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Kinetic study of methane hydrate formation in the presence of carbon nanostructures

Petroleum Science 2019年第3期16卷 657-668页

作者： Saeid Abedi-Farizhendi Mina Iranshahi Abolfazl Mohammadi Mehrdad Manteghian Amir H. Mohammadi Faculty of chemical engineering Tarbiat Modares University Tehran Iran department of Petroleum engineering South Tehran Branch Islamic Azad University Tehran Iran department of chemical engineering University of Bojnord Bojnord Iran Institut de Recherche en Genie Chimique et Petrolier (IRGCP) Paris Cedex France Discipline of chemical engineering School of Engineering University of KwaZulu-Natal Howard College Campus King George V Avenue Durban 4041 South Africa

The effect of synthesized nanostructures,including graphene oxide,chemically reduced graphene oxide with sodium dodecyl sulfate(SDS),chemically reduced graphene oxide with polyvinylpyrrolidone,and multi-walled carbon nanotubes,on the kinetics of methane hydrate formation was investigated in this *** experiments were carried out at a pressure of 4.5 MPa and a temperature of 0 ℃ in a batch *** adding nanostructures,the induction time decreases,and the shortest induction time appeares at certain concentrations of reduced graphene oxide with SDS and graphene oxide,that is,at a concentration of 360 ppm for reduced graphene oxide with SDS and 180 ppm for graphene oxide,with a 98% decrease in induction time compared to that in pure ***,utilization of carbon nanostructures increases the amount and the rate of methane consumed during the hydrate formation *** of multi-walled carbon nanotubes with a concentration of 90 ppm showes the highest amount of methane *** amount of methane consumption increases by 173% in comparison with that in pure *** addition of carbon nanostructures does not change the storage capacity of methane hydrate in the hydrate formation process,while the percentage of water conversion to hydrate in the presence of carbon nanotubes increases considerably,the greatest value of which occurres at a 90 ppm concentration of carbon nanotubes,that is,a 253% increase in the presence of carbon nanotubes compared to that of pure water.

关键词： Clathrate hydrate Kinetics Carbon nanostructures Graphene oxide SDS PVP

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Synthesis and morphology control of raspberry-like poly(ethylene terephthalate)/polyacrylonitrile microspheres

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Chinese chemical Letters 2016年第2期27卷 195-199页

作者： Yong-Fei Xu Mo-Zhen Wang Qi-Chao Wu Xiao Zhou Xue-Wu Ge CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and Engineering University of Science and Technology of China School of Materials and chemical engineering Anhui Jianzhu University Guangdong Tianan new Material Co. Ltd.

The fabrication of raspberry-like poly（ethylene terephthalate）/polyacrylonitrile（PET/PAN） microspheres by g-ray radiation-induced polymerization of acrylonitrile on micron-sized PET microspheres were first reported in this work. A PET emulsion was firstly prepared by dispersing a PET solution with 1,1,2,2-tetrachloroethane/phenol mixture as the solvent into an aqueous solution of sodium dodecyl ***, PET microspheres were formed by precipitating the PET emulsion droplets from ethanol. The influence of the PET solvent and the weight ratio of ethanol to PET emulsion on the morphology of the PET microspheres had been investigated. After the surface of the prepared PET microspheres was grafted with poly（acrylic acid）, the grafting polymerization of AN also had been successfully initiated by g-ray radiation to form PAN microspheres with a size of about 100 nm on the PET microspheres. This work provides a new method to fabricate micron-sized PET microspheres, and further expands the functionalization of PET and its application fields.

关键词： PET emulsion Emulsion precipitation PET microsphere Raspberry-like microsphere PET/PAN composite microspheres

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Comprehensive Investigations of the Cl+CH_(3)OH→HCl+CH_(3)O/CH_(2)OH Reaction:Validation of Experiment and Dynamic Insights

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CCS Chemistry 2020年第5期2卷 882-894页

作者： Dandan Lu Jun Li Hua Guo School of Chemistry and chemical engineering&Chongqing Key Laboratory of Theoretical and Computational Chemistry Chongqing UniversityChongqing 401331 department of Chemistry and chemical Biology University of New MexicoAlbuquerqueNew Mexico 87131

