Metalloporphyrins Immobilized on Silica and Modified Silica as Catalysts in Heterogeneous Processes
Shirley Nakagaki, Gabriel K.B. Ferreira, Alex L. Marcalb and Katia J. Ciuffi
Affiliation: Universidade Federal do Paraná, Departamento de Química -Laboratório de Bioinorgânica e Catálise, CP 19081, CEP 81531- 980, Curitiba, Paraná, Brazil.
Metalloporphyrins effectively catalyze C-H bond functionalization, including C-O (hydroxylation), C-N (amination), and C-C
bond formation (carbene insertion). Over the last 20 years, numerous papers have reported that these complexes display catalytic efficiency
and selectivity (regioselectivity and enantioselectivity) in solution (homogeneous catalysis). Green chemistry advocates idealization
and production of more efficient, selective, and preferably recyclable catalysts to develop technological processes that are increasingly
aligned with the principles. This has encouraged investigations into processes that can heterogenize efficient metalloporphyrin
(MP) catalysts. Indeed, scientists have more and more often used heterogeneous catalysis as a tool to design clean and green processes. In
this context, silica and its many functionalized derivatives represent an excellent strategy to obtain inexpensive, inert, and often highly
pure (depending on the preparation route) supports to immobilize catalytic species. In this review, we intend to address this issue.
Keywords: Catalysis, heterogeneous catalysis, immobilization, oxidation reaction, porphyrin, silica.
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