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Cavity-controlled methanol conversion over zeolite catalysts

National Science Review 2023年第9期10卷 72-91页

作者： Wenna Zhang Shanfan Lin Yingxu Wei Peng Tian mao ye Zhongmin Liu National engineering Research Center of Lower-Carbon Catalysis technology Dalian National Laboratory for Clean Energy iChEM(Collaborative Innovation Center of Chemistry for Energy Materials) Dalian Institute of Chemical Physics Chinese Academy of Sciences energy College University of Chinese Academy of Sciences State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences

The successful development and application in industry of methanol-to-olefins(MTO) process brought about an innovative and efficient route for olefin production via non-petrochemical resources and also attracted attention of C1 chemistry and zeolite *** sieve catalysts with diversified microenvironments embedding unique channel/cavity structure and acid properties,exhibit demonstrable features and advantages in the shape-selective catalysis of ***,shape-selective catalysis over8-MR and cavity-type zeolites with acidic supercage environment and narrow pore opening manifested special host-guest interaction between the zeolite catalyst and guest reactants,intermediates and *** caused great differences in product distribution,catalyst deactivation and molecular diffusion,revealing the cavity-controlled methanol conversion over 8-MR and cavity-type zeolite ***,the dynamic and complicated cross-talk behaviors of catalyst material(coke)-reaction-diffusion over these types of zeolites determines the catalytic performance of the methanol *** this review,we shed light on the cavity-controlled principle in the MTO reaction including cavity-controlled active intermediates formation,cavity-controlled reaction routes with the involvement of these intermediates in the complex reaction network,cavity-controlled catalyst deactivation and cavity-controlled *** these were exhibited by the MTO reaction performances and product selectivity over 8-MR and cavity-type zeolite *** strategies inspired by the cavity-controlled principle were developed,providing great promise for the optimization and precise control of MTO process.

关键词： methanol-to-olefins cavity-controlled principle reaction intermediates and routes deactivation and diffusion shape-selective catalysis

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Functionalized nanographene oxide/PeG/rhodamine B/gold nanocomposite for electrochemical determination of glucose

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Journal of Materials Science & technology 2022年第27期122卷 141-147页

作者： Wenhao Qian Tao Song mao ye Xiaoyu Huang Yongjun Li Bingjie Hao Department of Stomatology Shanghai Xuhui District Dental Center 500 Fenglin RoadShanghai 200032China Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Center for Excellence in Molecular SynthesisChinese Academy of SciencesShanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesShanghai 200032China

Diabetes,one of the most serious metabolism diseases,has continually plagued human beings so that timely monitored blood glucose level is very *** nanoparticles(Au NPs)have been considered as potential substitutes for non-enzymatic sensors,due to their unusual physicochemical property and efficient catalytic ***,we prepared a facial platform for Au NPs to maintain good dispersity and inherent physicochemical *** this special platform(SH-n GO-PeG-Rh B),nanographene oxide(n GO)was employed as an ideal base,which provided adequate carboxyls for conjugating with poly(ethylene glycol)(PeG),and enough epoxy groups for thiol active site.A functional dye(rhodamine B)with preferable fluorescence properties was also introduced into this *** NPs were then aptly in situ grown on the platform via reduction of HAuCl_(4) under mild conditions,providing Au NPs@SHn GO-PeG-Rh *** nanocomposite was cast on a glassy carbon electrode(GCe)conveniently,yielding GCe/Au NPs@SH-n GO-PeG-Rh ***,as shown by cyclic voltammetry(CV)and ready-state amperometry,GCe/Au NPs@SH-n GO-PeG-Rh B was capable of electrochemical determination of glucose so as to provide an efficient sensor for glucose determination with dye tracer.

关键词： Nano-graphene oxide Gold nanoparticles Glucose Biosensor Rhodamine B

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Single Molecule Imaging with Liquid Phase electron Microscopy

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Chinese Journal of Chemistry 2023年第6期41卷 679-684页

作者： Jia-ye Li De-Yi Zhang Sheng mao Huan Wang College of Chemistry and Molecular engineering Bejing National Laboratory for Molecular SciencesCenter for SpectroscopyBejing Key Laboratory of Polymer Chemistry&Physics of Ministry of EducationCenter for Soft Matter Science and EngineeringNational Biomedical Imaging CenterPeking UniversityBeijing 100871China Department of Mechanics and engineering Sciences College of EngineeringPeking UniversityBejing 100871China

Few single-molecule experiments have enabled the direct imaging of functional biomacromolecules in real-time in their native liquid environments,resolving their conformational adaptations,transient interactions,and intermediate *** phase electron microscopy(LP-eM),due to its unique combination of spatial and temporal resolution,has shown to be a promising *** experiments have enabled successful imaging of intact structures of organic molecules and biological systems with an ordinary electron *** image processing methods and quantitative data analysis from single particle experiments based on the optical microscope,quantifying motion and relaxation of these interacting molecules allows the experimental observations of pathways,to test theoretical predictions,and discovery of new *** LP-eM with tomography,fluorescence,and mass spectroscopy allows for probing multi-dimensional structural and dynamic *** remain in obtaining high-quality data in large quantities,which can be improved by developing new liquid cell platforms and machine learning-based data analysis.

