检索结果-南通市图书馆

Multiple exciton generation effect in photocatalytic overall water splitting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第2期67卷 424-425页

作者： Xiaolei Guo Ji-Jun Zou Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China

This highlight is based on recent research published in Nature Energy by Li and co-workers [1] from Northwestern Polytechnology University, reporting an exceeding 100% internal quantum efficiency(IQE) in photocatalytic overall water splitting. This breakthrough promises a bright future for efficient photocatalyst design by utilizing the multiple exciton effect(MEG).

关键词： splitting effect utilizing

维普期刊数据库

Insight into the adsorption behavior and mechanism of trace impurities from H_(2)O_(2)solution on functionalized zirconia by tuning the structure of amino groups

在线全文

学校读者我要写书评

暂无评论

Frontiers of chemical Science and Engineering 2024年第5期18卷 83-94页

作者： Yu Meng Yitong Wang Guozhu Li Guozhu Liu Li Wang key laboratory for green chemical technology of ministry education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Haihe laboratory of Sustainable chemical Transformations Tianjin 300192China

Primary,secondary and tertiary amino-functionalized zirconia(ZrO_(2)-NH_(2),ZrO_(2)-NH and ZrO_(2)-N)was synthesized by the postgrafting method for the adsorption removal of typical metallic ions,phosphate and total oxidizable carbon from a real H_(2)O_(2)solution.ZrO_(2)-NH_(2),ZrO_(2)-NH and ZrO_(2)-N exhibited similar pore sizes and sequentially increased zeta potentials.The adsorption results of single and binary simulated solutions showed that the removal efficiency increased in the order of Fe^(3+)>Al^(3+)>Ca^(2+)>Na^(+).There is competitive adsorption between metallic ions,and Fe^(3+)has an advantage over the other metals,with a removal efficiency of 90.7%.The coexisting phosphate could promote the adsorption of metallic ions,while total oxidizable carbon had no effect on adsorption.The adsorption results of the real H_(2)O_(2)solution showed that ZrO_(2)-NH_(2)exhibited the best adsorption affinity for metallic ions,as did phosphate and total oxidizable carbon,with a total adsorption capacity of 120.9 mg·g_(-1).Density functional theory calculations revealed that the adsorption process of metallic ions involves electron transfer from N atoms to metals and the formation of N-metal bonds.

关键词： adsorption metallic ion phosphate total oxidizable carbon zirconia H_(2)O_(2)

Combined effects of sea urchin-like structure and mixed Cu^(+)/Cu^(0)states on promoting C_(2)formation in electrocatalytic CO_(2)reduction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of chemical Science and Engineering 2024年第3期18卷 63-73页

作者： Mengqing Shan Dongsheng Lu Jiatong Dong Shen Yan Jinyu Han Hua Wang Collaborative Innovation Center of chemical Science and Engineering Key Laboratory for Green Chemical Technology of the Ministry of EducationSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin300354China

Surface engineering and Cu valence regulation are essential factors in improving the C_(2)selectivity during the electrochemical reduction of CO_(2).Herein,we present a sea urchin-like CuO/Cu_(2)O catalyst derived from rhombic dodecahedra Cu_(2)O through one-step oxidation/etching method where the mixed Cu^(+)/Cu^(0)states are formed via in situ reduction during electrocatalysis.The combined effects of the morphology and the mixed Cu^(+)/Cu^(0)states on C–C coupling are evaluated by the Faradaic efficiency of C_(2)and the C_(2)/C1 ratio obtained in an H-cell.R-Cu^(O)/Cu_(2)O exhibited 49.5%Faradaic efficiency of C_(2)with a C_(2)/C1 ratio of 3.1 at−1.4 V vs.reversible hydrogen electrode,which are 1.5 and 3.2 times higher than those of R-Cu_(2)O,respectively.Using a flow-cell,68.0%Faradaic efficiency of C_(2)is achieved at a current density of 500 mA·cm^(−2).The formation of the mixed Cu^(+)/Cu^(0)states was confirmed by in situ Raman spectra.Additionally,the sea urchin-like structure provides more active sites and enables faster electron transfer.As a result,the excellent C_(2)production on R-CuO/Cu_(2)O is primarily attributed to the synergistic effects of the sea urchin-like structure and the stable mixed Cu^(+)/Cu^(0)states.Therefore,this work presents an integrated strategy for developing Cu-based electrocatalysts for C_(2)production through electrochemical CO_(2)reduction.

