Herein, we report on the activity and selectivity of bulk γ‐Mo₂N catalysts for Fischer–Tropsch lower olefin (FTO) synthesis. An increase in surface area and a decrease in crystallite size were observed for γ‐Mo₂N catalysts prepared with the increased molar amount of citric acid (CA), used as a chelating agent during the catalyst synthesis. The reaction products were mainly C₂–C₃ hydrocarbons in the temperature range of 230–300°C at 2 MPa with a reactant feed composition of CO:H₂:Ar = 42.7:34.6:20.8 and a gas hourly space velocity (GHSV) of 1.3 mol/(g_cat.h). The catalytic activity of the γ‐Mo₂N catalysts increased with increased CA:Mo molar ratio and with temperature. However, the hydrogenation activity of the catalysts also increased, resulting in increased selectivity to paraffins. Selectivity to olefins prefers low CA:Mo, that is, low surface area and large crystallite size of γ‐Mo₂N. The γ‐Mo₂N catalyst prepared with a CA:Mo ratio of 1 had 56.4 C atom% C₂₊ hydrocarbon selectivity, 62.4% of which was olefin with 37.8 C atom% selectivity to propylene at 275°C.

中文翻译：

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合成气可比用柠檬酸制备的大量Mo2N催化剂还原烯烃

在此，我们对活性和散装的选择性报告γ-沫_2种Ñ催化剂用于费-托低级烯烃（FTO）的合成。观察到表面积和增加的微晶尺寸的减小对于γ-沫_2个与制备的N-催化剂增加（CA）柠檬酸的摩尔量，在催化剂合成过程中用作螯合剂。反应产物主要是温度为230-300°C，压力为2 MPa的C ₂ -C ₃烃，反应物进料组成为CO：H ₂：Ar = 42.7：34.6：20.8和气时空速（GHSV） ）1.3摩尔/（克_猫.h）中。所述的催化活性γ-沫₂N催化剂随CA：Mo摩尔比的增加和温度的升高而增加。然而，催化剂的氢化活性也增加，导致对石蜡的选择性增加。选择性的烯烃倾向于低CA：沫，即，低表面积和γ-沫的大晶粒尺寸₂ N的γ-沫₂用CA制备的N-催化剂：1 Mo比有56.4的C原子％C ₂₊烃的选择性，其中62.4％是在275℃下对丙烯具有37.8C原子％的选择性的烯烃。