Kinetic and mechanistic insights into the roles of protonated morpholine species and weak acidic environment in methylacrolein production catalyzed by morpholine/acid

Zhao, Qian; Zhao, Hui; Wang, Gang; Yan, Hanwen; Zhang, Junping; Cao, Yingnan

doi:10.1016/j.cej.2022.140409

Cited by 3 publications

(1 citation statement)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…18 In addition to experimental studies, Yan et al investigated the detailed reaction mechanism over anionic liquid catalysts by the density functional theory method and revealed the cooperation effect between sec-amine and aliphatic acid in enhancing MAL synthesis. 19 Apart from linear alkyl amines, cyclic sec-amines, such as L-proline 20 and morpholine, 21 were discovered to exhibit significant catalytic efficiency. However, as most of the processes were catalyzed by aqueous sec-amine solutions and performed in batch reactors, the product separation and catalyst recovery are intractable.…”

Section: Introductionmentioning

confidence: 99%

Continuous Synthesis of Methacrolein over Sulfonic Acid Resin Catalysts: Unraveling the Effect of Acid Strength and Solvent Permittivity

Zhang,

Bian,

Wang

et al. 2023

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

Herein, a novel continuous fixed-bed process for methacrolein (MAL) production via aldol condensation of formaldehyde with propionaldehyde over a sulfonic acid resin was developed, which exhibited high efficiency and remarkable catalytic stability. The influence of Brønsted acid strength and solvent permittivity on aldol reaction was revealed, and the optimal sulfonic acid resin (NKC-9) with suitable acid strength (H 0 = 0.46) was identified. Meanwhile, the occupancy of water molecules on acid sites, which would lead to side reactions and catalyst deactivation, could be effectively inhibited through the construction of a liquid−solid catalytic system in non-polar media. The propionaldehyde conversion and MAL yield could reach up to 97.3 and 90.1% after optimization using the response surface method, respectively. Kinetic studies revealed that the surface reaction was the rate-limiting step with an activation energy of 57.1 kJ/ mol. No deactivation behavior was observed for this kind of catalyst after 300 h on stream.

show abstract