the exposed facets, the (110), (12̅0), and (21̅0) facets had relatively loose atomic configurations that increased the conversion of methane in the OCM. Moreover, these facets were beneficial to the formation of the chemisorbed oxygen species and their moderately basic sites, which improve the selectivity in the OCM. ER -