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DBU-based CO2 absorption-mineralization system: reaction process,feasibility and process intensification

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Chinese Journal of Chemical Engineering 2020年第4期28卷 1145-1155页

作者： Cong Luo Kejing Wu Hairong Yue Yingying Liu Yingming Zhu Wei Jiang Houfang Lu Bin Liang School of Chemical Engineering Sichuan UniversityChengdu 610065China Institute of New Energy and Low-carbon Technology Sichuan UniversityChengdu 610207China

Amine-based carbon dioxide(CO2)capture is still limited by high desorption energy *** CO2 into carbonate is a safer and more permanent *** this work,calcium oxide(CaO)is introduced to perform chemical desorption instead of thermal desorption on 1,8-diazabicyclo[5.4.0]undec-7-ene(DBU)aqueous solution after CO2 *** X-ray diffraction(XRD)patterns of solid products show the formation of calcite calcium carbonate(CaCO3),which prove the feasibility of this *** effects of reaction temperature,reaction time and Ca2+/CO32-molar ratios on the related reactions in CO2 absorption-mineralization process and CaCO3 precipitation are discussed,and purer CaCO3 is obtained by ultrasonic *** CaCO3 content can be increased to 95.8%and the CO2 desorption ratio can achieve 80%by 30 min ultrasonic dispersion treatment under the conditions(40℃,180 min,Ca2+/CO32-molar ratio=1.0).After five cycles,DBU aqueous solution shows stable CO2 absorption and mineralization *** transform infrared spectroscopy(FT-IR)spectra of the reaction process also indicate the regeneration of the *** with thermal desorption,this process is exothermic,almost without no additional heat.

关键词： CO2 mineralization CaCO3 1,8-Diazabicyclo[5.4.0]undec-7-ene aqueous reaction process

Tracking the reaction process and Mechanism Study of Iron（Ⅲ） Complex with ESI-MS

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Tracking the Reaction Process and Mechanism Study of Iron（...

Self-assembled synthesis of oxygen-doped g-C3N4 nanotubes in enhancement of visible-light photocatalytic hydrogen

第三届全国质谱分析学术报告会

作者： Zhong-Hong Zhu Hui-Feng Wang Ming-Hua Zeng Department of Chemistry and Pharmaceutical Sciences Guangxi Normal University

Electrospray Ionization mass spectrometry（ESI-MS） is used to track the reaction process of FeL3 Cl2 and its behavior in solution, combined with the theoretical calculation, tandem reaction mechanism is put *** precipitates were dissolved in methanol, and the reaction solutions diluted with methanol for ESI-MS measurements.1,2,3 The 1-6 were obtained under positive mode. 1-4 are from sediment and 5-6 are from reaction solutions. At the beginning, the main composition from sediment is 4 [FeIII2（L1）5（CH3 OH）2+H]+（calc. 1037.14）. But the main composition 5 and 6 from the reaction solutions correspond to the species [FeIII（L1’）Cl2]+（calc. 233.94） and [FeIII（L1’）2 Cl2]+（calc. 342.01）, respectively. For 5 minutes at 100 °C, the main composition of sediment is 3 [NaFeIII（L1）Cl（CH3 O）（CH3 OH）4（H2 O）]+（calc. 463.04）, and the low intensity 2 is [FeIII（L2）Cl（CH3 OH）]+（calc. 385.03）. From 15 minutes to 4 hours at 100 °C, 2 is the main composition of precipitates, and by 12 hours the 1 is [FeIII（L3）（CH3 O）（CH3 OH）]+（calc. 379.06） what is more abundant.

关键词： ESI-MS Track reaction process Mechanism

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Journal of Energy Chemistry 2021年第3期30卷 36-44页

作者： Yizeng Zhang Zhiwu Chen Jinliang Li Zhenya Lu Xin Wang School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640GuangdongChina Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy MaterialsDepartment of PhysicsJinan UniversityGuangzhou 510632GuangdongChina

Currently,photocatalytic water splitting is regarded as promising technology in renewable energy ***,the conversion efficiency suffers great restriction due to the rapid recombination of charge *** designed the structure and doping elements become important alternative routes to improve the performance of *** this work,we rational designed oxygen-doped graphitic carbon nitride(OCN)nanotubes derived from supermolecular intermediates for photocata lytic water *** as prepared OCN nanotubes exhibit an outstanding hydrogen evolution rate of 73.84μmol h^(-1),outperforming the most of reported one dimensional(1D)g-C_(3)N_(4) *** to the rational oxygen doping,the band structure of g-C_(3)N_(4) is meliorated,which can narrow the band gap and reduce the recombination rate of photogene rated ***,the hollow nanotube structure of OCN also provide multiple diffuse reflection during photocata lytic reaction,which can significantly promote the utilization capacity of visible light and enhance the photocatalytic water splitting *** is believed that our work not only rationally controls the nanostructure,but also introduces useful heteroatom into the matrix of photocatalyst,which provides an effective way to design high-efficiency g-C_(3)N_(4) photocatalyst.

