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Synthesis of SAPO-34 using metakaolin in the presence of β-cyclodextrin

Journal of Energy Chemistry 2015年第4期24卷 401-406页

作者： Chen Zhang Xuchen Lu Tizhuang Wang State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of Sciences (CAS) University of Chinese Academy of Sciences United Research Center for Resource and Materials

SAPO-34 molecular sieves were synthesized by the addition of β-cyclodextrin（β-CD） as crystal growth inhibitor using metakaolin as silicon and aluminum sources. Properties of the obtained samples were characterized by XRD,SEM,N2adsorption–desorption,FTIR,XRF,EDX,NH293-TPD andSi MAS NMR. When β-CD was added,crystal size of the SAPO-34 crystals decreased. Variation of Si content from the crystal center to surface decreased while total Si content hardly changed.29 Si MAS NMR results showed that β-CD contributed to better Si dispersion and decreased the size of Si（4Si） patches. Moreover,the MTO（methanol-to-olefin） process was conducted to investigate the influence of β-CD on catalytic performance. The synthesized sample with molar ratio of β-CD/Al2O3 equaling 0.055 remained active for 610 min while the sample synthesized without β-CD for only 280 min,which indicates that the lifetime of catalyst synthesized with β-CD is greatly prolonged.

关键词： SAPO-34 Metakaolin β-cyclodextrin Acidity MTO process

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The selective catalytic reduction of NOx with CH4 on La1-xSrxMnO3 (x=0.2, 0.4) catalysts

The selective catalytic reduction of NOx with CH4 on La1-xSr...

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International Conference on Power engineering, ICOPE 2015

作者： Zhang, Hang Li, Na Zhou, Qulan Lv, Chen Huang, Sijia Shen, Jizhao State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Huazhong University of Science and Technology Wuhan430074 China Fujian Electric Power Survey and Design Institute Fuzhou350003 China Yangzhou Chenguang Special Equipment Co. Ltd. Yangzhou225800 China

Two kinds of typical perovskite catalysts La1-xSrxMnO3 (x=0.2, 0.4) as new catalysts for using in CH4-NO and CH4-N2O reaction is proposed, and the preparation method, characterization, catalytic activity of La1-xSrxMnO3 was investigated. The catalysts powder via sol-gel method was successfully synthesized in this paper. In addition, the catalytic activity of supported La1-xSrxMnO3 catalyst was tested in fixed bed reactor, and the effects O2 concentration on catalyst activity were explored at three different temperatures, 600°C, 700°C and 800°C. The catalytic reduction of NO and N2O by CH4 over La0.8Sr0.2MnO3 and La0.6Sr0.4MnO3 catalyst was performed separately. The conversion ratio of N2O was usually higher than that of NO when the temperature and other conditions were the same. With the decrease of temperature, the range of O2 concentration becomes narrower obviously on the NO conversion. However, the O2 content doesn't seem to have significant in fluence on the N2O conversion ratio. The La0.8Sr0.2MnO3 performed better on the reaction of CH4 and N2O when temperature increased, wh ile the La0.6Sr0.4MnO3 performed best on 700°C with a ratio of about 90%. © 2015 The Japan Society of Mechanical Engineers.

关键词： Perovskite

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Progress in hydrogen enriched hydrocarbons combustion and engine applications

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Frontiers in Energy 2014年第1期8卷 73-80页

作者： Zuohua HUANG Jinhua WANG Erjiang HU Chenglong TANG Yingjia ZHANG State Key Laboratory of Multiphase Flow in Power Engineering Xi'anJiaotong University Xi'an 710049 China

The paper summarized the work on hydrogen enriched hydrocarbons combustion and its application in engines. The progress and understanding on laminar burning velocity, flame instability, flame structure flame and chemical kinetics were presented. Based on funda- mental combustion, both homogeneous spark-ignition engine and direct-injection spark-ignition engine fueled with natural gas-hydrogen blends were conducted and the technical route of natural gas-hydrogen combined with exhaust gas recirculation was proposed which experimen- tally demonstrated benefits on both thermal efficiency improvement and emissions reduction.

关键词： hydrogen enriched hydrocarbon combustion,fundamental study engine application

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Insights into cellulose dissolving in ionic liquids by molecular simulation

Insights into cellulose dissolving in ionic liquids by molec...

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Innovations of Green Process engineering for Sustainable Energy and Environment 2015 - Topical Conference at the 2015 AIChE Annual Meeting

作者： Liu, Xiaomin Li, Yao Zhao, Yuling Wang, Jianji Zhang, Suojiang State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Key Laboratory of Green Chemical Media and Reactions Ministry of Education School of Chemistry and Environmental Science Henan Normal University Xinxiang Henan453007 China

