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microwave irradiation-induced alterations in physicochemical properties and methane adsorption capability of coals:An experimental study using carbon molecular sieve

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Chinese Journal of Chemical Engineering 2024年第4期68卷 165-180页

作者： Xuexiang Fu Xing Tang Yi Xu Xintao Zhou Dengfeng Zhang Faculty of Chemical Engineering Kunming University of Science and TechnologyKunming 650500China

In order to comprehend the applicability of microwave irradiation for recovering coalbed methane,it is necessary to evaluate the microwave irradiation-induced alterations in coals with varying levels of metamorphism.In this work,the carbon molecular sieve combined with KMnO_(4)oxidation was selected to fabricate carbon molecular sieve with diverse oxidation degrees,which can serve as model substances toward coals.Afterwards,the microwave irradiation dependences of pores,functional groups,and highpressure methane adsorption characteristics of model substances were studied.The results indicated that microwave irradiation causes rearrangement of oxygen-containing functional groups,which could block the micropores with a size of 0.40-0.60 nm in carbon molecular sieve;meanwhile,naphthalene and phenanthrene generated by macro-molecular structure pyrolysis due to microwave irradiation could block the micropores with a size of 0.70-0.90 nm.These alterations in micropore structure weaken the saturated methane adsorption capacity of oxidized carbon molecular sieve by 2.91%-23.28%,suggesting that microwave irradiation could promote methane desorption.Moreover,the increased mesopores found for oxidized carbon molecular sieve after microwave irradiation could benefit CH4 diffusion.In summary,the oxidized carbon molecular sieve can act as model substances toward coals with different ranks.Additionally,microwave irradiation is a promising technology to enhance coalbed methane recovery.

关键词： microwave irradiation Physicochemical property Coal matrix Adsorption Carbon molecular sieve

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microwave irradiation Treatment of Wood Flour and Its Application in PVC-Wood Flour Composites

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Journal of Wuhan University of Technology(Materials Science) 2007年第1期22卷 148-152页

作者：胡圣飞陈文 Institute of Materials Science and Engineering Wuhan University of Technology School of Chemical and Environmental Engineering Hubei University of Technology Wuhan 430068China

The technique of microwave irradiation induced free radical bulk- polyaddition reactions in porous wood flour was used to modify wood flour. The behaviors of the modified wood flour under microwave irradiation, such as thermal stability and moisture sorption properties, were studied. A kind of semiinterpenetrating polymer network wood four （Semi-IPN-WF） can be formed through polymerization of MMA in the porous wood flour by microwave irradiation, and the thermal decomposition temperature of the semi-IPN-WF is considerably increased. PVC/Semi-IPN-WF composites were prepared by melt mixing in double rolls, which exhibit improved rheological properties, lower water sorption properties and outstanding mechanical performances.

关键词： microwave irradiation wood flour poly（vinyl chloride） composites

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microwave irradiation Promoted Synthesis of Aryloxy Acetic Acids

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Chemical Research in Chinese Universities 2004年第2期20卷 213-215页

作者： LINMin ZHOUJin-mei XIAHai-ping YANGRui-feng LINChen DepartmentofChemistry XiamenUniversity Xiamen361005 P.R.China DepartmentofMaterialSciences XiamenUniversityXiamen361005P.R.China

Several aryloxy acetic acids were synthesized under microwave irradiation. The factors, which affect the reaction, were investigated and optimized. It was revealed that the best yields(92.7%—97.4%) were obtained when the molar ratio of the reactants was n(ArOH)∶n(NaOH)∶n(ClCH 2CO 2H) =1∶2.5∶1.2 with microwave irradiation power of 640 W for 65—85 s.

