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Active and stable Cu doped niMgAlO catalysts for upgrading ethanol to n-butanol

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Journal of Energy Chemistry 2022年第9期31卷 306-317,I0009页

作者： Zhinuo Wang Ming Yin Jifeng Pang Xianquan Li Yanan Xing Yang Su Shimin Liu Xiaoyan Liu Pengfei Wu Mingyuan Zheng Tao Zhang CAS Key Laboratory of Science and Technology on Applied Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China School of Materials Science and Engineering Dalian Jiaotong UniversityDalian 116028LiaoningChina Dalian national Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023LiaoningChina

Upgrading ethanol to n-butanol is an attractive way for renewable n-butanol production. Herein, Cu was selected to modify niMgAlO catalysts for improving ethanol conversion and n-butanol selectivity. Over the optimized 2%Cu-niMgAlO catalyst, ethanol conversion and n-butanol selectivity were enhanced to 30.0% and 64.2%, respectively, in 200 h time on stream at 523 K. According to physicochemical characterizations and theoretical calculations, the key role of multiple active sites in this reaction was extensively investigated. The plate-like structure of hydrotalcite was maintained over 2%Cu-niMgAlO catalysts, with an average ni particle size of ca. 5.4 nm. The presence of Cu species created Cuni alloy sites and Lewis acid-base pairs, and increased hydrogen transfer and condensation reactions, resulting in elevated ethanol conversion and n-butanol selectivity. Additionally, Cuni alloy had a strong interaction with CuniMgAl oxides, forming homogeneous boundary due to their close ionic radius and lattice matching, and afforded the long time stability in the ethanol to n-butanol reaction.

关键词： Hydrotalcite Copper Catalysis Ethanol n-butanol

One-step Synthesis of n-butanol from Ethanol Condensation over Alumina-supported Metal Catalysts

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Chinese Chemical Letters 2004年第12期15卷 1497-1500页

作者： Ke Wu YAnG Xuan Zhen JIAnG Wei Chao ZHAnGD Department of Chemistry, Zhejiang University, HangZhou 310027 Department of Chemistry Zhejiang University Hangzhou 310027 China

One-step synthesis of n-butanol from bimolecular condensation of ethanol was firstlyachieved over nickel supported gamma alumina catalyst. A mechanism of dehydration path for thegrowth of carbon chain by eliminating a hydroxy group from one ethanol molecule with a α-H ofother ethanol molecule rather than aldol condensation was verified.

关键词： Ethanol condensation n-butanol nickel supported on gamma alumina dehydration

Effect of droplet size on the jet breakup characteristics of n-butanol during impact on a heated surface

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Journal of Traffic and Transportation Engineering(English Edition) 2020年第3期7卷 320-330页

作者： Han Wu Longmin Tang Chunze Cen Chia-Fon Lee School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China Department of Mechanical Aerospace and Ciuil EngineeringUniversity of ManchesterManchester M139PLUK Department of Mechanical Science and Engineering University of Illinois at Urbana-ChampaignUrbana1L 61801USA

Jet breakup during droplet impacted on heated surface has received wide concerns due to its *** Weber number(We)is a common used dimensionless parameter to classify and analyze the phenomenon,but it is unable to summarize all detailed phenomenon variations and related ***,the effect of droplet size on jet breakup was investigated by considering its significant difference in various *** behavior of n-butanol droplets with diameter range from 1.71 mm to 2.84 mm impacts a heated surface with jet breakup was recorded by backlit *** parameters,the jet breakup time,the jet breakup length and the jet ligament diameter,were analyzed to illustrate the *** results showed that these parameters are affected by the droplet size largely at 10number for all initial size droplets while the larger initial droplet corresponds to larger *** breakup time,breakup length and jet ligament diameter increase with the initial *** time of jet breakup versus agrees well with the theory of Rayleigh instability regardless of droplet *** addition,the jet breakup phenomenon was observed to evolve into pancake bouncing with an ultrafine high-speed jet when the We was above 50.

