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Co_(3)O_(4)as an efficient passive NO_(x) adsorber for emission control during cold-start of diesel engines

Chinese Journal of Chemical Engineering 2024年第2期66卷 1-7页

作者： Jinhuang Cai shijie hao Yun Zhang Xiaomin Wu Zhenguo Li Huawang Zhao Department of Environmental Science&Engineering College of Chemical EngineeringHuaqiao UniversityXiamen 361021China Wuxi Weifu Environmental Catalysts Co. LtdWuxi 214000China National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology&Research Center Co.Ltd.Tianjin 300300China

The Co_(3)O_(4)nanoparticles,dominated by a catalytically active(110)lattice plane,were synthesized as a low-temperature NO_(x) adsorbent to control the cold start emissions from *** nanoparticles boast a substantial quantity of active chemisorbed oxygen and lattice oxygen,which exhibited a NO_(x) uptake capacity commensurate with Pd/SSZ-13 at 100℃.The primary NO_(x) release temperature falls within a temperature range of 200-350℃,making it perfectly suitable for diesel *** characterization results demonstrate that chemisorbed oxygen facilitate nitro/nitrites intermediates formation,contributing to the NO_(x) storage at 100℃,while the nitrites begin to decompose within the 150-200℃***,lattice oxygen likely becomes involved in the activation of nitrites into more stable nitrate within this particular temperature *** concurrent processes of nitrites decomposition and its conversion to nitrates results in a minimal NO_(x) release between the temperatures of 150-200℃.The nitrate formed via lattice oxygen mainly induces the NO_(x) to be released as NO_(2) within a temperature range of 200-350℃,which is advantageous in enhancing the NO_(x) activity of downstream NH_(3)-SCR catalysts,by boosting the fast SCR reaction *** to its low cost,considerable NO_(x) absorption capacity,and optimal release temperature,Co_(3)O_(4)demonstrates potential as an effective material for passive NO_(x) adsorber applications.

关键词： Emission control Cold-start Low-temperature adsorption Co_(3)O_(4) Nitrate formation

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Highly active and stable Co nanoparticles embedded in nitrogen-doped mesoporous carbon nanofibers for aqueous-phase levulinic acid hydrogenation

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Green Energy & Environment 2021年第4期6卷 567-577页

作者： Shuai Shao Ying Yang Shangwei Guo shijie hao Feng Yang Suoying Zhang Yang Ren Yangchuan Ke State Key Laboratory of Heavy Oil Processing China University of PetroleumChangpingBeijing102249China X-Ray Science Division Argonne National Laboratory9700 S.Cass Ave.ArgonneIllinois60439USA

Developing a highly active and durable non-noble metal catalyst for aqueous-phase levulinic acid(LA)hydrogenation to g-valerolactone(GVL)is an appealing yet challenging ***,we report well-dispersed Co nanoparticles(NPs)embedded in nitrogen-doped mesoporous carbon nanofibers as an efficient catalyst for aqueous-phase LA hydrogenation to *** Co zeolitic imidazolate framework(ZIF-67)nanocrystals were anchored on the sodium dodecyl sulfate modified wipe fiber(WF-S),yielding one-dimensional(1-D)structured composite(ZIF-67/WF-S).Subsequently,Co NPs were uniformly embedded in nitrogen-doped mesoporous carbon nanofibers(Co^(R)NC/SMCNF)through a pyrolysis-reduction strategy using ZIF-67/WF-S as the *** from introducing modified wipe fiber WF-S to enhance the dispersion of Co NPs,and Co^(0) with Co-N_xdual active sites,the resulting Co^(R)NC/SMCNF catalyst shows brilliant catalytic activity(206 h^(-1) turnover frequency).Additionally,the strong metal-support interactions greatly inhibited the Co NPs from aggregation and leaching from the mesoporous carbon nanofibers,and thus increasing the reusability of the Co^(R)NC/SMCNF catalyst(reusable nine times without notable activity loss).

