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Preparation of phosphorus-doped carbon nanospheres and their electrocatalytic performance for O_2 reduction

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Journal of Natural Gas Chemistry 2012年第3期21卷 257-264页

作者： Ziwu Liu Feng Peng Hongjuan Wang Hao Yu Wenxu Zheng xianyong wei School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640GuangdongChina Key Laboratoryof Coal Processing and Efficient Utilization(Ministry of Education) China University of Mining&TechnologyXuzhou 221008JiangsuChina Institute of Biomaterial&College of Science South China Agricultural UniversityGuangzhou 510642GuangdongChina

Phosphorus-doped carbon nanospheres without any metal residues were synthesized and characterized. The results revealed that the doping phosphorus atoms could significantly improve the electrocatalytic activity of graphitic carbon for the oxygen-reduction reaction （ORR） both in acidic and alkaline media, and the materials exhibited high electrocatalytic activity, long-term stability, and excellent tolerance to crossover effects especially in alkaline media. Quantum mechanics calculations with the density functional theory demonstrated that the changes in charge density and energetic characteristics of frontier orbitals for the P-doped graphene sheet could facilitate the ORR.

关键词： varbon nanosphere oxygen reduction electrocatalysis carbon catalysis phosphorus doping

CO2-hierarchical activated carbon prepared from coal gasification residue: Adsorption equilibrium, isotherm, kinetic and thermodynamic studies for methylene blue removal

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Chinese Journal of Chemical Engineering 2020年第6期28卷 1694-1700页

作者： Yuhong Kang xianyong wei Guanghui Liu Miao Mu Xiangrong Ma Yong Gao Zhimin Zong Key Laboratory of Coal Processing and Efficient Utilization Ministry of EducationChina University of Mining&TechnologyXuzhouJiangsu 221116China Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization School of Chemistry and Chemical EngineeringYulin UniversityYulinShaanxi 71900China

Mineral matter in a residue(RC G)from coal gasification(CG)was removed by two-stage acid *** activated carbon(HAC)was prepared by activating RC Gwith *** performance of HAC on removing methylene blue(MB)from an aqueous solution was *** was characterized by N2 adsorption–desorption isotherm,Fourier transform infrared spectroscopy,and scanning electron *** results show that HAC exhibits hierarchical pore structure with high specific surface area(862.76 m2·g-1)and total pore volume(0.684 cm3·g-1),and abundant organic functional *** adsorption equilibrium data of MB on HAC are best fitted to the *** kinetic data show that the pseudo-first-order model is more suitable at low MB concentration,while the advantages of the pseudo-second-orderand the Elovich models are more obvious as the concentration *** to the thermodynamic parameters,the HAC-MB adsorption process is spontaneous and endothermic.

关键词： Residue from coal gasification Hierarchical activated carbon Physical activation Adsorption models

An evidence for the strong association of N-methyl-2-pyrrolidinone with some organic species in three Chinese bituminous coals

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Chinese Science Bulletin 2008年第8期53卷 1157-1164页

作者： LIU ChanMin ZONG ZhiMin JIA JiXian LIU GuangFeng wei xianyong School of Chemical Engineering China University of Mining and Technology Xuzhou 221008 China School of Life Sciences Xuzhou Normal University Xuzhou 221116 China Key Laboratory of Coal Conversion and New Carbon Materials of Hubei Province Wuhan University of Science and Technology Wuhan 430081. China

Three Chinese bituminous coals collected from Shenfu, Heidaigou and Feicheng coal fields were re- spectively extracted with carbon-disulfide/N-methyl-2-pyrrolidinone (CS2/NMP) mixed solvent (volume ratio 1:1) at room temperature followed by distillation of CS2 under ambient pressure and subsequent removal of most of NMP by distillation at 110℃ under reduced pressure to afford mixed sol- vent-extractable fractions (MSEFs) with small amount of NMP. Acetone-extractable fraction 1 (AEF1) was obtained by extracting each MSEF under ultrasonic irradiation at room temperature and subse- quently using a Soxhlet extractor. Direct extraction of each bituminous coal affords acetone-soluble fraction 2 (AEF2). GC/MS analysis shows that m/z of base or secondary peak in mass spectra of a se- ries of components from each AEF1 is 98, whereas such components were not detected in AEF2. Since m/z of base peak in mass spectrum of NMP itself is 99, the base or secondary peak at m/z 98 should result from loss of α-H from NMP, i.e., NMP is strongly associated with some organic species (OSs) and thereby the components detected with base or secodary peak at m/z 98 in their mass spectra should be associated NMP-OS.

