检索结果-南通市图书馆

Effect of Mn Promoter on Structure and Performance of K-Co-Mo Catalyst for Synthesis of Higher Alcohols from CO Hydrogenation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2016年第6期29卷 671-680,I0001页

作者： Wei Xie Li-li ji ji-long Zhou Hai-bin Pan jun-fa Zhu Yi zhang Song Sun jun Bao Chen Gao NationalSynchrotronRadiationLaboratory CollaborativeInnovationCenterofChemistryforEnergyMaterialsUniversityofScienceandTechnologyofChinaHefei230029China StateKeyLaboratoryofOrganic-InorganicComposites BellingUniversityofChemicalTechnologyBeijing100029China CASKeyLaboratoryofMaterialsforEnergyConversion DepartmentofMaterialsScienceandEngineeringUniversityofScienceandTechnologyofChinaHefei230025China

A series of Mn-doped K-Co-Mo catalysts were prepared by a sol-gel method. The catalyst structure was well characterized by X-ray diffraction, N2 physisorption, NH3 temperature- programmed adsorption, in situ diffuse reflectance infrared Fourier transform spectroscopy, and X-ray absorption fine structure spectroscopy. The catalytic performance for higher alcohol synthesis from syngas was measured. It was found that the Mn-doped catalysts ex- hibited a much higher activity as compared to the unpromoted catalyst, and in particular the C2＋ alcohol selectivity increased significantly. The distribution of alcohol products de- viated from the Anderson-Schulz-Flory law. The portion of methanol in total alcohol was suppressed remarkably and the ethanol became the predominant product. Characterization results indicated that the incorporation of Mn enhanced the interaction of Co and Mo and thus led to the formation of Co-Mo-O species, which was regarded as the active site for the alcohol synthesis. Secondly, the presence of Mn reduced the amount of strong acid sites significantly and meanwhile promoted the formation of weak acid sites, which had a positive effect on the synthesis of alcohol. Furthermore, it was found that the incorporation of Mn can enhance the adsorption of linear- and bridge-type CO significantly, which contributed to the formation of alcohol and growth of carbon chain and thus increased the selectivity to C2＋OH.

关键词： CO hydrogenation Sol-gel method Mo-based catalyst Mn promoter Higheralcohols synthesis

Metal-oxoacid-mediated oxyhydroxide with proton acceptor to break adsorption energy scaling relation for efficient oxygen evolution

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第5期80卷 594-602,I0013页

作者： Rongrong zhang Beibei Guo Lun Pan Zhen-Feng Huang Chengxiang Shi Xiangwen zhang ji-jun Zou Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207FujianChina Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

Metal oxyhydroxides(MOOH)generated from irreversible reconstructions of transition metal compounds are intrinsic active species for oxygen evolution reaction,whose activities are still constrained by sluggish deprotonation kinetics and inherent adsorption energy scaling ***,we construct a tunable proton acceptor(TPA)on oxyhydroxides by in-situ reconstruction of metal oxoacids such as NiC2O4to accelerate deprotonation and break adsorption energy scaling relations during *** modified C_(2)O_(4)^(2-)as a TPA can easily extract H of*OH(forming*HC2O4intermediate)and then promote deprotonation by the transmitted hydrogen bond with*OOH along conjugated(H...)O=C-O(-H)*** a result,Ni OOH-C2O4shows non-concerted proton-electron transfer and improved deprotonation rate,and delivers a good OER activity(270 mV@10 mA cm-2).The conjugate acidity coefficient(pKa)of the modified oxoacid group can be a descriptor for TPA *** TPA strategy can be universally applied to Co-,Fe-,and Ni-based oxyhydroxides to facilitate OER efficiency.

