检索结果-南通市图书馆

NO_(x) reduction against alkali poisoning over Ce(SO_(4))_(2)-V_(2)O_(5)/TiO_(2) catalysts by constructing the Ce^(4+)-SO_(4)^(2−)pair sites

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第5期35卷 355-360页

作者： Shuangxi Li Huijun Yu Tianwei Lan Liyi Shi Danhong Cheng Lupeng Han dengsong zhang State Key Laboratory of Advanced Special Steel School of Materials Science and EngineeringInternational Joint Laboratory of Catalytic ChemistryCollege of SciencesShanghai UniversityShanghai 200444China

Commercial V_(2)O_(5)-based catalysts have been successfully applied in NH_(3) selective catalytic reduction(NH_(3)-SCR)of NO_(x) from power stations,but their poor alkali-resistance restrains the wider application in nonelectrical *** this study,NO_(x) reduction against alkali poisoning over V_(2)O_(5)/TiO_(2) is greatly improved via Ce(SO_(4))_(2) *** has been originally demonstrated that Ce^(4+)-SO_(4)^(2−)pair sites play crucial roles in improving NO_(x) reduction against alkali poisoning over V_(2)O_(5)/TiO_(2) *** strong interaction between V species and Ce sites of Ce^(4+)-SO_(4)^(2−)pairs triggers the reaction between NH_(4)^(+) species and gaseous NO via Eley-Rideal(E-R)reaction *** K-poisoning,the SO_(4)^(2−)sites of Ce^(4+)-SO_(4)^(2−)pairs as protective sites strongly bond with K and thus maintain the high reaction efficiency via the E-R reaction *** work demonstrates an effective strategy to enhance NO_(x) reduction against alkali poisoning over catalysts via constructing Ce^(4+)-SO_(4)^(2−)pair sites,contributing to developing alkali-resistant SCR catalysts for practical application in nonelectrical industries.

关键词： Air pollution control Selective catalytic reduction NOx reduction Alkali poisoning Ce(SO_(4))_(2)

Hydrothermally stable metal oxide-zeolite composite catalysts for low-temperature NO_(x) reduction with improved N_(2) selectivity

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第6期35卷 515-523页

作者： Lijun Yan Shiqi Chen Penglu Wang Xiangyu Liu Lupeng Han Tingting Yan Yuejin Li dengsong zhang School of Environmental and Chemical Engineering International Joint Laboratory of Catalytic ChemistryCollege of SciencesShanghai UniversityShanghai 200444China BASF Environmental Catalyst and Metal Solutions IselinNJ 08830United States

Development of hydrothermally stable,low-temperature catalysts for controlling nitrogen oxides emissions from mobile sources remains an urgent *** have prepared a metal oxide-zeolite composite catalyst by depositing Mn active species on a mixture support of CeO_(2)/Al_(2)O_(3) and *** composite catalyst is hydrothermally stable and shows improved low-temperature SCR activity and significantly reduced N_(2)O formation than the corresponding metal oxide *** with a Cu-CHA catalyst,the composite catalyst has a faster response to NH_(3) injection and less NH_(3) *** characterization results reveal that such an oxide-zeolite composite catalyst contains more acidic sites and Mn^(3+)species as a result of oxide-zeolite interaction,and this interaction leads to the generation of more NH_(4)^(+)species bound to the Br?nsted acid sites and more reactive NOxspecies absorbed on the Mn ***,we report our mechanistic understanding of the oxide-zeolite composite catalyst and its molecular pathway for improving the low-temperature activity and N_(2) selectivity for NH_(3)-SCR ***,this work may provide an alternative methodology for low-temperature NO_(x) control from diesel vehicles.

