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Excellent performance of Cu-Mn/Ti-sepiolite catalysts for low-temperature CO oxidation

Frontiers of Environmental Science & Engineering 2017年第2期11卷 77-86页

作者： Yong Song Lisha Liu zhidan fu Qing Ye Shuiyuan Cheng Tianfang Kang Hongxing Dai Key Laboratory of Beijing on Regional Air Pollution Control Department of Environmental Science Beijing University of Technology Beijing 100124 China Beijing Key Laboratory for Green Catalysis and Separation Key Laboratory of Beijing on Regional Air Pollution Control Department of Chemistry and Chemical Engineering Beijing University of Technology Beijing 100124 China

The Ti-modified sepiolite （Ti-Sep）-supported Mn-Cu mixed oxide （yMn5Cu/Ti-Sep） catalysts were synthesized using the co-precipitation method. The materials were characterized by the X-ray diffraction scanning electron microscope, N2 adsorption-desorption, H2-TPR, O2-TPD, and XPS techniques, and their catalytic activities for CO oxidation were evaluated. It was found that the catalytic activities ofyMn5Cu/Ti-Sep were higher than those of 5Cu/Ti-Sep and 30Mn/Ti-Sep, and the Mn/Cu molar ratio had a distinct influence on catalytic activity of the sample. Among the yMn5Cu/Ti- Sep samples, the 30Mn5Cu/Ti-Sep catalyst showed the best activity （which also outperformed the 30Mn5Cu/Sep catalyst）, giving the highest reaction rate of 0.875 × 10^- 3 mmol· g^-1· s^-1 and the lowest T50%and T100% of 56℃ and 86℃, respectively. Moreover, the 30Mn5Cu/Ti-Sep possessed the best low-temperature reducibility, the lowest 02 desorption temperature, and the highest surface Mn3＋/ Mn4＋ atomic ratio. It is concluded that factors, such as the strong interaction between the copper or manganese oxides and the Ti-Sep support, good low-temperature reducibility, and good mobility of ehemisorbed oxygen species, were responsible for the excellent catalytic activity of 30Mn5Cu/Ti-Sep.

关键词： Ti-modified sepioliteSupported Mn-Cu mixed oxideLow-temperature reducibilityStrong metal-support interactionCO oxidation

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Enhanced catalytic performance of Cu-and/or Mn-loaded Fe-Sep catalysts for the oxidation of CO and ethyl acetate

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Chinese Journal of Chemical Engineering 2017年第10期25卷 1427-1434页

作者： Lisha Liu Yong Song zhidan fu Qing Ye Shuiyuan Cheng Tianfang Kang Hongxing Dai Key Laboratory of Beijing on Regional Air Pollution Control Department of Environmental Science Beijing University of Technology Beijing 100124 China Beijing Key Laboratory for Green Catalysis and Separation Key Laboratory of Beijing on Regional Air Pollution Control Key Laboratory of Advanced Functional Materials Education Ministry of China Laboratory of Catalysis Chemistry and Nanoscience Department of Chemistry and Chemical Engineering College of Environmental and Energy Engineering Beijing University of Technology Beijing 100124 China

The Fe-modi fied sepiolite-supported Mn–Cu mixed oxide(Cux Mny/Fe-Sep) catalysts were prepared using the co-precipitation *** materials were characterized by means of the XRD,N_2 adsorption–desorption,XPS,H_2-TPR,and O_2-TPD techniques,and their catalytic activities for CO and ethyl acetate oxidation were *** results show that catalytic activities of the Cux Mny/Fe-Sep samples were higher than those of the Cu1/Fe-Sep and Mn2/Fe-Sep samples,and the Mn/Cu molar ratio had a distinct in fluence on catalytic activity of the *** the Cux Mny/Fe-Sep and Cu1Mn2/Sep samples,Cu1Mn2/Fe-Sep performed the best for CO and ethyl acetate oxidation,showing the highest reaction rate and the lowest T50 and T90 of 4.4×10^(-6) mmol·g-1·s-1,110,and 140 °C for CO oxidation,and 1.9×10^(-6) mmol·g-1·s-1,170,and210 °C for ethyl acetate oxidation,***,the Cu1Mn2/Fe-Sep sample possessed the best lowtemperature reducibility and the lowest temperature of oxygen desorption as well as the highest surface Mn^(4+)/Mn^(3+) and Cu^(2+)/CuO atomic *** is concluded that factors,such as the strong interaction between the Cu or Mn and the Fe-Sep support,good low-temperature reducibility,and good mobility of chemisorbed oxygen species,might account for the excellent catalytic activity of Cu1Mn2/Fe-Sep.