关键词： Graphitic carbon nitride Oxygen-doped Nanotube Photocatalytic water splitting reaction process

Storage-reduction strategy for NO_(x) reduction from gas turbine exhaust with W-Ti-CeO_(x) catalyst in natural gas power plants

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Journal of Rare Earths 2023年第6期41卷 933-940,I0005页

作者： Ningyuan Wang Xiaoqiang Wang Yue Liu Zhongbiao Wu Department of Environmental Engineering Zhejiang UniversityHangzhou 310058China College of Biological Chemical Science and EngineeringJiaxing UniversityJiaxing 314001China

Traditional vanadium-based selective catalytic reduction(SCR)deNO_(x) catalyst can hardly adapt to the gas conditions(much high NO_(2)/NO_(x) ratio at lower temperature)of the start-up and low loading periods for a gas ***,a W-Ti-CeO_(x) catalyst with NO_(x) storage and reduction(NSR)function was developed in this work for gas turbine exhaust NO_(x) *** experimental results reveal that W-Ti-CeO_(x) catalyst exhibits high NO_(2) adsorption capacity at relatively low temperature while that is quite low for V-W/TiO_(2).The abundant surface Ce^(3+) species can be mainly responsible for its high adsorption ability owing to the reaction between NO_(2) and Ce^(3+) to form nitrate/nitrite species and ***,the adsorption capacity of W-Ti-CeO_(x) can easily regenerate at medium-high temperature and NH_(3)-SCR ***,W-Ti-CeO_(x) also shows good NH_(3)-SCR activity,which can fulfill the deNO_(x) process at high *** addition of W and Ti into ceria can enhance the surface acidity and redox ability,thereby increasing the SCR *** work proposes a novel storage-reduction strategy for NO_(x) elimination throughout the operation of gas turbines.

关键词： W-Ti-CeO_(x)catalyst Gas turbine NO_(x)storage and reduction NH_(3)-SCR reaction process Rare earths

reaction dynamics in the combustion synthesis system of Al-CrO_3-Al_2O_3-NaF-N_2-O_2

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Journal of University of Science and Technology Beijing 2007年第3期14卷 261-265页

作者： Dazheng Yang Yue Zhang Degang Li Dianwei Qi Wei Deng Dayong Xun Angang Steel Company Limited Anshan 114001 China State Key Lab for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

A new material with heat-resistant and adiabatic characteristics and high strength was prepared using the combustion synthesis method by mixed powders of CrO3, Al, Al2O3, and NaF in atmospheric gas. The reaction dynamic process of the Al-CrO3-NaF-Al2O3-N2-O2 new material system by the combustion synthesis method was discussed based on the observation results by SEM, EDS, and XRD in combination with the combustion front quenching method （CFQM） and the relation curves between reaction free enthalpies and the corresponding temperatures. The combustion synthesis mechanism and the formation reasons of the phase in the combustion product were analyzed.

关键词： combustion front quenching method (CFQM) reaction process combustion synthesis (CS) adiabatic materials

IN SITU processING OF Al_(2)O_(3) WHISKERS REINFORCED Ti-Al INTERMETALLIC COMPOSITES

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Acta Metallurgica Sinica(English Letters) 2006年第6期19卷 432-440页

作者： F.Wang Z.K.Fan J.F.Zhu School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China School of Materials Science and Engineering Shaanxi University of Science and TechnologyXianyang 712081China

In situ Al2O3 whiskers reinforced Ti-Al intermetallic composites were fabricated at ~1200℃ by reaction sintering of cold-consolidated fillets consisting mainly of Ti, Al, and different additives. The phases and microstructures of the sintered composites were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS). The process of synthesis was investigated using differential thermal analysis (DTA). The effects of processing parameters and additives on the microstructures of the composites and the development of whisker were examined. It is found that the morphology of the whisker is strongly influenced by the additives, the exothermal reaction process, and the processing parameters.

