检索结果-南通市图书馆

Chinese Chemical Letters 2024年第4期35卷 17-30页

作者： Li Li fanpeng chen Bohang Zhao Yifu Yu Department of Chemistry School of ScienceInstitute of Molecular PlusTianjin UniversityTianjin 300072China

Converting CO_(2) into value-added chemicals and fuels through various catalytic methods to lower the atmospheric CO_(2) concentration has been developed to be a crucial means to alleviate the energy shortage and ameliorate the ever-fragile environment status. However, the complexity of the CO_(2) conversion reaction and the strong reduction conditions lead to the inevitable structural evolution, making it difficult for the prior design of suitable catalytic materials. Herein, to guide the rational design of efficient catalysts,we will be centered on the thermal, electro, and photo-induced structural evolution and active species identification during the CO_(2) conversion, including the in situ/operando characterization techniques monitoring the activation, steady, and deactivation stage of the catalysts as well as the inherent restructuring mechanism towards active species. Besides, the future challenges and opportunities on the merits of combining the structural evolution with the adsorbed intermediates recognized by ultra-fast spectroscopic techniques, simultaneously, the combination of theoretical simulation and the results of in situ experiments will also be addressed. This review can not only guide the identification of real active species, but also provide an approach to design the specific active species towards CO_(2) conversion, rather than only focusing on activity, for the purpose of practical industrial application.

关键词： CO_(2) Structural evolution Active species In situ Operando

Enhanced Ethylene Production from Electrocatalytic Acetylene Semi-hydrogenation Over Porous Carbon-Supported Cu Nanoparticles

在线全文

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2024年第4期30卷 297-304页

作者： Li Li fanpeng chen Bo-Hang Zhao Yifu Yu Institute of Molecular Plus Department of ChemistrySchool of ScienceTianjin UniversityTianjin 300072China

Electrocatalytic semi-hydrogenation of acetylene(C_(2)H_(2))over copper nanoparticles(Cu NPs)offers a promising non-petroleum alternative for the green production of ethylene(C2H4).However,server hydrogen evolution reaction(HER)competition in this process prominently decreases C2H4 selectivity,thereby hindering its practical ***,a Cu-based composite catalyst,wherein porous carbon with nanoscale pores was used as a support,is constructed to gather the C_(2)H_(2) feedstocks for suppressing the undesirable *** a result,the as-prepared catalyst exhibited C_(2)H_(2) conversion of 27.1%and C_(2)H_(4) selectivity of 88.4%at a C2H4 partial current density of 0.25 A/cm^(2) under optimal−1.0 V versus reversible hydrogen electrode(RHE)under the simulated coal-derived C_(2)H_(2) atmosphere,significantly outperforming the single Cu NPs *** addition,a series of in situ and ex situ experimental results show that not only the porous nature of the carbon support but also the stabilized Cu^(0)–Cu^(+) dual active sites through the strong metal–support interactions enhance the adsorption capacity of C_(2)H_(2),leading to high C_(2)H_(2) partial pressure,restraining the HER and thus improving the C2H4 selectivity.

关键词： Electrocatalysis Cu-based catalyst Hydrogenation Ethylene Selectivity

Mechanistic insight into the controlled synthesis of metal phosphide catalysts from annealing of metal oxides with sodium hypophosphite

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第12期15卷 10134-10141页

作者： fanpeng chen Bohang Zhao Mengyao Sun Cuibo Liu Yanmei Shi Yifu Yu Bin Zhang Department of Chemistry School of ScienceInstitute of Molecular PlusTianjin UniversityTianjin300072China Collaborative Innovation Center of Chemical Science and Engineering Tianjin UniversityTianjin300072China

