Papers by Author: Zhi Hang Chen

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Authors: Zhi Hang Chen, Zhi Xiong Tang, Chao Ping Cen, Huan Mu Zeng, Ding Sheng Chen, Ping Fang
Abstract: In this dissertation, combinatorial chemistry was adopted, and the activities of a series of VCuMn/TiO2 catalysts prepared by impregnation method for middle-low temperature SCR of NOx were evaluated. The activity datas showed that 2V2Cu8Mn/TiO2 exhibited better activity. At 200 °C, above 70% NOx conversion were both obtained with a gas hourly space velocity of 60,000 h-1, and NOx conversion of 2V2Cu8Mn/TiO2 reached nearly 100% at 275~325 °C. The X-ray diffraction characterization showed that the CuO and Mn2O3 phases in VCuMn/TiO2 catalysts were the main active site and with better SCR activity at middle-low temperature. In addition, sulfur-resistance of VCuMn/TiO2 catalysts were investigated, NOx conversion on 2V2Cu8Mn/TiO2 was above 60% at 250 °C after feeding SO2 (600 ppm). It can be concluded that the modified VCu/TiO2 catalyst by adding manganese obtained a good de-NOx activity in a high sulfur content gas stream.
Authors: Zhi Hang Chen, Xue Hui Li, Chao Ping Cen, Xiang Gao, Le Fu Wang
Abstract: The solid state reaction method, coprecipitation method and citric acid method were employed for the preparation of Cr-Mn mixed-oxide catalysts. Experimental results showed that this catalytic system has good selective catalytic reduction (SCR) properties of NOx by ammonia in the presence of excess oxygen at low temperature (80-220°C). 97.8% conversion of NOx with 100% selectivity of N2 had been achieved on Cr-MnOx mixed oxide prepared by the citric acid method at 120°C with the space velocity of 30,000 h-1. X-ray diffraction, BET were adopted for the characterization of the active phase. The characterization results showed that a new crystal phase CrMn1.5O4 generated in mixed oxides which was the active center of the Cr-Mn catalysts.
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