关键词： in situ Al2O3 whisker Ti-Al intermetallic composite additive reaction process

The process of TiB_2-Cu Composite Phase and Structure Formation during Combustion Synthesis

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Journal of Wuhan University of Technology(Materials Science) 2006年第4期21卷 113-116页

作者：徐强 School of Materials Science and Engineering Beijing Insitute of TechnologyBeijing 100081China

The reaction process of combustion synthesis for TiB2 -Cu was investigated in detail using combustion-wave arresting experiment, X-ray diffraction （ XRD ） analysis, SEM analysis and differential thermal analysis （ DTA ）. The XRD analysis results for the different parts of the quenched specimen show that TiCux intermetallic phase firstly forms with the propagation of combustion wave, and then Ti1.87 B50 and Ti3B4 metastable phases come forth due to the diffusion of B atoms and finally the stable TiB2 phase forms because of the continuous diffusion of B atoms. The formation of TiB2 phase is uot completed by one step, but undergoes several transient processes. The process of reaction synthesis for Ti-B-Cu ternary system can be divided into three main stages： melting of Cu and Ti , and the formation of Cu- Ti melt and few TiCux , TiBx intermetallic phases ; large numbers of TiCux intermetallic phases formation and some fine TiB2 particles precipitation ; and the TiB2 particles coarsening and the stable TiB2 and Cu two phases formation in the final product.

关键词： combustion synthesis reaction process TiB2 phase combustion-wave arresting experiment

Experimental study and theoretical analysis on the effect of electric field on gas explosion and its propagation

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Journal of Coal Science & Engineering(China) 2011年第2期17卷 147-151页

作者： YE Qing LIN Bai-quan JIAN Cong-guang JIA Zhen-zhen Hunan Province Key Laboratory of Safety Mining and Technology of Coal Mine Hunan University of Science and TechnologyXiangtan 411201 China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology Xuzhou 221008China Yima Coal lndustry Group Co. Ltd. Yima 472300 China

The effect of the electric field with different intensity on explosion wave pressure and flame propagation velocity of gas explosion was experimentally studied, and the effect of electric field on gas explosion and its propagation was theoretically analyzed from heat transportation, mass transportation, and reaction process of gas explosion. The results show that the electric field can affect gas explosion by enhancing explosion intensity and explosion pressure, thus increasing flame velocity. The electric field can offer energy to the gas explosion reaction; the effect of the electric field on gas explosion increases with the increase of electric field intensity. The electric field can increase mass transfer action, heat transfer action, convection effects, diffusion coefficient, and the reaction system entropy, which make the turbulence of gas explosion in electric field increase; therefore, the electric field can improve flame combustion velocity and flame propagation velocity, release more energy, increase shock wave energy, and then promote the gas explosion and its propagation.

关键词： electric field gas explosion explosion wave pressure flame propagation reaction process

Facile construction of Bi2Mo3O12@Bi2O2CO3 heterojunctions for enhanced photocatalytic efficiency toward NO removal and study of the conversion process

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Chinese Journal of Catalysis 2020年第2期41卷 268-275页

作者： Wangchen Huo Tong Cao Weina Xu Ziyang Guo Xiaoying Liu Hong-Chang Yao Yuxin Zhang Fan Dong State Key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Research Center for Environmental Science&Technology Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu 611731SichuangChina Department of Physics Chongqing UniversityChongqing 401331China Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationCollege of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001HenanChina

Charge separation and transformation are some of the key requirements for high-efficiency photocatalysis. The photocatalytic reaction mechanism provides a guideline for the development and commercialization of high-efficiency photocatalysts. In this study, we designed and favorably synthesized BMO@BOC heterojunctions via a facile solvothermal route and applied the heat treatment method for application in high-efficiency photocatalytic NO removal. More importantly, both continuous stream and intermittent stream methods with in situ diffuse reflectance infrared Fourier transform spectroscopy were applied to intuitively and dynamically investigate the adsorption process and oxidation process of NO removal over the photocatalyst surface. The intermediate products(NO-, NO2-, and NO2) were explicitly detected in both the adsorption process and oxidation process, whilst the final product(NO3-) appeared only in the oxidation process, owing to the separation, migration, and conversion of photoinduced electron-hole pairs.

关键词： Heterojunction NO removal Photocatalysis In situ DRIFTS reaction process