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no conversion by positive streamer discharge——effects of gas compositions and reaction conditions

Frontiers of Environmental Science & Engineering 2007年第2期1卷 153-158页

作者： HE Wei ZHU Tianle LI Jing Department of Environmental Engineering Beihang UniversityBeijing 100083China

The effects of gas compositions and reaction conditions on no conversion by positive streamer discharge were experimentally investigated by using a link tooth wheel-cylinder *** results showed that no conversion increased with increasing O_(2) concentration and NH3 concen-tration,but decreased with increasing inlet NO concentration and gas flow *** addition of CO_(2) or H_(2)O to the feed gas promoted no conversion by increasing the maximum discharge voltage,and NH4NO3 was formed in the presence of NH_(3).There was a most suitable range interval between discharge tooth wheels if both no conversion and energy consumption were *** applied voltage resulted in the increase in the amount of O_(3) generated by streamer discharge.

关键词： streamer discharge no conversion process variables

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Influence of CeO_2 and La_2O_3 on properties of palladium catalysts used for emission control of natural gas vehicles

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Journal of Natural Gas Chemistry 2009年第4期18卷 415-420页

作者： Yile Li Xiaoyu Zhang Enyan Long Hongmei Li Dongdong Wu Li Cai Maochu Gong Yaoqiang Chen Key Laboratory of Green Chemistry ＆ Technology of the Ministry of Education College of Chemistry Sichuan University Chengdu 610064 Sichuan China

Pd/YZ-Al2O3 （Y and Zr modified Al2O3, and hereafter, labelled as A1） catalysts with 4 wt% additive CeO2 and/or La2O3 were prepared and characterized by X-ray photoelectron spectroscopy （XPS）, NO-temperature programmed desorption （NO-TPD）, Nz-adsorption/desorption （Branauer-Emmet-Teller BET method）, X-ray diffraction （XRD） and CO-chemisorption. Catalytic activities for CH4, CO and no conversion were tested in a gas mixture simulated the emissions from natural gas vehicles （NGVs） operated under stoichiometric conditions. The results indicated that all catalysts exhibited excellent catalytic performances for CH4 and CO oxidation and the promoting effect of CeO2 or La2O3 was significant for no conversion. XPS results showed that the electron density around Pd was increased by CeO2 and/or La2O3, the binding energy of Pd 3d decreased as the order： Pd/Al 〉 Pd/Ce/Al 〉 Pd/La/Al 〉 Pd/CeLa/Al. The electron-rich Pd showed Rh-like catalytic properties which exhibited good activity for the reduction of NO. NO-TPD results showed that the addition of CeO2 and/or La2O3 increased NO adsorption on surface, and promoted the conversion of NO.

关键词： NGVs under stoichiometric condition palladium catalyst XPS NO-TPD no conversion methane conversion

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Low-temperature selective catalytic reduction of NO with NH_(3) based on MnO_(x)-CeO_(x)/ACFN

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Frontiers of Chemical Science and Engineering 2008年第3期2卷 325-329页

作者： Boxiong SHEN Ting LIU Zhanliang SHI Jianwei SHI Tingting YANG Ning ZHAO College of Environmental Science and Engineering Nankai UniversityTianjin 300071China

MnO_(x)-CeO_(x)/ACFN were prepared by the impregnation method and used as catalyst for selective catalytic reduction of NO with NH_(3) at 80℃-150℃.The catalyst was characterized by N_(2)-BET,scanning electron microscopy(SEM)and Fourier transform infrared spectroscopy(FT-IR).The fraction of the mesopore and the oxygen functional groups on the surface of activated carbon fiber(ACF)increased after the treatment with nitric acid,which was favorable to improve the catalytic activities of MnO_(x)-CeO_(x)/*** experimental results show that the conversion of NO is nearly 100%in the range 100℃-150℃under the optimal preparation conditions of MnO_(x)-CeO_(x)/*** addition,the effects of a series of performance parameters,including initial NH3 concentration,NO concentration and O_(2) concentration,on the conversion of NO were studied.

关键词： low-temperature SCR MnO_(x)-CeO_(x)/ACFN no conversion mesopore fraction oxygen functional group

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Synthesis of MnO2–CuO–Fe2O3/CNTs catalysts: low-temperature SCR activity and formation mechanism

Synthesis of MnO2–CuO–Fe2O3/CNTs catalysts: low-temperatur...

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河南省化学会2020年学术年会

作者： Yanbing Zhang Lihua Liu Yingzan Chen Xianglong Cheng Chengjian Song Mingjie Ding Haipeng Zhao College of Materials and Chemical Engineering Henan University of Urban Construction

MnO–CuO–FeO/CNTs catalysts,as a low-dimensional material,were fabricated by a mild redox strategy and used in denitration reactions.A formation mechanism of the catalysts was *** conversions of 4%MnO–CuO–FeO/CNTs catalyst of 43.1–87.9%at 80–180°C were achieved,which was ascribed to the generation of amorphous MnO,CuO and FeO,and a high surface-oxygen (O) content.

关键词： low temperature MnO2 no conversion

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