新型铈钨钛复合氧化物催化还原脱硝机理

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Abstract Influence of H₂O₂ complex modification on the NH₃-SCR Turnover Frequency (TOF) of cerium-tungsten-titanium mixed oxide catalyst prepared through the hydrothermal co-precipitation method was investigated. And the NH₃-SCR mechanism for the catalyst modified by H₂O₂ complex was also studied by Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). The results indicated that the intensity of Brønsted acid for mixed oxide was improved by H₂O₂ complex modification. Its low-temperature NH₃ adsorption ability and low-medium temperature NH₃-SCR activity were enhanced. The TOF value of NO_x reduction at 400℃ was 0.658s^-1 for the catalyst modified by H₂O₂ complex. There existed the competitive adsorption of NH₃ and NO_x on its surface. The NH₃-SCR reaction was mainly the reaction between the adsorption of NH₃ group (NH₃, NH₂ and NH₄⁺) and the gaseous NO_x on the surface of cerium-tungsten-titanium mixed oxide catalyst modified by H₂O₂ complex, and its low-temperature NH₃-SCR mechanism obeys the Eley-Rideal mechanism.

Key words： selective catalytic reduction of NO_x with NH₃ cerium-tungsten-titanium mixed oxide H₂O₂ complex modification turnover frequency mechanism

Received: 27 September 2017

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	LIU Jing
	XIONG Zhi-bo
	ZHOU Fei
	JIN Jing
	LU Wei
	ZHANG Lei

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LIU Jing,XIONG Zhi-bo,ZHOU Fei等. The NH₃-SCR mechanism of a novel cerium-tungsten-titanium mixed oxide catalyst prepared through the hydrothermal co-precipitation method modified by H₂O₂ complex[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(5): 1670-1676.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I5/1670

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