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Kinetics of Conversion of Methane with Electric Field Enhanced Plasma

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Chinese Journal of chemical engineering 2004年第1期12卷 131-133页

作者：王保伟许根慧孙洪伟 Key Laboratory of Green chemical technology of State Education Ministry School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Research Institute of Petroleum Processing Beijing 100083 China

Methane conversion was studied with electric field enhanced plasma (EFEP) technique at the atmosphere pressure and low temperature ranging from 323 K to 373 K. The conversion of methane is up to 60%-80%. The kinetics of methane conversion was studied using naicroreactor. The reaction model of power function type was obtained as: r = 90.99exp (-26980/RT)C0226A(mol·m-3·s-1). The global kinetics parameters were calculated by the variable simple-pure shape method. The calculating results are in good agreement with experimental data.

关键词： methane kinetics electric field plasma

Hydrogen production from methanol through dielectric barrier discharge

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Frontiers of chemical Science and engineering 2011年第2期5卷 209-214页

作者： baowei wang Xu ZHANG Haiying BAI Yijun LÜ Shuanghui HU Key Laboratory for Green chemical technology School of Chemical Engineering TechnologyTianjin UniversityTianjin 300072China

The hydrogen fuel cell is a promising option as a future energy resource and the production of hydrogen is mainly depended on fossil fuels *** this paper,methanol reforming to produce H2 through dielectric-barrier discharge(DBD)plasma reaction was *** of the power supply parameters,reactor parameters and process conditions on conversion of methanol and distribution of products were *** best reaction conditions were following:input power(45 W),material of inner electrode(stainless steel),discharge gap(3.40 mm),length of reaction zone(90.00 mm),dielectric thickness(1.25 mm),and methanol content(37.65%).The highest conversion of methanol and the yield of H2 were 82.38%and 27.43%,respectively.

关键词： methanol dielectric-barrier discharge hydro-gen plasma

Pd-Fe/a-AI203/cordierite monolithic catalysts for the synthesis of dimethyl oxalate： effects of calcination and structure

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Frontiers of chemical Science and engineering 2012年第3期6卷 259-269页

作者： Shengping wang Xin ZHANG Yujun ZHAO Yadong GE Jing LV baowei wang Xinbin MA Key Laboratory for Green chemical technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Cordierite monoliths coated with Pd-Fe/a- Al2O3 catalysts were prepared at various calcination temperatures and characterized by thermogravimetry, temperature-programmed reduction, transmission electron microscopy, diffuse reflectance infrared Fourier transfor- mation spectroscopy and X-ray diffraction. The performance of the catalytic monoliths for the synthesis of dimethyl oxalate （DMO） through a CO coupling reaction was evaluated. Monolithic catalysts with calcination temperatures ranging from 473 K to 673 K exhibited excellent dispersion of Pd, good CO adsorption properties, and excellent performance for the coupling reaction. The optimized monolithic catalyst exhibited a much higher Pd efficiency （denoted as DMO （g）.Pd （g）-1 h 1）（733h-1） than that of the granular catalyst （60.2 h-1）, which can be attributed to its honeycomb structure and the large pore sizes in the a-Al2O3 washcoat which was accompanied with an even distribution of the active component in the coating layer along the monoliths channels.

关键词： dimethyl oxalate coupling Pd cordierite,monolith calcination structure

Conversion of Methane by Steam Reforming Using Dielectric-barrier Discharg

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Chinese Journal of chemical engineering 2009年第4期17卷 625-629页

作者：张旭王保伟刘永卫许根慧 Key Laboratory for Green chemical technology of Ministry of Education School of Chemical Engineering Technology Tianjin University Tianjin 300072 China

Conversion of methane by steam reforming was carried out by means of dielectric-barrier discharge.A systemic procedure was employed to determine the suitable experimental *** was found that one of the plasma generators can match the system best.A higher power input can always bring a higher conversion,but the selectivity to C2H6 decreased from 52.48% to 39.43% as the power increased from 20W to *** discharge distance was 4mm,selectivities to almost all main products reached the *** inner electrode made of stainless steel and the outer electrode with aluminum foil were one of the best options which can obviously enhance the conversion of methane.A larger flow rate always resulted in a lower conversion of *** the most time,19.93% steam promoted conversion of methane.

关键词： methane steam dielectric-barrier discharge plasma

Theoretical Study of Reaction Paths and Transition States on Conversion Methane into C_2 Hydrocarbons Through Plasma

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Chinese Journal of chemical engineering 2007年第1期15卷 44-50页

作者：王保伟杨恩翠许根慧郝金库 Key Laboratory for Green chemical technology of State Education Ministry School of Chemical Engineering &TechnologyTianjin UniversityTianjin 300072China College of Chemistry and Life Sciences Tianjin Normal UniversityTianjin 300074China College of Chemistry and Life Sciences Tianjin Normal UniversityTianjin 300074 China

The direct synthesis of C2 hydrocarbons （ethylene, acetylene and ethane） from methane is one of the most important task in C1 chemistry. Higher conversion of methane and selectivity to C2 hydrocarbons can be real-ized through plasma reaction. In order to explore the reaction process and mechanism, the possible reaction paths （1）—（4） were proposed on coupling reaction of methane through plasma and studied theoretically using semi-PM3 method [PM3 is parameterization method of modified neglect of diatomic overlap （MNDO）] including determining the transition state, calculating the activation energy and thermodynamic state functions and analyzing the bond or-der and intrinsic reaction coordinate. The reaction heat results indicate that the reactions （2） and （4） are exothermic, while reactions of （1） and （3） are endothermic. The activation energy results show that activation energy for reac-tions （1） and （2） was much lower than that of reaction paths （3） and （4）. Therefore, paths （1） and （2） is the favorable reaction path energetically. More interestingly by comparing the intrinsic reaction coordinated （IRC） of the reaction paths （1） and （2）, it is found that the variations of bond lengths in reaction path （1） has a crucial effect on the poten-tial energy, while in reaction path （2）, the adjustment of the system geometry also contributes to the whole potential energy of the system.

