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Particle Size Effects of Cobalt Carbide for Fischer–Tropsch to Olefins
ACS Catalysis ( IF 11.3 ) Pub Date : 2018-12-11 00:00:00 , DOI: 10.1021/acscatal.8b03631 Yuanyuan Dai 1, 2 , Yonghui Zhao 1 , Tiejun Lin 1 , Shenggang Li 1, 3 , Fei Yu 1, 2 , Yunlei An 1, 2 , Xinxing Wang 1, 2 , Kang Xiao 4 , Fanfei Sun 2, 5 , Zheng Jiang 5 , Yongwu Lu 1 , Hui Wang 1 , Liangshu Zhong 1, 3 , Yuhan Sun 1, 3
ACS Catalysis ( IF 11.3 ) Pub Date : 2018-12-11 00:00:00 , DOI: 10.1021/acscatal.8b03631 Yuanyuan Dai 1, 2 , Yonghui Zhao 1 , Tiejun Lin 1 , Shenggang Li 1, 3 , Fei Yu 1, 2 , Yunlei An 1, 2 , Xinxing Wang 1, 2 , Kang Xiao 4 , Fanfei Sun 2, 5 , Zheng Jiang 5 , Yongwu Lu 1 , Hui Wang 1 , Liangshu Zhong 1, 3 , Yuhan Sun 1, 3
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Particle size effects of the cobalt carbide (Co2C) catalyst on its catalytic performance for Fischer–Tropsch to olefins were investigated. When the Co2C nanoparticles were smaller than 7 nm, increasing the particle size led to enhanced intrinsic activity based on the turnover frequency (TOF), higher selectivity to lower olefins, higher ratio of olefin to paraffin, and lower methane selectivity. However, when the Co2C nanoparticles were larger than 7 nm, both intrinsic activity and product selectivity did not depend on the particle size. Further kinetic studies showed that both the apparent activation energy and the reaction order of H2 decreased, while the reaction order of CO increased with decreasing Co2C particle size when the size was smaller than 7 nm. In contrast, these kinetic parameters were nearly constant when the Co2C particle size was larger than 7 nm. Theoretical analysis revealed a strong correlation between the exposed facets and Co2C particle sizes, leading to the observed dependence of catalytic performance on the catalyst particle size.
中文翻译：
费托合成烯烃的碳化钴的粒度影响
研究了碳化钴（Co 2 C）催化剂对费托合成烯烃的催化性能的粒径效应。当Co 2 C纳米粒子小于7 nm时，增加颗粒尺寸会导致内在活性提高，这基于周转频率（TOF），对低级烯烃的更高选择性，更高的烯烃与石蜡比以及更低的甲烷选择性。但是，当Co 2 C纳米粒子大于7 nm时，固有活性和产物选择性均不取决于粒径。进一步的动力学研究表明，表观活化能和H 2的反应顺序均降低，而CO的反应顺序随Co 2的降低而增加。粒径小于7nm时的C粒径。相反，当Co 2 C粒径大于7 nm时，这些动力学参数几乎恒定。理论分析表明，暴露的小平面与Co 2 C粒径之间存在很强的相关性，导致观察到的催化性能对催化剂粒径的依赖性。
更新日期：2018-12-11
中文翻译：
费托合成烯烃的碳化钴的粒度影响
研究了碳化钴（Co 2 C）催化剂对费托合成烯烃的催化性能的粒径效应。当Co 2 C纳米粒子小于7 nm时，增加颗粒尺寸会导致内在活性提高，这基于周转频率（TOF），对低级烯烃的更高选择性，更高的烯烃与石蜡比以及更低的甲烷选择性。但是，当Co 2 C纳米粒子大于7 nm时，固有活性和产物选择性均不取决于粒径。进一步的动力学研究表明，表观活化能和H 2的反应顺序均降低，而CO的反应顺序随Co 2的降低而增加。粒径小于7nm时的C粒径。相反，当Co 2 C粒径大于7 nm时，这些动力学参数几乎恒定。理论分析表明，暴露的小平面与Co 2 C粒径之间存在很强的相关性，导致观察到的催化性能对催化剂粒径的依赖性。
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