Understanding and manipulating synthetic progress for precisely controlling the components and defects of nanomaterials is an important and challenging task in materials synthesis and *** phosphides(MPs)have been explored as cheap advanced materials in various catalytic *** materials are usually synthesized through gas-solid phosphorization reaction in a trial-to-error manner,but their formation mechanism and the origin of controlled synthesis remain ***,we combine in situ thermogravimetrc analysis-mass spectrometry(TG-MS)and quasi-in situ X-ray powder diffraction(XRD)analysis to probe the transformation mechanism from metal oxides(MOs)to MPs during the phosphorization process mediated by ***,time,and the amount of hypophosphite are revealed as the driven forces while oxophilicity and crystallinity as the impeded forces,simultaneously control the component and defect level of a series of MP(M=Ni,Co,W,Mo,and Nb).The as-obtained WO2.9/WP is proved to be an efficient Z-scheme photocatalyst for oxidative coupling of methane with the total C2+production and C2H4 selectivity in C2+products reaching 10.75 pmolg-1 and 98.25%.Our work provides a fundamental understanding of the phosphorization treatment and thereby guides a viable synthetic route to the controlled synthesis of MOx-δ,MP,MOx-δ/MP,and MP/M heterostructured materials.

关键词： phosphorization treatment metal phosphides methodology heterostructure oxygen vacancy photocatalysis

Promoting nitric oxide electroreduction to ammonia over electron-rich Cu modulated by Ru doping

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

Science China Chemistry 2021年第9期64卷 1493-1497页

作者： Jiangwei Shi Changhong Wang Rong Yang fanpeng chen Nannan Meng Yifu Yu Bin Zhang Department of Catalysis Science and Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China Institute of Molecular Plus School of ScienceTianjin UniversityTianjin300072China

Electrocatalytic nitric oxide(NO)reduction is a promising strategy to produce *** a facile approach to synthesize efficient catalysts with enhanced NO electroreduction performance is highly ***,a series of Ru-doped Cu materials are constructed through in situ electroreduction of corresponding metal *** optimized Ru_(0.05)Cu_(0.95)exhibits superior electrocatalytic performance for ammonia synthesis by using NO/Ar(1/4,n/n)as the feedstocks(Faradaic efficiency:64.9%,yield rate:17.68μmol cm^(-2)h^(-1)),obviously outperforming Cu counterpart(Faradaic efficiency:33.0%,yield rate:5.73μmol cm^(-2)h^(-1)).Electrochemical in situ Fourier transform infrared(FTIR)spectroscopy and online differential electrochemical mass spectrometry(DEMS)are adopted to detect intermediates and unveil the possible reaction *** downshift of the Cu d-band center induced by Ru doping facilitates the rate-limiting hydrogenation step and decreases the desorption energy of NH_(3),leading to high Faradaic efficiency and yield of ammonia.

关键词： Electrocatalysis NO ammonia synthesis in situ characterizations Ru-doped Cu

在线全文

学校读者我要写书评

暂无评论

电磁场辅助的低温合成氨

Science Bulletin 2023年第17期68卷 1871-1874页

作者：张宝顺王雨婷张娜朱杰伟籍王阳陈凡芃陈星于一夫张兵 Department of Chemistry Institute of Molecular PlusSchool of ScienceTianjin UniversityTianjin 300072China Department of Catalysis Science and Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

近年来,超越传统的氮肥用途,氨越来越多地被认为是一种高密度储能载体和零碳清洁燃料.然而,传统哈伯法合成氨的严苛操作条件极大地限制了氨作为储能载体和燃料的发展.低温下实现氮气高效活化是解决上述问题的关键.本文开发了一种电磁场... 详细信息

近年来,超越传统的氮肥用途,氨越来越多地被认为是一种高密度储能载体和零碳清洁燃料.然而,传统哈伯法合成氨的严苛操作条件极大地限制了氨作为储能载体和燃料的发展.低温下实现氮气高效活化是解决上述问题的关键.本文开发了一种电磁场辅助热催化合成氨新方法.作者采用廉价的商业铁基催化剂作为模型材料,向催化剂床层引入高频、高电压电磁场,使氮气分子的偶极矩和铁基催化剂的电子结构得以被实时调控,进而提高氮气分子在催化剂表面的吸附强度,从而在低温下实现氮气的高效活化.当电磁场存在时,合成氨反应起始温度为100℃,明显低于传统热催化合成氨反应的起始温度(300℃).在填充80 g商业铁基催化剂的放大实验中,相比传统方法,电磁场辅助热催化方法的氨收率提升了5倍、能耗降低了2.7倍.

