碳化钴的表面科学及费托合成反应催化性能研究

碳化钴一般被认为没有费托合成反应催化活性，然而最近的研究结果表明碳化钴在费托合成制烯烃反应中具有很好的活性和选择性。因此，我们需要对碳化钴在费托反应中的作用重新认识。本项目将同时采用表面科学和催化科学的方法研究碳化钴的表面结构、相变、费托合成反应催化性能等性质。我们将采用金属单晶为基底，分别在真空、近常压、常压等环境中制备碳化钴，借助XPS、STM、常压反应腔等技术研究碳化钴的化学组成、表面结构、相变、合成气吸附和反应性能。我们还将合成碳化钴粉末催化剂，借助原位XRD、原位TEM、固定床微反等技术对其进行结构、相变以及费托合成反应性能等研究。结合上述两方面的系统研究，我们将更加深刻的理解碳化钴在费托合成反应中的催化作用机理。

Cobalt carbide is traditionally considered to be inert in Fishcer-Tropsch synthesis (FTS). However, recent reports show that cobalt carbide exhibits good activity and selectivity in ‘Fischer-Tropsch to olefins’ (FTO) reaction. This triggers our interest in the study of cobalt carbide in a comprehensive way, aiming to a better understanding its role in FTS. This project is to study the surface structure, phase evolution, and catalytic property of cobalt carbide, with both surface science approach and catalysis research methods. We will synthesize cobalt carbide on metal substrate under vacuum, near ambient pressure, and ambient pressure conditions. Assisted with the techniques such as XPS, STM, ambient pressure reactor, we are able to investigate the chemical composition, surface structure, phase evolution and catalytic properties of the cobalt carbide model catalyst. We will also synthesize cobalt carbide powder catalysts and investigate their structure, phase evolution and catalytic properties using in situ XRD, in situ TEM and fixed bed micro-reactor. These combination studies of cobalt carbide model catalyst and cobalt carbide powder catalyst will lead us to understand how and why cobalt carbide play its role in FTS.