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Hydrogen production by glycerol reforming in supercritical water over Ni/MgO-ZrO_2 catalyst

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Journal of Energy Chemistry 2013年第4期22卷 665-670页

作者： qihai liu Liewen Liao Zili liu Xinfa Dong School of Chemistry and Chemical Engineering Zhongkai University of Agriculture and Engineering School of Chemistry and Chemical Engineering Guangzhou University School of Chemistry and Chemical Engineering South China University of Technology

Nano ZrO2 and MgO-ZrO2 were prepared by a self-assembly route and were employed as the support for Ni catalysts used in hydrogen production from glycerol reforming in supercritical water （SCW）. The reforming experiments were conducted in a tubular fixed-bed flow reactor over a temperature range of 600-800 ℃. The influences of process variables such as temperature, contact time, and water to glycerol ratio on hydrogen yield were investigated and the catalysts were charactered by ICP, BET, XRD and SEM. The results showed that high hydrogen yield was obtained from glycerol by reforming in supercritical water over the Ni/MgO-ZrO2 catalysts in a short contact time. The MgO in the catalyst showed significant promotion effect for hydrogen production likely due to the formation of the alkaline active site. Even when the glycerol feed concentration was up to 45 wt%, glycerol was completely gasified and transfered to the gas products containing hydrogen, carbon dioxide, and methane along with small amounts of carbon monoxide. At a diluted feed concentration of 5 wt%, near theoretical yield of 7 mole of H2/mol of glycerol could be obtained.

关键词： hydrogen production glycerol remforming supercritical water MgO modification Ni/ZrO2 catalysts

Removal of CO from reformed fuels by selective methanation over Ni-B-Zr-O_δ catalysts

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Journal of Natural Gas Chemistry 2009年第2期18卷 173-178页

作者： qihai liu Xinfa Dong Yibing Song Weiming Lin School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 Guangdong China College of Science Shantou University Shantou 515063 Guangdong China

The Ni-B-Oδ and Ni-B-Zr-Oδ catalysts were prepared by the method of chemical reduction, and the deep removal of CO by selective methanation from the reformed fuels was performed over the as-prepared catalysts. The results showed that zirconium strongly influenced the activity and selectivity of the Ni-B-Zr-Oδ catalysts. Over the Ni-B-Oδ catalyst, the highest CO conversion obtained was only 24.32% under the experi-mental conditions studied. However, over the Ni-B-Zr-Oδ catalysts, the CO methanation conversion was higher than 90% when the temperature was increased to 220℃. Additionally, it was found that the Ni/B mole ratio also affected the performance of the Ni-B-Zr-Oδ catalysts. With the increase of the Ni/B mole ratio from 1.8 to 2.2, the CO methanation activity of the catalyst was improved. But when the Ni/B mole ratio was higher than 2.2, the performance of the catalyst for CO selective methanation decreased instead. Among all the catalysts, the Ni29B13Zr58Oδ catalyst investigated here exhibited the highest catalytic performance for the CO selective methanation, which was capable of reducing the CO outlet concentration to less than 40 ppm from the feed gases stream in the temperature range of 230-250℃, while the CO2 conversion was kept below 8% all along. Characterization of the Ni-B-Oδ and Ni-B-Zr-Oδ catalysts was provided by XRD, SEM, DSC, and XPS.

关键词： selective methanation CO removal Ni-B-Zr-Oδ catalyst reformed fuels

Selective catalytic methanation of CO in hydrogen-rich gases over Ni/ZrO_2 catalyst

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Journal of Natural Gas Chemistry 2008年第3期17卷 268-272页

作者： qihai liu Xinfa Dong Xinman Mo Weiming Lin School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 Guangdong China

Ni/ZrO2 catalysts were prepared by the incipient-wetness impregnation method and were investigated in activity and selectivity for the selective catalytic methanation of CO in hydrogen-rich gases with more than 20 vol% CO2. The result showed that Ni loadings significantly influenced the performance of Ni/ZrO2 catalyst. The 1.6 wt% Ni loading catalyst exhibited the highest catalytic activity among all the catalysts in the selective methanation of CO in hydrogen-rich gas. The outlet concentration of CO was less than 20 ppm with the hydrogen consumption below 7%, at a gas-hourly-space velocity as high as 10000 h-1 and a temperature range of 260 °C to 280 °C. The X-ray diffraction （XRD） and temperature programmed reduction （TPR） measurements showed that NiO was dispersed thoroughly on the surface of ZrO2 support if Ni loading was under 1.6 wt%. When Ni loading was increased to 3 wt% or above, the free bulk NiO species began to assemble, which was not favorable to increase the selectivity of the catalyst.

