检索结果-南通市图书馆

Journal of Natural Gas Chemistry 2012年第4期21卷 400-406页

作者： Wenhua Wang Zhao Zhang shengfu ji State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China

A novel particle/metal-based monolithic catalysts dual-bed reactor with beds-interspace supplementary oxygen is constructed comprising of the upper-layer 5 wt%Na2WO4-2 wt%Mn/SiO2 particle catalyst and the under-layer 3 wt%Ce-5 wt%Na2WO4-2 wt%Mn/SBA-15/Al2O3/FeCrA1 metal-based monolithic catalyst as well as a side tube in the interspaces of two layers for supplementing 02. The reaction performance of oxidative coupling of methane （OCM） in the dual-bed reactor system is evaluated. The effects of the reaction parameters such as feed CH4/O2 ratio, reaction temperature and side tube feed 02 flowrate on the catalytic performance are investigated. The results indicate that the suggested mode of dual-bed reactor exhibits an excellent performance for OCM. CH4 conversion of 33.2%, C2H4 selectivity of 46.5% and C2 yield of 22.5% could be obtained, which have been increased by 6.4%, 4.1% and 5.5%, respectively, as compared with 5 wt%Na2WO4-2 wt%Mn/SiO2 particle catalyst in a single-bed reactor and increased by 10.7%, 31.9% and 17.7%, respectively, as compared with 3 wt%Ce-5 wt%Na2WO4-2 wt%Mn/SBA-15/Al2O3/FeCrA1 metal-based monolithic catalyst in a single-bed reactor. The effective promotion of OCM performance in the reactor would supply a valuable reference for the industrialization of OCM process.

关键词： OCM dual-bed reactor particle catalyst monolithic catalyst construction

Hydrogen generation from methanolysis of sodium borohydride over Co/Al_2O_3 catalyst

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2012年第5期21卷 488-494页

作者： Dongyan Xu Lin Zhao Ping Dai shengfu ji College of Chemical Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina College of Electromechanical Engineering Qingdao University of Science and TechnologyQingdao 266061ShandongChina State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China

Co/Al2O3 catalyst is prepared with an impregnation-chemical reduction method and used to catalyze the methanolysis of sodium borohydride （NaBH 4） for hydrogen *** solution temperature of 0 C,the methanolysis reaction can be effectively accelerated using Co/Al2O3 catalyst and provide a desirable hydrogen generation rate,which makes it suitable for applications under the circumstance of low environmental *** byproduct of methanolysis reaction is analyzed by X-ray diffraction （XRD） and Fourier transform infrared spectroscopy （FTIR）.The characterization results indicate that methanol can be easily recovered after methanolysis reaction by hydrolysis of the methanolysis byproduct,NaB（OCH 3） *** catalytic activity of Co/Al2O3 towards NaBH 4 methanolysis can be further improved by appropriate calcination *** catalytic methanolysis kinetics and catalyst reusability are also studied over the Co/Al2O3 catalyst calcined at the optimized temperature.

关键词： hydrogen generation sodium borohydride methanolysis cobalt

Catalytic steam reforming of biomass over Ni-based catalysts: Conversion from poplar leaves to hydrogen-rich syngas

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2011年第4期20卷 377-383页

作者： Lingyan Cao Zhigang jia shengfu ji jinyong Hu State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China

A series of Ni/SBA-15 catalysts with Ni contents from 5 wt%–20 wt%and CaO-12.5%Ni/SBA-15 catalysts with CaO contents from 1.4 wt%– 9.8 wt%have been *** structure of the catalysts was characterized using X-ray diffraction（XRD）,N2 adsorption-desorption,transmission electron microscopy（TEM）and X-ray photoelectron spectroscopy（XPS）.The performance of catalytic steam reforming of the poplar leaves to the hydrogen-rich syngas was tested in a fixed-bed *** results indicate that the 7.0wt%CaO-12.5wt%Ni/SBA-15 catalyst exhibits the best performance for the catalytic steam reforming of poplar leaves to hydrogen-rich *** ratio of H2：CO can reach ca 5：1 in the hydrogen-rich *** yield of H2 can reach 273.30 mL/g（poplar leaves）.In the CaO-Ni/SBA-15 catalyst,Ni active component mainly fills the role of catalytic steam reforming of the poplar leaves,and CaO active component mainly plays the role as water-gas shift and CO2 sorbent.

