In Situ Processing of a Porous Calcium Zirconate/Magnesia Composite with Platinum Nanodispersion and Its Influence on Nitric Oxide Decomposition

A porous CaZrO 3 /MgO composite with ∼1% nanodispersed platinum was synthesized in air using several in situ reactions, including the pyrolysis of PtO 2 . The composite had a uniformly open, three‐dimensional pore structure (porosity of 56%), with a narrow pore‐size distribution. Catalytic NO decomposition to N 2 and O 2 and NO reduction by C 2 H 4 were investigated up to 900°C. In the absence of oxygen, the NO conversion rate reached ∼52% for the direct decomposition and ∼100% for the reduction by C 2 H 4 . The results suggested the possibility of the porous composite as a multifunctional filter for simultaneous filtering of hot gas and removal of NO x .