检索结果-南通市图书馆

Journal of Energy Chemistry 2023年第7期82卷 638-652,I0013页

作者： Mingren Jin Seyed Mohsen Sadeghzadeh jinzhu chen College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and ApplicationsJinan UniversityGuangzhou 511443GuangdongChina New Materials Technology and Processing Research Center Department of ChemistryNeyshabur BranchIslamic Azad UniversityNeyshaburIran

Visible light-driven valorization of biomass has recently been a pioneering field for nitrogen-containing heterocyclics syntheses due to its sustainable features.Herein,various aromatic ring-doped g-C_(3)N_(4) nanosheets(Ar-g-C_(3)N_(4);Ar=Py,Pm,Ph)were precisely designed to modulate their intrinsic electronic and band structure,which involves pyridine(Py),pyrimidine(Pm),and benzene(Ph)-doped g-C_(3)N_(4).Photocatalysts(CoPc/Ar-g-C_(3)N_(4)) of cobalt(II)phthalocyanine(CoPc)-fabricated Ar-g-C_(3)N_(4) were then developed for oxidative cyclization of furoin with 1,2-phenylenediamines for syntheses of various biomass-derived quinoxalines under visible-light irradiation.The catalytic activity(in terms of TOFs)of serial CoPc/Ar-g-C_(3)N_(4) samples increased with their transient photocurrents with CoPc/Py-g-C_(3)N_(4) as the most active one.For CoPc/Py-g-C_(3)N_(4),CoPc species functioned as both sensitizer and catalytic sites;while,doped Py led to a narrowed bandgap energy.Mechanism research further demonstrated that O_(2) was activated to superoxide radical(·O_(2)^(-)) by photoexcited high-level-energy electron(HLEE)transfer from Py-g-C_(3)N_(4) to CoPc for the subsequent aerobic oxidation.

关键词： Biomass Functionalized carbon nitride Nitrogen-containing heterocyclics Photocatalysis Quinoxaline

Modified solid acids derived from biomass based cellulose for one-step conversion of carbohydrates into ethyl levulinate

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2016年第5期25卷 747-753页

作者： Jun Zhang jinzhu chen Key Laboratory of Renewable Energy Chinese Academy of SciencesGuangzhou Institute of Energy ConversionChinese Academy of Sciences

A series of metal salt-modified carbon catalysts had been prepared to study the selective transformation of various carbohydrates into ethyl levulinate in an ethanol medium. The specific textural and chemical characteristics of prepared carbon samples were identified by Raman, XRD, XPS, NH;-TPD, FT-IR and nitrogen physisorption. Various parameters such as ethanol/water volume ratio, Na Cl addition, reaction temperature, and catalyst dosage played a great role in ethyl levulinate production. A desirable ethyl levulinate yield of 58.0 mol% with a highest ROF（rate of ethyl levulinate formation per gram of catalyst per hour） value of 2148.3 μmol/(g;·h) was achieved at 468 K over FeCl;modified carbon catalyst with respect to fructose conversion. The recycling experiments revealed that the sulfonated carbon catalysts exhibited relatively satisfied activity and stability.

关键词： Carbon catalysts Carbohydrates Ethyl levulinate Stability

Protonated and layered transition metal oxides as solid acids for dehydration of biomass-based fructose into 5-hydroxymethylfurfural

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2017年第1期26卷 147-154页

作者： Jiawei Zhong Yuanyuan Guo jinzhu chen Key Laboratory of Renewable Energy Guangdong Key Laboratory of New and Renewable Energy Research and Development Guangzhou Institute of Energy Conversion Chinese Academy of Sciences University of Chinese Academy of Sciences

A serial of protonated and layered transition metal oxides, including layered HTaWO6, HNbMoO6 as well as HNbWO6, were synthesized by solid-state reaction and ion-exchange. The layered HTaWO6 has been systematically studied as a solid acid to realize the dehydration of fructose to 5-hydroxymethylfurfural (HMF). The transition metal oxide samples were characterized with ICP-OES, EDS, XRD, XPS, SEM, TGA, FT-IR, N-2 adsorption-desorption and NH3-TPD. The influential factors such as reaction temperature, reaction time, solvent, catalyst amount and substrate concentration were deeply investigated. The optimized fructose conversion rate of 99% with HMF yield of 67% were achieved after 30 min at 140 degrees C in dimethylsulfoxide. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

