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Effect of CeO_(2) on carbon deposition resistance of Ni/CeO_(2) catalyst supported on SiC porous ceramic for ethanol steam reforming

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Journal of Rare Earths 2023年第11期41卷 1703-1713,I0002页

作者： Tingting Bao Hui zhou Yi Zhang Chenxu Guo Wenming Guo Hang Qin pengzhao gao Hanning Xiao Weixiong Liu College of Materials Science and Engineering Hunan UniversityChangsha410082China School of Chemical Engineering Sichuan UniversityChengdu610065China

Ni/CeO_(2) catalysts(nCeO_(2):n_(Ni)=0,1,4,7,10)supported on SiC porous ce ramics for ethanol steam reforming(ESR)were investigated with respect to hydrogen production performance and growth of carbon *** oxygen released from CeO_(2) enables the oxidation of CH_(x) species to serve as carbon precursors,thus providing Ni/CeO_(2) catalysts with stronger resistance to carbon deposition compared with Ni *** Ni/CeO_(2) catalysts prepared by inverse microemulsion and impregnation methods exhibit regular semicircular spherical shape on SiC porous *** 500℃for 25 h of ESR reaction,the ethanol conversion rate over Ni/CeO_(2) catalysts(n_(CeO_(2)):n_(Ni)=7)is sustained up to 100%and H_(2) selectivity is essentially kept at 74%.The by-product selectivity declines stepwise with increasing content of CeO_(2),which is attributed to the adsorption and oxidation of CO and of CH_(x) species as CH_4 precursor from CeO_(2).The scanning electron microscopy(SEM)and transform electron microscopy(TEM)results reveal that further loading of CeO_(2) on the surface of Ni catalysts can alleviate both migration and sintering of Ni ***,carbon deposition on Ni/CeO_(2) catalysts preferentially outgrow filamentous rather than amorphous carbon,with a tendency for the latter to be more deactivated.

关键词： SiC porous Ceramic Ni/CeO_(2)catalyst Carbon deposition Ethanol steam reforming Rare earths

Efficient regeneration system applicable to five Musa cultivars

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Frontiers of Agricultural Science and Engineering 2016年第4期3卷 330-334页

作者： Juhua LIU Peiguang SUN Jing ZHANG Jiashui WANG Jianbin ZHANG Jingyi WANG Caihong JIA pengzhao gao Biyu XU Zhiqiang JIN Key Laboratory of Tropical Crop Biotechnology Ministry of Agriculture/Institute of Tropical Bioscience and BiotechnologyChinese Academy of Tropical Agricultural Sciences Haikou Experimental Station Chinese Academy of Tropical Agricultural Sciences

Banana(Musa spp.) is an important staple food, economic crop, and nutritional fruit *** is seriously hampered by the long generation time, polyploidy, and sterility of most *** of an efficient regeneration and transformation system for banana is critical for their genetic improvement. An efficient and reproducible transformation system for banana using direct organogenesis was developed. Media containing benzylaminopurine(BA)combined with one of four other growth regulators was evaluated for the regeneration efficiency of five Musa cultivars and the ability to induce/support development of new banana shoots. The result indicated that the greatest number of shoots per explant for all five Musa cultivars was obtained using MS medium supplemented with8.9 mmol$L–1BA and 9.1 mmol$L–1thidiazuron(TDZ).In 240–270 d, one immature male flower could regenerate between 380 and 456, 310–372, 200–240, 130–156, and100–130 well-developed shoots for Gongjiao, Red banana, Rose banana, Baxi, and Xinglongnaijiao, respectively. Such a system will facilitate molecular breeding and functional genomics of banana.