ISBN: (纸本)9781510818521

Ionic liquids (ILs) have been used in an enormous number of chemical and biological processes. In recent years, great progress has been made in the dissolution of cellulose with ILs. However, the mechanism of cellulose dissolution has not been clearly understood. [1,2] Molecular simulations were performed to investigate the effects of cation and anion structures on cellulose dissolution in ILs. It was found that the presence of electron-withdrawing group in alkyl chain of the cation enhanced the interaction between the cation and cellulose by comparing the interaction energy between [Amim]+ and [C3mim]+ with cellulose.[3] Effects of anionic structure on the dissolution of cellulose in ILs revealed that hydrogen bonds (HBs) were formed between anions of the ILs and hydroxyl protons of cellulose. we also investigated the effects of electronegativity of HB acceptor atoms, steric effect of alkyl chain length and electron-withdrawing group of the anions on their HB acceptor ability. [4] Furthermore, molecular simulations were performed to depict the cosolvent effect of cellulose dissolution in imidazolium-based ILs. DMSO partially breaks down the ionic association of [C4mim][CH3COO] by solvation of the cation and anion, but no preferential solvation was observed. The dissociated anions would readily interact with cellulose to improve the dissolution of cellulose. [5] Besides, the spontaneous dissolution process was investigated through all-atom molecular dynamics simulations of cellulose bunche in EmimAc and EmimCl within 0.5∼2μs. Synergistic effect of cations and anions was revealed by analysing the whole dissolving process in EmimAc. Initially, cations bind to the side face of cellulose bunch and anions insert into the cellulose strands to form HBs with hydroxyl groups. Then cations start to intercalate into cellulose chains due to their strong electrostatic interaction with the anions.

关键词： Cellulose

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Synthesis and photocatalytic activity of hierarchical flower-like SrTiO_3 nanostructure

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Science China Materials 2015年第3期58卷 192-197页

作者：赖小勇王呈睿金泉于然波王丹 State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of Sciences Department of Physical Chemistry University of Science and Technology Beijing

A hierarchical flower-like Sr Ti O3 nanostructure was synthesized by a simple and direct hydrothermal *** products were characterized by X-ray diffraction,scanning electron microscopy,and transmission electron *** characterizations suggest that the as-synthesized SrT iO 3 crystal has eight symmetric branches growing along the ?111? direction and each branch has many ordered small laminae,forming a well-defined flower-like *** adjusting the pH value of the reaction system,the morphology could be changed continuously from flower-like structure to cube,then to *** hierarchical flower-like SrT iO 3 nanostructure exhibits a higher photocatalytic activity for degrading Rhodamine B than its cubic and spherical counterparts.

关键词：分级纳米结构花状钛酸锶

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Removal of gaseous elemental mercury and nitrogen oxides in bubbling reactors with sodium hypochlorite aqueous solution

Removal of gaseous elemental mercury and nitrogen oxides in ...

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International Conference on Power engineering, ICOPE 2015

作者： Li, Na Chen, Lu Zhou, Qulan Shen, Jizhao State Key Laboratory of Multiphase Flow in Pow er Engineering Xi'an Jiaotong University Xi'an City Shaanxi Province710049 China Collaborative Research Center for Energy Energy Engineering Institute of Industrial Science University of Tokyo 4-6-1 Komaba Meguro-ku Japan Yangzhou Chenguang Special Equipment Co. Ltd. Yangzhou225800 China

The conditions for sodium hypochlorite aqueous solution (NaClO(aq)) o xidizing and absorbing gaseous elemental mercury (Hg0(g)) and nitrogen oxides (NOx(g)) were examined. First, some chemical thermodynamic parameters for NaClO(aq) removing Hg0(g) and NOx(g) were calculated, including the standard Gibbs free energy change ΔGθ, standard equilibrium constant Kθ, standard enthalpy change ΔHθ, to theoretically prove the possibility for NaClO(aq) removing Hg0(g) and NOx(g). Next, the idea fo r NaClO(aq) simultaneously removing Hg0(g) and NOx(g) was propounded. And a technical scheme fo r simultaneously removing Hg0(g) and NOx(g) in flue gas was designed. Then, to check the feasibility of this technical scheme, an experiment for NaClO(aq) removing Hg0(g) and NOx(g) was carried out, a mass transfer model based on bubbling reactors for calculating overall mass transfer coefficient was established, the effects of NaClO(aq) concentration, NaClO(aq) temperature, NaClO(aq) pH on Hg0(g) and NOx(g) removal efficiencies and their mass transfer processes were investigated, Hg0(g) and NOx(g) removal processes and mechanisms were analyzed. © 2015 The Japan Society of Mechanical Engineers.

关键词： Mass transfer

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Experimental research on simultaneous removal of CO2, SO2 and NOx by amine-sulphone solution

Experimental research on simultaneous removal of CO2, SO2 an...

