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<p>A new robust Ce-Ga/H-ZSM-5 zeolite catalyst was developed and applied to the selective catalytic reduction of nitric oxide by methane (CH<sub>4</sub>-SCR). By accurately regulating the modified conditions including organic acid auxiliaries (citric acid, glutamic acid and salicylic acid) and pre-treating temperatures of H<sub>2</sub> and O<sub>2</sub> prior to the experiments, good-dispersion Ce-Ga/H-ZSM-5 catalyst was acquired, which showed a perfect NO conversion to N<sub>2</sub> of <i>ca.</i> 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, N<sub>2</sub>O and NO<sup>+</sup> were investigated and discussed to understand the mechanism in-depth. As a result, the CH<sub>4</sub>-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 CH<sub>4</sub>-SCR process.</p>

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

  • 期刊论文

  • 发表日期：

    2026年1月15日

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  • Jun Yang,
  • Yupeng Chang,
  • Guangjun Wu,
  • Landong Li

摘要

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.