关键词： banana(Musa spp) system regeneration

Characteristics and source apportionment of ambient volatile organic compounds and ozone generation sensitivity in urban Jiaozuo,China

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Journal of Environmental Sciences 2024年第4期138卷 607-625页

作者： pengzhao Li Chun Chen Dan Liu Jie Lian Wei Li Chuanyi Fan Liangyu Yan Yue gao Miao Wang Hang Liu Xiaole Pan Jing Mao State Centre for International Cooperation on Designer Low-Carbon and Environmental Materials School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Henan Key Laboratory of Environmental Monitoring Technology Henan Ecological Environment Monitoring and Safety CenterZhengzhou 450046China Jiaozuo Ecological Environment Monitoring Center of Henan Province Jiaozuo 454003China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

In recent years,many cities have taken measures to reduce volatile organic compounds(VOCs),an important precursor of ozone(O_(3)),to alleviate O_(3) pollution in China.116 VOC species were measured by online and offline methods in the urban area of Jiaozuo from May to October in 2021 to analyze the compositional *** sources were analyzed by a positive matrix factorization(PMF)model,and the sensitivity of ozone generation was determined by ozone isopleth plotting research(OZIPR)*** results showed that the average volume concentration of total VOCs was 30.54 ppbv and showed a bimodal feature due to the rush-hour traffic in the morning and at *** most dominant VOC groups were oxygenated VOCs(OVOCs,29.3%)and alkanes(26.7%),and the most abundant VOC species were acetone and ***,based on the maximum incremental reactivity(MIR)method,the major VOC groups in terms of ozone formation potential(OFP)contribution were OVOCs(68.09μg/m^(3),31.5%),aromatics(62.90μg/m^(3),29.1%)and alkene/alkynes(54.90μg/m^(3),25.4%).This indicates that the control of OVOCs,aromatics and alkene/alkynes should take *** sources of VOCs were quantified by PMF,including fixed sources of fossil fuel combustion(27.8%),industrial processes(25.9%),vehicle exhaust(19.7%),natural and secondary formation(13.9%)and solvent usage(12.7%).The empirical kinetic modeling approach(EKMA)curve obtained by OZIPR on O_(3) exceedance days indicated that the O_(3) sensitivity varied in different *** results provide theoretical support for O_(3) pollution prevention and control in Jiaozuo.

关键词： Volatile organic compounds(VOCs) Online and offline measurement Ozone formation potential(OFP) Positive matrix factorization(PMF) Ozone isopleth plotting research(OZIPR) Jiaozuo

稀土离子掺杂调控MIL-101的电子结构促进电催化氮还原反应

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粉末冶金材料科学与工程 2024年第3期29卷 231-245页

作者：杨童卉岳嵩公伟伟王仁卿胡伟达刘小磐高朋召覃航郭文明肖汉宁湖南大学材料科学与工程学院长沙410082 湖南长远锂科股份有限公司长沙410205 湖南工业大学醴陵陶瓷学院株洲412200 湖南阳东电瓷电气股份有限公司株洲412205

电催化氮还原反应(electrocatalytic nitrogen reduction reaction,eNRR)被认为是在环境条件下生产低浓度NH_(3)/NH_(4)^(+)的有效策略,而设计合适的催化剂是高效驱动eNRR的关键。本研究采用水热法制备MIL-101催化剂,研究水热温度和Gd... 详细信息

电催化氮还原反应(electrocatalytic nitrogen reduction reaction,eNRR)被认为是在环境条件下生产低浓度NH_(3)/NH_(4)^(+)的有效策略,而设计合适的催化剂是高效驱动eNRR的关键。本研究采用水热法制备MIL-101催化剂,研究水热温度和Gd元素掺杂对MIL-101催化剂e NRR性能的影响。结果表明:150-MIL-101具有最高的结晶度及e NRR性能(氨产率为11.5μg/(h·mg),法拉第效率为30.5%)。MIL-101-0.5Gd表面下凹,暴露了内部粗糙孔结构,催化剂表观活性提高,同时氧空位浓度的增加可优化催化剂的特性活性,其在0.1mol/L LiClO_(4)电解质、-1.3 V电位下的氨产率和法拉第效率分别为16.7μg/(h·mg)和37.6%,优于无掺杂150-MIL-101,且催化剂具有较好的长期稳定性。