关键词： selective methanation CO removal Ni/ZrO2 catalyst hydrogen-rich gases fuel cell

Performance of Ni/Nano-ZrO_2 Catalysts for CO Preferential Methanation

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Chinese Journal of Chemical Engineering 2014年第2期22卷 131-135页

作者：刘其海董新法刘自力 School of Chemistry and Chemical Engineering ZhongKai University of Agriculture and Engineering School of Chemistry and Chemical Engineering South China University of Technology School of Chemistry and Chemical Engineering Guangzhou University

Large surface areas nano-scale zirconia was prepared by the self-assembly route and was employed as support in nickel catalysts for the CO selective methanation. The effects of Ni loading and the catalyst calcination temperature on the performance of the catalyst for CO selective methanation reaction were investigated. The cata- lysts were characterized by Brunauer-Emmett-Teller （BET）, transmission electron microscope （TEM）, X-ray dif- fraction （XRD） and temperature-programmed reduction （TPR）. The results showed that the as-synthesized Ni/nano-ZrO2 catalysts presented high activity for CO methanation due to the interaction between Ni active particle and nano zir- conia support. The selectivity for the CO methanation influenced significantly by the particle size of the active Ni species. The exorbitant calcination resulted in the conglomeration of dispersive Ni particles and led to the decrease of CO methanation selectivity. Among the catalysts studied, the 7.5% （by mass） Ni/ZrO2 catalyst calcinated at 500℃ was the most effective for the CO selective methanation. It can preferentially catalyze the CO methanation with a higher 99% conversion in the CO/CO2 competitive methanation system over the temperature range of 260-280℃, while keeping the CO2 conversion relatively low.

关键词： selective CO methanation CO removal nano zirconia Ni catalysts

Effect of ZrO_2 Crystalline Phase on the Performance of Ni-B/ZrO_2 Catalyst for the CO Selective Methanation

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Chinese Journal of Chemical Engineering 2011年第3期19卷 434-438页

作者：刘其海廖列文刘自力董新法 School of Chemistry and Chemical Engineering ZhongKai University of Agriculture and Engineering School of Chemistry and Chemical Engineering Guangzhou University School of Chemistry and Chemical Engineering South China University of Technology

Amorphous Ni-B/ZrO2 catalysts were prepared by coprecipitation-chemical reduction with KBH4 aqueous solution,and various crystalline phase ZrO2(amorphous-ZrO2,tetragonal-ZrO2 and monoclinic-ZrO2) supported Ni-B catalysts were obtained by thermal treatment in 5%H2-N2 stream at different *** effect of ZrO2 polymorphs and the treatment temperature on the catalytic performance for the CO selective methanation were investigated,and the catalysts were characterized by N2 physisorption,Powder X-ray diffraction(XRD), Temperature-Programmed Desorption(CO-TPD and H2-TPD),and Differential Scanning Calorimeter(DSC).The treatment temperature affected strongly the crystalline structure of ZrO2,and the CO methanation activity and selectivity of the Ni-B/ZrO2 catalysts were significantly influenced by the crystalline phase of *** the three forms of ZrO2 polymorphs(amorphou-ZrO2,tetragonal-ZrO2 and monoclinic-ZrO2),the amorphous-ZrO2 supported nickle catalyst showed highest CO methanation activity,attributing in large part to the largest specific surface area and the optimum CO/H2 absorption intensity of the Ni-B/amorphous-ZrO2 catalyst.

关键词： crystalline phase carbon monoxide selective methanation Ni-B/ZrO2 catalyst

非晶态合金Co-Fe-B催化剂上肉桂醛选择加氢制肉桂醇

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石油化工 2010年第4期39卷 426-430页

作者：刘其海廖列文刘自力仲恺农业工程学院化学化工学院广东广州510225 广州大学化学化工学院广东广州510006

采用共还原法制备了非晶态合金Co-Fe-B催化剂,考察了该催化剂对肉桂醛选择加氢制肉桂醇的催化性能,探讨了Fe对非晶态合金Co-B催化剂的改性机理。实验结果表明,在非晶态合金Co-B催化剂中引入Fe,没有提高催化剂的活性,但提高了肉桂醇的选... 详细信息

采用共还原法制备了非晶态合金Co-Fe-B催化剂,考察了该催化剂对肉桂醛选择加氢制肉桂醇的催化性能,探讨了Fe对非晶态合金Co-B催化剂的改性机理。实验结果表明,在非晶态合金Co-B催化剂中引入Fe,没有提高催化剂的活性,但提高了肉桂醇的选择性,从而提高了肉桂醇的收率。表征结果显示,Fe调变了非晶态合金Co-B催化剂的结构,使C=C键加氢活性的下降幅度比C=O键加氢活性的下降幅度大,从而提高了催化剂对肉桂醇的选择性。还考察了反应温度、反应压力和反应时间对肉桂醛转化率和肉桂醇选择性的影响,在反应压力3.0MPa、反应温度403K、反应时间4h的条件下,肉桂醇收率可达90.93%。