关键词： Energy engineering Droplet impact Heated surface Droplet size Jet breakup n-butanol

Phase separation of ploy(ethylene glycol) + n-butanol mixture induced by supercritical CO_2

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Chinese Chemical Letters 2007年第6期18卷 738-740页

作者： Min Qiang Hou, Shu Guang Liang, Ji Yuan Song, Xiao Yong Li, Zhao Fu Zhang, Tao Jiang, Bu Xing Han Beijing national Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China Beijing national Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

The phase behavior of supercritical (SC) CO2 + PEG 1000 (PEG with average molecular weight of 1000 g/mol) + n-butanol system was studied. It was demonstrated that SC CO2 could induce phase separation of PEG 1000 + n-butanol system under suitable conditions. This hints that SC CO2 has potential applications in the separation of mixtures of PEG + organic compound.

关键词： PEG1000 CO2 n-butanol Phase behavior Separation

Measurements of the Heat Capacity of an Azeotropic Mixture of Water and n-butanol from 78 to 320 K

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Chinese Journal of Chemistry 2005年第10期23卷 1297-1302页

作者：南照东谭志诚邢军 Department of Chemistry Qufu Normal University Qufu Shandong 273165 China Thermochemistry Laboratory Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian Liaoning 116023 China

Molar heat capacities of n-butanol and the azeotropic mixture in the binary system [water （x=0.716） plus n-butanol （x=0.284）] were measured with an adiabatic calorimeter in a temperature range from 78 to 320 K. The functions of the heat capacity with respect to thermodynamic temperature were estabhshed for the azeotropic mixture. A glass transition was observed at （111.9±1.2） K. The phase transitions took place at （179.26±0.77） and （269.69±0.14） K corresponding to the solid-hquid phase transitions of n-butanol and water, respectively. The phase-transition enthalpy and entropy of water were calculated. A thermodynamic function of excess molar heat capacity with respect to temperature was estabhshed, which took account of physical mixing, destructions of self-association and cross-association for n-butanol and water, respectively. The thermodynamic functions and the excess thermodynamic ones of the binary systems relative to 298.15 K were derived based on the relationships of the thermodynamic functions and the function of the measured heat capacity and the calculated excess heat capacity with respect to temperature.

关键词： adiabatic calorimetry heat capacity excess heat capacity azeotropic mixture water n-butanol

A WO3-CuWO4 nanostructured heterojunction for enhanced n-butanol sensing performance

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Chinese Chemical Letters 2020年第5期31卷 1114-1118页

作者： Fanpeng Duanmu Qian Liu Shuhui Zhong Huiming Ji Key Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education) School of Materials Science and EngineeringTianjin UniversityTianjin 300350China School of Mathematics Tianjin UniversityTianjin 300350China

Herein,a WO3-CuWO4 nanostructured heteroj unction was prepared by a facile two-step hydrothermal *** is composed of a WO3 square microplate and CuWO4 ***,the gas sensing properties were investigated under optimal operating temperature(120℃).The WO3-CuWO4 heterostructure shows good sensing performance towards n-butanol,with a response value up to 9.4 to towards 30 ppm n-butanol,and the response value is about 3 times higher than that of pristine *** detection limit for n-butanol is 0.1 ppm,which indicates a potential application in lower concentration ***,the response time of Wo3-CuWO4 nanostructured hete rojunction and the pristine WO3 are 21 s and 240 s respectively,revealing that there is a faster gas sensing process in the heterostructure.A possible sensing mechanism was then proposed on the basis of experimental data and band structure *** significant enhancement of WO3-CuWO4 heterostructure could be attributed to the formation of heterojunction,which brings electronic sensitization and electron transport pathway *** work offered a kind of novel and cost-effective sensing materials,and inspired more novel devices based on nanostructured heterojunction mechanism.