关键词： Co nanoparticles Mesoporous carbon nanofiber Dual active sites Aqueous levulinic acid hydrogenation High stability

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Investigation on the Mechanical Properties and Shape Memory Effect of Landing Buffer Structure Based on Ni Ti Alloy Printing

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Chinese Journal of Mechanical Engineering 2023年第4期36卷 415-424页

作者： Zhenglei Yu Renlong Xin Zezhou Xu Yining Zhu Xiaolong Zhang shijie hao Zhihui Zhang Ping Liang State Key Laboratory of Automotive Simulation and Control Jilin University Key Lab of Bionic Engineering Ministry of Education Jilin University Agriculture College Yanbian University State Key Laboratory of Heavy Oil Processing China University of Petroleum

With the deepening of human research on deep space exploration, our research on the soft landing methods of landers has gradually deepened. Adding a buffer and energy-absorbing structure to the leg structure of the lander has become an effective design solution. Based on the energy-absorbing structure of the leg of the interstellar lander, this paper studies the appearance characteristics of the predatory feet of the Odontodactylus scyllarus. The predatory feet of the Odontodactylus scyllarus can not only hit the prey highly when preying, but also can easily withstand the huge counter-impact force. The predatory feet structure of the Odontodactylus scyllarus, like a symmetrical cone, shows excellent rigidity and energy absorption capacity. Inspired by this discovery, we used SLM technology to design and manufacture two nickel-titanium samples, which respectively show high elasticity, shape memory, and get better energy absorption capacity. This research provides an effective way to design and manufacture highmechanical energy-absorbing buffer structures using bionic 3D printing technology and nickel-titanium alloys.

关键词： Bionic protective structure Odontodactylus scyllarus NiTi alloy 3D printing Numerical simulation Recoverability

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Long-term ultra-precision phase synchronization technique for locking the repetition rate of OFCs based on FLOM-PD

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Optoelectronics Letters 2022年第12期18卷 712-716页

作者： ZHOU Weifeng hao shijie CHEN Xing ZHANG Wanpeng YUE Zongjie WU Hong College of Electronic Information and Optical Engineering Nankai UniversityTianjin300350China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai UniversityTianjin300350China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing100876China Engineering Research Center of Thin Film Optoelectronics Technology Nankai UniversityTianjin300350China

Long-term ultra-precision synchronization between optical frequency combs(OFCs) and microwave oscillators is important for various fields, including scientific observation, smart grid, positioning and navigation, etc. Here, a phase-locked loop system based on fiber loop optical-microwave phase detector(FLOM-PD) is proposed to realize the synchronization of the repetition rate of OFCs and rubidium atomic clocks. Firstly, the scheme and locking process of the system are elaborated, then the mathematical model of the system is established, and the feasibility of the scheme is proved by theoretical analysis and experimental verification. After synchronization, the instability of the system reaches 8.69×10^(-12)at 1 s and 2.94×10^(-13)at 1 000 s, indicating that the phase synchronization system can achieve ultra-precision and stability of OFCs repetition rate.

关键词： synchronization repetition phase

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Endowing low fatigue for elastocaloric effect by refined hierarchical microcomposite in additive manufactured NiTiCuCo alloy

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International Journal of Extreme Manufacturing 2024年第4期6卷 307-322页

作者： Bo Feng Helong Liu Ying Yang Hui Shen Yang Ren Yinong Liu Lishan Cui Bingmin Huang shijie hao College of New Energy and Materials China University of PetroleumBeijing 102249People's Republic of China College of Chemical Engineering and Environment China University of PetroleumBeijing 102249People's Republic of China Department of Physics City University of Hong Kong83 Tat Chee AvenueKowloonHong Kong Special Administrative Region of ChinaPeople's Republic of China Department of Mechanical Engineering The University of Western AustraliaPerthWA 6009Australia Jiangsu Smart Advanced Material Tech Co. LtdXuzhou 221000People's Republic of China

NiTiCu-based shape memory alloys have been considered as ideal materials for solid-state refrigeration due to their superb cycling stability for elastocaloric ***,the embrittlement and deterioration caused by secondary phase and coarse grains restrict their applications,and it is still challenging since the geometric components are ***,bulk NiTiCuCo parts with excellent forming quality were fabricated by laser powder bed fusion(LPBF)*** as-fabricated alloy exhibits refined three-phases hierarchical microcomposite formed based on the rapid cooling mode of LPBF,composed of intricate dendritic Ti2Ni–NiTi composite and nano Ti2Cu embedded inside the *** configuration endows far superior elastocaloric stability compared to the as-cast *** low fatigue stems from the strong elastic coupling between the interphases with reversible martensite transformation,revealed by in-situ synchrotron high-energy x-ray *** fabrication of NiTiCuCo alloy via LPBF fills the bill of complex geometric structures for elastocaloric NiTiCu *** understanding of interphase micro-coupling could provide the guide for designing LPBF fabricated shape memory-based composites,enabling their applications for special demands on other functionalities.

