AUTHOR=Wang Xin , Tan Wei , Guo Kai , Ji Jiawei , Gao Fei , Tong Qing , Dong Lin 

TITLE=Evaluation of Manganese Oxide Octahedral Molecular Sieves for CO and C3H6 Oxidation at Diesel Exhaust Conditions

JOURNAL=Frontiers in Environmental Chemistry

VOLUME=2

YEAR=2021

URL=https://www.frontiersin.org/journals/environmental-chemistry/articles/10.3389/fenvc.2021.672250

DOI=10.3389/fenvc.2021.672250

ISSN=2673-4486

ABSTRACT=<p>Mn-based materials have been widely applied in the environmental catalysis field for their excellent redox properties. Here, three kinds of crystallite manganese oxides (pyrolusite, cryptomelane and todorokite) with different tunnel sizes (MnO(1 × 1), MnO(2 × 2), and MnO(3 × 3)) were prepared by hydrothermal method, and their catalytic performance in complete oxidation of diesel vehicle exhaust were tested. The highest catalytic oxidation activity was achieved on MnO(3 × 3) when compared with that on MnO(1 × 1) and MnO(2 × 2). Via a series of characterizations, such as transmission electron microscope, scanning electron microscope, X-ray powder diffraction, N<sub>2</sub>-sorption experiments, temperature-programmed reduction by H<sub>2</sub>/CO, and X-ray photoelectron spectroscopy, <italic>etc.</italic>, it was found that the catalytic activity was mainly determined by the tunnel structure, specific surface area, and redox ability.</p>