Cobalt Phthalocyanine Supported on Mesoporous CeO₂ as an Active Molecular Catalyst for CO Oxidation

Abstract

Heterogenization of biomolecules by immobilizing on a metal oxide support could greatly enhance their catalytic activity and stability, but their interactions are generally weak. Herein, cobalt phthalocyanine (CoPc) molecules were firmly anchored on a Ce-based metal−organic framework (Ce-BTC) due to π−π stacking interaction between CoPc and aromatic frameworks of the BTC linker, which was followed by a calcination treatment to convert Ce-BTC to mesoporous CeO 2 and realize a molecular-level dispersion of CoPc on the surface of CeO 2 . Various characterization results confirm the successful fabrication of molecular-based CoPc/CeO 2 catalysts which exhibited good CO oxidation performance. Importantly, we found that the mixing manner of Ce-BTC and CoPc remarkably affects the physicochemical properties which then determined the catalytic performance of the resultant CoPc/CeO 2 catalysts. In contrast, the direct physical mixing of CoPc and CeO 2 led to poor performance toward CO oxidation, manifesting that the Ce-BTCmediated CoPc loading strategy is promising for the heterogenization of catalytic biomolecules.

Photocatalytic C–N coupling towards urea synthesis with a palladium-supported CeO2 catalyst

“…11,21 Impressively, cerium oxide (CeO 2 ) is an abundantly available and inexpensive functional rare earth material, and has been widely applied in the photocatalysis field due to its unique physical and chemical properties and redox characteristics. 22–24 In addition, a variety of cerium-based materials such as Fe/CeO 2 , ZnO/CeO 2 and CeO 2 /TiO 2 have been also exploited as photocatalysts or co-catalysts for a wide range of reactions, aiming at improving the efficiency in visible light. 25–27…”

“…11,21 Impressively, cerium oxide (CeO 2 ) is an abundantly available and inexpensive functional rare earth material, and has been widely applied in the photocatalysis field due to its unique physical and chemical properties and redox characteristics. [22][23][24] In addition, a variety of cerium-based materials such as Fe/CeO 2 , ZnO/CeO 2 and CeO 2 /TiO 2 have been also exploited as photocatalysts or co-catalysts for a wide range of reactions, aiming at improving the efficiency in visible light. [25][26][27] In view of this, we successfully designed palladium nanoparticle decorated mesoporous CeO 2 nanorods as a photocatalyst to convert both CO 2 and N 2 into urea under ambient conditions, enabling spontaneous electron transfer at the palladium-ceria interface (Scheme 1).…”

Critical role of NiO support morphology for high activity of Au/NiO nanocatalysts in CO oxidation

“…Carbon monoxide oxidation is a crucial catalytic reaction for air pollution control and is relevant in various chemical processes, including the removal of CO in car exhaust streams 1 and the elimination of poisonous CO from synthesis gas streams for upgrading hydrogen gas used as fuel for low-temperature fuel cells. 2 , 3 Heterogeneous catalysis by gold has advanced immensely since the pioneering work of Haruta et al. 4 reporting astoundingly high activity in low-temperature CO oxidation of very small (<5 nm) Au nanoparticles (NPs) deposited on base metal oxides.…”