关键词： reaction path transition state methane plasma PM3

Effects of CeO2 preparation methods on the catalytic performance of MoO3/CeO2 toward sulfur-resistant methanation

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Journal of Energy Chemistry 2017年第3期26卷 368-372页

作者： Dajun Meng baowei wang Zhen Liu Weihan wang Zhenhua Li Xinbin Ma Key Laboratory for Green chemical technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin UniversityTianjin 300072China

CeOsupports were prepared by calcination or precipitation method and 5% MoO/CeOcatalysts were prepared by incipient-wetness impregnation method. The catalytic performance of the 5% MoO/CeOcatalysts toward sulfur-resistant methanation was investigated. The results showed that the Mo/Ce-1 catalysts with CeOsupport prepared by calcination method exhibited the best sulfur-resistant methanation activity and stability with CO conversion as high as 75% while the Mo/Ce-3 catalysts the poorest. The supports and catalysts were characterized by N-adsorption–desorption, temperature-programmed reduction（TPR）, X-ray diffraction（XRD）, Raman spectroscopy（RS） and scanning electron microscope（SEM）. The results indicated that the saturated monolayer loading MoOon Ce-3 support was lower than 5% and there were some crystalline MoOparticles on the surface of the Mo/Ce-3. The preparation method of CeOhad a big influence on the specific surface area, the crystalline of CeO, and the catalytic performance of the corresponding Mo-based catalyst for sulfur-resistant methanation.

关键词： CeO2 supports MoO3 Sulfur-resistant methanation Synthetic natural gas

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O2介质阻挡放电微等离子体制备O3

化工学报 2020年第2期71卷 746-754页

作者：王保伟苏会娟姚淑美天津大学化工学院绿色合成与转化教育部重点实验室

介质阻挡放电(DBD)是工业生产臭氧(O3)最有效的方法。研究以O2为原料气采用DBD微等离子体放电制备O3,研究了放电间距、放电长度、放电功率以及停留时间对产生O3的影响。此外,通过向正弦AC等离子体电源中叠加调制脉冲,探讨了脉冲占空比... 详细信息

介质阻挡放电(DBD)是工业生产臭氧(O3)最有效的方法。研究以O2为原料气采用DBD微等离子体放电制备O3,研究了放电间距、放电长度、放电功率以及停留时间对产生O3的影响。此外,通过向正弦AC等离子体电源中叠加调制脉冲,探讨了脉冲占空比与调制频率对O3生成的影响。结果表明:O3浓度与DBD反应器的放电间距呈负相关,与O2的停留时间呈正相关,放电功率及有效放电长度对O3浓度的影响呈现火山形变化趋势。综合考虑O3浓度及能量产率确定了适宜的参数。与普通正弦交流电源相比,在其基础上叠加脉冲调制电源有利于O3的产生,而能量产率与占空比呈正相关,与调制频率呈负相关,据此确定了合适的占空比与调制频率。

关键词：氧化反应器制备介质阻挡放电臭氧微等离子体

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介质阻挡放电等离子体反应器降解盐酸四环素

化工学报 2018年第4期69卷 1687-1694页

作者：王保伟王超徐艳彭叶平姚淑美天津大学化工学院绿色合成与转化教育部重点实验室天津300072

采用介质阻挡放电等离子体反应器降解盐酸四环素(TC),研究了输入功率、放电间距、气体流量、初始浓度等参数对盐酸四环素降解效果的影响,结果表明当输入功率为1.3W,放电间距为2.5 mm,气体流量为150ml·min^(-1),初始浓度为100 mg·L^(-1... 详细信息

采用介质阻挡放电等离子体反应器降解盐酸四环素(TC),研究了输入功率、放电间距、气体流量、初始浓度等参数对盐酸四环素降解效果的影响,结果表明当输入功率为1.3W,放电间距为2.5 mm,气体流量为150ml·min^(-1),初始浓度为100 mg·L^(-1)时降解效果最好,放电处理30 min盐酸四环素的降解率达到92%。动力学研究表明盐酸四环素的降解过程符合拟二级动力学方程。检测了降解过程中生成的中间产物,提出了盐酸四环素的降解路径与机理。

关键词：介质阻挡放电废水盐酸四环素降解机理氧化

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燃煤烟气同时脱硫脱硝技术进展

化学工业与工程 2020年第3期37卷 1-9页

作者：姚淑美王保伟天津大学化工学院绿色合成与转化教育部重点实验室天津300072

煤炭仍是我国能源的主要原料,其燃烧排放的SO2和NOx依然是主要污染源之一。对近期燃煤烟气同时脱硫脱硝的液相吸收技术、紫外高级氧化技术、低温等离子体技术、电子束技术、臭氧前置氧化结合化学吸收技术和干法催化再生技术进行了详细... 详细信息

煤炭仍是我国能源的主要原料,其燃烧排放的SO2和NOx依然是主要污染源之一。对近期燃煤烟气同时脱硫脱硝的液相吸收技术、紫外高级氧化技术、低温等离子体技术、电子束技术、臭氧前置氧化结合化学吸收技术和干法催化再生技术进行了详细的总结和评述,分析了对SO2和NOx脱除效率的影响因素,并对技术的应用进行了展望。

关键词：脱硫脱硝烟气