关键词： biomass steam reforming hydrogen-rich syngas Ni-basic catalyst CaO

Oxidative coupling of methane in a dual-bed reactor comprising of particle/cordierite monolithic catalysts

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2010年第6期19卷 600-604页

作者： Deng Pan shengfu ji Wenhua Wang Chengyue Li State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijng 100029 China

A dual-bed reactor was constructed comprising of a 5%Na2WO4-2%Mn/SiO2 particle catalyst and a 4%Ce-5%Na2WO4-2%Mn/SiO2 /cordierite monolithic *** reaction performance of the oxidative coupling of methane （OCM） over the dual-bed reactor system was *** effects of the bed height and operation mode,as well as the reaction parameters such as reaction temperature,CH4/O2 ratio and flowrate of feed gas,on the catalytic performance were *** results indicated that the suggested dual-bed reactor exhibited a good performance for the OCM reaction when the feed gases firstly passed through the particle catalyst bed and then to the monolithic catalyst bed.A CH4 conversion of 38.2% and a C2H4 selectivity of 43.3% could be obtained using the dual-bed reactor with a particle catalyst bed height of 10 mm and a monolithic catalyst bed height of 50 *** the CH4 conversion and C2H4 selectivity have increased by 2.5% and 12.8%,respectively,as compared with the 5%Na2WO4-2%Mn/SiO2 particle catalyst in a conventional single-bed reactor and by 12.9% and 23.0%,respectively,as compared with the 4%Ce-5%Na2WO4-2%Mn/SiO2 /cordierite monolithic catalyst in a single-bed *** catalytic performance of the OCM in the dual-bed reactor system has been improved remarkably.

关键词： oxidative coupling of methane dual-bed reactor monolithic catalysts

Effect of O_2 and H_2O on the tri-reforming of the simulated biogas to syngas over Ni-based SBA-15 catalysts

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2010年第4期19卷 369-374页

作者： Daoan Sun Xiujin Li shengfu ji Lingyan Cao State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China Department of Environmental Engineering Beijing University of Chemical Technology Beijing 100029 China

A series of Ni/SBA-15 catalysts with Ni contents from 7.5 wt% to 15 wt% were prepared by impregnation *** effect of O2 and H2O on the combined reforming of the simulated biogas to syngas was investigated in a continuous flow fixed-bed *** stability of the catalyst was tested at 800 ？*** results indicated that 10wt%Ni/SBA-15 catalyst exhibited the highest catalytic activities for the combined reforming of the simulated biogas to *** the reaction conditions of the feed gas molar ratios CH4/CO2/O2/H2O = 2/1/0.6/0.6,GHSV = 24000 ml·gcat^-1·h^-1 and the reaction temperature T = 800 ℃,the conversions of CH4 and CO2 were 92.8% and 76.3%,respectively,and the yields of CO and H2 were 99.0% and 82.0%,*** catalytic activities of the catalyst did not decrease obviously after 100 h reaction time on stream.

