3 years ago

A Highly Effective MnNdOx Catalyst for the Selective Catalytic Reduction of NOx with NH3

A Highly Effective MnNdOx Catalyst for the Selective Catalytic Reduction of NOx with NH3
Shu-ming Liu, Rui-tang Guo, Xiao Sun, Ming-yuan Li, Jian Liu, Peng Sun, Shuai-wei Liu, Wei-guo Pan
Nd was used as the modifier to improve the NH3-selective catalytic reduction (SCR) performance of MnOx catalyst used in NOx abatement. The results of the activity test indicated that MnNdOx-0.1 catalyst displayed remarkable catalytic activity and N2 selectivity in the temperature range of 50–300 °C. Characterization results proved the enhanced reducibility and the facilitated NH3 and NOx adsorption over MnNdOx-0.1 catalyst, accompanied by the existence of more Mn4+ and surface adsorbed oxygen species over its surface. The results of the in situ diffuse reflectance infrared Fourier transform study pointed out that the NH3-SCR reaction over the MnNdOx-0.1 catalyst was mainly under the control of the Langmuir–Hinshelwood mechanism (≤100 °C); when the reaction temperature was over 200 °C, the Eley–Rideal mechanism was dominant. More adsorbed NOx and NH3 species over the MnNdOx-0.1 catalyst, along with the activation effect of Nd on the adsorbed reactants, had a facilitation impact on the SCR reaction process over the MnNdOx-0.1 catalyst.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b03705

DOI: 10.1021/acs.iecr.7b03705

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