A New Robust Ce-Ga/H-ZSM-5 Catalyst for Enhanced Selective Catalytic Reduction of Nitric Oxide by Methane

Abstract

A new robust Ce-Ga/H-ZSM-5 zeolite catalyst was developed and applied to the selective catalytic reduction of nitric oxide by methane (CH₄-SCR). By accurately regulating the modified conditions including organic acid auxiliaries (citric acid, glutamic acid and salicylic acid) and pre-treating temperatures of H₂ and O₂ prior to the experiments, good-dispersion Ce-Ga/H-ZSM-5 catalyst was acquired, which showed a perfect NO conversion to N₂ of ca. 95% at 550 °C under severe conditions. Strong interaction and cooperative effect between Ce and Ga were verified by means of physical-chemical characterizations. According to the results of diffuse reflectance infrared Fourier-transform spectroscopy, the surface intermediate species, such as CO, CN/NCO, N₂O and NO⁺ were investigated and discussed to understand the mechanism in-depth. As a result, the CH₄-SCR reaction over the as-prepared Ce-Ga/H-ZSM-5 catalyst seems to be viewed as a combination of NO reduction by CO and conventional CH₄-SCR process.

Keywords

CH₄-SCR / Ce-Ga/H-ZSM-5 / Organic acid / Reductive oxidation / Reaction mechanism

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