关键词： biogas reforming syngas oxygen steam Ni-based catalyst SBA-15

Synthesis of mesoporous γ-AlOOH@Fe_3O_4 magnetic nanomicrospheres

在线全文

学校读者我要写书评

暂无评论

Particuology 2012年第6期10卷 751-758页

作者： Yuanyuan Zheng shengfu ji Hongfei Liu Ming Li Hao Yang State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

Mesoporous γ-AIOOH@Fe3O4 magnetic nanomicrospheres were synthesized using superparamagnetic Fe304 nanoparticles as the core and aluminum isopropoxide （ALP） as the aluminum source. The obtained magnetic nanomicrospheres were characterized by X-ray powder diffraction （XRD）, transmission electron microscopy （TEM）, scanning electron microscopy （SEM）, N2 adsorption-desorption and vibrating sample magnetometry （VSM）. The effects of preparation parameters such as hydrolysis time of AIP, concentration of AlP and coating layer number on microspheres were investigated. The results indicated that the mesoporous γ-AIOOH@Fe3O4 magnetic nanomicrospheres consisted of a mesoporous γ-AIOOH shell and a Fe3O4 magnetic core. The diameter of γ-AIOOH@Fe3O4 nanomicrospheres was about 200 nm, the thickness of mesoporous γ-AIOOH shell was about 5 nm and the average pore size was 3.8 nm. The thickness of the mesoporous γ-AIOOH shell could be controlled via layer-by-layer coating times. The formation mechanism of the mesoporous γ-AIOOH shell involved a ＂chemisorption-hydrolysis＂ process.

关键词： Magnetic nanomicrospheres Fe3O4 γ-AIOOH shellMesoporousHydrolysis

Metal-organic framework MIL-53(Al): synthesis, catalytic performance for the Friedel-Crafts acylation, and reaction mechanism

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2015年第10期58卷 1544-1552页

作者： Junlei Yan Sai jiang shengfu ji Da Shi Hefei Cheng State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

Metal-organic framework MIL-53(Al) was synthesized by a solvothermal method using aluminum nitrate as the aluminium source and 1,4-benzenedicarboxylic acid(H2BDC) as the organic ligand. The structure of samples was characterized by X-ray diffraction(XRD) and Fourier transform infrared spectroscopy(FT-IR). The catalytic activity and recyclability of MIL-53(Al) catalyst for the Friedel-Crafts acylation reaction of indole with benzoyl chloride were evaluated. The reaction conditions were optimized and a reaction mechanism was suggested. The results showed that the MIL-53(Al) catalyst exhibited good catalytic activity and recyclability for the Friedel-Crafts acylation reaction. When the molar ratio of indole and MIL-53(Al) catalyst was 1:0.06(n1:ncatalyst), the molar ratio of indole and benzoyl chloride was 1:3, and the solvent was dichloromethane, the conversion of indole could reach 97.1% and the selectivity of 3-acylindole could reach 81.1% at 25 °C after 8 h. The catalyst can be reused without significant degradation in catalytic activity. After the catalyst was reused five times, the conversion of indole was 87.6% and the selectivity of 3-acylindole was 79.5%.

关键词： MIL-53(Al) catalyst Friedel-Crafts acylation indole 3-acylindoles

Effect of Ni Loading and Ce_(x)Zr_(1-x)O_(2) Promoter on Ni-Based SBA-15 Catalysts for Steam Reforming of Methane

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2007年第2期16卷 139-147页

作者： Huijun Wan Xiujin Li shengfu ji Bingyao Huang Kai Wang Chengyue Li State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China Department of Environmental Engineering Beijing University of Chemical Technology Beijing 100029 China

A series of Ni/SBA-15 catalysts with Ni contents ranging from 5wt% to 20wt% as well as 10wt%Ni/10wt%CexZr1-xO2/SBA-15 （x=0, 0.5, 1） were prepared. The structures of the catalysts were characterized using XRD, TPR, TEM and BET techniques. The catalytic activities of the catalysts for steam reforming of methane were evaluated in a continuous flow microreactor. The results indicated that both the Ni/SBA-15 and the Ni/CexZr1-xO2/SBA-15 catalysts had good catalytic activities at at- mospheric pressure. The 10wt%Ni/SBA-15 catalyst exhibited excellent stability at 800 ℃ for time on stream of 740 h. After the reaction, carbon deposits were not formed on the surface of the catalyst. There existed a regular hexagonal mesoporous structure in the Ni/SBA-15 and the Ni/CexZr1-xO2/SBA-15 catalysts. The nickel species and the CexZr1-xO2 component were all confined in the SBA-15 mesopores. The CexZr1-xO2 could promote dispersion of the nickel species in the Ni/CexZr1-xO2/SBA-15 catalysts.

