Forced dynamic operation of propylene selective oxidation to acrolein on bismuth-molybdate structured catalysts

IF 4.8 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-02-05 DOI:10.1016/j.apcata.2024.120034

Mohammad Moniruzzaman , Lars C. Grabow , Michael P. Harold

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Abstract

Forced dynamic operation (FDO) of selective oxidation of propylene to acrolein is evaluated on a structured alumina foam coated with a mixed metal oxide catalyst (bismuth molybdate-based). Reactor experiments examine feed composition modulation as a strategy to increase the yield of acrolein. At lower temperatures, separating the oxidant (O₂) and reductant (C₃H₆) enhances propylene conversion and acrolein selectivity. Variation in the reaction-regeneration switching amplitude and frequency gives a 40 % higher cycle-averaged acrolein yield compared to steady-state operation (SSO) for the same overall feed composition. The results suggest that FDO maintains a higher concentration of selective oxygen species during the propylene feed, while pre-oxidation of the catalyst maximizes the amount of selective oxygen species, leading to increased acrolein yield at the beginning of the reaction cycle. Experiments at lower temperature for both commercial promoted and in-house, unpromoted catalysts reveal both catalysts are most active and selective at their highest oxidation states.

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钼酸铋结构催化剂上丙烯选择性氧化制丙烯醛的强制动态操作

在涂有混合金属氧化物催化剂（钼酸铋基）的结构化氧化铝泡沫上，研究了丙烯选择性氧化制丙烯醛的强制动态操作（FDO）。反应器实验检验了饲料组成调节作为一种提高丙烯醛产量的策略。在较低温度下，分离氧化剂（O2）和还原剂（C3H6）提高丙烯转化率和丙烯醛选择性。与稳态操作（SSO）相比，在相同的总体进料组成下，反应再生开关振幅和频率的变化使循环平均丙烯醛产率提高40 %。结果表明，在丙烯进料过程中，FDO保持了较高的选择性氧浓度，而催化剂的预氧化使选择性氧的数量最大化，导致丙烯醛收率在反应周期开始时增加。在较低温度下对商业促进和内部未促进的催化剂进行的实验表明，这两种催化剂在其最高氧化态时都是最活跃和选择性的。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.