Cl+CH_(3)OH→HCl+CH_(3)O/CH_(2)OH is a prototypical multiple-channel ***,ample dynamical and kinetic information is available,but there are still many uncertainties concerning the reaction *** investigations are rare due to the absence of a potential energy surface(PES),which has greatly hindered our understanding of the reaction *** a machine-learning approach,an accurate full-dimensional PES for the title reaction based on tens of thousands of high-level ab initio data is *** dynamical calculations were performed on the PES using quasi-classical trajectories,and the results provide insights into the reaction kinetics and *** calculated non-Arrhenius rate coefficients are consistent with the experimental data,attributable to a complex-forming mechanism at low *** high energies,the reaction is dominated by a direct mechanism,which results in dominant forward scattering via a stripping mechanism augmented by less prominent sideways and backward scattering via a rebound *** collision energies of 5.6 and 8.7 kcal/mol,the measured product translational energy and ro-vibrational state distributions of HCl are well *** addition,mode specificity is revealed and rationalized by the sudden vector projection *** work sheds valuable light on the microscopic mechanism and dynamics of this prototypical multichannel reaction.

关键词： potential energy surface transition state multichannel reaction mode specificity mechanism reaction dynamics kinetics

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Artificial neural network model for predicting drill cuttings settling velocity

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Petroleum 2020年第4期6卷 340-352页

作者： Okorie E.Agwu Julius U.Akpabio Adewale Dosunmu department of chemical and Petroleum engineering University of UyoAkwa Ibom StateNigeria department of Petroleum and Gas engineering University of PortHarcourtRivers StateNigeria

The traditional method of using the coefficient of drag–Reynolds number relationship to predict cuttings settling velocity involves an implicit procedure that requires repeated,time-consuming and tedious iterations using newtonian or mostly non-newtonian ***,these correlations are limited to certain fluid flow ***,most of the explicit and direct cuttings settling velocity models that exist are based on the assumption that the cuttings are spherical ***,in the field,the cuttings are a mixture of various shapes and are hardly spherical,hence these models when applied to field conditions come off with huge *** objective of this work was to use a nature-inspired algorithm(artificial neural network-ANN)to develop a model for estimating cuttings settling velocity that would be robust and useful in the field that would take into account the shape of the *** data used for this work was obtained from research experiments in the *** model was then evaluated using four performance metrics namely:mean squared error(MSE),root mean square error(RMSE),sum of squares error(SSE)and goodness of fit(R2).It was found that the model's predictions obtained in this work agreed with experimental ***,the developed model possesses the capacity to generalize across new input datasets and can be applied to particles of any shape,hence,defining the novelty of this research and bridging the gap between theory and *** compared with state-of-the-art models,the developed models show a high degree of robustness,as the ANN model performed reasonably well with an MSE of 7.5×10−4,an R2 of 0.978,RMSE of 0.0274 and SSE of *** generalize the results across new input datasets,the developed model was cross-validated with new data that was not part of the training *** was found that the ANN model had an MSE value 0.00807,RMSE of 0.0898,MAE of 0.065,SSE of 2.74 and MAPE of 0.675%.To ensure the replicabi

关键词： Drill cuttings Artificial neural network Mud Cuttings settling velocity

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Effects of Laser Pulse Numbers on Surface Biocompatibility of Titanium for Implant Fabrication

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Journal of Biomaterials and Nanobiotechnology 2015年第3期6卷 168-175页

作者： Mitra Radmanesh Amirkianoosh Kiani department of Mechanical engineering University of New Brunswick Fredericton Canada

Generally, materials with high biocompatibility are more appropriate for bone and tissue transplant applications, due to their higher effectiveness in the healing process and infection problems. This study presents the effects of laser surface texturing on the surface topography properties, roughness, and wettability of thin titanium sheets, which consequently enhance the biocompatibility of this material. Creating line patterns across the surfaces, the titanium samples are prepared using variety of laser parameters. The apatite inducing ability of each sample is tested through the use of simulated body fluid (SBF). The final biocompatibility level of titanium samples is analyzed through wettability, surface angle measurements, and average surface temperature profile. Overall, the effects of laser parameter, pulse numbers, upon the biocompatibility of titanium are thoroughly examined, with results indicating that a scanning speed of 100 μm/ms results in desirable bone type apatite inducing abilities across the surface of treated titanium sheets.