关键词： Biomass Dehydration 5-HYdroxymethylfurfural Layered transition metal oxide Solid acid

Synthesis and Antioxidant Activity of(E)ω-Formylcamphene-Based Thiazole Hydrazone Derivatives

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2023年第1期11卷 379-391页

作者： Jiayu Chang Qingying Ding Chong Zhong Yao Long Zhuanquan Xiao Hai Luo Yuling Yang Zongde Wang Shengliang Liao jinzhu chen Shangxing chen Ji Zhang College of Forestry Jiangxi Agricultural UniversityEast China Woody Fragrance and Flavor Engineering Research Center of National Forestry and Grassland AdministrationCamphor Engineering Research Center of NFGANanchang330045China College of Science Jiangxi Agricultural UniversityNanchang330045China College of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang330027China

(E)ω-formylcamphene was synthesized fromα-pinene,the main component of turpentine,and then reacted with thiosemicarbazide to obtain(E)ω-formylcamphene thiosemicarbazide 3,which was reacted with 14α-bromoace-tophenone compounds to obtain 14(E)ω-formylcamphene thiazole hydrazone compounds 5a–5n;the yields were all above 80%.The structures of the target compounds were characterized by IR,^(1)H-NMR,^(13)C-NMR,and HR-MS analyses.Then,500,250,125,62.5,and 31.25 mg/L drug solutions were prepared.Free radical scavenging experi-ments of 1,1-diphenyl-2-picrylhydrazyl(DPPH)and 2,2-bis(3-ethyl-benzothiazole-6-sulfonic acid)diammonium salt(ABTS)were carried out with Trolox and L-ascorbic acid as the control samples.The scavenging rates of 14 compounds for DPPH and ABTS free radicals were obtained;the IC_(50) values of scavenging free radicals were fitted using SPSS software.The results show that 14(E)ω-formylcamphene-based thiazole hydrazone compounds exhibited good scavenging effects on the two free radicals,especially when the concentration of the drug solution was 125 and 62.5 mg/L;most compounds exceeded the scavenging efficiency of Trolox and L-ascorbic acid.

关键词： (E)ω-formylcamphene thiosemicarbazone thiazohydrazone structural analysis antioxidant activity

Applications of lignin-derived catalysts for green synthesis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Green Energy & Environment 2019年第3期4卷 210-244页

作者： Yuting Zhu Zhijing Li jinzhu chen Key Laboratory of Renewable Energy Guangzhou Institute of Energy ConversionChinese Academy of SciencesNo.2 Nengyuan RoadWushanTianhe DistrictGuangzhou 510640GuangdongChina Guangdong Engineering and Technology Research Centre of Graphene-Based Materials and Products Department of ChemistryCollege of Chemistry and Materials ScienceJinan UniversityNo.601 Huangpu Avenue WestTianhe DistrictGuangzhou 510632GuangdongChina University of Chinese Academy of Sciences No.19 Yuquan RoadShijingshan DistrictBeijing 100049China Key Laboratory of Biomass Chemical Engineering of Ministry of Education Department of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027ZhejiangChina

This review intends to introduce the application of lignin-derived catalyst for green organic synthesis over latest two decades and aims to present a renewable alternative for conventional catalyst for future industry application. The structure of lignin is initially introduced in this review. Then, various pretreatment and activation technologies of lignin are systematically presented, which includes physical activation for the formation of well-developed porosity and chemical activation to introduce catalytic active sites. Finally, the catalytic performances of various lignin-derived catalysts are rationally assessed and compared with conventional catalysts, which involves lignin-derived solid acids for hydrolysis, hydration, dehydration(trans)esterification, multi-component reaction and condensation, lignin-derived solid base for Knoevenagel reaction, lignin-derived electro-catalysts for electro-oxidation, oxygen reduction reaction, and lignin-derived supported transition metal catalysts for hydrogenation, oxidation, coupling reaction, tandem reaction, condensation reaction, ring-opening reaction, Friedel-Crafts-type reaction,Fischer–Tropsch synthesis, click reaction, Glaser reaction, cycloaddition and(trans)esterification. The above lignin-derived catalysts thus successfully promote the transformations of organic compounds, carbon dioxide, biomass-based cellulose, saccharide and vegetable oil into valuable chemicals and fuels. At the end of this review, some perspectives are given on the current issues and tendency on the lignin-derived catalysts for green chemistry.

