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国家高技术研究发展计划(2006AA06Z347)

作品数:17 被引量:74H指数:5
相关作者:陈耀强龚茂初何洪戴洪兴訾学红更多>>
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发文基金:国家高技术研究发展计划国家自然科学基金国家教育部博士点基金更多>>
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17 条 记 录,以下是 1-10
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Effects of ceria/zirconia ratio on properties of mixed CeO_2-ZrO_2-Al_2O_3 compound被引量:4
2010年
A series of CexZr0.50-xAl0.50O1.75(0.05≤x≤0.45) mixed oxides with different Ce/Zr ratio were prepared by co-precipitation method and characterized by means of X-ray diffraction(XRD),Brunauer-Emmet Teller method(BET),temperature-programmed reduction(H2-TPR) and oxygen pulsing technique.The XRD results showed that all samples kept the single CeO2 cubic fluorite structure after calcination at 600 and 1000 oC for 5 h.The results of BET revealed that CexZr0.50-xAl0.50O1.75 with Ce/Zr molar ratio 1/1 exhibited hi...
李红梅祝清超李移乐龚茂初陈永东王健礼陈耀强
关键词:CO-PRECIPITATION
Influence of CeO_2 and La_2O_3 on properties of palladium catalysts used for emission control of natural gas vehicles被引量:7
2009年
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.
Yile Li Xiaoyu Zhang Enyan Long Hongmei Li Dongdong Wu Li Cai Maochu Gong Yaoqiang Chen
关键词:XPSNO-TPD
不同铝基催化材料对单Pt三效催化剂催化性能影响
对于汽车尾气净化三效催化剂,催化载体经过多年的发展,现已进入CeO-ZrO-Ai(CZA)时期,此材料同时兼具CeO-ZrO储氧材料的储放氧能力以及AlO的高比表面和高温稳定性[1,2]。本实验室在此方面做了大量工作,开...
蔡黎赵明龚茂初陈耀强
关键词:三效催化剂
MnO_x/Ce_(0.5+x)Zr_(0.4–x)La_(0.1)O_(1.95)-Al_2O_3 catalysts used for benzene catalytic combustion
2011年
Complete oxidation of benzene over supported manganese oxides catalysts was studied.Composite supports Ce0.5+xZr0.4–xLa0.1O1.95-Al2O3 (x=0,0.1,0.2,0.3,0.4),and CeO2-Al2O3 were prepared by co-precipitation method,and manganese oxides (MnOx) catalysts were prepared by incipient wetness method.Catalytic activity was performed in a conventional fixed bed flow reactor.Among these catalysts,MnOx supported on Ce0.8Zr0.1La0.1O1.95-Al2O3 was found to have the highest catalytic activity for benzene oxidation.The complete conversion temperature of benzene on MnOx/Ce0.8Zr0.1La0.1O1.95-Al2O3 was 328 oC.The catalysts were characterized by X-ray diffraction (XRD),Brunauer-Emmett-Teller (BET) specific surface area,X-ray photoelectron spectra (XPS) and H2-temperature programmed reduction (H2-TPR).The results of BET and XRD measurements indicated that the addition of ZrO2 improved the textural properties.XPS measurements showed that MnOx was composed of MnO2 and Mn2O3.The catalysts reported in this work have significant potential in industrial application for their high performance and low cost.
廖传文李小双王健礼陈永东曹红岩陈耀强龚茂初
关键词:BENZENEMNOXLA2O3
氧化铈和铈锆固溶体对Pd催化剂抗硫性能影响的研究被引量:10
2007年
采用等体积浸渍法制备了质量分数为1%Pd/γ-Al2O3、1%Pd/10%CeO2/γ-Al2O3以及1%Pd/10%Ce0.6Zr0.4O2/γ-Al2O3催化剂,研究了CeO2和Ce0.6Zr0.4O2固溶体对Pd催化剂抗硫性能的影响。利用XRD和XPS技术表征了催化剂的固相结构、表面元素组成和反应后催化剂中硫物种(或表面硫酸盐)的存在形态。利用SO2-TPD研究了SO2在催化剂上的吸附和脱附行为。实验结果表明,在催化剂载体中引入CeO2和Ce0.6Zr0.4O2降低了催化剂起燃活性;SO2在Pd/Ce0.6Zr0.4O2/γ-Al2O3催化剂表面上发生化学反应生成Zr(SO4)2,其热稳定性大于在Pd/γ-Al2O3和Pd/CeO2/γ-Al2O3催化剂表面上的硫酸盐或硫酸盐物种。
薛彬何洪戴洪兴訾学红王亮王振阳
关键词:PD催化剂甲烷催化燃烧硫中毒
氨法选择性催化还原脱硝催化剂的研究被引量:3
2009年
采用浸渍法,以TiO_2为载体,负载P_2O_5、V_2O_5和MoO_3或WO_3制备选择性催化还原(SCR)催化剂,研究了不同磷含量以及水蒸汽对催化剂性能的影响。结果表明,随着催化剂中磷含量增加,P_2O_5-V_2O_5-MoO_3/TiO_2催化剂的SCR活性呈先上升后下降的趋势,其中,含质量分数0.5%P_2O_5催化剂的活性较好。反应体系中水蒸汽的存在对催化剂的低温活性有明显的抑制作用。
翟赟邱文革何洪
关键词:催化化学P2O5选择性催化还原氮氧化物
新型储氧、储氮材料——Ba掺杂的CeO_2-ZrO_2固溶体
2009年
利用"超声膜扩散法"制备了系列Ba掺杂的CeO_2-ZrO_2固溶体,研究了Ba掺杂对CeO_2-ZrO_2固溶体的热稳定性和储放氧能力的影响,并测量了Ba掺杂CeO_2-ZrO_2固溶体材料的储存NOx性能。结果表明,随着Ba含量的增加,固溶体的储氧量先增加后降低,在Ce_(0.5)Zr_(0.5)O_2·xBaO系列固溶体中,当x=0.16时,样品储氧量达到最大,新鲜样品的储氧量可达到745 μmol·g^(-1),样品的NO储量随含Ba量的增加而线性增加。
杨柳訾学红戴洪兴何洪
关键词:催化剂工程储氧材料
Preparation and investigation of Ce_(0.4)Zr_(0.5–x)Y_(0.1)Mn_xO_2 oxygen-storage materials
2010年
A series of Ce0.4Zr0.5-xY0.1MnxO2(0
赵明姚艳玲王海容刘志敏龚茂初陈耀强
关键词:MANGANESETEXTURE
Rh0.5Au0.5/γ-Al2O3纳米催化剂对C3H6为还原剂的NO-SCR反应活性的研究
<正>汽车贫燃发动机的应用提高了燃料的利用率,可以降低汽车尾气中CO和HC等有害物质的排放,但是过量氧气给NOx排放净化造成困难。因此,贫燃烧条件下NOx脱除己成为一个迫切需要解决的问题。目前使用的三效催化剂主要是以贵金...
关晓李志美刘立成訾学红戴洪兴何洪
关键词:纳米催化剂NO-SCR
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不同碱土金属搀杂对Pt-Rh/CeZrM/La-Al2O3三效催化剂性能的影响
采用共沉淀法制备了不同碱土金属掺杂的CeZrMO(M=Mg,Ca,Sr,Ba)固溶体。将所制备的CeZrM和La-AlO材料用于低贵金属Pt-Rh型三效催化剂的制备,并对催化剂进行了活性评价。催化活性测试结果表明,所有新...
吴冬冬郭家秀李移乐龚茂初陈耀强
关键词:三效催化剂碱土金属储氧材料
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