关键词： Fe-modified sepiolite Supported Mn–Cu mixed oxide Reducibility Strong metal-support interaction CO oxidation Ethyl acetate oxidation

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Catalytic oxidation of carbon monoxide, toluene, and ethyl acetate over the xPd/OMS-2 catalysts： Effect of Pd loading

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Frontiers of Chemical Science and Engineering 2017年第2期11卷 185-196页

作者： zhidan fu Lisha Liu Yong Song Qing Ye Shuiyuan Cheng Tianfang Kang Hongxing Dai Key Laboratory of Beijing on Regional Air Pollution Control Department of Environmental Science College of Environmental and Energy Engineering Beijing University of Technology Beijing 100124 China Beijing Key Laboratory for Green Catalysis and Separation Key Laboratory of Beijing on Regional Air Pollution Control Department of Chemistry and Chemical Engineering College of Environmental and Energy Engineering Beijing University of Technology Beijing 100124 China

The Pd catalyst supported on cryptomelanetype manganese oxide octahedral molecular sieve （OMS- 2） were prepared. The effect of Pd loading on the catalytic oxidation of carbon monoxide, toluene, and ethyl acetate over xPd/OMS-2 has been investigated. The results show that the Pd loading plays an important role on the physicochemical properties of the xPd/OMS-2 catalysts which outperform the Pd-free counterpart with the 0.5Pd/ OMS-2 catalyst being the best. The temperature for 50% conversion was 25, 240 and 160 ℃, and the temperature for 90% conversion was 55,285 and 200 ℃ for oxidation of CO, toluene, and ethyl acetate, respectively. The low- temperature reducibility and high oxygen mobility ofxPd/ OMS-2 are the factors contributable to the excellent catalytic performance of 0.5Pd/OMS-2.

关键词： cryptomelane-type manganese oxide octahedral molecular sieve oxygen mobility reducibility carbon monoxide oxidation volatile organic compound combustion

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Maize-soybean relay cropping increases soybean yield synergistically by extending the post-anthesis leaf stay-green period and accelerating grain filling

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The Crop Journal 2023年第6期11卷 1921-1930页

作者： Yiling Li Ping Chen zhidan fu Kai Luo Ping Lin Chao Gao Shanshan Liu Tian Pu Taiwen Yong Wenyu Yang College of Agronomy Sichuan Agricultural University/Key Laboratory of Crop Ecophysiology and Farming System in SouthwestMinistry of Agriculture and Rural Affairs/Sichuan Engineering Research Center for Crop Strip Intercropping SystemChengdu 611130SichuanChina

Relay cropping of Poaceae and Fabaceae promotes high yield and land-use efficiency by allowing a double ***,it is difficult to increase yield synergistically because of the reduced photosynthetic abilities of legume leaves under the shade of *** photosynthetic capacity in relay cropping systems is associated with ecological niche differentiation and photosynthetic compensation after restoration of normal *** conducted a field experiment in southwest China in 2020–2021 to evaluate the effects of three cropping patterns:maize–soybean relay cropping(IMS),monoculture maize(MM),and monoculture soybean(SS),and N application levels:no N application(NN:0 kg N ha^(−1)),reduced N(RN:180 kg N ha^(−1)),and conventional N(CN:240 kg N ha^(−1)).Compared to monocropping,relay cropping increased the stay-green traits of maize and soybean by 13%and 89%,*** cropping prolonged the leaf stay-green duration in the maize and soybean lag phase by almost 4 and 8 days,*** cropping maize(IM)increased the leaf area index(LAI)by 79.4%to 88.5%under NN and 55.5%to 148%under *** cropping soybean(IS)increased the LAI from 115%to 437%at days 40 to 50 after *** increased yield by 65.6%.IS increased yield by 9.7%.HI and system yield were at their highest values under *** the relay cropping system,reduced N application extended green leaf duration,increased photosynthesis inside the canopy at multiple levels,ultimately increases soybean yield synergistically.