关键词： Electrocatalysis Metal oxyhydroxide Oxoacid group Tunable proton acceptor Oxygen evolution reaction

Expressed sequence tags (ESTs) analysis of the ripening Vitis amurensis cv. Shuang Hong berry skins

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2013年第3期24卷 495-502页

作者： ji Xiang-Nan LI Feng YANG Cheng-jun LI Bo WANG jun zhang Wen Center for Viticulture and Enology College of Food Science & Nutritional Engineering China Agricultural University College of Forestry Northeast Forestry University College of Agriculture & Biotechnology China Agricultural University

Vitis amurensis is a valuable resource for wine production. Ripening of the grape berry is the key phase which determines the com- position of wine. To better understand the gene expression that manifest in V. amurensis berry skins during the ripening, cDNA library of V. amurensis berry skins was constructed. A total of 935 high quality ex- pressed sequence tags （ESTs） were obtained from the library. These ESTs represent 636 unigenes, including 108 contigs and 528 singletons. The EST analysis was performed and genes were assigned to functional categories according to their primary BLAST match. Of these 25.35% were involved with metabolism, 6.27% with cell rescue and defense, 6.84% energy, 11.68% protein synthesis, 18.8% protein activity regula- tion, 11.11% cell structure, 7.98% transport, 6.27% transcription and the remaining 5.7% were signal transduction. The generated ESTs were characterized by the gene ontology analysis and were categorized ac- cording to its cellular component, molecular function and biological process. In the cDNA library, some genes are relevant to the biosynthesis of anthocyanins, while some genes are related to grape berry maturation.

关键词： Vitis amurensis expressed sequence tags (ESTs) cDNAlibrary unigene annotation gene ontology

Integrated synthesis and ripening of AgInS_(2)QDs in droplet microreactors:An update fluorescence regulating via suitable temperature combination

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第8期33卷 3767-3771页

作者： ji Wang Hao-Tian Ma Liang-jun Pan Li zhang Zhi-Ling zhang College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China

Aqueous phase synthesized ternary I-III-VI_(2) Quantum dots(QDs)are getting more and more attention in biology researches,for their good biocompatibility and easy-to-adjust fluorescence ***,the quantum yield(QY)of these aqueous phase synthesized QDs are often pretty low,which seriously hindered their further applications in this *** general,the ripening of the QDs helps to enhance their QY,closely related to the ripening *** it is still hard to precisely control the fluorescence performance of the QDs products,due to the difficulties in precise temperature control and cumbersome temperature adjusting operations in batch *** we proposed an integrated droplet microfluidic chip for the automated and successive AgInS_(2)QDs synthesis and ripening,with both temperatures controlled independently,precisely but *** advantage of the space-time transformation of the droplet microfluidic chips,the suitable temperature combination for Ag In S_(2)QDs synthesis and ripening was studied,and the high-performance AgInS_(2)QDs were *** addition,the reason for the decrease of QY of AgInS_(2)QDs at higher ripening temperature was also explored.

关键词： AgInS_(2) Quantum dot Ripening Droplet microreactor Temperature control

Hydrogel bioadhesives harnessing nanoscale phase separation for Achilles tendon repairing

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第2期17卷 778-787页

作者： jun zhang Xingmei Chen jingseng Lin Pei zhang Iek Man Lei Yue Tao jiajun zhang Tian Luo ji Liu Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China Research and Innovation Center SKG Health TechnologyShenzhen 518000China SAFE(Shenzhen)Medical Technology Company Limited Shenzhen 518000China Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems Department of Mechanical and Energy EngineeringSouthern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities Southern University of Science and TechnologyShenzhen 518055China

Repairing Achilles tendon has emerged as a long-standing challenge in the orthopaedic *** suture is the gold standard for re-attaching and repairing the fractured Achilles tendons in clinical surgeries,it is still subjected to numerous adverse side-effects,including chronic inflammatory,tendon tissue re-rupture,scar formation,and post-surgical peritendinous *** this work,we develop a class of hydrogel bioadhesives with tailored nanoscale phase separation for Achilles tendon *** address the existing limitations of sutures,our hydrogel bioadhesives encompass three core functionalities:(i)instant and tough adhesion to Achilles tendon tissues,(ii)extraordinary long-term adhesion robustness under wet and dynamic in vivo conditions,and(iii)anti-postsurgical peritendinous *** our hydrogel bioadhesives with sutures,such kind of integrated approach enables a conformable yet robust biointerface with the tendon tissues,and prevents the fibroblast migration and formation of connective tissues,thus facilitating the tendon *** hydrogel bioadhesives reported here open up new opportunities for the repairing of fractured Achilles tendons in diverse and complicated clinical scenarios.