关键词： microwave irradiation Aryloxy acetic acid Synthesis

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A Novel Method for One-pot Synthesis of Furo[3,2-c]coumarin Derivatives from 4-Hydroxycoumarin and Arylglyoxal under microwave irradiation

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Chinese Journal of Chemistry 2012年第8期30卷 1845-1850页

作者：陈志卫毕建豪苏为科 Key Laboratory for Green Pharmaceutical Technologies and Related Equipment of Ministry of Education College of Pharmaceutical SciencesZhejiang University of TechnologyHangzhouZhejiang 310014China

A novel one-pot synthesis of furo[3,2-c]coumarins has been developed from readily available starting materials 4-hydroxycoumarin and arylglyoxal. This method is simple, rapid and good yielding.

关键词： furocoumarins 4-hydroxycoumarin arylglyoxal microwave irradiation one-pot synthesis

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Dialdehyde in Heterocyclic Synthesis: Synthesis of Compounds Containing Two 4H-Benzopyran Building Blocks under microwave irradiation

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Chinese Journal of Chemistry 2004年第7期22卷 622-626页

作者：冯友建缪春宝高原屠树江房芳史达清 Department of Chemistry Xuzhou Normal University Key Laboratory of Biotechnology on Medical Plant Xuzhou Jiangsu 221009 China Department of Chemistry Shenzhen University Shenzhen Guangdong 518060 China

The syntheses of 4H-benzopyran derivatives were investigated using dialdehyde as a key starting material. The reaction proceeds under microwave irradiation in good yield (87%—95%) with short reaction time (5—8 min), therefore providing a rapid and efficient method of synthesizing a variety of compounds containing two 4H-benzopyran units.

关键词： H-benzopyran dialdehyde microwave irradiation

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Synergistic effect of microwave irradiation and CaF2 on vanadium leaching

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International Journal of Minerals,Metallurgy and Materials 2017年第2期24卷 156-163页

作者： Jing-peng Wang Yi-min Zhang Jing Huang Tao Liu School of Resource and Environmental Engineering Wuhan University of Science and Technology Wuhan 430081 China Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource Wuhan 430081 China Hubei Provincial Collaborative Innovation Center for High Efficient Utilization of Vanadium Resource Wuhan 430081 China

The effect and mechanism of microwave irradiation on vanadium leaching were studied via a comparison between microwave heating and conventional heating. The results show a synergistic effect of microwave irradiation and calcium fluoride （CaF2） on the vana- dium leaching efficiency. It is confirmed that the vanadium leaching process can be improved by microwave irradiation when CaF2 is present. The leaching rate of vanadium under microwave irradiation is increased by 8%-15% when 5wt% CaF2 is added; by contrast, in the absence of CaF2, the leaching rate is almost unaffected compared to that by conventional heating. Morphological analysis reveals that the particles are gradually eroded by acid under microwave irradiation, whereas some of the fine particles in samples subjected to conventional heating are tightly covered by a flocculent silicate product. Moreover, a large amount of A1 and V and a small amount of Si are dissolved from samples under microwave heating, as revealed by the elemental analysis of leachates. Fourier transform infrared spectroscopic analysis also indicates a higher mass transfer coefficient in the diffusion layer of the raw material by microwave irradiation. When CaF2 is present, the reaction energy barrier is lowered and the leaching process is controlled by the tightly covered product layer, resulting in a prominent effect of mi- crowave irradiation.

关键词： vanadium extraction leaching microwave irradiation calcium fluoride synergistic effects

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Promoting effect of microwave irradiation on CeO2-TiO2 catalyst for selective catalytic reduction of NO by NH3

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Journal of Rare Earths 2020年第1期38卷 59-69页

作者： Jie Cheng Liyun Song Rui Wu Shining Li Yanming Sun Hongtai Zhu Wenge Qiu Hong He Key Laboratory of Beijing on Regional Air Pollution Control And Beijing Key Laboratory for Green Catalysis and SeparationBeijing University of TechnologyBeijing 100124China Collaborative Innovation Centre of Electric Vehicles in Beijing Beijing 100081China