关键词： Leaf stay-green Nitrogen reduction Maize-soybean relay cropping Yield

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Coordinated responses of leaf and nodule traits contribute to the accumulation of N in relay intercropped soybean

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Journal of Integrative Agriculture 2024年第6期23卷 1910-1928页

作者： Ping Chen Qing Du Benchuan Zheng Huan Yang zhidan fu Kai Luo Ping Lin Yilin Li Tian Pu Taiwen Yong Wenyu Yang College of Agronomy Sichuan Agricultural University/Sichuan Engineering Research Center for Crop Strip Intercropping System/Key Laboratory of Crop Ecophysiology and Farming System in SouthwestMinistry of Agriculture and Rural AffairsChengdu 611130China Crop Research Institute Sichuan Academy of Agricultural SciencesChengdu 610066China

Maize(Zea mays L.)-soybean(Glycine max ***.)relay intercropping provides a way to enhance land ***,the late-planted soybean suffers from shading by the *** maize harvest,how the recovery growth influences the leaf and nodule traits remains unclear.A three-year field experiment was conducted to evaluate the effects of genotypes,i.e.,supernodulating(nts1007),Nandou 12(ND12),and Guixia 3(GX3),and crop configurations,i.e.,the interspecific row spacing of 45(I45),60(I60),75 cm(I75),and sole soybean(SS),on soybean recovery growth and N *** results showed that intercropping reduced the soybean total leaf area(LA)by reducing both the leaf number(LN)and unit leaflet area(LUA),and it reduced the nodule dry weight(NW)by reducing both the nodule number(NN)and nodule diameter(ND)compared with the *** correlation and principal component analysis(PCA)indicated a co-variability of the leaf and nodule traits in response to the genotype and crop configuration *** the recovery growth stages,the compensatory growth promoted soybean growth to reduce the gaps of leaf and nodule traits between intercropping and *** relative growth rates of ureide(RGR_U)and nitrogen(RGR_N)accumulation were higher in intercropping than in *** achieved more significant sucrose and starch contents compared with ***12 and GX3 showed more robust compensatory growth than nts1007 in *** the recovery growth of relay intercropping soybean improved biomass and nitrogen accumulation,ND12 gained a more significant partial land equivalent ratio(pLER)than *** I60 treatment achieved more robust compensation effects on biomass and N accumulation than the other ***,I60 showed a higher nodule sucrose content and greater shoot ureide and N accumulation than ***,intercropping ND12 with maize using an interspecific row spacing of 60 cm was optimal for both yield advantage and N accumulation.

关键词： relay intercropping genotype crop configuration symbiotic nitrogen fixation soybean nodule

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MnOx-L负载Fe催化剂的制备及其催化氧化CO性能

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北京工业大学学报 2020年第4期46卷 360-368页

作者：傅之丹付娇丽叶青程水源康天放北京工业大学区域大气复合污染防治北京市重点实验室北京100124

为了有效去除大气污染物中的CO,使用氧化还原法制备层状锰氧化物MnOx-L,并用离子交换法制备了负载不同质量分数Fe的Fex/MnOx-L催化剂.使用扫描电子显微镜(scanning electron microscope,SEM)、X射线衍射(X-ray diffraction,XRD)技术、... 详细信息

为了有效去除大气污染物中的CO,使用氧化还原法制备层状锰氧化物MnOx-L,并用离子交换法制备了负载不同质量分数Fe的Fex/MnOx-L催化剂.使用扫描电子显微镜(scanning electron microscope,SEM)、X射线衍射(X-ray diffraction,XRD)技术、比表面积测定(brunauer emmett teller,BET)、热重分析(thermogravimetric analysis,TGA)、氢气程序升温还原(hydrogen temperature-programmed reduction,H2-TPR)、氧气程序升温脱附(oxygen temperature-programmed,O2-TPD)、X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)等技术表征催化剂形貌、结构及性能.层状锰氧化物MnOx-L具有典型的八面体层状结构,Fe负载对催化剂结构影响不大,但对其理化性质产生了影响.Fe负载改变了催化剂的还原性及其表面的m(Fe^2+)/m(Fe^3+)和m(Oads)/m(Olatt)比例,提高了样品的催化活性.在所有Fex/MnOx-L样品中,Fe5/MnOx-L具有最高的低温还原性、氧移动性,m(Fe^2+)/m(Fe^3+)及表面吸附氧最高.催化氧化CO反应中,Fe5/MnOx-L具有最佳的催化活性(t 50=80℃和t 90=150℃),这与Fe和MnOx-L载体之间的相互作用有关.