关键词：铁基催化剂催化剂床层合成氨放大实验起始温度电磁场模型材料偶极矩

三黄泻心汤联合西药治疗脓毒症急性肾损伤(?三焦热盛?)随机平行对照研究

在线全文

学校读者我要写书评

暂无评论

实用中医内科杂志 2018年第6期32卷 31-34页

作者：黄建略曾凡鹏黄石标陈冬莲清远市中医院广东清远511500

[目的]观察三黄泻心汤联合西药治疗脓毒症急性肾损伤(三焦热盛)疗效。[方法]使用随机平行对照方法,将78例住院患者按病志号抽签方法随机分为两组。对照组40例液体复苏,维持有效血容量;低潮气量通气,6m L/kg;氢化可的松,20~40mg/d,肌注;... 详细信息

[目的]观察三黄泻心汤联合西药治疗脓毒症急性肾损伤(三焦热盛)疗效。[方法]使用随机平行对照方法,将78例住院患者按病志号抽签方法随机分为两组。对照组40例液体复苏,维持有效血容量;低潮气量通气,6m L/kg;氢化可的松,20~40mg/d,肌注;根据细菌培养结果给予抗生素,达到血液透析指征高通量血液透析,支持、对症治疗。治疗组38例三黄泻心汤(黄连6g,黄芩12g,大黄6g,甘草生12g,肉桂3g,乳香制、没药制各l0g,白及9g,大枣10g),150m L/次,2次/d,口服或鼻饲(昏迷或吞咽困难);西药治疗同对照组。连续治疗8d为1疗程。观测临床症状、急性生理学及慢性健康状况评分Ⅱ、中性粒细胞明胶酶相关脂质运载蛋白含量、尿肾损伤分子-1、血清半胱氨酸蛋白酶抑制剂C、IL-18、不良反应。治疗1疗程(8d),判定疗效。[结果]A-PACHEⅡ评分、NGAL、Kim-1、Cys C、IL-18两组均有改善(P<0.05,P<0.01),治疗组改善优于对照组(P<0.05,P<0.01)。[结论]三黄泻心汤联合西药治疗脓毒症急性肾损伤(三焦热盛),疗效满意,无严重不良反应,值得推广。

关键词：脓毒症急性肾损伤神昏三焦热盛三黄泻心汤液体复苏氢化可的松血液透析急性生理学及慢性健康状况评分Ⅱ 中性粒细胞明胶酶相关脂质运载蛋白含量尿肾损伤分子-1 血清半胱氨酸蛋白酶抑制剂C IL-18 中药复方随机平行对照研究

Uncovering the degradation mechanism induced by ion-diffusion kinetics in large-format lithium-ion pouch cells

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第8期83卷 98-105,I0005页

作者： Shi Zhou Xiaohong Zhang Cong chen Ming chen fanpeng Kong Yingjie Qiao Jiajun Wang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering University Harbin 150001HeilongjiangChina Chongqing Research Institute of Harbin Institute of Technology Chongqing 401135China

Battery electrochemistry in an actual cell is a complicated behavior influenced by the current density,uniformity,and ion-diffusion distance,*** anisotropism of the lithiation/delithiation degree is usually inevitable,and even worse,due to a trend of big-size cell design,typically such as 4680 and blade cells,which accelerated a battery failure during repeat lithiation and delithiation of *** by that,two big-size pouch cells with big sizes,herein,are selected to reveal the ion-diffusion dependency of the cathodes at different ***,we find that the LiCoO_(2) pouch cell exhibits ~5 A h loss after 120 charge-discharge cycles,but a 15 A h loss is verified in a LiNixMnyCO_(1-x)-yO_(2)(NCM) ***-based imaging analysis indicates that higher ion-diffusion rates in the LiCoO_(2)than that in the LiNixMnyCO_(1-x)-yO_(2)is the determined factor for the anisotropic cathode fading,which is responsible for a severe mechanical issue of particle damage,such as cracks and even pulverization,in the cathode ***,we verify the different locations at the near-tab and bottom of the electrode make it worse due to the ion-diffusion kinetics and temperature,inducing a spatially uneven electrochemistry in the big-size pouch *** findings give an in-depth insight into pouch cell failure and make a guideline for high-energy cell design and development.