关键词： Selective catalytic reduction Mn-based catalysts Hydrothermal stability N_(2) selectivity

Alkali-resistant NO_(x) reduction over FeVO_(4)/TiO_(2)catalysts via regulating the electron transfer between Fe and V

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第2期35卷 489-495页

作者： Yunang Dong Penglu Wang Xiangyu Liu Jiang Deng Aling Chen Lupeng Han dengsong zhang International Joint Laboratory of Catalytic Chemistry State Key Laboratory of Advanced Special SteelCollege of SciencesShanghai UniversityShanghai 200444China

The presence of alkali metals in exhaust gas from stationary resources causes a grand challenge for the practical application of selective catalytic reduction(SCR)of NO_(x) with NH_(3).Here,alkali-resistant NO_(x) reduction has been successfully implemented via tailoring the electron transfer over Fe and V species on FeVO_(4)/TiO_(2)*** strong interaction between Fe and V induced electron transfer from V to Fe and strengthened the adsorption and activation of NH_(3)and NO over active VO_(x) *** the presence of K_(2)O,the strong electron withdrawing effect of Fe offset the electron donating effect of K on the VO_(x) species,thus protecting the active species VO_(x) to maintain the NO_(x) reduction *** enhanced adsorption and activation of NH_(3) allowed SCR reaction to proceed via E-R mechanism even after K_(2)O *** work elucidated the electronic effects on the alkali metals resistance of traditional ferric vanadate SCR catalysts and provided a promising strategy to design SCR catalysts with superior alkali resistance.

关键词： Air pollution control NO_(X)reduction Selective catalytic reduction Alkali metals Electron transfer

Design of artificial biomimetic channels with Na^(+)permeation rate and selectivity potentially outperforming the natural sodium channel

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第9期17卷 8638-8646页

作者： Zhi Zhu Yan Zhao Chao Chang Shaojian Yan Tingyu Sun Shiyu Gu Yangmei Li dengsong zhang Chunlei Wang Xiao Cheng Zeng School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China Innovation Laboratory of Terahertz Biophysics National Innovation Institute of Defense TechnologyBeijing 100071China School of Physics Peking UniversityBeijing 100871China International Joint Laboratory of Catalytic Chemistry College of SciencesShanghai UniversityShanghai 200444China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China

Artificial ion channels that enable high-efficiency ion transport have important implications in nanofluidics and biomedical applications such as drug ***,we show a simulation-based chemical design of a biomimetic sodium channel that possesses permeation rate and selectivity potentially higher than those of the state-of-the-art natural vertebrate voltage-gated sodium ***,our theoretical findings have undergone empirical testing,aligning well with the Arrhenius law as derived from a diverse range of experimental *** high-efficiency ion transport is achieved by anchoring the carboxylate functional groups within the channel filter.A key chemical guiding principle underlying the ion channel design is that the free-energy barrier for the Na^(+)passage across the channel should be comparable to typical thermal energy at room *** the implementation of the chemical design,we found that the relatively low free-energy barrier can be attributed to the compensation effect of the carboxylate groups to the partially lost oxygen shell of the ion within the ion channel,as well as to the consonant vibration of the ions inside and outside the *** mechanistic understanding brings new insight,at the molecular level,into the high-efficiency ion transport across the designed membrane *** proof of principle achieved from the simulations will stimulate future experimental confirmation and potential applications of the high-performance artificial channels in nanofluidics and in bioinspired iontronics.

关键词： sodium channels anchoring carboxylate functional groups molecular dynamics simulations low free-energy barrier for ion passage thermal kinetic energy

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

过渡金属水氧化催化剂及光阳极研究进展

陶瓷学报 2024年第4期45卷 643-657页

作者：黎健郭兴华张登松汪德高上海大学理学院上海200444 中国科学院、宁波材料技术与工程研究所先进能源材料工程实验室浙江宁波315201

光电化学(PEC)分解水为太阳能转换为氢能提供了一种极具潜力的绿色、可持续发展策略。复杂缓慢的水氧化反应限制了水分解的速率,因此高效光阳极的设计和制备被广泛关注和深入研究。总结了过渡金属水氧化催化剂,包括多相和均相非贵金属... 详细信息