关键词： Laser Surface Micro Texturing Titanium Implant Biocompatability Hydroxyapatite Deposition

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Dynamic Oxygen Storage Capacity Measurements on Ceria-Based Material

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Journal of Rare Earths 2007年第1期25卷 48-52页

作者：沈美庆王欣全安源翁端赵敏伟王军 School of chemical engineering & Technology Key Laboratory for Green Chemical Technology of State Education Ministry Tianjin UniversityTianjin 300072 ChinaState Key Laboratory of Engine Tianjin UniversityTianjin 300072 China School of chemical engineering & Technology Key Laboratory for Green Chemical Technology of State Education Ministry Tianjin UniversityTianjin 300072 China department of Material Science & engineering Tsinghua UniversityBeijing 100086 China

Dynamic oxygen storage and release capability （OSC） measurement apparatus was designed to evaluate the OSC performance of ceria-based oxygen storage material. The optimum measurement condition was at a frequency of 0.1 Hz with the inlet gas-flow sequence CO （5S）→O2（5S）→CO→O2 and a flow rate of 300 ml·min^-1. Under this condition, similar regular square wave in the inlet and outlet of the reactor was obtained to guarantee the reliability of the dynamic OSC results. The dynamic OSC performance of the CeO2 and Ce0.67Zr0.33O2 mixed oxide prepared using the citric sol-gel method was studied at the optimum measurement condition with focus on both quantitative and qualitative analyses, The results reveal distinctly that Ce0.67Zr0.33O2 had better dynamic OSC performance because of its higher oxygen migration rate than CeO2. Under dynamic conditions, two CO2 production peaks occurred corresponding to the CO pulse and the O2 pulse, respectively, during the entire cycle. The intensity and ratio between the two CO2 productions were highly influenced by temperature and frequency indicating complex surface phenomena during the oxygen storage/release process, As a result, this set-up can be applied to the evaluation of ceria-based material on the OSC performance.

关键词： oxygen storage capacity ceria-based oxygen storage material dynamic OSC measurement rare earths

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An efficient bifunctional Ni-Nb_(2)O_(5)nanocatalysts for the hydrodeoxygenation of anisole

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Chinese Journal of chemical engineering 2022年第9期35卷 187-197页

作者： Juan Xu Ping Zhu Islam HEl Azab Ben Bin Xu Zhanhu Guo Ashraf YElnaggar Gaber AMMersal Xiangyi Liu Yunfei Zhi Zhiping Lin Hassan Algadi Shaoyun Shan Faculty of chemical engineering Kunming University of Science and TechnologyKunming 650500China College of chemical engineering Southwest Forestry UniversityKunming 650224China Yunnan Province Special Equipment Safety Inspection and Research Institute Kunming 650228China department of Food Science and Nutrition College of ScienceTaif UniversityTaif 21944Saudi Arabia department of Mechanical and Construction engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon Tyne NE18STUK Integrated Composites Lab(ICL) Department of Chemical&Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA department of Chemistry College of ScienceTaif UniversityTaif 21944Saudi Arabia Taizhou university Taizhou 31800China department of Electrical engineering Faculty of EngineeringNajran UniversityNajran 11001Saudi Arabia

The Ni-Nb_(2)O_(5)nanocatalysts have been prepared by the solgel method,and the catalytic hydrodeoxygenation(HDO)performance of anisole as model compound is *** results show that Nb exists as amorphous Nb_(2)O_(5)species,which can promote Ni *** addition of Nb_(2)O_(5)increases the acidity of the ***,when the content of niobium is high,there is an inactive Nb-Ni-O mixed *** size and morphology of Ni grains in catalysts are different due to the difference of Nb/Ni molar *** Ni_(0.9)Nb_(0.1)sample has the largest surface area of 170.8 m^(2)·g^(-1)among the catalysts prepared in different Nb/Ni molar ratios,which is mainly composed of spherical nanoparticles and crack *** HDO of anisole follows the reaction route of the hydrogenation HYD *** Ni_(0.9)Nb_(0.1)catalyst displayed a higher HDO performance for anisole than Ni *** selectivity to cyclohexane over the Ni_(0.9)Nb_(0.1)sample is about 10 times that of Ni catalyst at 220℃and 3 MPa H_(2).The selectivity of cyclohexane is increased with the increase of reaction *** anisole is almost completely transformed into cyclohexane at 240℃,3 MPa H_(2)and 4 h.