关键词： N-甲基-2-吡咯烷基烟煤 GC/MS分析相互作用

Synergistic CO_(2) mineralization using coal fly ash and red mud as a composite system

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International Journal of Coal Science & Technology 2024年第3期11卷 149-158页

作者： Zhenchao Yao Yugao Wang Jun Shen Yanxia Niu Jiang Feng Yang xianyong wei School of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuanShanxi030024China Key Laboratory of Coal Processing and Efficient Utilization Ministry of EducationUniversity of Mining&Technology221116XuzhouJiangsuChina

CO_(2) mineralization plays a critical role in the storage and utilization of CO_(2).Coal fly ash(CFA)and red mud(RM)are widely utilized as CO_(2) ***,the inert calcium species in CFA limit its carbonation capacity,meanwhile the substantial Ca^(2+)releasing of RM is hindered by a covering layer of calcium *** this study,CO_(2) mineralization in a composite system of CFA and RM was investigated to enhance the carbonation *** analyzers were employed to characterize the raw materials and resulting mineralization *** results demonstrated that a synergistic effect existed in the composite system of CFA and RM,resulting in improving CO_(2) mineralization rate and *** produced calcium carbonate was ectopically attached the surface of CFA in the composite system,thus slowing down its coverage on the surface of *** phenomenon facilitated further releasing Ca^(2+)from the internal RM,thereby enhancing CO_(2) mineralization ***,the inclusion of RM significantly improved the alkalinity of the composite system,which not only promoted the dissolution of Ca^(2+)of the inert CaSO_(4)(H_(2)O)_(2) in CFA,but also accelerated CO_(2) mineralization *** investigation would be beneficial to CO_(2) mineralization using industrial solid wastes.

关键词： CO_(2)mineralization Coal fly ash Red mud Synergistic effect

A study on the catalytic performance of Pd/γ-Al_(2)O_(3),prepared by microwave calcination,in the direct synthesis of dimethylether

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Frontiers of Chemical Science and Engineering 2010年第4期4卷 452-456页

作者： Ruizhi CHU xianyong wei Zhimin ZONG Wenjia ZHAO Key Laboratory of Coal Processing and Efficient Utilization(Ministry of Education) China University of Mining&TechnologyXuzhou 221008China Hubei Coal Conversion and New Carbon Materials Key Laboratory Wuhan University of Science and TechnologyWuhan 430081China

A series of Pd/γ-Al_(2)O_(3) hybrid catalysts were prepared by impregnation and subsequent calcination under microwave *** catalysts were used for direct synthesis of dimethylether(DME)from *** results show that calcination under microwave irradiation improved both the activity and selectivity of the catalysts for DME *** optimum power of the microwave was determined to be 420 *** such optimum conditions,CO conversion,DME selectivity and time space yield of DME were 60.1%,67.0%,and 21.5 mmol$mL-1$h^(-1),*** on various characterizations such as nitrogen physisorption,X-ray diffraction,COtemperature-programmed desorption,and Fourier transform infrared spectral analysis,the promotional effect of the microwave irradiation on the catalytic property was mainly attributed to both the higher dispersion of Pd and the significant increase in the adsorption on the CO-bridge of *** irradiation with very high power led to the increase in CO-bridge adsorption and thereby decreased the catalytic activity,whereas the coverage by metallic Pd of the active sites on acidicγ-Al_(2)O_(3) significantly occurred under microwave irradiation with very low power,resulting in a decrease in the selectivity to DME.

关键词： Pd/γ-Al_(2)O_(3) direct synthesis dimethyl ether calcination under microwave irradiation

Characterization of nitrogen-containing aromatics in Baiyinhua lignite and its soluble portions from thermal dissolution

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Chinese Journal of Chemical Engineering 2019年第11期27卷 2783-2787页

作者： Yangyang Zhang xianyong wei Jinghui Lü Hao Jiang Fangjing Liu Guanghui Liu Zhimin Zong Key Laboratory of Coal Processing and Efficient Utilization Ministry of EducationChina University of Mining&TechnologyXuzhou 221116China State Key Laboratory of High-efficiency Utilization and Green Chemical Engineering Ningxia UniversityYinchuan 750021China Department of Chemical Engineering College of Chemical EngineeringHenan Polytechnic UniversityJiaozuo 454003China

Soluble portions(SPs) 1-4(SP1-SP4) were afforded from sequentially dissolution and alkanolyses of Baiyinhua lignite(BL) in cyclohexane,CH3OH,CH3CH2OH,and(CH3)2CHOH at 300℃.They were analyzed with a gas chromatograph/mass spectrometer and quadrupole exactive orbitrap mass spectrometer(QEOTMS) with an atmosphere pressure chemical ionization source in positive-ion mode,while BL was characterized with an X-ray photoelectron spectrometer(XRPES).The results show that the yields of SP2 and SP3 are much higher than those of SP1 and SP4,and the total SP yield is ca.39.0%.According to the analysis with XRPES,pyrrolic nitrogen atoms are the most abundant nitrogen existing forms in *** of nitrogen-containing aromatics(NCAs) were resolved with QEOTMS and their molecular masses are mainly in the range of 200-450 *** main NCAs are N1O1 and N1O2 class species with double bond equivalent values of 4-18 and carbon numbers of *** nitrogen atoms appear in pyridine s,quinolines,benzoquinolines or acridine,and dibenzoquinolines or naphthoquinolines,while the oxygen atoms exist in methoxy and furan rings.

