Propene ammoxidation to acrylonitrile (ACN) over bismuth molybdate-based catalysts has been commercialized for more than 60 years. To meet forecasted growth, there is an opportunity for smaller-scale, decentralized ACN production. Forced dynamic operation (FDO), here referring to step changes in reactant inlet concentrations, has been used in low-volume production applications and has shown advantages in partial oxidation reactions. As a proof-of-concept study to evaluate FDO for acrylonitrile production, we applied periodic changes in inlet gas concentrations that varied between one phase containing all reactants and another that just contained O, over an industrial bismuth molybdate-based catalyst. We varied the cycle period, duty cycle, and O concentration in the second phase and show that improved acrylonitrile yields can be obtained compared with those of steady-state operation under certain conditions. A correlation between lattice oxygen availability and FDO performance was observed.

中文翻译：

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使用强制动态操作在工业钼酸铋基催化剂上进行丙烯氨氧化


使用钼酸铋基催化剂将丙烯氨氧化为丙烯腈 (ACN) 的商业化已有 60 多年的历史。为了满足预期的增长，有机会进行小规模、分散的乙腈生产。强制动态操作（FDO）在这里指的是反应物入口浓度的阶跃变化，已用于小批量生产应用，并在部分氧化反应中显示出优势。作为评估丙烯腈生产中 FDO 的概念验证研究，我们在工业钼酸铋基催化剂上应用了入口气体浓度的周期性变化，该浓度在包含所有反应物的一个相和仅包含 O 的另一个相之间变化。我们改变了第二阶段的循环周期、占空比和 O2 浓度，结果表明，与某些条件下的稳态操作相比，可以获得更高的丙烯腈收率。观察到晶格氧可用性和 FDO 性能之间的相关性。