Assembly of SBA‐15 Derived Hybrid Heterogeneous Catalysts for Liquid Phase Cyclopentene Epoxidation. Issue 9 (1st March 2021)

• Record Type: Journal Article
• Authors: Niu, Qingtao; Liu, Guodong; Lv, Zhiguo; Si, Chongdian; Jin, Manman
• Is Part Of: ChemistrySelect. Volume 6:Issue 9(2021)
• Page Start: 2111
• Page End: 2118
• Publication Date: 2021-03-01
• Subjects: epoxidation -- heterogeneous catalysis -- H2O2 -- organic-inorganic hybrid composites -- W/PW species; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202100259
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Three two‐dimensional SBA‐15‐based hybrid materials, SBA‐15‐ImCl‐PF6, SBA‐15‐NH(PO3 H2 ), and SBA‐15‐N +, were synthesized employing a post‐synthetic functionalization strategy, and peroxo‐W and PW species were successfully immobilized on the surface of the corresponding organic moieties‐modified SBA‐15 via electrostatic interaction or covalent linking. The TEM and XRD results presented that the structure and morphology of SBA‐15 were maintained after multiple transformations. The final catalysts SBA‐15‐ImCl‐PF6 ‐W, SBA‐15‐NH(PO3 H2 )‐W, and SBA‐15‐N + (PW4 O24 ) 3− all showed considerable activity for the epoxidation of cyclopentene to cyclopentene oxide using H2 O2 as the oxygen source without any co‐solvent. It was noteworthy that SBA‐15‐ImCl‐PF6 ‐W catalyst with increased hydrophobicity via altering counteranions of imisazolium ions exhibited excellent cyclopentene oxide selectivity (99 %), but a good cycle performance (10 times) was achieved via SBA‐15‐NH(PO3 H2 )‐W owing robust covalent bonds. Besides, the use of a low dose of heterogeneous catalyst (W=20 μmol) and a green oxidant of H2 O2, along with the absence of co‐solvent or other additives make cyclopentene epoxidation reaction an environmenttally benign chemical process. Abstract : Three novel, hybrid, and heterogeneous catalysis materials were synthesized and screened for cyclopentene epoxidation with H2 O2 . The results indicated that increased hydrophobicity via altering counteranions endows SBA‐15‐ImCl‐PF6 ‐W excellent catalytic activity and robust covalent bonds provides SBA‐15‐NH(PO3 H2 )‐W splendid recyclability, and extremely low dose of hybrid catalyst, H2 O2, along with the absence of co‐solvent make cyclopentene epoxidation an environmenttally benign chemical process.