关键词：稀土离子缺陷工程电催化氮还原形貌控制电子转移促进

原位反应法制备的碳化硅涂层/三维编织碳纤维的氧化性能研究

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稀有金属材料与工程 2006年第4期35卷 533-537页

作者：高朋召王红洁金志浩西安交通大学材料强度国家重点实验室陕西西安710049

采用原位反应法在三维编织碳纤维(原纤维)表面制得β-SiC涂层,通过XRD,SEM,等温氧化失重和非等温热重分析等测试手段研究了制备方法对涂层性能的影响。结果表明:利用此法可得到均匀、完整,界面结合良好的涂层,涂层厚度增加,涂层/三维编... 详细信息

采用原位反应法在三维编织碳纤维(原纤维)表面制得β-SiC涂层,通过XRD,SEM,等温氧化失重和非等温热重分析等测试手段研究了制备方法对涂层性能的影响。结果表明:利用此法可得到均匀、完整,界面结合良好的涂层,涂层厚度增加,涂层/三维编织碳纤维(复合纤维)抗氧化性能增强。并对复合纤维氧化反应的机理进行了研究。

关键词：三维编织碳纤维原位反应法 SiC涂层氧化机理自催化反应

SiC涂层工艺对三维碳纤维编织物抗氧化性的影响

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稀有金属材料与工程 2008年第A1期37卷 78-81页

作者：陈钢军肖汉宁高朋召湖南大学材料学院湖南长沙410082

采用先驱体浸渍裂解(PIP)法在碳纤维表面制备SiC涂层。研究了涂层制备工艺对编织体抗氧化性能的影响。结果表明,经质量分数为10%的聚碳硅烷(PCS)溶液循环浸渍裂解所得样品的抗氧化性能最佳。对SiC/碳纤维非等温条件下氧化反应的动力学... 详细信息

采用先驱体浸渍裂解(PIP)法在碳纤维表面制备SiC涂层。研究了涂层制备工艺对编织体抗氧化性能的影响。结果表明,经质量分数为10%的聚碳硅烷(PCS)溶液循环浸渍裂解所得样品的抗氧化性能最佳。对SiC/碳纤维非等温条件下氧化反应的动力学研究结果表明,SiC涂层/碳纤维的非等温氧化过程呈现自催化特征。氧化机理为随机成核,动力学参数为1gA=15.223 min^(-1),E_a=157.15 kJ·mol^(-1)。

关键词： SiC涂层抗氧化性非等温氧化动力学

多孔生物形态碳/铂颗粒复合材料的电化学行为

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稀有金属材料与工程 2009年第4期38卷 734-737页

作者：李满刘艳丽高朋召陈文付泽香湖南大学湖南长沙410082

利用热解法制备了具有一定生物形态的多孔碳材料,并采用电沉积方法在所得碳材料表面沉积贵金属铂微粒。借助具有良好成膜能力的壳聚糖,把所得到的C-Pt复合材料修饰在玻碳电极表面,运用电化学方法研究了C-Pt复合材料修饰的玻碳电极对过... 详细信息

利用热解法制备了具有一定生物形态的多孔碳材料,并采用电沉积方法在所得碳材料表面沉积贵金属铂微粒。借助具有良好成膜能力的壳聚糖,把所得到的C-Pt复合材料修饰在玻碳电极表面,运用电化学方法研究了C-Pt复合材料修饰的玻碳电极对过氧化氢的电催化行为。结果发现,铂微粒和碳材料之间的协同作用大大提高了修饰电极的催化性能,对过氧化氢具有良好的电催化活性。

关键词：多孔生物形态碳电沉积铂微粒电化学行为

热负载条件对SiO_2气凝胶组成及微观结构的影响

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材料科学与工艺 2018年第5期26卷 33-39页

作者：廖进军高朋召徐凛冯坚湖南大学材料科学与工程学院长沙410082 新型陶瓷纤维与复合材料重点实验室(国防科技大学) 长沙410082

通过阶梯升温并结合傅里叶变换红外光谱(FT-IR)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)等表征手段,研究了不同温度所得SiO_2气凝胶的组成和微观结构,在程序升温条件下通过TG-DTG曲线和无模式函数法研究了Si... 详细信息

