Journal
CHEMISTRYSELECT
Volume 6, Issue 9, Pages 2111-2118Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.202100259
Keywords
epoxidation; heterogeneous catalysis; H2O2; organic-inorganic hybrid composites; W; PW species
Categories
Funding
- Natural Science Foundation of Shandong Province [ZR2020QB025, ZR2020ME104]
- National Natural Science Foundation of China [NSFC21376128]
- National College Student Innovation and Entrepreneurship Training Program [S202010454001]
- Natural Science Foundation of Shandong Province, China
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Three two-dimensional hybrid materials based on SBA-15 were successfully synthesized using a post-synthetic functionalization strategy, where peroxo-W and PW species were immobilized on the surface. The catalysts showed significant activity for cyclopentene epoxidation using H2O2 as the oxidant, with SBA-15-ImCl-PF6-W catalyst exhibiting excellent selectivity and SBA-15-NH(PO3H2)-W catalyst showing good cycle performance. The environmentally-friendly process utilized a low dose of heterogeneous catalyst and green oxidant without any co-solvent.
Three two-dimensional SBA-15-based hybrid materials, SBA-15-ImCl-PF6, SBA-15-NH(PO3H2), 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(PO3H2)-W, and SBA-15-N+(PW4O24)(3-) all showed considerable activity for the epoxidation of cyclopentene to cyclopentene oxide using H2O2 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(PO3H2)-W owing robust covalent bonds. Besides, the use of a low dose of heterogeneous catalyst (W=20 mu mol) and a green oxidant of H2O2, along with the absence of co-solvent or other additives make cyclopentene epoxidation reaction an environmenttally benign chemical process.
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