关键词： Single-molecule studies Direct Imaging Liquid-phase electron microscopy Analytical methods Image analysis

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Transition-Metal-Catalyzed Synthesis of Chiral Allylboronates

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Chinese Journal of Chemistry 2021年第6期39卷 1716-1725页

作者： Wenbo Ming Xiaocui Liu Lujia mao Xiao Gu Qing ye Department of Chemistry Southern University of Science and TechnologyShenzhenGuangdong 518055China

Since the pioneering work on Cr(Ⅲ)-catalyzed enantioselective[4+2]/allylboration reported by Hall and co-workers,a variety of catalytic methodologies for the asymmetric allylic borylation reactions have been developed to provide chiral allylboronates bearing a wide range of functional *** review article describes recent advances in transition-metal catalyzed preparation of chiral allylboronates,especially on those in the past three years,and with the emphasis on the aspect of asymmetric *** to the mechanism of achieving the chemo-,regio-,stereo-and enantioselectivities,the discussion is divided in two parts:substrate-controlled and catalyst-controlled synthesis.

关键词： Allylboronates Homoallyl Alcohols Asymmetric Synthesis Homogeneous Catalysis Transition Metals

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Curvature Compensated CMOS Bandgap Reference with Novel Process Variation Calibration technique

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Journal of Beijing Institute of technology 2018年第2期27卷 182-188页

作者： Jiancheng Zhang mao ye Yiqiang Zhao Gongyuan Zhao Tianjin Key Laboratory of Imaging and Sensing Microelectronic technology Tianjin UniversityTianjin 300072China Tianjin Infrared Imaging technology engineering Center Tianjin 300072China

A lowtemperature coefficient（ TC） bandgap reference（ BGR） with novel process variation calibration technique is proposed in this paper. This proposed calibration technique compensating both TC and output value of BGR achieves fine adjustment step towards the reference voltage,while keeping optimal TC by utilizing large resistance to help layout match. The high-order curvature compensation realized by poly and p-diffusion resistors is introduced into the design to guarantee the temperature characteristic. Implemented in 180 nm technology,the proposed BGR has been simulated to have a power supply rejection ratio（ PSRR） of 91 dB@100 Hz. The calibration technique covers output voltage scope of 0. 49 V-0. 56 Vwith TC of 9. 45 × 10^（-6）/℃-9. 56 × 10^（-6）/℃ over the temperature range of-40 ℃-120 ℃. The designed BGR provides a reference voltage of 500 mV,with measured TC of 10. 1 × 10^（-6）/℃.

关键词： bandgap reference voltage process variation resistance-trimming current-calibration curvature compensation temperature coefficient

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Response of phytoplankton to multispecies mariculture:a case study on the carrying capacity of shellfish in the Sanggou Bay in China

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Acta Oceanologica Sinica 2008年第1期27卷 102-112页

作者： Ge Changzi FANG Jianguang SONG Xiefa mao Yuze ye Naihao Department of Marine Fishery Ocean University of China Qingdao 266003 China Key Laboratory for Sustainable Utilization of Marine Fishery Resource Yellow Sea Fisheries Research Institute Qingdao266071 China

A muhispecies model for shellfish polycuhure in the Sanggou Bay in China used for large-scale long-line cultivation of the Chinese scallop Chlamysfarreri, the Pacific oyster Crassostrea gigas and the kelp Laminaria japonica is presented. The model includes key physical processes which are the transports of matter at the system boundary, and the main biological process that is the primary production and nutrients release from the bottom. By the model, the seasonal fluctuations of phytoplankton biomass and dissolved inorganic nitrogen（DIN） in 1994 are simulated. Furthermore, if the kelp culture scale is kept constant and the Chinese scallop and the Pacific oyster culture scales are adjusted, virtual shellfish farms are funded and responses of phytoplankton to the largescale shellfish culture are simulated. According to these simulated results, the room limitation, and the hypothesis that shellfish will not grow well if the phytoplankton biomass is less than 8.2 mg/m^3 , the expandable multiple of scallop culture k and that of oyster culture y are determined as k = -0.276 5y ＋4.690 5 and 0.133 3k ＋0.006 6y≤0.667 5, where, k （ or y） is equal to 1, the culture scale of scallop （ or oyster） is 8.8 x 109 individuals （or 66 ha, with a density of 59 ind./m^2 ）, and the kelp culture scale is 3 300 ha with a density of 12 ind./m^2.

