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Controllable preparation of γ-MnO2 by precursor conversion method and its catalytic combustion performance of toluene
Received date: 2021-11-17
Online published: 2022-06-22
Three groups of γ-MnO2 catalysts（Mn-N，Mn-S，Mn-A） were prepared by disproportionation reaction between Mn3O4 and nitric acid，sulfuric acid，and acetic acid，respectively.The effect of different acid on the structure and morphology of the products was studied.The physical and chemical properties of the products were systematically analyzed by X-ray diffraction（XRD），scanning electron microscopy（FE-SEM），transmission electron microscopy（HR-TEM），nitrogen adsorption desorption，X-ray photoelectron spectroscopy（XPS），hydrogen temperature programmed reduction（H2-TPR） and oxygen temperature programmed desorption（O2-TPD）.And toluene catalytic combustion was used as a probe reaction to evaluate the activity of γ-MnO2 catalyst.The results showed that the catalyst Mn-N treated with nitric acid had the best catalytic combustion activity for toluene.Under the condition of mass space velocity of 40 000 mL/（g·h），the ignition temperature T10（corresponding conversion of 10%） was 190 ℃，and the complete combustion temperature T90（corresponding conversion of 90%） was 229 ℃.This may be related to its large specific surface area，high content of Mn（Ⅲ） and adsorbed oxygen species，good reducibility and lattice oxygen flow ability.In addition，Mn-N could still maintain good catalytic activity after continuous stability experiments for 30 h.
Key words： precursor conversion; Mn3O4; γ-MnO2; toluene; catalytic combustion
Shichang TANG , Gao CHENG , Qi LIU , Fan YE , Ming SUN , Lin YU . Controllable preparation of γ-MnO2 by precursor conversion method and its catalytic combustion performance of toluene[J]. Inorganic Chemicals Industry, 2022 , 54(6) : 134 -141 . DOI: 10.19964/j.issn.1006-4990.2021-0696
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