通过阶梯升温并结合傅里叶变换红外光谱(FT-IR)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)等表征手段,研究了不同温度所得SiO_2气凝胶的组成和微观结构,在程序升温条件下通过TG-DTG曲线和无模式函数法研究了SiO_2气凝胶热重行为的变化.结果表明:SiO_2气凝胶主要由7～9 nm球状颗粒构成类线形团簇,进而以团簇为骨架构成三维网络多孔结构;阶梯升温下,随着热处理温度的升高,气凝胶中Si—O—Si基团的摩尔分数逐渐增加,Si—OH和Si—OC_2H_5的摩尔分数逐渐降低,1 073 K时Si—OH基本消失,但存在6. 59%的Si—OC_2H_5基团;气凝胶颗粒逐渐长大,部分骨架坍塌,温度达到1 273 K时,颗粒长大至约50 nm,团簇彻底消失,材料发生明显烧结.程序升温下,升温速率越高,气凝胶的热稳定性越好;材料的失重过程分为3个阶段:当反应转化率α 70%时,主要是硅乙氧基(Si—OC_2H_5)之间的缩合.

关键词： SiO2气凝胶热负载条件热稳定性微观结构反应机理

Effects of Grape Balanced Nutrition Fertilizer on Yield and Quality of Wine Grapes

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Agricultural Biotechnology 2020年第4期9卷 81-86,91页

作者： Jianhua LUO Haisen YU Lin SHI Xin KE Yu WANG Jixian DONG Zhigang GUO Donglian LI pengzhao gao Huailai Noble Winery Zhangjiakou 075400China China Great Wall Wine Co. Ltd./Key Laboratory of Wine Grape ProcessingMinistry of Agriculture and Rural AreasZhangjiakou 075400China Huailai County Wine Bureau Zhangjiakou 075400China Yangtze Delta Region Institute of Tsinghua Jiaxing 314000China

In this study,the wine grapes balanced nutrient fertilizer(BNF)was designed according to the wine grape nutritional requirements in different growth stages,and objected to reduce fertilizer application rate of wine grape cultivation,improve fertilizer utilization rate,achieve stable yield and improve the quality of wine *** experiment was carried out at the Great Wall Sanggan Winery,and the Aristocratic *** experiment was designed with two treatments:Namely BNF treatment,and the traditional fertilization(CK).We investigated the effects of BNF on the quality of wine grapes by examining the plant traits of wine grapes in different experimental areas during the growing season,the fruit traits at maturity,and determined the contents of VC,organic acids,amino acids,flavonoids,soluble total sugars,soluble solids,tannins,total phenols and *** results show that:①The application of grape BNF greatly reduced the application amount of nitrogen,phosphorus and potassium,while the vine had no fertilizer deficiency phenomenon;②It increased the single fruit weight,the ear weight and yield to varying degrees,and the yield increase range was between 12% and 41%;③The wine grapes with BNF had the following characteristics:tight infructescence,even color,small fruit less,no fruit dropped,strong fruit colloid feeling,better aroma and taste;④It greatly improved the quality of wine grapes,and increased the content of soluble solids,soluble total sugar,organic acids,VC,total phenols,flavonoids,amino acids and tannins in fruits;⑤It greatly increased the total catechin content of"Riesling"and"Syrah",and had no significant effects on the catechin content of"Merlot"and"Cabernet Sauvignon".In summary,the application of grape BNF has certain practical significance for guiding the production of local wine grapes,ensuring the yield while improving the quality,increasing the income and reducing the environmental pollution caused by excessive fertilization.

关键词： Wine grapes Balanced nutrition fertilizer Quality Catechins Nitrogen and phosphorus reduction