关键词： multispecies model kelp Chinese scallop Pacific oyster carrying capacity

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endoscopic treatments for small gastric subepithelial tumors originating from muscularis propria layer

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World Journal of Gastroenterology 2015年第32期21卷 9503-9511页

作者： Yu Zhang Li-Ping ye Xin-Li mao Department of Gastro-enterology Taizhou Hospital of Zhejiang Province Wenzhou Medical College

Minimally invasive endoscopic resection has become an increasingly popular method for patients with small(less than 3.5 cm in diameter) gastric subepithelial tumors(SeTs) originating from the muscularis propria(MP) layer. Currently, the main endoscopic therapies for patients with such tumors are endoscopic muscularis excavation, endoscopic full-thickness resection, and submucosal tunneling endoscopic resection. Although these endoscopic techniques can be used for complete resection of the tumor and provide an accurate pathological diagnosis, these techniques have been associated with several negative events, such as incomplete resection, perforation, and bleeding. This review provides detailed information on the technical details, likely treatment outcomes, and complications associated with each endoscopic method for treating/removing small gastric SeTs that originate from the MP layer.

关键词： Gastric subepithelial tumors endoscopic treatment

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Genetic Diversity Within a Jackfruit (Artocarpus heterophyllus Lam.) Germplasm Collection in China Using AFLP Markers

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Agricultural Sciences in China 2010年第9期9卷 1263-1270页

作者： LI Ying-zhi mao Qi FeNG Feng ye Chun-hai Horticulture and Forestry Department Guangdong Ocean University Zhanjiang 524088 P.R.China

Jackfruit is cross-pollinated and mostly seed propagated, a wide range of variation exists in fruit quality. With the development of efficient vegetative propagation methods, excellent genotypes selected from these seed propagated seedlings will gradually replace other genotypes in jackfruit producing areas. In this study, genetic diversity of 50 jackfruit accessions from three provinces in China was analyzed based on amplified fragment length polymorphic （AFLP） markers. A total of 320 unambiguous bands were produced by eight primer combinations, and 65 （20.3%） of them were polymorphic. Genetic similarity coefficients ranged from 0 to 0.9841, with an average of 0.5000, indicating a moderate genetic diversity in this collection. The dendrogram derived by unweighted pair group method with arithmetic mean algorithm （UPGMA） analysis revealed five groups, and no correlation between genetic relationship and geographical origin were found. Accessions of soft and firm flesh type were not clustered into distinct groups, neither could yearly bearing once, or twice fruit accessions. This study has provided useful information for collection and preservation of jackfruit germplasm worldwide.

关键词： jackfruit genetic diversity AFLP molecular markers

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Kinetics of steam regeneration of SAPO-34 zeolite catalyst in methanol-to-olefins(MTO) process

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Chinese Journal of Chemical engineering 2021年第7期34卷 231-238页

作者： Huaiqing An Hua Li Jibin Zhou Jinling Zhang Tao Zhang mao ye Zhongmin Liu National engineering Laboratory for Methanol to Olefins Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China

Methanol-to-olefins(MTO)is industrially applied to produce ethylene and propylene using methanol converted from coal,synthetic gas,and ***-34 zeolites,as the most efficient catalyst in MTO process,are subject to the rapid deactivation due to coke *** work shows that steam regeneration can provide advantages such as low carbon dioxide emission and enhanced light olefins yield in MTO process,compared to that by air regeneration.A kinetic study on the steam regeneration of spent SAPO-34 catalyst has been carried out in this *** doing so,we first investigated the effect of temperature on the regeneration performance by monitoring the crystal structure,acidity,residual coke properties and other structural *** results show that with the increase of regeneration temperature,the compositions of residual coke on the catalyst change from pyrene and phenanthrene to naphthalene,which are normally considered as active hydrocarbon pool species in MTO ***,when the regeneration temperature is too high,nitrogen oxides can be found in the residual ***,as the regeneration temperature increases,the quantity of residual coke reduces and the acidity,BeT surface area and pore structure of the regenerated samples can be better recovered,resulting in prolonging catalyst *** have further derived the kinetics of steam regeneration,and obtained an activation energy of about 177.8 kJ·mol^(-1).Compared that with air regeneration,the activation energy of steam regeneration is higher,indicating that the steam regeneration process is more difficult to occur.

关键词： Methanol to olefins(MTO) SAPO-34 zeolite catalyst Steam regeneration Regeneration kinetics

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Automatic Road extraction Using Particle Filters from High Resolution Images

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Journal of China University of Mining and technology 2006年第4期16卷 490-493页

作者： ye Fa-mao SU Lin TANG Jiang-long Department of Computer Science and engineering Nanchang University Nanchang Jiangxi 330029 China Institute of Remote Sensing Applications Chinese Academy of Sciences Beijing 100101 China east China Institute of technology Fuzhou Jiangxi 344000 China

Road extraction plays an important role in many applications such as car navigation, but the manual extraction of roads is a laborious, tedious task. To speed the extraction of roads, an approach based on particle filtering to extract automatically roads from high resolution imagery is proposed. Particle filtering provides a statistical framework for propagating sample-based approximations of posterior distributions and has almost no restriction on the ingredients of the model. We integrate the similarity of grey value and the edge point distribution of roads into particle filtering to deal with complex scenes. To handle road appearance changes the tracking algorithm is allowed to update the road model during temporally stable image observations. A fully automatic initialization strategy is used. experimental results show that the proposed approach is a promising and fully automatic method for extracting roads from images, even in the presence of occlusions.

关键词： road extraction particle filters high resolution images

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