关键词： CO_(2)electrolysis sea urchin-like structure Cu^(+)/Cu^(0) C_(2)products

Dielectric barrier micro-plasma reactor with segmented outer electrode for decomposition of pure CO_(2)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of chemical Science and Engineering 2021年第3期15卷 687-697页

作者： Baowei Wang Xiaoxi Wang Bo Zhang Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China key laboratory for green chemical Process of ministry of education School of Chemical Engineering and PharmacyWuhan Institute of TechnologyWuhan 430205China

Four coaxial cylinder dielectric barrier discharge micro-plasma reactors were designed for the noncatalytic decomposition of pure CO_(2) into CO and O_(2) at low temperature and ambient pressure.The influence of segmented outer electrodes on the electrical characteristics and the reaction performance was investigated.Experimental results indicated that the introduction of segmented outer electrodes can significantly promote the decomposition of CO_(2).Encouragingly,the highest conversion of 13.1% was obtained at an applied voltage of 18 kV,which was a substantial increase of 39.4% compared to the traditional device.Compared with other types of dielectric barrier discharge plasma reactors,the proposed segmented outer electrode micro-plasma reactor can give a higher CO_(2) conversion and acceptable energy efficiency.The increase in conversion can be attributed mainly to the enhanced corona discharge caused by the fringe effect at electrode edges,the increase in energy density and the increase in the number of micro-discharges.In addition,detailed electrical characterization was performed to reveal some trends in the electrical behavior of proposed reactors.

关键词： CO_(2)decomposition dielectric barrier discharge segmented outer electrodes electrical analysis reactor design

Enabling Mg metal anodes rechargeable in conventional electrolytes by fast ionic transport interphase

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2020年第2期7卷 333-341页

作者： Ruijing Lv Xuze Guan Jiahua Zhang Yongyao Xia Jiayan Luo Key Laboratory for Green Chemical Technology of Ministry of Education State Key Laboratory of Chemical Engineering School of Chemical Engineering and Technology Tianjin University Department of Chemistry Fudan University

Rechargeable magnesium batteries have received extensive attention as the Mg anodes possess twice the volumetric capacity of their lithium counterparts and are dendrite-free. However, Mg anodes suffer from surface passivation film in most glyme-based conventional electrolytes, leading to irreversible plating/stripping behavior of Mg. Here we report a facile and safe method to obtain a modified Mg metal anode with a Sn-based artificial layer via ion-exchange and alloying reactions. In the artificial coating layer, Mg2Sn alloy composites offer a channel for fast ion transport and insulating MgCl2/SnCl2bestows the necessary potential gradient to prevent deposition on the surface. Significant improved ion conductivity of the solid electrolyte interfaces and decreased overpotential of Mg symmetric cells in Mg(TFSI)2/DME electrolyte are obtained. The coated Mg anodes can sustain a stable plating/stripping process over 4000 cycles at a high current density of 6 mA cm-2. This finding provides an avenue to facilitate fast ion diffusion kinetics of Mg metal anodes in conventional electrolytes.

关键词： fast ion transport interphase artificial layer Mg metal anodes conventional electrolytes

Reconstruction of Cu-ZnO catalyst by organic acid and deactivation mechanism in liquid-phase hydrogenation of dimethyl succinate to 1,4-butanediol

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

化学科学与工程前沿:英文版 2023年第9期17卷 1311-1319页

作者： Fan Sun Huijiang Huang Wei Liu Lu Wang Yan Xu Yujun Zhao Key Laboratory for Green Chemical Technology of Ministry of Education Collaborative Innovation Center of Chemical Science and EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China

A reconstructed Cu-ZnO catalyst with improved stability was fabricated by organic acid treatment method for the liquid-phase hydrogenation of dimethyl succinate to 1,4-butanediol.According to the characterization results of the fresh Cu-ZnO and reconstructed Cu-ZnO,three different forms of ZnO were suggested to be presented on the catalysts:ZnO having strong interaction with Cu species,ZnO that weakly interacted with Cu species and isolated ZnO.The first form of ZnO was believed to be beneficial to the formation of efficient active site Cu^(+),while the latter two forms of ZnO took the main responsibility for the deactivation of Cu-ZnO catalysts in the liquid-phase hydrogenation of diesters.The reconstruction of the Cu-ZnO catalyst by the organic acid treatment method resulted in a new Cu-ZnO catalyst with more Cu^(+)and less ZnO species that leads to deactivation.Furthermore,the deactivation mechanism of Cu-ZnO catalysts in liquid-phase diester hydrogenation in continuous flow system was proposed:the deposition of the polyesters on the catalysts via transesterification catalyzed by weakly interacted ZnO and isolated ZnO leads to the deactivation.These results provided meaningful instructions for designing highly efficient Cu-Zn catalysts for similar ester hydrogenation systems.