关键词： NiTiCuCo shape memoryalloy microcomposite high-energyx-raydiffraction laser powderbedfusion

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Selective laser melting of NiTi alloy with superior tensile property and shape memory effect

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Journal of Materials Science & Technology 2019年第10期35卷 2238-2242页

作者： Zhiwei Xiong Zhonghan Li Zhen Sun shijie hao Ying Yang Meng Li Changhui Song Ping Qiu Lishan Cui State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China Qian Xuesen Laboratory of Space Technology China Academy of Space TechnologyBeijing100094China School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhou510641China

It is a challenge to develop complex-shaped Ni Ti shape memory alloy parts by traditional processing methods, due to the poor machinability of Ni Ti alloy. It is reported that selective laser melting(SLM) of additive manufacturing could overcome this problem. However, the reported SLM-produced Ni Ti exhibits poor tensile ductility due to the inner defects and adverse unidirectional columnar grains from SLM process. In this work, the defect-less SLM-Ni Ti with nondirective columnar grains was fabricated by optimizing the intraformational laser scanning length and interformational laser scanning direction. The obtained lath-shaped SLM-Ni Ti sample exhibits tensile strain of 15.6%, more than twice of the reported maximum result(7%). Besides, the SLM-Ni Ti part with complex geometry displays a shape memory recovery of 99% under compressive deformation of 50%.

关键词： NiTi shape memory alloy Selective laser melting Tensile ductility Shape memory effect

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Grain-size gradient NiTi ribbons with multiple-step shape transition prepared by melt-spinning

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Journal of Materials Science & Technology 2021年第12期71卷 163-168页

作者： Xiangguang Kong Ying Yang Shiyu Guo Ran Li Bo Feng Daqiang Jiang Meng Li Changfeng Chen Lishan Cui shijie hao State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China Beijing Key Laboratory of Failure Corrosionand Protection of Oil/Gas FacilitiesChina University of Petroleum BeijingBeijing102249China Key Laboratory of Aerospace Materials and Performance School of Materials Science and EngineeringBeihang UniversityBeijing100191China Qian Xuesen Laboratory of Space Technology China Academy of Space TechnologyYouyi Street No.104HaidianBeijing100094China

A grain-size gradient Ni Ti ribbon with multiple-step shape transition was papered by means of *** ribbons contain coarse and fine grains in the free surface side and copper roller surface side,*** grain-size gradient microstructure induces a two-stage phase transformation behavior in the ribbons during heating or *** tensile deformation pre-treatment,the ribbons exhibit a back-and-forth shape change(shape A→B→A)upon a single heating or cooling process,resulting from the sequential phase transformation through the thickness of the ribbon as dictated by gradient grain *** activating performance of the ribbons,*** transition amplitude and speed,can be customized by controlling the pre-deformation *** work offers a new opportunity for innovative designs to reach a novel shape memory behavior in Ni Ti alloys conveniently and efficiently.

关键词： NiTi shape memory alloy Melt spinning Shape memory effect Martensitic transformation

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Distinct effect of preparation methods on reaction efficiency of Mn-Ce/Al_(2)O_(3) catalysts in low-temperature NH_(3)-SCR

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Journal of Rare Earths 2024年第10期42卷 1865-1872页

作者： shijie hao Yandi Cai Wei Wei Yanan Lv Jiawei Ji Wei Tan Jingfang Sun Liwei Jia Changjin Tang Lin Dong State Key Laboratory of Pollution Control and Resource Reuse School of EnvironmentJiangsu Key Laboratory of Vehicle Emissions ControlCenter of Modern AnalysisKey Laboratory of Mesoscopic Chemistry of MOESchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing210023China Wuxi Weifu Environmental Catalysts Co. LtdWuxi214028China School of Environment Nanjing Normal UniversityNanjing210023China

