The catalytic oxidation of propylene: VI. Mechanistic studies utilizing isotopic tracers
The catalytic oxidation of propylene: VI. Mechanistic studies utilizing isotopic tracers
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丙烯的催化氧化：VI．
DOI：
10.1016/0021-9517(80)90378-4
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发表时间：
1980
影响因子：
7.3
通讯作者：
G. Keulks
中科院分区：
文献类型：
--
作者：
L. Krenzke;G. Keulks
丙烯氧化的机理已经在特征良好的选择性氧化催化剂上进行了研究：Bi2Mo3O12、Bi2MoO6 和 Bi3FeMo2O12。 Oxygen-18 和氘代丙烯在 350 至 450 °C 温度范围内的稳态反应条件下用作示踪剂。这些数据表明丙烯醛完全是通过钼酸盐催化剂上的氧化还原机制形成的，并且涉及许多晶格氧子层。二氧化碳是通过 Bi2Mo3O12 和 Bi2MoO6 上的丙烯醛连续氧化以及 Bi3FeMo2O12 上的连续和平行途径形成的。丙烯醛形成的限速步骤是从丙烯中夺取烯丙基氢。
The mechanism of propylene oxidation has been investigated over well-characterized selective oxidation catalysts: Bi2Mo3O12, Bi2MoO6, and Bi3FeMo2O12. Oxygen-18 and deuterated propylene were used as tracers under steady-state reaction conditions over the temperature range 350 to 450 °C. These data indicate that acrolein is formed exclusively via the redox mechanism over the molybdate catalysts and that numerous sublayers of lattice oxygen are involved. Carbon dioxide is formed by the consecutive oxidation of acrolein over Bi2Mo3O12and Bi2MoO6and by the consecutive and parallel pathways over Bi3FeMo2O12. The rate-limiting step of acrolein formation is the abstraction of an allylic hydrogen from propylene.