논문 해외 국제전문학술지(SCI급) Hierarchical LTL Zeolite as an Efficient and Sustainable Solid Acid Catalyst for Replacing HCl in the Production of Polyurethane Intermediates
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2023-06
- 저자명 Lee, S., Park, Y., Baik, Y., Kim, J.-C., Lee, Y.,* and Choi, M.*
- 학술지명 Angew. Chem. Int. Ed.
- 발행처명 Wiley
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 6
- 원문 링크 https://onlinelibrary.wiley.com/doi/10.1002/anie.202304244
홈페이지논문 초록 (Abstract)
In many industrially important reactions, caustic mineral acid catalysts have been successfully replaced with green solid acids such as zeolites. In this context, extensive efforts have been devoted to replacing HCl to produce methylenedianiline (MDA), a key intermediate in polyurethane production. Unfortunately, limited success has been achieved thus far due to low activity, selectivity towards the desired 4,4′-MDA, and rapid catalyst deactivation. Here we report that meso-/microporous hierarchical LTL zeolite exhibits unprecedentedly high activity, selectivity, and stability. The one-dimensional cage-like micropores of LTL promote the bimolecular reaction between two para-aminobenzylaniline intermediates to selectively produce 4,4′-MDA and inhibit the formation of undesired isomers and heavy oligomers. Meanwhile, the secondary mesopores alleviate mass transfer limitations, resulting in a 7.8-fold higher MDA formation rate compared to solely microporous LTL zeolite. Due to suppressed oligomer formation and fast mass transfer, the catalyst exhibits inappreciable deactivation in an industrially relevant continuous flow reactor.