Premium
Effect of Crystal Phase of MnO 2 with Similar Nanorod‐Shaped Morphology on the Catalytic Performance of Benzene Combustion
Author(s) -
Hu Zhun,
Mi Rongli,
Yong Xiang,
Liu Shuang,
Li Dan,
Li Yu,
Zhang Tao
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802033
Subject(s) - catalysis , x ray photoelectron spectroscopy , desorption , benzene , manganese , thermal desorption spectroscopy , adsorption , chemistry , catalytic combustion , inorganic chemistry , materials science , chemical engineering , organic chemistry , engineering
Four manganese oxides with different crystal structures in the similar nanorod‐shaped morphology were synthesized and investigated for the catalytic combustion of benzene. The physicochemical properties of the materials were characterized by N 2 physisorption‐desorption, transmission electron microscope (TEM), X‐ray photoelectron spectroscopy (XPS), Raman spectra, O 2 temperature programmed desorption (O 2 ‐TPD) and temperature programmed surface reaction (TPSR). The catalytic activities on benzene combustion over various manganese oxides decreased in the order: γ‐MnO 2 > β‐MnO 2 > α‐MnO 2 > δ‐MnO 2 . The activation energy of benzene combustion over γ‐MnO 2 (67.4 kJ/mol) was lower than that over α‐MnO 2 (69.2 kJ/mol), β‐MnO 2 (79.1 kJ/mol) and δ‐MnO 2 (85.2 kJ/mol). The TPSR results with or without gaseous oxygen revealed that the reaction pathway was occurred via MVK mechanism. The surface adsorbed oxygen species concentration and low temperature O 2 desorption of these manganese oxides, determined by XPS and O 2 ‐TPD, decreased in the order of γ‐MnO 2 > β‐MnO 2 > α‐MnO 2 > δ‐MnO 2 , are in good agreement with the sequence of their catalytic performance on benzene combustion. It is concluded that higher surface adsorbed oxygen species ratio and better low temperature O 2 desorption were crucial to the superior catalytic performance of the α‐MnO 2 , β‐MnO 2 , γ‐MnO 2 and δ‐MnO 2 materials.