Catalytic Decomposition of N<SUB>2</SUB>O on Ordered Crystalline Metal Oxides

Abstract

The synthesis of mesoporous metal oxides using mesoporous silicas or carbons as hard templates has attracted growing interest recently, but the catalytic application of mesoporous metal oxides has not been studied sufficiently. In addition, few publications have compared the catalytic performance of a series of mesoporous metal oxides in the same reaction, and little is known about the influence of preparation details of mesoporous metal oxides on catalytic activity. Herein, ordered crystalline mesoporous metal oxides (i.e., CeO2, Co3O4, Cr2O3, CuO, alpha-Fe2O3, beta-MnO2, Mn2O3, Mn3O4, NiO) prepared using mesoporous SiO2 (KIT-6) as a hard template were tested in the decomposition of N2O, an environmental pollutant, and the catalytic performance was compared with that of commercial metal oxides with low surface areas. In particular, mesoporous Co3O4, beta-MnO2, and NiO showed high N2O conversions at 350 degrees C. The influence of preparation parameters of mesoporous Co3O4 on catalytic activity was then studied in more detail. Mesoporous Co3O4 samples with different pore sizes and wall thicknesses were prepared using KIT-6 synthesized under different hydrothermal or calcination temperatures. Interestingly, the catalytic activities of different mesoporous Co3O4 samples were found to be influenced by these preparation details.

Catalytic decomposition of N2O over Cu–Al–Ox mixed metal oxides

“…E.g. commercial and mesoporous CuO, 3 8 reported signicantly higher activity of Cu-Mg-Al-O x hydrotalcite derived mixed metal oxides than analogues Co-Mg-Al-O x . Cu-Mg-Al-O x with molar ratios of Cu/ Mg/Al ¼ 10/61/29 and calcined at 600 C, reached full N 2 O conversion at 600 C in the presence of O 2 (0.1 g catalyst, 0.5 vol% N 2 O/He, 4.5 vol% O 2 /He, 50 cm 3 min À1 ).…”

Catalytic Decomposition of N2O over Co–Ti Oxide Catalysts: Interaction between Co and Ti Oxide

“…Ma et al. reported that mesoporous Co 3 O 4 possessed especially high catalytic activity . It was reported that the metal oxides containing cobalt showed much higher catalytic performance in the decomposition of N 2 O owing to their relatively high redox properties .…”

Nanosize Control on Porous β-MnO2 and Their Catalytic Activity in CO Oxidation and N2O Decomposition

“…The catalytic reaction condition could be found our previous reports [23,27,28]. Briefly, to test the performance in CO oxidation, 50 mg of catalyst was loaded in in a U-shaped quartz tube, pretreated in 8% O 2 –He at 400 °C for 1 h, and cooled down to 0 °C to allow for CO oxidation.…”