光电化学(PEC)分解水为太阳能转换为氢能提供了一种极具潜力的绿色、可持续发展策略。复杂缓慢的水氧化反应限制了水分解的速率,因此高效光阳极的设计和制备被广泛关注和深入研究。总结了过渡金属水氧化催化剂,包括多相和均相非贵金属水氧化催化剂以及贵金属水氧化催化剂的研究进展。同时,介绍了过渡金属基光阳极的构筑及其性能,包括无机半导体光阳极TiO_(2)、Fe_(2)O_(3)、BiVO_(4)以及染料敏化光阳极。最后,提出构建高效稳定的水分解光阳极的策略及发展方向,为其将来在工业规模上实现高效和经济的太阳能—氢能转换提供参考。

关键词：水分解水氧化过渡金属水氧化催化剂染料敏化光阳极

Shape and size effects of ceria nanoparticles on the impact strength of ceria/epoxy resin composites

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Particuology 2011年第1期9卷 80-85页

作者： Xiaoqiang He dengsong zhang Hongrui Li Jianhui Fang Liyi Shi Research Center of Nano Science and Technology Shanghai University Shanghai 200444 China Department of chemistry Shanghai University Shanghai 200444 China

Ceria nanoparticles with various shapes （rods, cubes, and plates） and sizes were controllably synthesized and then introduced into epoxy resin. Subsequently, we investigated correlations between the shape and size of ceria nanostructures and the mechanical performance of composites. The samples were character- ized by transmission electron microscopy, scanning electron microscopy, and X-ray diffraction. Compared with commercial ceria filled composites, the composites made with morphology-controlled ceria nanos- tructures show a higher impact strength. It is found that epoxy resins made with high-aspect-ratio ceria nanorods show the highest impact strength, up to 17.27 kJ/m2, which is about four times that of the neat epoxy resin.

关键词： Nanoparticles Ceria Composite Mechanical properties

Unraveling SO_(2)-tolerant mechanism over Fe_(2)(SO_(4))_(3)/TiO_(2) catalysts for NO_(x) reduction

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第1期34卷 340-350页

作者： Chong Feng Lupeng Han Penglu Wang Xiangyu Liu Guangyuan Zhou dengsong zhang State Key Laboratory of Advanced Special Steel School of Materials Science and EngineeringInternational Joint Laboratory of Catalytic ChemistryCollege of SciencesShanghai UniversityShanghai 200444China Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023China

Developing low-temperature SO_(2)-tolerant catalysts for the selective catalytic reduction of NO_(x) is still a challenging *** sulfation of active metal oxides and deposition of ammonium bisulfate deactivate catalysts,due to the difficult decomposition of the as-formed sulfate species at low temperatures(300℃);however,the SO_(2)-tolerant mechanism of metal sulfate catalysts is still *** this study,Fe_(2)(SO_(4))_(3)/TiO_(2) and Ce_(2)(SO_(4))_(3)/TiO_(2) catalysts were prepared using the corresponding metal sulfate salt as the *** catalysts were tested for their low-temperature activity and SO_(2) tolerance *** to Ce_(2)(SO_(4))_(3)/TiO_(2),Fe_(2)(SO_(4))_(3)/TiO_(2) showed significantly better low-temperature activity and SO_(2) *** was demonstrated that less surface sulfate species formed on Fe_(2)(SO_(4))_(3)/TiO_(2) and Ce_(2)(SO_(4))_(3)/TiO_(2).However,the presence of NO and O_(2) could assist the decomposition of NH_(4)HSO_(4) over Fe_(2)(SO_(4))_(3)/TiO_(2) at a lower temperature,endowing Fe_(2)(SO_(4))_(3)/TiO_(2) with better low-temperature SO_(2) tolerance than Ce_(2)(SO_(4))_(3)/TiO_(2).This study unraveled the SO_(2)-tolerant mechanism of Fe_(2)(SO_(4))_(3)/TiO_(2)at lower temperatures(<300℃),and a potential strategy is proposed for improving the low-temperature SO_(2)-tolerance of catalysts with Fe_(2)(SO_(4))_(3) as the main active component or functional promoter.