关键词： Gas sensor Tungsten oxide Copper tungstate nanostructured heterojunction nanoparticle n-butanol

Characteristics of Diesel/n-butanol Blend on a Common Rail Diesel Engine with Exhaust Gas Recirculation

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Energy Engineering 2022年第3期119卷 1239-1259页

作者： Yanfei Chen Jingjing He Hao Chen Xin Su Bin Xie nanjing Vocational Institute of Transport Technology Nanjing211188China School of Automobile Chang’an UniversityXi’an710064China

20%n-butanol is blended in diesel by volume(noted as D80B20)and experiment has been carried out to study the effect on the combustion and emission characteristics based on a common rail diesel engine with exhaust gas recirculation(EGR)*** results reveal thatD80B20 has longer ignition delay,shorter combustion duration and higher maximumin-cylinder temperature than pure diesel(noted as D100).Further,the number concentration and volume concentration of ultrafine particles decrease significantly while nO_(X) emissions increase a little with the addition of *** the exhaust gas is induced into cylinder,nO_(X) emissions significantly decrease and ultrafine particles emissions *** number geometric mean diameters and volume geometricmean diameters of ultrafine particles increase withEGR *** toD100 without EGR,D80B20 with 20%EGR ratio can reduce both nO_(X) and ultrafine particles emissions at 0.14MPa BMEP and 0.56MPa BMEP.

关键词： n-butanol ultrafine particles combustion emission common rail diesel engine

Isocoreopsin: An active constituent of n-butanol extract of Butea monosperma flowers against colorectal cancer(CRC)

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Journal of Pharmaceutical Analysis 2016年第5期6卷 318-325页

作者： Boopathi Subramaniyan navaneethakrishnan Polachi Ganeshan Mathan Department of Biomedical Science School of Basic Medical Science Bharathidasan University

The herb Butea monosperma constitutes several human health beneficial components, which are mostly studied for their anticancer effects. In this study, the activity of n-butanol fractions of B. monosperma floral extract was examined on inhibiting aberrant crypt foci(ACF) formation in azoxymethane induced Wistar albino rats. The n-butanol extracts(150 mg/kg) decreased the ACF formation(per rat) by 92% and78% in short- and long-term in vivo treatments, respectively. All the compounds in the n-butanol extract were isolated and purified using column and reverse-phase high pressure liquid chromatography(HPLC).Their structures were characterized using UV–visible spectroscopy, nuclear magnetic resonance(nMR)and electrospray–ionisation mass spectrometry(ESI–MS) to determine important flavonoids, namely isocoreopsin, butrin and isobutrin. These compounds were studied for their free radical scavenging and anticancer activities. The compound isocoreopsin showed significantly greater efficacy in cell death on human colon and liver cancer cell lines(50 μg/m L in HT-29 and 100 μg/m L in Hep G2) than butrin(100 μg/m L in HT-29 and 500 μg/m L in Hep G2) and isobutrin(80 μg/m L in HT-29 and 150 μg/m L in Hep G2). These results suggest that isocoreopsin, butrin and isobutrin are the important key compounds for the chemoprevention of colon cancer and isocoreopsin can be considered as a promising novel drug.

关键词： Butea monosperma n-butanol extracts Column chromatography HPLC Isocoreopsin

Kinetic Study of Esterification of Lactic Acid with Isobutanol and n-butanol Catalyzed by Ion-exchange Resins

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Chinese Journal of Chemical Engineering 2009年第5期17卷 773-780页

作者：屈一新彭少君王水张志强王际东 Beijing Key Laboratory of Bioprocess Department of Chemical Engineering Beijing University of Chemical Technology Beijing 100029 China

The esterification reactions of lactic acid with isobutanol and n-butanol have been studied in the presence of acid ion-exchange resin Weblyst D009. The influences of catalyst loading, stirrer speed, catalyst particle size, initial reactant molar ratio and temperature on the reaction rate have been examined. Experimental kinetic data were correlated by using the pseudo-homogeneous, Langnluir-Hinshelwood and Eley-Rideal models. nonideality of the liquid phase was taken into account by using activities instead of molar fractions. The activity coefficients were calculated according to the group contribution method UnIFAC. Provided that the nonideality of the liquid is taken into account, the esterification kinetics of lactic acid with isobutanol and n-butanol catalyzed by the acid ion-exchange resin can be described using all threemodels with reasonable errors.

关键词： kinetics esterification lactic acid isobutanol n-butanol ion exchange resin