关键词：层状锰氧化物 Fex/MnOx-L 催化氧化CO 负载量活性还原性

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减量施氮对玉米/大豆套作系统中作物氮素吸收及土壤氨氧化与反硝化细菌多样性的影响

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中国农业科学 2017年第6期50卷 1076-1087页

作者：周丽付智丹杜青陈平杨文钰雍太文四川农业大学农学院/农业部西南作物生理生态与耕作重点实验室/四川省作物带状复合种植工程技术研究中心

【目的】揭示玉米/大豆套作系统下作物根际土壤细菌数量及群落多样性变化特征与土壤总氮含量、作物氮素吸收之间的关系,为禾/豆间(套)作减肥增效生产提供理论和技术支撑。【方法】大田试验于2013—2015年进行,采用两因素裂区设计,主因... 详细信息

【目的】揭示玉米/大豆套作系统下作物根际土壤细菌数量及群落多样性变化特征与土壤总氮含量、作物氮素吸收之间的关系,为禾/豆间(套)作减肥增效生产提供理论和技术支撑。【方法】大田试验于2013—2015年进行,采用两因素裂区设计,主因素为种植模式,设玉米单作(MM)、大豆单作(SS)和玉米/大豆套作(IMS);副因素为玉米、大豆施氮总量,设不施氮(NN:0)、减量施氮(RN:180 kg·hm)和常量施氮(CN:240 kg·hm)。在玉米V12期、VT期和R6期,大豆V5期、R2期、R5期和R8期,利用稀释平板法和凯氏定氮法测定各作物根际土壤细菌数量、非根际土壤和植株总氮含量;结合克隆文库和荧光定量PCR技术研究各处理氨氧化细菌(amo A基因)、反硝化细菌(nir S基因)多样性及其基因丰度。【结果】与相应的单作相比,套作玉米(IM)的作物根际土壤细菌数量提高2.6%,套作大豆提高12.9%;套作玉米土壤总氮含量和植株吸氮量分别提高13.39%和2.10%,大豆的分别降低5.81%和3.24%;套作玉米、大豆的amo A基因丰度比单作增加了38.5%、64.8%,nir S基因丰度比单作提高57.77%、126.39%。各施氮水平间,RN的玉米根际土壤细菌数量比NN和CN的分别提高9.6%和9.8%,大豆的分别提高11.7%和11.0%;施氮提高了玉米、大豆植株吸氮量和土壤总氮含量,单作玉米随施氮量的增加而增加,套作玉米及单、套作大豆的均在RN下最高;减量施氮提高了玉米、大豆amoA基因多样性指数和单作玉米nir S基因多样性指数,降低了套作玉米和单套作大豆nirS基因多样性指数。【结论】减量施氮有利于增加玉米/大豆套作系统中作物根际土壤细菌数量,调节氨氧化细菌和反硝化细菌群落结构及多样性,改善土壤氮素转化过程,促进玉米、大豆对氮素的吸收,实现节肥增效。

关键词：玉米/大豆套作减量施氮细菌多样性氮素吸收

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软件工程硕士国际化培养模式的探索与实践

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中国电力教育 2010年第32期 41-42页

作者：傅之丹李娟北京工业大学研究生部

北京工业大学软件学院作为首批国家级示范性软件学院,在新型软件人才培养方面更新教育理念,突出工程应用能力培养,促进个性发展。为培养具有国际竞争力的高层次人才,在专业建设、课程设置、师资队伍、教学实践、联合培养等多方面积极构... 详细信息

北京工业大学软件学院作为首批国家级示范性软件学院,在新型软件人才培养方面更新教育理念,突出工程应用能力培养,促进个性发展。为培养具有国际竞争力的高层次人才,在专业建设、课程设置、师资队伍、教学实践、联合培养等多方面积极构建国际化的教育模式。

关键词：软件工程硕士国际化培养模式

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不同结瘤品种和行间距对套作大豆根瘤生长及物质积累与分配的影响

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浙江大学学报（农业与生命科学版） 2017年第4期43卷 451-461页

作者：庞婷帅鹏陈平杜青付智丹杨文钰雍太文四川农业大学农学院/四川省作物带状复合种植工程技术研究中心/农业部西南作物生理生态与耕作重点实验室成都611130 华中农业大学植物科学技术学院/农业部长江中游作物生理生态与耕作重点实验室武汉430070

