Promotional effects of Er incorporation in CeO2(ZrO2)/TiO2 for selective catalytic reduction of NO by NH3

doi:10.1016/S1872-2067(16)62450-6

Abstract

Abstract:

A series CeO₂(ZrO₂)/TiO₂ catalysts were modified with Er using a sol-gel method. The catalytic activity of the obtained catalysts in the selective catalytic reduction(SCR) of NO with NH₃ was investigated to determine the appropriate Er dosage. The catalysts were characterized using X-ray diffraction, N₂ adsorption, NH₃ temperature-programmed desorption, H₂ temperature-programmed reduction, photoluminescence spectroscopy, electron paramagnetic resonance spectroscopy, and X-ray photoelectron spectroscopy. The results showed that the optimum Er/Ce molar ratio was 0.10; this catalyst had excellent resistance to catalyst poisoning caused by vapor and sulfur and gave more than 90% NO conversion at 220-395℃ and a gas hourly space velocity of 71 400 h^-1. Er incorporation increased the Ti³⁺ concentrations, oxygen storage capacities, and oxygen vacancy concentrations of the catalysts, resulting in excellent catalytic performance. Er incorporation also decreased the acid strength and inhibited growth of TiO₂ and CeO₂ crystal particles, which increased the catalytic activity. The results show that high oxygen vacancy concentrations and oxygen storage capacities, large amounts of Ti³⁺, and low acid strengths give excellent SCR activity.

Key words: CeO₂(ZrO₂)/TiO₂, Erbium incorporation, Selective catalytic reduction, Nitrogen oxide, Catalytic performance

Qijie Jin, Yuesong Shen, Shemin Zhu, Xihong Li, Min Hu. Promotional effects of Er incorporation in CeO₂(ZrO₂)/TiO₂ for selective catalytic reduction of NO by NH₃[J]. Chinese Journal of Catalysis, 2016, 37(9): 1521-1529.

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Promotional effects of Er incorporation in CeO₂(ZrO₂)/TiO₂ for selective catalytic reduction of NO by NH₃

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