Reaction Behaviors of NO_x and Methanol Simultaneous Abatement over a Ceria-Based NH₃–SCR Catalyst at Low-Medium Temperatures

Abstract

The NH 3 −SCR process could provide cobenefits for VOCs abatement from industrial sources. Ceria-based catalysts have received considerable attention for NO x removal at low-medium temperatures. In this study, the reaction behaviors of the simultaneous control of NO x and methanol over the Sb 0.5 CeZr 2 O x catalyst were investigated. It was found that the presence of methanol reduced NO x conversion at low temperatures, while the methanol mineralization rate was promoted in the SCR reaction environment. This effect weakened as the temperature increased, and both NO x and methanol could be effectively removed (with efficiencies more than 90%) within 250−350 °C at a CH 3 OH/NO ratio of no more than 1:1. NO adsorption and oxidation were greatly suppressed by methanol, thereby inhibiting the SCR reaction via the Langmuir−Hinshelwood (L-H) mechanism. Meanwhile, the formation of formamide via NH 3 and intermediates of methanol oxidation was also responsible for the deactivation effect on the SCR reaction at low temperatures. The presence of NO was found to be the main reason for enhanced methanol deep oxidation as NO can promote the rehealing process of active oxygen species.

Constructing Efficient CuAg Nanoalloys on Ce0.90In0.10Oδ for Methanol Deep Oxidation Catalysis at Low Temperature

“…The results show that the methanol oxidation activity of the alloy catalysts in this manuscript is higher than most of the catalysts reported in the literature. [39][40][41][42][43]…”