In this work we prepared several CeO2-TiO2 catalysts for the NH3-SCR reactionusing co-precipitation with assistance of microwave irradiation.The catalytic NH3-SCR activities over CeO2-TiO2 catalysts at low temperatures are largely enhanced by the treatment of microwave irradiation,the operation temperature window is also broadened.For better understanding the promotion mechanism,the catalyst prepared by conventional co-precipitation with and without microwave irradiation treatment was characterized with H2-TPR,NH3-TPD,XPS,XRD and BET.microwave irradiation treatment accelerates the crystallite rate of CeO2-TiO2 catalysts,and greatly enlarges their surface area by adjusting their microstructures.The resistance to SO2 and H2O is also improved via regulating the hierarchical pore structure by the microwave irradiation.microwave irradiation treatment can also improve the redox property and increase the acid sites over the catalyst surfaces.The result of in situ DRIFTS suggests that the microwave irradiation treatment generates more Br?nsted acid sites on CeO2-TiO2-2 h catalyst,helpful in SCR reactions.XPS results show that after microwave irradiation on the CeO2-TiO2 catalysts,the surface demonstrates an elevated concentration of chemisorbed oxygen,consequently leading to better oxidation of NO to NO2.Additionally,the molar ratio of Ce3+/Ce4+has been elevated after being treated by microwave irradiation,a vital factor in enhancing the NH3-SCR activities.

关键词： SCR catalyst NH3-SCR Low temperature CeO2-TiO2 microwave irradiation Rare earths

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Synthesis and Crystal Structure of N-methyl-9-(4-bromophenyl)-1,2,3,4,5,6,7,8,9,10-decahydroacridine-1,8-dione under microwave irradiation

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Chinese Journal of Structural Chemistry 2005年第4期24卷 399-402页

作者： HUAGuo-Ping ZHANGXiao-Jing TUShu-Jiang ZHUSong-Lei LITuan-Jie ZHUXiao-Tong ZHANGJin-Peng XuzhouInstituteofArchitecturalTechnology XuzhouJiangsu221008China DepartmentofChemistry XuzhouNormalUniversityKeyLaboratoryofBiotechnologyonMedicalPlantXuzhouJiangsu221116China

The crystal structure N-methyl-9-(4-bromophenyl)-1,8-dioxo-1,2,3,4,5,6,7,8,9,10- decahydroacridine(C20H20BrNO2) was determined by single-crystal X-ray diffraction analysis. It belongs to P21/n space group, with a = 10.7999(18), b = 13.845(3), c = 11.4031(3) ?, β = 99.324(4)°, Dc = 1.525 g/cm3, Z = 4, λ = 0.71070 ?, μ(MoKα) = 2.455 mm-1, Mr = 386.28, V = 1682.5(5) ?3, F(000) = 792, the final R = 0.0463 and wR = 0.1053. In the crystal structure, the pyridine ring adopts a boat conformation, the two six-numbered rings fused with pyridine ring adopt twisting boat con- formation.

关键词： acridine synthesis microwave irradiation crystal structure

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A rapid and efficient synthesis of indoloquinolinone and its analogues under microwave irradiation

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Chinese Chemical Letters 2008年第5期19卷 518-520页

作者： Yu Jing Lu Ning Sun Zhi Shu Huang Lian Quan Gu School of Pharmaceutical Sciences Sun Yat-sen University Guangzhou 510275 China

A rapid and efficient method was established for the synthesis of indoloquinolinone and its analogues using acid-promoted cyclization in the present of PPA. All the reactions were completed in good yields in lOmin und... 详细信息

关键词： Indoloquinolinone analogues Synthesis microwave irradiation PPA

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Amide Hydrolysis Reaction Catalyzed by KF/Al2O3 under microwave irradiation and Solvent Free Conditions

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Chinese Journal of Chemistry 2011年第10期29卷 2209-2212页

作者：张袖丽罗凯陈巍王磊 Department of Chemistry Anhui Agricultural University Hefei Anhui 230036 China Department of Chemistry Huaibei Normal University Huaibei Anhui 235000 China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 China

A microwave-enhanced hydrolysis of amides utilizing KF/Al2O3 in the absence of solvents has been developed. Amines are produced in excellent yields along with the corresponding carboxylic acids.

关键词： amide hydrolysis KF/Al2O3 microwave irradiation solvent free amine

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