CeO 2 /CuO x Nanostructured Films for CO Oxidation and CO Oxidation in Hydrogen-Rich Streams Using a Micro-Structured Reactor

CABELLO, ANA P.; ULLA, MARÍA A.; ZAMARO, JUAN M.

TOPICS IN CATALYSIS

SPRINGER/PLENUM PUBLISHERS

Año: 2019

1022-5528

The CO oxidation reaction has a strong implication in environmental catalysis; besides a promising performance of CeO 2 /CuO x systems in inverse configuration has been demonstrated, in which ceria is deposited in larger copper oxide particles that act as support. In this work, in situ growths of nanostructured copper oxide films (CuO x ) modified with ceria nanoparticles (Nps) were obtained, which were studied in the CO oxidation and the CO oxidation in hydrogen-rich streams (COProx). There was an effective stabilization of ceria Nps on the nanometric crystals of CuO x growths and the CeO 2 /CuO x films exhibited an enhanced activity in the oxidation of CO and COProx due to new active sites developed at the contact interface between both oxide nanostuctures. The microreactors were stable for 24 h in reaction at high conversion levels without deactivating, thus preserving the high synergy between CeO 2 and CuO x . In COProx, the selectivity at high temperature was also improved by reducing the amount of oxygen in the reagents stream that lowered the contribution of the H 2 oxidation undesirable reaction. Micro-structured reactors with inverse CeO 2 /CuO x phase have potential as a simple low cost alternative with high performance in the oxidation of CO in both air and hydrogen-rich streams.