关键词： hydrogels phase separation bioadhesion robustness tendon repairing

Expression change of TNF-αin myocardium and hepatic tissue of rats with compound stress of hyperthermia and Hpopolysaccharide

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2013年第4期6卷 300-304页

作者： Xiao-jun zhang ji Yue Ting-Bao Zhao Department of Spinal Cord Injury General Hospital of Jinan Millitary Command

Objective:To investigate the expression characteristics of TNF-αin myocardium and hepatic tissue of rats with compound stress of hyperthermia and lipopoiysaccharide(LPS).Methods: Male SPF Wistar rats were randomly divided into room temperature+physiological saline group (Croup C),hyperthermia+physiological saline group(Croup II),room temperature+LPS group(Croup L) and hyperthermia+LPS group(Croup HL).The rats were put in simulated climate *** HL and Croup H were exposed in the environment at a dry bulb temperature(TDB) of(35.0±0.5)℃,while Croup L and Croup C were exposed in the environment at a TDB of(26.0±0.5)℃. The rats in Croup HL and Croup L were given tail intravenous injection of LPS 10 mg/kg,while the rats in Croup H and Croup C were given tail intravenous injection of 9 g/L NaCl 10 ml/kg. After the stress,immunohistochemical SABC staining method was used to detect the expression characteristics of TNF-αin myocardium and hepatic tissue of rats,and those rats were given routine pathological ***:The expression of TNF-αin myocardium and hepatic tissue in Croup HL was enhanced remarkably,and the tissue damages of Croup HL were ***:The eardiotoxieity and hepatotoxicity caused by compound stress of hyperthermia and LPS is closely related to the expression of TNF-α.

关键词： Hyperthermia Lipopolysaccharide Systemic inflammatory response Syndrome Immunohistochemistry TNF-α

Numerical study of AE and DRA methods in sandstone and granite in orthogonal loading directions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Water Science and Engineering 2012年第1期5卷 93-104页

作者： Xu-hua REN Hai-jun WANG ji-xun zhang College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210098China

The directional dependency of the acoustic emission （AE） and deformation rate analysis （DRA） methods was analyzed, based on the contact bond model in the two-dimensional particle flow code （PFC2D） in two types of rocks, the coarse-grained sandstone and Aue granite. Each type of rocks had two shapes, the Brazilian disk and a square shape. The mechanical behaviors of the numerical model had already been verified to be in agreement with those of the physical specimens in previous research. Three loading protocols with different loading cycles in two orthogonal directions were specially designed in the numerical tests. The results show that no memory effect is observed in the second loading in the orthogonal direction. However, both the cumulative crack number of the second loading and the differential strain value at the inflection point are influenced by the first loading in the orthogonal direction.

关键词： Kaiser effect deformation rate analysis PFC2D orthogonal loading directions in situ stress measurement

Cobalt（Ⅱ）-Catalyzed Bis-isocyanides Insertion Reactions with Boric Acidsand Sulfonyl Azides via Nitrene Radical Coupling

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2018年第11期36卷 1011-1016页

作者： Zheng-Yang Gu Rong zhang Shun-Yi Wang Shun-jun ji Key Laboratory of Organic Synthesis of jiangsu Province College of Chemistry Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou Jiangsu 215123 China

A Co(II)‐catalyzed effective synthesis of amidinium imine derivatives from the reaction of isocyanides and boric acids using organic azides as nitrene source has been developed. This protocol provides a new, environment‐friendly and simple strategy to construct amidinium imine derivatives with a range of substrates without any oxidants and additives.

关键词： Co(II)‐catalysis isocyanide boric acids azides nitrene radical C1 building blocks

A practical synthesis of (-)fosfomycin from its enantiomer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第11期19卷 1297-1300页

作者： Meng zhang Zheng Yu ji jun Li Da Li Yin Beijing Collab Pharma Co. Ltd. Beijing 102600 China Institute of Materia Medica Peking Union Medical College Beijing 100050 China

（＋）-cis-（1S, 2R）-Epoxypropylphosphonic acid, the enantiomer of fosfomycin, which is the industrial side-product in the preparation of the antibiotic fosfomycin, was converted into （-）fosfomycin by a seven-step procedure. The esterification of the dihydroxyphosphonic intermediate was the key step. The title compound was obtained in good yield and its optical purity was up to the medicine quality standard of Chinese Pharmacopoeia.

关键词： Fosfomycin Enantiomer Phosphonate