Abstract
MnO x catalysts with 3D structure (Mn-HT) were prepared by hard-template method using KIT-6 as a template, and the catalytic performance for the selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) at low temperatures was investigated. The template KIT-6 prepared by the different hydrothermal temperatures can exert significant effect on the catalytic performance of Mn-HT catalysts. Among the Mn-HT catalyst, the catalyst prepared using the template obtained at the hydrothermal temperature of 140 °C (Mn-140) exhibited the highest catalytic performance. Characterizations showed that Mn-140 catalyst possesses high reducibility with abundant surface oxygen species and Mn 4+ species. NH 3 -TPD and in situ DRIFTS demonstrated that there are more Lewis acid sites and Brønsted acid sites on the surface of Mn-140 catalyst, both of which would promote the adsorption and activation of NH 3 , leading to the reduction of NO x efficiently to proceed mainly by the Eley-Rideal(E-R) mechanism, accompanied by the Langmuir-Hinshelwood (L-H) mechanism. • MnO x with 3D structure was fabricated by hard-template method using KIT-6 template. • MnOx using the template obtained at hydrothermal temperature of 140 °C is the most active. • High redox property and abundant acid sites contribute to the high SCR activity. • The NH 3 -SCR over MnOx proceed by the E-R reaction mechanism.
Published Version
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