关键词： Lignite Sequential thermal dissolution and alkanolyses Nitrogen-containing aromatics

Synthesis of light hydrocarbons over Fe/AC catalysts

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International Journal of Mining Science and Technology 2012年第2期22卷 209-212页

作者： Zhao Jianjun Zong Zhimin Wang Taotao Liu Tong wei xianyong Departrnent of Applied Chemistry and Environment Engineering Bengbu CollegeBengbu 233030China School of Chemical Engineering and Technology China University of Mining&TechnologyXuzhou 221008China

A series of Fe/AC catalysts for catalytic hydrogenation of CO to light hydrocarbons(LHCs) were prepared by decomposing Fe(CO)5 in an *** catalysts activities were tested in a high-pressure micro *** results show that both CO conversion and LHCs selectivity were significantly affected by the amount of Fe loaded onto the *** optimum Fe content was determined to be 10% by weight of the *** the corresponding catalyst(i.e.,10% Fe/C catalyst),the conversion of CO and the selectivity of LHCs were 94.8% and 59.2%,respectively,at 360 °*** on various catalyst characterization techniques,such as XRD,BET and SEM,the catalysts surface areas and pore volume decreased and the smaller particles agglomerated at the edges and corners in the outer region of the support with the increasing Fe *** agglomerated particles increased greatly when the iron content of the catalyst was higher than 10%.The decrease of catalyst activity can be due to the agglomerated particles.

关键词： CO hydrogenationFe/AC catalystsLight hydrocarbonsParticles agglomerated

New progress in the processing and efficient utilization of coal

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Mining Science and Technology 2011年第4期21卷 547-552页

作者： Zhao Yuemin Liu Jiongtian wei xianyong Luo Zhenfu Chen Qingru Song Shulei Key Laboratory of Coal Processing Er Efficient Utilization of Ministry of Education China University of Mining ＆ Technology Xuzhou 221116 China

Coal accounts for about 70% of the primary energy sources in China. The environmental pollution and resources waste involved with coal processing and utilization are serious. It is therefore urgent to develop highly-efficient coal resources utilization theory and methods with low-carbon discharge. Based on our long-term basic research and technology development, the progress in beneficiation, cleaning, and trans- formation of coal, which includes dense phase fluidized bed dry beneficiation, deep screening of wet fine coal, micro-bubble flotation column separation, molecular coal chemistry, and transformation and sepa- ration of coal and its derivatives into value-added chemicals under mild conditions, is discussed.

关键词： Coal Low-carbon discharge Separation Coal conversion

Microwave-assisted hydroxylation of benzene to phenol with H_2O_2 over FeSO_4/SiO_2

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Mining Science and Technology 2010年第1期20卷 93-96页

作者： LIU Tong wei xianyong ZHAO Jianjun XIE Hengsen WANG Taotao ZONG Zhimin School of Chemical Engineering and Technology China University of Mining & Technology Xuzhou 221008 China Key Laboratory of Coal Conversion and New Carbon Materials Wuhan University of Science & Technology Wuhan 430081 China

Hydroxyl radicals HO are generated under Fenton-like (Fe2++H2O2→HO?+OH?+Fe3+) catalytic conditions upon microwave irradiation. Liquid-phase direct catalytic oxidation of benzene to phenol was obtained using FeSO4 supported on silica gel as a solid catalyst and hydrogen peroxide as the oxidant. The effects of various parameters, such as the different solvents, the amount of solvent used, the amount of catalyst used, the reaction time, the reaction temperature and the amount of hydrogen peroxide used on the yield of phenol were studied to identify optimum reaction conditions. Conventionally heated reaction gives a phenol yield of 0.6%. A higher phenol yield of 13.9% with a selectivity of 100% is obtained when the reaction mixture was irradiated with micro-wave energy. It is concluded that microwave irradiation offers more effective control of energy input for hydroxyl radical generation that is appropriate for various synthetic reactions.

关键词： hydroxyl radicals Fenton catalytic conditions microwave energy