关键词： NO_(x) Selective catalytic reduction Sulfate Catalysts SO_(2)-tolerance

在线全文

学校读者我要写书评

暂无评论

复杂工况烟气氮氧化物催化净化

能源环境保护 2024年第4期38卷 1-16页

作者：王芃芦张雨欣叶贞丽张登松上海大学碳中和创新研究中心上海200444

氮氧化物作为主要的大气污染物之一,对人类健康和大气环境造成严重危害。近年来,我国电力行业持续减少烟气中的氮氧化物排放,非电行业和新兴发电行业如垃圾焚烧/生物质燃烧发电等领域的烟气氮氧化物污染控制成为固定源烟气减排的重点。... 详细信息

氮氧化物作为主要的大气污染物之一,对人类健康和大气环境造成严重危害。近年来,我国电力行业持续减少烟气中的氮氧化物排放,非电行业和新兴发电行业如垃圾焚烧/生物质燃烧发电等领域的烟气氮氧化物污染控制成为固定源烟气减排的重点。目前,氨法选择性催化还原是应用最广泛且最有效的烟气氮氧化物净化技术。然而,非电行业和新兴发电行业烟气氮氧化物净化工况条件十分复杂,烟气中通常存在大量酸性气体(SO_(2)、HCl)、碱/碱土金属(Na、K、Ca)、重金属(Pb、Cd、As)和磷化合物等毒物,极易导致催化剂中毒失活。为了解决在复杂工况烟气中氮氧化物净化催化剂失活的问题,研究人员对催化剂的抑制中毒作用进行了广泛且系统的研究,包括提高催化剂对SO_(2)的耐受性、改善对碱金属和碱土金属的抗性,以及提升复杂工况烟气条件下的复合中毒抗性。综述了复杂工况烟气氮氧化物催化净化技术的研究进展,总结了催化剂抑制SO_(2)中毒、抑制碱/碱土金属中毒以及抑制复合中毒的有效策略,为开发高效、稳定且抑制中毒的烟气氮氧化物净化催化剂提供了参考和思路,同时也为推进氮氧化物净化催化剂在非电行业和新兴发电行业的复杂工况烟气净化中的实际应用提供了理论指导。

关键词：氮氧化物选择性催化还原非电行业新兴发电行业复杂工况烟气环境催化

Template/surfactant free and UV light irradiation assisted fabrication of Mn-Co oxides composite nanorings: Structure and synthesis mechanism

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2019年第2期29卷 163-169页

作者： Wentao Jiang Xiaonan Hu Muhammad Yaseen Liyi Shi dengsong zhang Jianping zhang Lei Huang Research Center of Nano Science and Technology Shanghai University Institute of Chemical Sciences University of Peshawar

A facile, green, cost effective, and template or surfactant free strategy via a two-step route i.e. UV irradiation followed by dissolution-growth for the controlled synthesis of Mn-Co composite nanorings at room temperature was proposed. The nanorings structures and the process were systematically studied via TEM, HRTEM, EDX and XRD. Bir-MnO;nanosheets first formed through the direct photolysis of KMnO;under UV light irradiation. This was followed by a dissolution-growth process via the dissolution of Bir-MnO;nanosheets by the generated H;from the redox reaction between the added Co（NO;）;and residual KMnO;, as well as the accompanied formation of CoOOH, and Mn-Co composite nanorings. It was found that a balance between the dissolution and growth rate was needed. Suitable pH, KMnO;presence and the starting nanosheets like Bir-MnO;were the key factors for the formation of nanorings. The obtained Mn-Co nanorings/TiO;showed enhanced efficiency for the catalytic oxidation of HCHO. Based on the above understandings, it is believed that the developed dissolution-growth method can be adopted for the designing and preparation of other Mn-Co composite nanostructures which can be further applied for environmental pollution remediation.

关键词： KMnO4 irradiation Template free green synthesis MnO2 nanoring Co3O4 Structural characterization