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| 1 | Active oxygen center in oxidative coupling of methane on La_(2)O_(3) catalyst显示文摘La_(2)O_(3) catalyzed oxidative coupling of methane(OCM) is a promising process that converts methane directly to valuable C_(2)(ethylene and ethane) products. Our online MS transient study results indicate that pristine surface without carbonate species demonstrates a higher selectivity to C_(2) products, and a lower light-off temperature as well. Further study is focused on carbonate-free La_(2)O_(3) catalyst surface for identification of active oxygen species associated with such products behavior. XPS reveals unique oxygen species with O 1 s binding energy of 531.5 e V correlated with OCM catalytic activity and carbonates removal. However, indicated thermal stability of this species is much higher than the surface peroxide or superoxide structures proposed by earlier computation models. Motivated by experimental results,DFT calculations reveal a new more stable peroxide structure, formed at the subsurface hexacoordinate lattice oxygen sites, with energy 2.18 e V lower than the previous models. The new model of subsurface peroxide provides a perspective for understanding of methyl radicals formation and C_(2) products selectivity in OCM over La_(2)O_(3) catalyst. | Xiaohong Zhou Yaoqi Pang Zebang Liu Evgeny I.Vovk Alexander Pvan Bavel Shenggang Li Yong Yang | 2021 | Journal of Energy Chemistry2021，30，9： | 2 |
| 2 | 地域传承视角下传统外墙材料的现代演绎探究显示文摘随着城市化进程加快,现代建造技术的提高,传统外墙材料因其适应性和经济性的掣肘而处于僵化的发展境地。如何在新时代背景下体现传统地域特色,如何活化利用传统外墙材料已成为重要课题。文章从地域传承视角出发,分析了传统外墙材料失“活”的表征及缘由,对地域传承与传统外墙材料的联系进行剖析,深入研究了传统外墙材料的案例经验,从材料本质、建造工艺、外墙肌理、废旧材料等方面提出适应本土建造现实的传统外墙材料演绎趋向,旨在为传统外墙材料的可持续发展提供理论参考。 | 韩琦桦 韦昭 | 2023 | 建筑与文化2023，，9： | 0 |
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