关键词：钴-铁-硼催化剂非晶态合金肉桂醛肉桂醇选择加氢

空间站太阳翼振动测量中的动态杂光快速仿真方法

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空间控制技术与应用 2023年第5期49卷 29-37页

作者：郎燕张国琪张锦江刘启海郭朝礼李林北京控制工程研究所北京100094 空间智能控制技术全国重点实验室北京100094

针对空间站柔性太阳翼振动测量相机的动态杂光快速分析需求,基于全轨道周期下日月地3种环境光源与相机光轴夹角关系、大面积柔性阵面的动态振动位移的模拟,并从点光源和面光源两类光源特性、直接入射和经太阳翼阵面一次反射后再入射两... 详细信息

针对空间站柔性太阳翼振动测量相机的动态杂光快速分析需求,基于全轨道周期下日月地3种环境光源与相机光轴夹角关系、大面积柔性阵面的动态振动位移的模拟,并从点光源和面光源两类光源特性、直接入射和经太阳翼阵面一次反射后再入射两类杂光干扰途径出发,给出了大幅降低运算量的动态杂光判别算法,提升了杂光轨迹随被测对象动态变化时的仿真效率.仿真结果表明,该算法的实时性和准确性均可满足大型柔性太阳翼振动测量相机的杂光分析需求.

关键词：空间站柔性太阳翼振动测量动态杂光快速仿真

纳米ZrO_2负载Ni催化剂催化CO选择性甲烷化

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石油化工 2008年第7期37卷 656-661页

作者：莫欣满董新法刘其海林维明华南理工大学化学与化工学院广东广州510640

利用表面活性剂辅助模板机理,结合水热法合成出纳米有序的多孔 ZrO_2载体,采用等体积浸渍法制备了 Ni/ZrO_2催化剂;采用固定床微反装置评价了 Ni/ZrO_2催化剂对富氢气体中低含量 CO 选择性甲烷化反应的催化性能;采用 X 射线衍射和程序... 详细信息

利用表面活性剂辅助模板机理,结合水热法合成出纳米有序的多孔 ZrO_2载体,采用等体积浸渍法制备了 Ni/ZrO_2催化剂;采用固定床微反装置评价了 Ni/ZrO_2催化剂对富氢气体中低含量 CO 选择性甲烷化反应的催化性能;采用 X 射线衍射和程序升温还原等方法对载体和催化剂进行了表征。实验结果表明,利用模板剂十六烷基三甲基溴化铵(CTAB)制备的 ZrO_2载体再负载质量分数4%Ni 的 Ni/ZrO_2催化剂具有优异的催化活性,可将 CO 体积分数从1.1%降至0.01%以下,且该催化剂在220～260℃内均能保持较高的活性和选择性。表征结果显示,以 CTAB 为模板剂制备的多孔性纳米 ZrO_2具备优良的载体性能,能促进活性组分 Ni 的分散,载体与活性组分 Ni 之间存在较强的相互作用,提高了催化剂的活性。

关键词：镍纳米氧化锆富氢气体一氧化碳选择性甲烷化

基于Ansys Maxwell巨磁阻隔离器结构中线圈磁场的研究

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传感器与微系统 2024年第8期43卷 64-67页

作者：吴回州李尧卢启海刘良朋宋玉哲兰州交通大学电子与信息工程学院甘肃兰州730070 甘肃省科学院传感技术研究所甘肃省传感器与传感技术重点实验室甘肃兰州730000

巨磁阻(GMR)隔离器中平面线圈的主要作用是将电信号转化为磁信号,为了确定平面线圈的具体参数,基于Ansys Maxwell/2D对GMR隔离器结构中平面线圈的磁场影响参数进行扫描分析,确定了GMR隔离器的输入电流为5.94 mA,结合现有工艺条件,确定... 详细信息

巨磁阻(GMR)隔离器中平面线圈的主要作用是将电信号转化为磁信号,为了确定平面线圈的具体参数,基于Ansys Maxwell/2D对GMR隔离器结构中平面线圈的磁场影响参数进行扫描分析,确定了GMR隔离器的输入电流为5.94 mA,结合现有工艺条件,确定了平面线圈线宽5μm,线间距2μm,厚度2μm及线圈中心间距100μm。进一步利用Maxwell/3D建立平面线圈的3D模型,对该模型进行静磁场下的磁场强度分析,平面线圈在正下方13μm厚度的SiO_(2)隔离栅处产生的磁场强度为4.18 Oe左右,满足GMR隔离器的制作要求,为GMR隔离器平面线圈的设计提供参考。

关键词：巨磁阻隔离器平面线圈 Ansys Maxwell 静磁场磁场强度