关键词： liquid phase hydgonenation Cu-ZnO deactivation mechanism 1,4-butanediol diester

Effect of boron addition on the MoO_3/CeO_2–Al_2O_3 catalyst in the sulfur-resistant methanation

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 2018年第3期26卷 509-513页

作者： Baowei Wang Wenxia Yu Weihan Wang Zhenhua Li Yan Xu Xinbin Ma key laboratory for green chemical technology of the ministry of education School of Chemical Engineering and Technology Tianjin University

The effect of boron on the performance of MoO_3/CeO_2–Al_2O_3 catalysts, which were prepared with impregnation method, was investigated. The catalysts were characterized with N_2 adsorption–desorption, XRD, H_2-TPR, and NH_3-TPD, and were tested in sulfur-resistant methanation. The results indicated that the MoO_3/CeO_2–Al_2O_3 catalysts modified by boron showed higher catalytic performance in sulfur-resistant methanation. The CO conversion increased from 47% to 62% with 0.5 wt% boron content. When the content of boron was under 0.5 wt%, the results suggested there was an increase in the amorphous form of MoO_3 caused by the generation of weak and intermediate acid sites, which had weakened the interaction between the active components and supports. While, the catalyst added 2.0 wt% boron showed the strong acid sites and the largest crystalline size resulting in the uneven distribution of ceria.

关键词：催化剂 NH3-TPD 硼解吸附作用硫 MoO3 相互作用 XRD

维普期刊数据库

Importance of metal location in M-H zeolite for synergistically catalyzing dimethyl ether carbonylation

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1期35卷 350-357页

作者： Shiyue Li Shouying Huang Kai Cai Ying Li Jing Lv Xinbin Ma Key Laboratory for Green Chemical Technology of Ministry of Education Collaborative Innovation Center of Chemical Science and EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China

Mordenite(MOR)has shown great potential to catalyze dimethyl ether(DME)carbonylation to methyl acetate(MA)in industry.The synergy between metal species and Brønsted acid sites accelerates DME conversion.Here we designed and prepared two catalysts with different Ag locations by seed-directed growth method and two-step impregnation method(named as Ag@HMOR and Ag/HMOR-out,respectively),to explain the effect of Ag location on catalytic performance.The results of TEM,XPS,CO-IR and UV–Vis showed that Ag species mainly presented as Ag^(0) species over both Ag@HMOR and Ag/HMOR-out.Meanwhile,Ag^(0) species mainly located in the micropores of Ag@HMOR,while as for Ag/HMOR-out,Ag^(0) mainly existed on external surface.After comparing the performance of the catalysts with different Ag positions,we confirmed that the Ag^(0) species encapsulated in the channels of HMOR promoted the DME carbonylation,which revealed the importance of spatial adjacency on the acid-metal catalysts.

关键词： Dimethyl ether Carbonylation Silver modification Metal location

维普期刊数据库

Robust Ruddlesden-Popper phase Sr_(3)Fe_(1.3)Mo_(0.5)Ni_(0.2)O_(7-δ)decorated with in-situ exsolved Ni nanoparticles as an efficient anode for hydrocarbon fueled solid oxide fuel cells

在线全文

学校读者我要写书评

暂无评论

SusMat 2022年第4期2卷 487-501页

作者： Xiaoyu Zhang Yawen Tong Tong Liu Dong Zhang Na Yu Jian Zhou Yueqin Li Xiang-Kui Gu Yao Wang key laboratory of Hydraulic Machinery Transients(Wuhan University) Ministry of EducationSchool of Power and Mechanical EngineeringWuhan UniversityWuhanHubeiChina key laboratory of green chemical Process of ministry of education Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei ProvinceSchool of Chemical Engineering and PharmacyWuhan Institute of TechnologyWuhanChina

A highly efficient Ruddlesden-Popper structure anode material with a formula of Sr_(3)Fe_(1.3)Mo_(0.5)Ni_(0.2)O_(7-δ)(RP-SFMN)has been developed for hydrocarbon fueled solid oxide fuel cells(HF-SOFC)application.It is demonstrated that a nanostructured RP-SFMN anode decorated with in-situ exsolved Ni nanoparticles(Ni@RP-SFMN)has been successfully prepared by annealing the anode in reducing atmosphere similar to the operating conditions.The phase compositions,valence states,morphologies,and electrocatalytic activities of RP-SFMN material have been characterized in detail.In addition,the in-situ exsolution mechanism of the metallic Ni phase from the parent oxide is clearly explained by using density function theory calculation.The peak output power density at 800℃ is significantly enhanced from 0.163 to 0.409 W/cm^(2)while the electrode polarization resistance is effectively lowered from 0.96 to 0.30Ωcm^(2)by the substitution of B-site Fe by Ni,which is attributed to the improved electrocatalytic activities induced by the in-situ exsolved Ni nanocatalysts.Moreover,the single cell with RP-SFMN anode exhibits good stability in 3%H_(2)O humidified H_(2)and syngas for 110 and 60 h at 800℃,respectively.Our findings indicate that RP-SFMN is a greatly promising anode candidate of HF-SOFCs due to its good electrochemical performance and stability during the operation.

关键词： density function theory in-situ exsolution nanostructured anode Ruddlesden-Popper oxide solid oxide fuel cells