关键词： Ni-based catalyst SBA-15 methane steam reforming syngas

Effect of MgO promoter on Ni-based SBA-15 catalysts for combined steam and carbon dioxide reforming of methane

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2008年第3期17卷 225-231页

作者： Bingyao Huang Xiujin Li shengfu ji Bao Lang Fabien Habimana Chengyue Li State Key Laboratoly of Chemical Resource Engineering Beijing University of Chemical Technology. Beijing 100029. China Department of Environmental Engineering Beijing University of Chemical Technology Beijing 100029 China

A series of Ni/SBA-15 catalysts with Ni contents ranging from 5 wt% to 15 wt%, as well as another series of 10%Ni/MgO/SBA-15 catalysts, in which the range of the MgO content was from 1 wt% to 7 wt%, were prepared, and their catalytic performances for the reaction of combined steam and carbon dioxide reforming of methane were investigated in a continuous flow microreactor. The structures of the catalysts were characterized using the XRD, H2-TPR and CO2-TPD techniques. The results indicated that the CO selectivity for this reaction was very close to 100%, and the H2/CO ratio of the product gas could be controlled by changing the H2O/CO2 molar ratio of the feed gas. The simultaneous and plentiful existing of steam and CO2 had a significant influence on the catalytic performance of the 10%Ni/SBA-15 catalyst without modification. After reacting at 850 °C for 120 h over this catalyst, the CH4 conversion dropped from 98% to 85%, and the CO2 conversion decreased from 86% to 53%. However, the 10%Ni/3%MgO/SBA-15 catalyst exhibited a much better catalytic performance, and after reacting for 620 h, the CO2 conversion over this catalyst dropped from 92% to around 77%, while the CH4 conversion was not decreased. Oxidation of the Ni0 species as well as carbon deposition during the reaction were the main reasons for the deactivation of the catalyst without modification. On the other hand, modification by the MgO promoter improved the dispersion of the Ni0 species, and enhanced the CO2 adsorption affinity which in turn depressed the occurring of carbon deposition, and thus retarded the deactivation process.

关键词： MgO promoter Ni-based catalyst SBA-15 methane combined steam carbon dioxide reforming synthesis gas

Magnetically recyclable Pd/γ-AlOOH@Fe_3O_4 catalysts and their catalytic performance for the Heck coupling reaction

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2014年第6期57卷 866-872页

作者： YANG Hao ji shengfu LIU XueFei ZHANG DanNi SHI Da State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

Novel magnetically recyclable Pd/γ-AlOOH@Fe3O4 catalysts were prepared using γ-AlOOH@Fe3O4 as a magnetic supporter and nano-Pd particles as the active catalytic *** structure of the catalysts was characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),N2 adsorption-desorption,and a vibration sample magnetometer(VSM).The catalytic activity and recyclability for the Heck coupling reaction were *** showed that the magnetic γ-AlOOH@Fe3O4 possessed a core-shell structure,as well as that the nano-Pd particles were 6–8 nm and had been well dispersed in the γ-AlOOH *** the Heck coupling reactions,the magnetic Pd/γ-AlOOH@Fe3O4 catalysts exhibited good catalytic activity and *** the(0.021 mol%)Pd/γ-AlOOH@Fe3O4 catalyst,the bromobenzene conversion and product yield reached about 100%and 96.3%,respectively,under a 120°C reaction temperature and 12 h reaction *** being recycled 8 times,the conversion of bromobenzene and the recovery of the catalyst were about 90%and 93%,*** nano-Pd particles were kept well dispersed in the used Pd/γ-AlOOH@Fe3O4 catalyst.

关键词： magnetic Pd/γ-AlOOH@Fe3O4 Heck reaction recyclable