检索结果-南通市图书馆

Boosting low-temperature selective catalytic reduction of NO_(x)with NH_(3)of V_(2)O_(5)/TiO_(2)catalyst via B-doping

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第4期35卷 377-383页

作者： Hanghang Li Wei Zhao Licheng Wu Qian Wang Danhong Shang Qin Zhong School of Energy&Power Engineering Jiangsu UniversityZhenjiang 212013China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094China

A series of B-doped V_(2)O_(5)/TiO_(2) catalysts has been prepared the by sol-gel and impregnation methods to investigate the influence of B-doping on the selective catalytic reduction(SCR)of NOxwith NH_(3).X-ray diffraction,Brunauer-Emmett-Teller specific surface area,scanning electron microscope,X-ray photoelectron spectroscopy,temperature-programmed reduction of H_(2) and temperature-programmed desorption of NH_(3)technology were used to study the effect of the B-doping on the structure and NH_(3)-SCR activity of V_(2)O_(5)/TiO_(2) *** experimental results demonstrated that the introduction of B not only improved the low-temperature SCR activity of the catalysts,but also broadened the activity temperature *** best SCR activity in the entire test temperature range is obtained for VTiB_(2.0) with 2.0%doping amount of B and the NO_(x) conversion rate is up to 94.3%at 210℃.The crystal phase,specific surface area,valence state reducibility and surface acidity of the active components for the as-prepared catalysts are significantly affected by the B-doping,resulting in an improved NH_(3)-SCR *** results suggest that the V_(2)O_(5)/TiO_(2) catalysts with an appropriate B content afford good candidates for SCR in the low temperature window.

关键词： B-doping catalyst SCR NO_(x) Support

Metal-organic framework-derived Co-C catalyst for the selective hydrogenation of cinnamaldehyde to cinnamic alcohol

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2023年第10期62卷 46-56页

作者： Fuping Tian Xinchi Zhang Yingying Sheng Xiao Chen Xiang Wang Changhai Liang State Key Laboratory of Fine Chemicals&Department of Chemistry Dalian University of TechnologyDalian 116024China School of Chemical Engineering Dalian University of TechnologyDalian 116024China

The liquid phase selective hydrogenation of cinnamaldehyde has been investigated over the catalysts Co-C-T(T=400-700℃),which were derived from the carbonization of the MOF precursor Co-BTC at different temperatures in inert ***-C-500 exhibited a higher conversion(85.3%)than those carbonized at other temperatures,with 51.5%selectivity to cinnamyl alcohol,under a mild condition(90℃,4 h,2 MPa H_(2),solvent:9 ml ethanol and 1 ml water).The high catalytic activity of Co-C-500 can be ascribed to the large specific surface area of the catalyst,the uniformly dispersed metallic cobalt nanoparticles,and the more defect sites on the carbon ***,Co-C-500 showed excellent reusability in 5 successive cycles,mainly related to the uniformly dispersed cobalt nanoparticles embedded in carbon support.

关键词： catalyst Hydrogenation Selectivity Cinnamaldehyde Cinnamyl alcohol Co-C

Mechanistic aspects of facet-dependent CH_(4)/C_(2+)selectivity over aχ-Fe_(5)C_(2)Fischer-Tropsch catalyst

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2022年第3期7卷 449-456页

作者： Thanh Hai Pham Junbo Cao Nan Song Yueqiang Cao Bingxu Chen Gang Qian Xinggui Zhou De Chen Xuezhi Duan State Key Laboratory of Chemical Engineering East China University of Science and Technology130 Meilong RoadShanghai200237China Vietnam Institute for Tropical Technology and Environmental Protection 57A Truong Quoc DungHo Chi MinhViet Nam Department of Chemical Engineering Norwegian University of Science and TechnologyN-7491TrondheimNorway