关键词： Catalyst Green chemistry Lignin Pretreatment Synthesis

Selective hydrogenation of biomass-derived 5-hydroxymethylfurfural using palladium catalyst supported on mesoporous graphitic carbon nitride

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2018年第1期27卷 283-289页

作者： Jiayi chen Yao Ge Yuanyuan Guo jinzhu chen Guangzhou Institute of Energy Conversion Chinese Academy of Sciences College of Chemistry and Chemical Engineering Xinjiang University College of Chemistry and Materials Science Jinan University

Selective hydrogenation of biomass-derived 5-hydroxymethylfurfural（HMF） to 2,5-dihydroxymethyltetrahydrofuran（DHMTHF） with 96% selectivity and a complete HMF conversion is obtained over palladium catalyst supported on mesoporous graphitic carbon nitride（Pd/mpg-C_3N_4） under pressured hydrogen atmosphere in aqueous media. The excellent catalytic performance of Pd/mpg-C_3N_4 is attributed to hydrogen bonding-related competitive interactions between reactant HMF and “intermediate” 2,5-dihydroxymethylfuran（DHMF） with the support mpg-C_3N_4, which leads to a deep hydrogenation of DHMF to DHMTHF.

关键词： Biomass Carbon nitride 5-Hydroxymethylfurfural Hydrogenation

Visible-light-induced hydrogenation of biomass-based aldehydes by graphitic carbon nitride supported metal catalysts

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2021年第5期6卷 715-724页

作者： Shenghong Dong Mingzhe chen Jiarui Zhang jinzhu chen Yisheng Xu State Key Laboratory of Chemical Engineering East China University of Science and Technology130 Meilong RoadShanghai200237China Department of Chemistry College of Chemistry and Materials ScienceJinan UniversityNo.855 East Xingye AvenuePanyu DistrictGuangzhou511443China Key Laboratory of Biomass Chemical Engineering of Ministry of Education Department of Chemical and Biological EngineeringZhejiang University38 Zheda RoadHangzhou310027China

The plasmonic photocatalyst of Pd supported on graphitic carbon nitride(Pd/g-C3N4)exhibits excellent catalytic activity in photo-induced hydrogenation of biomass-based aldehydes with environmental benign reagents of formic acid(HCOOH)as proton source and triethylamine(TEA)as sacrificial electron donator.The chemical and configurational properties of the Pd/g-C3N4 were systematically analyzed with XRD,TEM and XPS.Under optimized conditions,27%yield of furfuryl alcohol with the corresponding turnover frequency(TOF)around 3.72 h^(-1) were obtained from furfural and TEA-HCOOH under visible-light irradiation by using Pd/g-C3N4.Our research additionally reveals that Pd atom is the true catalytic active site for the hydrogenation and the photo-promoted reduction mainly occurs through noble metal nanoparticles(NPs)-induced effect of surface plasmon resonance(SPR).The photo-catalytic system of Pd/g-C3N4 thus demonstrates a green and effective method for the hydrogenation of biomass-based aldehydes with sustainable solar energy as a driven force.

关键词： Biomass Graphitic carbon nitride Green chemistry Hydrogenation Photocatalysis

Transformations of biomass-based levulinate ester into γ-valerolactone and pyrrolidones using carbon nanotubes-grafted N-heterocyclic carbene ruthenium complexes

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2019年第12期28卷 29-38页

作者： Qiujuan Shen Yi Zhang Yiping Zhang Shaozao Tan jinzhu chen Guangdong Engineering and Technology Research Centre of Graphene-Based Materials and Products Department of ChemistryCollege of Chemistry and Materials ScienceJinan UniversityGuangzhou 510632GuangdongChina Key Laboratory of Biomass Chemical Engineering of Ministry of Education Department of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027ZhejiangChina