关键词： Ah-level lithium-ion pouch cells Cathode materials lon-diffusion kinetics X-ray tomography

Wide pillar roadway retained in the deep high gas coal seam

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2012年第6期22卷 828-831页

作者： Pan Liyou Feng Enhu Zhao Qingshou chen Liqiang Kong fanpeng Institute of Mining Engineering Shandong University of Science and Technology Bao'an Mine Shanxi Coal Transportation and Sales Group Co.Ltd. College of Natural Resources and Environmental Engineering Shandong University of Science and Technology

According to the geological and mining conditions of deep high gas coal seam,this paper established the mechanical model of stope surrounding rock,and analyzed the stress distribution and deformation failure mechanism of working face and coal *** research determined the arrangement mode that adjacent working faces retain wide pillar,and the reasonable support method of roadway that the combined support of roof and grouting combined *** reasonable time of reinforced roadway was *** analyzing the mechanical model of the ways of roadway supporting,this research drew the conclusions as follows:the combined support of roof and working slope improved the support strength and range of surrounding rock,optimized the support by adjusting the angle of anchor,and reached the support requirements by using cement grouting in working slope and chemical grout in *** technology was applied in 15104 working face of Baoan Mine,and obtained good results.

关键词： Gas Roadway retained Wide pillar Stress distribution Combined support of roof and working slope Grouting

Phosphate imbalance conducting by BPs-based cancer-targeting phosphate anions carrier induces necrosis

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第4期32卷 1550-1554页

作者： Chunmeng Ma Jinlong Zhang Yuan Zhang chen Ma Minrui Ma fanpeng Ran Xiaoyan Liu Haixia Zhang College of Chemistry and Chemical Engineering.Lanzhou University Lanzhou 730000China

As a vital nutrient closely related to the cance r-cells proliferation,phosphate anions have been paid great attention as a promising anticancer ***,the transport of phosphate anions depends on a protein transport system which is regulated by ion homeostasis ***,we designed a reactive anionic nanocarrier based on black phosphorus nanosheets(BPs)and artesunate(ART),which could enter cells through endocytosis to generate phosphate anions,avoiding the regulation of cell *** ionic nanocarrier was coated by polydopamine to defend BPs and ART and functionalized by folate(FA)and hyaluronic acid(HA)for targeting *** the anchoring groups FA/HA targeted the carrier into cells,polydopamine coating decomposed to expose ART for further generating reactive oxygen species(ROS)in cancer cell microenvironment,providing oxidation ***,ROS generated by ART makes BPs decompose to phosphate anions with effectively speed,giving rise to the destruction of ion homeostasis to induce necro sis and inhibit the proliferation for cancer *** consequence,this research provides novel idea and direction for the ionic carriers and tumor therapeutics.

关键词： Phosphate anions carrier Black phosphorus nanosheets Artesunate Phosphate imbalance Necrosis

Treatment of Microalgae in Ballast Water Using Hydroxyl Radical in Accordance with the D-2 Ballast Water Discharge Standard

在线全文

学校读者我要写书评

暂无评论

高电压技术 2014年第1期40卷 232-236页

作者： MENG Xiangying chen Cao BAI Mindong SUN Jian MENG fanpeng Institute of Marine Engineering Department of PhysicsDalian Maritime University College of Environment and Ecology Xiamen University

The effect of hydroxyl radical(·OH) on microalgae in ballast water is experimentally investigated. An ?OH plasma generator, which has a thin plate discharge Ag electrode covered by two α-Al2 O3 dielectric layers, is built. The plasma generator is filled with O2 and gaseous H2 O and is powered by a homemade power supply. ?OH radicals are generated by a series of plasma reactions and then dissolved into ballast water to kill microalgae. The maximum density of the killed microalgae is about 11 000 cells per milliliter. At this density, the microalgae are not reactivated at the 48th hour and the 120th hour in the treated ballast waters, and the content of chlorophyll in these microalgae decreases by 100%. The water quality returns to a normal level after 120 hours without secondary pollution of aquatic organisms and environment. These results show that the requirements of the D-2 ballast water discharge standard defined by the International Maritime Organization(IMO) are satisfied with the proposed treatment, and that ·OH is an ideal substance for killing microalgae during ballast water replacement of ships.

关键词：压载水处理排放标准微藻羟自由基等离子体发生器国际海事组织俄亥俄州最大密度