Structure-performance relationship is a complex issue in iron-catalyzed Fischer-Tropsch synthesis,and it is not easy to elucidate it by experimental ***-principle calculation is a powerful method for explaining experimental results and guiding catalyst *** this study,we investigated the reaction mechanisms of CH_(4)formation and C-C coupling on fourχ-Fe_(5)C_(2)surfaces and established the kinetic equations to compare the rates of CH_(4)formation and C_(1)+C_(1)coupling reactions and determine the CH_(4)/C_(2+)*** results show that the geometry of theχ-Fe_(5)C_(2)surfaces has little effect on the formation rate of CH_(4);however,the C_(1)+C_(1)coupling reactions are significantly affected by the surface *** C_(1)+C_(1)coupling reaction rates on the terraced-like(510)and(021)surfaces are much higher than those on the stepped-like(001)and(100)*** on these results,we established a Brùnsted-Evans-Polanyi(BEP)relationship between the effective barrier difference for CH_(4)formation and C_(1)+C_(1)coupling(ΔE_(eff))and the adsorption energy of C+4H(ΔE_(C+4H))onχ-Fe_(5)C_(2)surfaces.ΔE_(C+4H)can be used as a descriptor for CH_(4)/C_(2+)selectivity on different surfaces ofχ-Fe_(5)C_(2).

关键词： selectivity catalyst coupling

Facile synthesis of metal-organic frameworks embedded in interconnected macroporous polymer as a dual acid-base bifunctional catalyst for efficient conversion of cellulose to 5-hydroxymethylfurfural

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第4期35卷 169-181页

作者： Yanan Wei Yunlei Zhang Bing Li Wen Guan Changhao Yan Xin Li Yongsheng Yan Institute of Green Chemistry and Chemical Technology School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang 212000China Research Center of Fluid Machinery Engineering and Technology Jiangsu UniversityZhenjiang 212000China

5-Hydroxymethylfurfural(5-HMF),as a key platform compound for the conversion of biomass to various biomass-derived chemicals and biofuels,has been attracted extensive *** this research,using Pickering high internal phase emulsions(Pickering HIPEs)as template and functional metal-organic frameworks(MOFs,UiO-66-SO;H and UiO-66-NH;)/Tween 85 as co-stabilizers to synthesis the dual acid-base bifunctional macroporous polymer catalyst by one-pot process,which has excellent catalytic activity in the cascade reaction of converting cellulose to *** effects of the emulsion parameters including the amount of surfactant(ranging from 0.5%to 2.0%(mass)),the internal phase volume fraction(ranging from 75%to 90%)and the acid/base Pickering particles mass ratio(ranging from 0:6 to 6:0)on the morphology and catalytic performance of solid catalyst were systematically *** results of catalytic experiments suggested that the connected large pore size of catalyst can effectively improve the cellulose conversion,and the synergistic effect of acid and base active sites can effectively improve the 5-HMF *** highest 5-HMF yield,about 40.5%,can be obtained by using polymer/MOFs composite as catalyst(Poly-P12,the pore size of(53.3±11.3)μm,the acid density of 1.99 mmol·g^(-1)and the base density of 1.13 mol·g^(-1))under the optimal reaction conditions(130℃,3 h).Herein,the polymer/MOFs composite with open-cell structure was prepared by the Pickering HIPEs templating method,which provided a favorable experimental basis and theoretical reference for achieving efficient production of high addedvalue product from abundant biomass.

关键词： catalyst Biomass Hydrolysis 5-Hydroxymethylfurfural Pickering high internal phase emulsions templated polymer Acid-base bifunctional site

Catalytic ozonation of NH_(4)^(+)-N in wastewater over composite metal oxide catalyst

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2022年第1期40卷 73-84页

作者： Caiqing He Yunnen Chen Lin Guo Ruoyu Yin Tingsheng Qiu Jiangxi Key Laboratory of Mining&Metallurgy Environmental Pollution Control Jiangxi University of Science and TechnologyGanzhou 341000China

Large amounts of water containing-ammonium nitrogen(NH_(4)^(+)-N)have attracted increasing *** ozonation technology,involving the generation of hydroxyl radical(OH)with strong oxidation ability,was originally utilized to degrade organic-containing *** this paper,Ce/MnOx composite metal oxide catalysts prepared with different preparation conditions were used to degrade wastewater containing inorganic pollutant(NH_(4)^(+)-N).The as-prepared catalyst features were characterized using X-ray diffraction(XRD),Brunauer-Emmett-Teller method(BET),scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDS),Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS)and H_(2)-temperature programmed reduction(H_(2)-TPR)*** results show that the catalyst,prepared by conditions with precipitant Na_(2)CO_(3) and Ce/Mn molar ratio 1:2 calcined at 400℃for 3 h in pH 11.0,displays the optimal performance,with the removal rate of NH_(4)^(+)-N and selectivity to gaseous nitrogen,88.14 wt%and 53.67 wt%,*** effects of several operating factors including solution pH,initial NH_(4)^(+)-N concentrations and scavengers were *** addition,XRD patterns of catalyst with the best performance and the comparative study on decontamination of NH_(4)^(+)-N by various processes(O_(3),catalyst and catalyst/O_(3))show that the primary metal oxides are CeO_(2) and MnO_(2) in Ce/MnOx composite metal oxide catalysts,which have a synergistic effect on the catalytic ozonation of NH_(4)^(+)-N,and the new phase MnO_(2) plays a great *** 5 consecutive use cycles,the degradation efficiency is declined slightly,and can still achieve better than 70 wt%over 1 h ***,the application of catalytic ozonation for actual wastewater on the removal rate of NH_(4)^(+)-N was *** mechanism and degradation pathway of NH_(4)^(+)-N were also *** a word,the application of CeO_(2)-MnO_(2