As a renewable biomass-based compound with wide applications in food additives,fine chemical synthesis and fuels,γ-valerolactone(GVL)has attached much attention.While,pyrrolidones are widely used in pharmaceutical,agrochemical,material industrial and other chemical production.In this research,we demonstrated transformations of biomass-based ethyl levulinate(EL)into GVL and pyrrolidones by using heterogeneous catalysts(CNT-Ru-1)with N-heterocyclic carbene ruthenium(NHC-Ru)complex grafted on multi-walled carbon nanotube(CNT).The Ru catalyst showed high efficiency on EL hydrogenation to GVL with both EL conversion and GVL yield exceeding 99%.Moreover,the Ru catalyst readily promoted reductive amination of EL in the presence of various amines for pyrrolidone synthesis.Finally,the Ru catalyst was also applicable to hydrogenation of various carbonyl compounds for the synthesis of the corresponding alcohols with excellent catalytic performance.The research provides insight for heterogenizing the homogeneous noble metal-based catalysts with high catalytic active for biomass-based transformations.

关键词： Biomass Carbene complex Hydrogenation Ruthenium Sustainable chemistry γ-Valerolactone

集束化护理对新生儿肺动脉高压合并肺炎恢复的临床对比研究

在线全文

学校读者我要写书评

暂无评论

中国医药指南 2024年第5期22卷 140-142页

作者：陈景春陈金珠福建省漳州市第二医院院感科漳州363199

目的分析集束化护理对新生儿肺动脉高压合并肺炎恢复的临床对比研究。方法将福建省漳州市第二医院2021年10月至2023年2月期间收治的80例新生儿肺动脉高压合并肺炎的患儿纳为研究对象,采用随机数字表法分为两组,对照组40例运用常规护理,... 详细信息

目的分析集束化护理对新生儿肺动脉高压合并肺炎恢复的临床对比研究。方法将福建省漳州市第二医院2021年10月至2023年2月期间收治的80例新生儿肺动脉高压合并肺炎的患儿纳为研究对象,采用随机数字表法分为两组,对照组40例运用常规护理,观察组40例运用集束化护理,比照两组临床的症状消失时间、肺功能水平、机械通气时间以及住院时间、治疗依从性率、满意度等。结果观察组的咳嗽、气促、肺部湿啰音消失时间、血氧饱和度等指标均优于对照组(P<0.05);观察组的机械通气时间、住院时间均短于对照组(P<0.05);观察组的第一秒用力呼吸容积(FEV_(1))、呼气高峰流量(PEFR)、用力肺活量(FVC)等肺功能水平、总依从率、总满意率均高于对照组(均P<0.05)。结论将集束护理用于新生儿肺动脉高压并发肺炎,有助于患儿的康复。增强患者治疗的依从性、降低不良发应发生率、也提高了护理满意度,缩短住院时间,恢复肺功能,促进病情转归。

关键词：集束化护理新生儿肺动脉高压肺炎

在线全文

学校读者我要写书评

暂无评论

小麦病虫草害综合防控及减药增效技术示范

现代农业科技 2024年第5期 57-59,68页

作者：张玉王风良吴佳文张海波周晨陈锦珠朱凤盐城市大丰区植物保护站江苏盐城224000 江苏省植物保护植物检疫站江苏南京210009 江苏金色农业股份有限公司江苏盐城224100

通过推广小麦抗性品种、药剂拌种、适期适量播种、精选高效药剂等综合防控措施,对小麦病虫草害进行全程综合防控,研究病虫草防控效果、农药减量增效成果及小麦增产情况。结果表明:小麦病虫草全程综合防控区赤霉病、叶锈病、穗蚜、杂草... 详细信息

通过推广小麦抗性品种、药剂拌种、适期适量播种、精选高效药剂等综合防控措施,对小麦病虫草害进行全程综合防控,研究病虫草防控效果、农药减量增效成果及小麦增产情况。结果表明:小麦病虫草全程综合防控区赤霉病、叶锈病、穗蚜、杂草防效及小麦产量等均高于群众自防区,全程综合防控区农药用量减少29.13%,用药成本降低22.14%,增加的纯收益是群众自防区的2.37倍,减药增效成果显著,且全程综合防控区小麦生长好,籽粒饱满,品质良好。

关键词：小麦病虫草害综合防控减药增效安全性