在玉米/大豆套作模式下,采用2因素随机区组设计,研究不同玉米/大豆间距(45、60、75 cm,依次记为IS45、IS60、IS75)和不同结瘤特性的大豆品种(弱结瘤:贡选1号;强结瘤:南豆25号)对大豆根瘤生长、干物质积累和分配的影响。结果表明:从三节... 详细信息

在玉米/大豆套作模式下,采用2因素随机区组设计,研究不同玉米/大豆间距(45、60、75 cm,依次记为IS45、IS60、IS75)和不同结瘤特性的大豆品种(弱结瘤:贡选1号;强结瘤:南豆25号)对大豆根瘤生长、干物质积累和分配的影响。结果表明:从三节期到盛花期,随着玉米/大豆间距的增大,大豆受玉米的荫蔽影响减小,根瘤数目和干质量增加;在始粒期大豆的根瘤数目和干质量达到最大值,表现为IS60>IS75>IS45;相较于弱结瘤品种,强结瘤品种的根瘤数目较少,根瘤干质量较大。从三节期到盛花期,大豆干物质积累总量随玉米/大豆间距的缩小而减少,主要分配在茎秆和叶片;强结瘤品种茎秆和叶片的干物质积累量及干物质积累总量小于弱结瘤品种。从始粒期到成熟期,大豆干物质积累总量迅速增加,茎秆和叶片的分配率降低,荚果的分配率增大,强结瘤品种在成熟期玉米/大豆间距为60 cm时达到最大值。强结瘤品种各营养器官的输出率和贡献率较高,其平均产量比弱结瘤品种高2.94%,IS60处理的平均产量分别比IS45和IS75高9.77%和2.67%。相对于弱结瘤品种,强结瘤品种产量的提高主要通过提高单荚粒数和百粒质量来实现。

关键词：玉米/大豆套作行间距根瘤干物质产量

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施氮量对玉米/大豆套作系统土壤微生物数量及土壤酶活性的影响

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中国生态农业学报 2017年第10期25卷 1463-1474页

作者：付智丹周丽陈平杜青庞婷杨文钰雍太文四川农业大学农学院/四川省作物带状复合种植工程技术研究中心/农业部西南作物生理生态与耕作重点实验室成都611130 四川宜宾市农业科学院宜宾644000

为揭示玉米/大豆套作体系下土壤氮素转换的调控机理和根际微生态效应,以种植模式为主因素[设玉米单作(MM)、大豆单作(SS)和玉米/大豆套作(IMS)3种处理],以玉米、大豆施氮总量(玉米、大豆施氮比例为3∶1)为副因素[设不施氮(NN,0 kg?hm^(-... 详细信息

为揭示玉米/大豆套作体系下土壤氮素转换的调控机理和根际微生态效应,以种植模式为主因素[设玉米单作(MM)、大豆单作(SS)和玉米/大豆套作(IMS)3种处理],以玉米、大豆施氮总量(玉米、大豆施氮比例为3∶1)为副因素[设不施氮(NN,0 kg?hm^(-2))、减量施氮(RN,180 kg?hm^(-2))和常量施氮(CN,240 kg?hm^(-2))3个处理],研究了玉米/大豆套作系统下不同施氮量对作物根际土壤微生物数量及土壤酶活性的影响。结果表明:与相应单作相比,套作下玉米根际土壤真菌、放线菌数量分别提高25.37%和8.79%;套作大豆根际土壤真菌、放线菌、固氮菌数量高于单作大豆;套作玉米根际土壤蛋白酶、脲酶活性和套作大豆根际土壤蛋白酶活性均显著升高。各施氮水平间,减量施氮下玉米、大豆根际土壤真菌数量较常量施氮和不施氮均有所提高;施氮提高了玉米、大豆根际土壤放线菌数量;大豆根际土壤固氮菌数量以减量施氮最高,比不施氮和常量施氮高17.78%和5.67%;玉米根际土壤蛋白酶活性、脲酶活性和大豆根际土壤脲酶活性均以减量施氮为最高。适宜的施氮量不仅能增加玉米/大豆套作土壤中真菌、放线菌、固氮菌的数量,还能提高土壤蛋白酶、脲酶活性,调节土壤氮素的转化,促进玉米/大豆对土壤中氮素的吸收,实现节能增效。

关键词：玉米/大豆套作施氮量根际土壤真菌放线菌固氮菌土壤酶活性

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