Abstract

It is shown that the method of synthesis and source of bismuth greatly affect the physicochemical properties of modified MoVTeNbO catalysts. Adding an organic bismuth compound with a neutral pH at the stage of mixing the solutions of the initial components is accompanied by precipitation and the formation of inactive phases when the required M1 phase is missing. Regardless of the nature of the initial bismuth compound, introducing it into a dry MoVTeNb precursor leads to considerable destruction of it, resulting in a lower content of the M1 phase and the formation of binary V–Mo and Te–Мo oxides. It has been established that the ethylene yield attains a maximum (76.5 %) in the oxidative ethane dehydrogenation (OED)reaction, when the calcined MoVTeNb oxide catalyst is impregnated with a bismuth organic compound solution. The yield of acrylic acid is ≈48% over the same catalyst in the reaction of propane oxidation. Introducing bismuth nitrate into a solution of the initial components is nevertheless a more technologically advanced way of preparing bismuth-containing catalysts. The maximum ethylene yield is ≈76% in the OED reaction over the catalyst obtained using bismuth nitrate.

中文翻译：

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制备MoVTeNbBiO催化剂用于轻烃的选择性氧化转化

摘要

结果表明，铋的合成方法和来源对改性MoVTeNbO催化剂的理化性质影响很大。在混合初始组分的溶液阶段添加具有中性pH值的有机铋化合物会伴随沉淀和缺少所需的M1相而形成惰性相。不管最初的铋化合物的性质如何，将其引入干燥的MoVTeNb前驱物中都会导致其大量破坏，从而导致M1相含量降低，并形成二元V-Mo和Te-Мo氧化物。已经确定，当将煅烧的MoVTeNb氧化物催化剂用铋有机化合物溶液浸渍时，在氧化乙烷脱氢（OED）反应中乙烯收率达到最大（76.5％）。在丙烷氧化反应中，相同催化剂上丙烯酸的收率约为48％。然而，将硝酸铋引入初始组分的溶液中是制备含铋催化剂的技术上更先进的方法。在OED反应中，相对于使用硝酸铋获得的催化剂，最大的乙烯收率约为76％。