关键词： Ammonium nitrogen catalyst Wastewater Catalytic ozonation Rare earths

Micro-sized hydrothermal carbon supporting metal oxide nanoparticles as efficient catalyst for mono-dehydration of sugar alcohol

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2022年第5期16卷 822-839页

作者： Cheng PAN Chao FAN Wanqin WANG Teng LONG Benhua HUANG Donghua ZHANG Peigen SU Aqun ZHENG Yang SUN Department of Applied Chemistry School of ScienceXi’an Jiaotong UniversityXi’an 710049China Department of Material Chemistry School of ScienceXi’an Jiaotong UniversityXi’an 710049China School of Material Science and Engineering Xi’an University of Science and TechnologyXi’an 710600China School of Materials&Chemical Engineering Xi’an Technological UniversityXi’an 710021China

Most known catalytic dehydration of sugar alcohols such as D-sorbitol and D-mannitol can only produce di-dehydrated forms as major product,but monodehydrated products are also useful ***,both di-and mono-dehydration demand a high temperature(150℃ or higher),which deserves further *** improve the mono-dehydration efficiency,a series of metal-containing hydrothermal carbonaceous materials(HTC)are prepared as catalyst in this *** reveals that the composition of preparative solution has a key influence on the morphology of *** transformation of D-sorbitol,all HTC catalysts show low conversions in water regardless of temperature,but much better outputs are obtained in ethanol,especially at a higher *** D-mannitol is selected as substrate,moderate to high conversions are obtained in both water and *** the other hand,high mono-dehydration selectivity is obtained for both sugar alcohols by using all *** origin of mono-dehydration selectivity and role of carbon component in catalysis are discussed in association with *** study provides an efficient,mild,eco-friendly,and cost-effective system for mono-dehydration of sugar alcohols,which means a lot to development in new detergents or other fine chemicals.

关键词： hydrothermal carbon morphology catalyst mono-dehydration sugar alcohol

Boosting the hydrogen storage performance of magnesium hydride with metal organic framework-derived Cobalt@Nickel oxide bimetallic catalyst

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第12期52卷 161-171页

作者： Yan Zhang Jiaguang Zheng Zhiyu Lu Mengchen Song Jiahuan He Fuying Wu Liuting Zhang School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China Analysis and Testing Center Jiangsu University of Science and TechnologyZhenjiang 212003China State Key Laboratory of Silicon Materials Department of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

In this study,a MOF-derived bimetallic Co@NiO catalyst was synthesized and doped into MgH_(2)to improve the hydrogen desorption and resorption *** Co@NiO catalyst decreased the onset dehydrogenation temperature of MgH_(2)by 160℃,compared with un-doped MgH_(2).The MgH^(2+)9%(mass)Co@NiO composite released 6.6%(mass)hydrogen in 350 s at 315℃and uptook 5.4%(mass)hydrogen in500 s at 165℃,showing greatly accelerated de/rehydrogenation ***,the desorption activation energy of MgH^(2+)9%(mass)Co@NiO was decreased to(93.8±8.4)kJ·mol^(-1).Noteworthy,symbiotic Mg_(2)NiH_(4)/Mg_(2)CoH_(5)clusters were in-situ formed from bimetallic precursors and inlaid on MgH_(2)surface,which are considered as"multi-step hydrogen pumps",and provides surface pathways for hydrogen ***,the introduced Mg_(2)NiH_(4)/Mg_(2)CoH_(5)interfaces could provide numerous low energy barrier H diffusion channels,therefore accelerating the hydrogen release and *** research proposes new insights to design high-efficiency bimetallic catalyst for MgH_(2)hydrogen storage.