In this study,a series of Mn-Ce/Al_(2)O_(3) catalysts was prepared by different methods of depositionprecipitation(MnCeAl-DP),impregnation(MnCeAl-IM) and citric acid(MnCeAl-CA),and the distinct effect of preparation methods on NO_(x) removal performance at low temperature was *** show that MnCeAl-DP exhibits not only the best activity but also the highest resistance against SO_(2)/H_(2)*** the assistance of comprehensive characterizations from scanning electron microscopy(SEM),Brunauer-Emmett-Teller(BET),X-ray diffraction(XRD),H_(2)-temperature programmed reduction(H_(2)-TPR),NH_(3)-te mperature programmed deso rption(NH_(3)-TPD),and X-ray photoelectron spectroscopy(XPS),it is revealed that the MnCeAl-DP sample owns admired features of large surface area and pore volume,enriched Mn^(4+) and chemisorbed oxygen species originating from enhanced interaction between MnO_x and CeO_(2),as well as improved adsorption capacity to NH_(3) and *** these factors contribute to activity *** in-situ DRIFTS studies reveal that the improvement of NH_(3)-SCR performance over MnCeAI-DP is related to the formation of abundant nitrate species,which is beneficial to the "NH_(4)NO_(3)" reaction pathway and thus enhances low-temperature activity.

关键词： Mn-Ce/Al_(2)O_(3)catalysts NH_(3)-SCR Low temperature NH_(4)NO_(3) Fast SCR Rare earths

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Exploiting ultra-large linear elasticity over a wide temperature range in nanocrystalline NiTi alloy

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Journal of Materials Science & Technology 2020年第22期54卷 197-203页

作者： Zhen Sun shijie hao Genfa Kang Yang Ren Junpeng Liu Ying Yang Xiangguang Kong Bo Feng Cheng Wang Kun Zhao Lishan Cui State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China Beijing Key Laboratory of Failure Corrosionand Protection of Oil/Gas FacilitiesChina University of Petroleum BeijingBeijing 102249China X-ray Science Division Argonne National LaboratoryArgonneIL 60439USA State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China

Many shape memory alloys can support large recoverable strains of a few percent by reversible stressinduced martensite transformation,yet they behave non-linear within a narrow operating temperature ra *** the bulk metallic materials with ultra-large linear elasticity over a wide tempe rature range has proven to be *** this work,a material design concept was proposed,that is true elastic deformation and reversible twinning-detwinning deformation run in parallel to overcome this challe *** engineering the residual internal stress to realize the concurrency of true elastic deformation and twinning-detwinning deformation,a bulk nanocrystalline NiTi that possesses an ultra-large linear elastic strain up to 5.1 % and a high yield stress of 2.16 GPa over a wide temperature range of 270℃ was *** study offers a new avenue for developing the metallic materials with ultra-large linear elasticity over a wide temperature range of 270℃(from 70℃ to-197℃).

关键词： NiTi Nanocrystalline Linear-elasticity Wide temperature range Twinning

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Selective laser melted high Ni content TiNi alloy with superior superelasticity and hardwearing

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Journal of Materials Science & Technology 2022年第21期116卷 246-257页

作者： Hui Shen Qingquan Zhang Ying Yang Yang Ren Yanbao Guo Yafeng Yang Zhonghan Li Zhiwei Xiong Xiangguang Kong Zhihui Zhang Fangmin Guo Lishan Cui shijie hao State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China The Key Laboratory of Bionic Engineering(Ministry of Education)and the College of Biological and Agricultural Engineering Jilin UniversityChangchun 130025China Department of Physics City University of Hong KongKowloonHong KongChina College of Mechanical and Transportation Engineering China University of PetroleumBeijing 102249China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

TiNi alloys with high content Ni(52-55 at.%)are perfectly suitable for preparing wear-and corrosionresistant parts that service on the space station,spacecraft,and submarine,because of their superior superelasticity,high strength,and ***,the fabrication of complicated Ni-rich TiNi parts by the traditional machining method often faces problems of poor precision,low efficiency,and high *** this work,we succeed in preparing an excellent Ti_(47)Ni_(53) alloy by selective laser melting(SLM),and thus,open a new way for the efficient and precise formation of complicated Ni-rich TiNi parts with superelasticity and *** optimized processing window for compact parts without defects is *** elaborately fabricated Ti_(47)Ni_(53) alloy exhibited a breaking strain of 11%,a breaking stress of 2.0 GPa,a superelastic strain of 9%,and a better hardwearing than that of casting and quenched Ti_(47)Ni_(53) ***,the microstructure,phase transformation,and deformation,as well as their influence mechanisms are investigated by in situ transmission electron microscope(TEM)and high-energy X-ray diffraction(HE-XRD).The results obtained are of significance for both fundamental research and technological applications of SLM-fabricated high Ni content TiNi alloys.

关键词： Selective laser melting High Ni content TiNi Superelasticity Wear In situ high-energy X-ray diffraction Microstructure

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