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International Conference on Power engineering, ICOPE 2015

作者： Li, Lian Bin, Hu Li, Na Zhou, Qulan Zhang, Yi Shen, Jizhao State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China North China Power Engineering Co. Ltd China Power Engineering Consulting Group Beijing100120 China Department of Housing and Circumjacent Property Management Xi'an Jiaotong University Xi'an710049 China Yangzhou Chenguang Special Equipment Co. Ltd. Yangzhou225800 China

Environmental problems caused by CO2, SO2, NOx and other pollutants have become increasingly prominent. It has been a research hotspot to remove CO2, SO2 and NOx simultaneously with simple technique, relative lo w operation cost. We made amine-sulphone solution with N-methyl-diethanolamine (MDEA) and dimethyl sulfoxide (DMSO) as the absorbent of SO2/CO2/NOx. A bubbling bed absorption system was designed and built to investigate the absorption properties of amine-sulphone solution toSO2/CO2/NOx. The solution formula and working condition were discussed to figure out the optimu m choices of formula, solution concentration and flo w rate of flue gas. According to the regulations of absorption rate, absorptive amount and removal ratio, the solution formula with 52.5%MDEA+17.5%DMSO showed the best simultaneous absorption properties to SO2/CO2/NOx. And 70% were the optimum concentration choice for the of amine-sulphone solution, taking absorbent cost, mass transfer and absorption quality into consideration. There's a flow rate inflexion point for the absorption of each gas, which is the boundary of rapid dropping and stable interval of removal ratio. The minimum of inflexion point for SO2/CO2/NOx was the optimu m flue gas flo w rate for high removal ratio and low cost, which was 1L/min in the experiment. © 2015 The Japan Society of Mechanical Engineers.

关键词： Carbon dioxide

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Novel flow behaviors induced by a solid particle in nanochannels: Poiseuille and Couette

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Chinese Science Bulletin 2014年第20期59卷 2478-2485页

作者： Cheng-Zhen Sun Wen-Qiang Lu Bo-Feng Bai Jie Liu State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University College of Physical Sciences University of Chinese Academy of Sciences

We conducted a molecular dynamics(MD)simulation to address the novel flow behaviors induced by a solid particle in *** basic flows,i.e.,Poiseuille and Couette,are involved in this *** Poiseuille flow,the distribution of number density exhibits fluctuations in the center of channel and near the walls,which are caused by the strong interactions from the atoms of particle and *** stronger external driving forces,the fluid atoms move toward the center of channel and some cavities appear in the fluidic *** external driving forces and bigger particles make the fluid moving quickly in *** Couette flow,the particle rotates under the velocity difference among particle atoms in the shear *** fluid atoms near the walls become infrequent and move to the center of *** velocities of the centrally-located fluid atoms decrease owing to the particle,resulting in an untypical non-linear Couette *** summary,the solid particle brings new fluid–solid interface and interactions,which induce several novel behaviors in nanochannel flows.

关键词：流动行为纳米通道固体粒子 Poiseuille流诱发 Couette流强相互作用固体颗粒

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Simulation of the PHEBUS FPT-1 experiment using MELCOR and exploration of the primary core degradation mechanism

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Annals of Nuclear Energy 2015年 85卷 193-204页

作者： Jun Wang Michael L. Corradini Wen Fu Troy Haskin Yapei Zhang Wenxi Tian Guanghui Su Suizheng Qiu State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China College of Engineering The University of Wisconsin-Madison Madison 53706 United States Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China

Core degradation evaluation of probability, progression and consequences of a core degradation accident is critical for evaluation of risk as well as its mitigation. However, research and modeling of severe accidents to date are limited, and their accuracy in predicting severe accident consequences is still insufficient. It is therefore important to explore the mechanisms of core degradation and to develop mitigation measures for severe accidents. PHEBUS FPT1 is a typical and classic core degradation experiment. MELCOR is a world famous severe accident analysis code developed by Sandia National Lab that has seen wide application, a broad user base, and a number of supporting experiments. The PHEBUS experiment was simulated using MELCOR in this paper. Experimental data on, thermal power and steam mass flow rates are used to determine average pressure, energy distribution, molten mass, temperature of the fuel, and hydrogen generation. Data from the PHEBUS experiment and Cho’s calculations are used to compare the average pressure, several fuel temperatures and the hydrogen generation rate. The results confirm the validity of MELCOR’s simulation of the PHEBUS experiment. The temperature distribution of the core is provided. These results are used to determine the mode and behavior of core degradation with the intent of building a foundation for further research.

关键词： PHEBUS FPT1 MELCOR Core degradation

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Regeneration Kinetics of Spent FCC Catalyst via Coke Gasification in a Micro Fluidized Bed

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Procedia engineering 2015年 102卷 1758-1765页

作者： Yuming Zhang Guogang Sun Shiqiu Gao Guangwen Xu State Key Laboratory of Heavy Oil Processing China University of Petroleum-Beijing Beijing 102249 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China

In the present study, the spent fluid catalytic cracking (FCC) catalyst is regenerated via coke gasification instead of combustion in a micro fluidized bed reactor to investigate its reaction characteristics and kinetic parameters. The reaction rate first increased with carbon conversion ratio and then slowly decreased when reaching the peak. H 2 and CO was found to be over 70 vol.% in the gasification gas. Two reaction models, homogenous model (HM) and shrinking core model (SCM) were used to calculate the kinetic parameters of catalyst regeneration, finding that HM had better fitting relevance for the data than SCM. The activation energy from these two models was close to each other, that is, about 150 kJ . mol -1 for the coke gasification over FCC catalyst.

关键词： FCC catalyst Steam gasification Micro-fluidized bed Regeneration kinetics.

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