关键词： Hydrogen Absorption catalyst MgH_(2) Bimetallic materials Synergistic effect

Ultra-stable Cu-based catalyst for dimethyl oxalate hydrogenation to ethylene glycol

在线全文

学校读者我要写书评

暂无评论

中国化学工程学报:英文版 2023年第8期60卷 186-193页

作者： Peipei Ai Huiqing Jin Jie Li Xiaodong Wang Wei Huang State Key Laboratory of Clean and Efficient Coal Utilization College of Chemical Engineering and TechnologyTaiyuan University of TechnologyTaiyuan 030024China CAS Key Laboratory of Nanophotonic Materials and Devices&Key Laboratory of Nanodevices and Applications i-LabSuzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123China

Dimethyl oxalate(DMO) hydrogenation is a crucial step in the coal to ethylene glycol(CTEG) ***, Cu catalyst supported on fibrous mesoporous silica(Cu/FMS) was synthesized via liquid phase deposition technique and applied for the DMO hydrogenation to EG. The catalyst exhibited a remarkable EG selectivity of 96.95% and maintained its activity without deactivation for 1000 h. Fibers of FMS support and liquid phase deposition technology cooperated to give high dispersion of Cu species in the Cu/FMS catalyst, resulting in a high Cu surface area. The formation of Si—O—Cu during catalyst preparation process increased the Cu^(+)/(Cu^(0)+ Cu^(+)) ratio and enhanced the thermal and valence stability of Cu *** high Cu^(+) surface area and Cu stability(thermal and valence stability) of the Cu/FMS catalyst were key factors for achieving superior EG selectivity and ultra-high stability.

关键词： Stability Cu^(+)surface area Fibrous mesoporous silica catalyst Hydrogenation

Styrene epoxidation catalyzed by polyoxometalate/quaternary ammonium phase transfer catalysts: The effect of cation size and catalyst deactivation mechanism

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2023年第3期55卷 192-201页

作者： Qiongna Xiao Yuyan Jiang Weiqiang Yuan Jingjing Chen Haohong Li Huidong Zheng College of Chemical Engineering Fuzhou UniversityFuzhou 350116China Qingyuan Innovation Laboratory Quanzhou 362801China Engineering Research Center of Advanced Manufacturing Technology for Fine Chemicals Fujian Province UniversityFuzhou UniversityFuzhou 350116China College of Chemistry Fuzhou UniversityFuzhou 350116China

Catalytic epoxidation of alkenes is an important type of organic reaction in chemical industry,and the deep insight into catalyst deactivation will help to develop new epoxidation *** this work,series of quaternary ammoniums bearing different cationic sizes,***+(methyltrioctylammonium,[(C_(8)H_(17))_(3)CH_(3)N]+),HTMA+(hexadecyltrimethylammonium,[(C_(16)H_(33))(CH_(3))_(3)N]+) and DMDOA+(dimethyldioctadecylammonium,[(C_(18)H_(37))_(2)(CH_(3))_(2)N]+) were incorporated with polyoxometalate (POM) anions to prepare phase transfer catalysts (PTCs),which were used in the styrene *** them,(MTOA)_(3)PW_(4)O_(24)exhibits the best catalytic performance judged from the highest styrene conversion rate(52%) and styrene oxide selectivity (93%),during which the styrene epoxidation conditions were ***,the deactivation mechanism of this kind of PTCs was proposed firstly,*** the case of low H_(2)O_(2) content,the oxidant can only be used in the styrene epoxidation,in which the catalyst can transform into stable Keggin-type *** when the content of H_(2)O_(2) is higher,the excess H_(2)O_(2) can reactivate the Keggin-type POM into active (PW_(4)O_(24))_(3)-anions,which can trigger the ring-opening polymerization of styrene ***,the catalyst is deactivated by adhered poly(styrene oxide)irreversibly,which was determined by NMR *** this situation,the active moiety{PO_(4)[WO(O_(2))_(2)]_(4)}_(3)-in phase-transfer catalytic system can break into some unidentified species with low W/P ratio with the presence of *** work will be beneficial for the design of new PTCs in alkene epoxidation in fine chemical industry.

关键词： Phosphotungstic acid phase-transfer catalyst Styrene epoxidation catalyst deactivation mechanism Cation size effect