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Elementary Surface Reactions on Co(0001) under Fischer–Tropsch Synthesis Conditions
The Journal of Physical Chemistry C ( IF 3.7 ) Pub Date : 2017-09-21 00:00:00 , DOI: 10.1021/acs.jpcc.7b07531
Yuekang Jin 1 , Guanghui Sun 1 , Zhengming Wang 1 , Haibin Pan 2 , Lingshun Xu 1 , Hong Xu 1 , Weixin Huang 1
Affiliation  

A fundamental understanding of Fischer–Tropsch synthesis (FTS) is challenging but important for catalyst design. We herein report high-resolution photoemission spectroscopic characterizations of a Co(0001) surface pretreated with syngas at different conditions without exposure to air. Elementary surface reactions were observed to sensitively depend on reaction pressures and temperatures. Both direct CO dissociation and H2-assisted CO activation for CO activation occur facilely at 300 K, while the removal of the resulting oxygen adatoms needs high temperatures. Under a typical FTS reaction condition (4 bar and 490 K), the Co(0001) surface is metallic, and direct CO dissociation is the dominant mechanism for CO activation to form irreversibly adsorbed surface intermediates including carbidic carbon, hydrocarbon fragments, atomic oxygen, and hydroxyl groups. These results significantly advance the fundamental understanding of the cobalt-catalyzed FTS process.

中文翻译:

费托合成条件下Co(0001)上的基本表面反应

对费托合成(FTS)的基本理解具有挑战性,但对催化剂设计很重要。我们在此报告了在不暴露于空气的情况下,在不同条件下用合成气预处理过的Co(0001)表面的高分辨率光发射光谱特征。观察到基本的表面反应敏感地取决于反应压力和温度。直接CO解离和H 2都CO活化的辅助CO活化在300 K时很容易发生,而除去生成的氧原子则需要高温。在典型的FTS反应条件下(4 bar和490 K),Co(0001)表面是金属,直接CO解离是CO活化形成不可逆吸附的表面中间体的主要机理,包括碳,碳氢化合物碎片,原子氧,和羟基。这些结果大大提高了对钴催化的FTS过程的基本认识。
更新日期:2017-09-21
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