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Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
Published on: June 21, 2017
Cinnamic Acid-Assisted Synthesis of TS-1 Zeolite via π-Conjugation Regulation for Enhanced Alkene Epoxidation
Xiongyi Yao1, Fan Hu1, Xiaolin Luo2
1Institute for Energy Research, Jiangsu University, Zhenjiang212013, P. R. China.
Abstract:
Designing high-performance TS-1 zeolites while suppressing the formation of extra-framework anatase TiO2 remains a significant challenge. In this work, cinnamic acid (CA), an aromatic acid bearing a π-conjugated side chain, was employed as a zeolite growth modifier to regulate the hydrothermal crystallization process of TS-1. Comprehensive characterization confirmed that the optimized TS-1-0.1 is free of anatase TiO2, with a substantially higher framework Ti content than conventional TS-1. Hence, TS-1-0.1 achieved a 1-hexene conversion of 32.4%, representing a 50% improvement over conventional TS-1 (21.6%). Theoretical calculations and comparative studies with hydrocinnamic acid reveal that the π-conjugated side chain of CA weakens its coordination with Ti species, facilitating the incorporation of Ti into the zeolite framework. This work establishes side-chain conjugation as a previously unrecognized structural parameter for aromatic acid-mediated zeolite crystallization, providing a molecular-level design principle for zeolite growth modifiers.
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