关键词： Hydrodeoxygenation(HDO) Catalysts Ni-Nb_(2)O_(5) Solgel method Anisole

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Review of Microplastic Pollution in the Environment and Emerging Recycling Solutions

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Journal of Renewable Materials 2019年第12期7卷 1251-1268页

作者： Gregory Reimonn Taofeng Lu Neeti Gandhi Wan-Ting Chen department of Plastic engineering University of Massachusetts LowellLowellMA01854USA School of chemical engineering Purdue UniversityWest LafayetteIN47906USA.

Microplastic pollution represents a side-effect stemming from a global plastic waste mismanagement problem and includes degraded particles or mass produced plastic particles less than 5 mm in largest *** small nature of microplastics gives this area of pollution different environmental concerns than general plastic waste in the *** biological toxicity of particles,their internal components,and their surface level changes all present opportunities for these particles to adversely affect the environment around ***,it is necessary to review the current literature surrounding this topic and identify areas where the study of microplastic can be pushed *** we present current methods in studying microplastics,some of the ways by which microplastics affect the environment and attempt to shed light on how this research can *** addition,we review current recycling methods developing for the processing of mixed-plastic *** methods,including hydrothermal processing and solvent extraction,provide a unique opportunity to separate plastic waste and improve the viability of the plastics recycling industry.

关键词： Microplastic pollution additive toxicology marine plastic pollution plastic recycling sustainability

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Reaction Mechanism and Dynamic Investigations of Poly-channel Decomposition Reactions of o-Pyridyl Radical

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Chinese Journal of Chemistry 2005年第8期23卷 1017-1020页

作者：程学礼李丽清李桂新赵燕云李衍飞 department of Chemistry Taishan University Tai'an Shandong 271021 China department of Biological engineering Taishan University Tai'an Shandong 271021 China department of chemical engineering Taishan University Tai'an Shandong 271021 China

Utilizing Gaussian94 program package, all species involved in decomposition reactions of o-pyridyl radical were optimized fully at B3LYP/6-311＋＋G^＊＊ level. Intrinsic reaction coordinate calculations were employed to confirm the connections of the transition states and products, and transition states were ascertained by the number of imaginary frequency （0 or 1）. The reaction mechanism was elucidated by the vibrational mode analysis and electronic population analysis, and the reaction rate constants were calculated with transition state theory.

关键词： o-pyridyl free radical vibrational mode analysis population analysis reaction rate constant

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Performance variability of Ba0.5Sr0.5Co0.8Fe0.2O3-δ cathode on proton-conducting electrolyte SOFCs with Ag and Au current collectors

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Rare Metals 2018年第8期37卷 633-641页

作者： Ting-Ting Wan An-Kang Zhu Hai-Bo Li Chun-Chang Wang You-Min Guo Zong-Ping Shao Oumarou Savadogo School of Physics and Materials Science Anhui UniversityHefei 230601China State Key Laboratory of Materials-Oriented chemical engineering College of Chemistry and Chemical EngineeringNanjing University of TechnologyNanjing 210009China department of chemical engineering Curtin UniversityPerth W A 6845.Australia Laboratory of new Materials for Electrochemistry and Energy Polytechnique MontrealC.P.6079Succursale Centre-VilleMontr6alQC H3C 3A7Canada

Ba0.5Sr0.5Co0.8Fe0.2O3-δ （BSCF） is one of the most active cathode materials and shows significant hydration effect suggesting possible proton conductivity. In this study, the performance of BSCF cathode on a protonconducting BaZr0.1Ce0.7Y0.2O3-δ（BZCY） electrolyte with silver and gold current collectors was determined. The electrochemical characteristics of the symmetrical and anode-supported cell with diluted silver electrode, silver current collector or gold current collector on BSCF electrode were compared. The significant result is that, although the diluted silver electrode itself shows poor operation stability, the silver current collector has strong electrocatalytic contribution to the BSCF cathode performance on the proton-conducting electrolyte, leading to higher cell performance than that with the gold current collector.

关键词： Solid oxide fuel cell Proton conductor Agcurrent collector Operation stability

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