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Role of Ni species in ZnO supported on Silicalite-1 for efficient propane dehydrogenation

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Chinese Journal of Chemical Engineering 2022年第3期35卷 240-247页

作者： Bofeng Zhang Mingxia Song Hongwang liu Guozhu Li sibao liu Li Wang Xiangwen Zhang Guozhu liu Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Zhejiang Institute of Tianjin University Ningbo 315201China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

Propane dehydrogenation(PDH)is one of the most effective technologies to produce ***-noble zinc-based catalysts have paid increasing attention because of low cost and nontoxic,compared with industrial Pt and Cr-based ***,they often suffer from limited catalytic activity and poor ***,we introduced moderate Ni into ZnO supported Silicalite-1 zeolite to increase catalytic activity and stability ***^(2+) was the definite active site and NiZn alloy facilitated the sluggish H recombination into H_(2)via reverse ***,the introduction of Ni increased Lewis acid strength caused by electron transfer from ZnO to NiZn alloy,contributing to improved *** resulted 0.5 NiZn/S-1,propene formation rate was 0.18 mol C_(3)H_(6)·(g Zn)^(-1)·h^(-1) at 550℃,which was above 1.5 times higher than that over Zn/S-1 without *** stability test,the deactivation of0.5 NiZn/S-1 was 0.019 h^(-1),which was only 1/10 of that over Zn/S-1.

关键词： Propane dehydrogenation NiZn alloy Reverse hydrogen spillover Lewis acid Zeolite

纳米晶堆积结构ZSM-5微球的合成及其在2-甲基萘甲基化中的应用

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石油学报（石油加工） 2015年第3期31卷 705-710页

作者：靳立军刘斯宝胡浩权大连理工大学化工学院煤化工研究所精细化工国家重点实验室辽宁大连116024

以乙烯基三乙氧基硅烷和正硅酸乙酯为双硅源,采用变温晶化法合成纳米晶堆积结构ZSM-5微球,并采用XRD、FT-IR、SEM、TEM和N2吸附-脱附手段对其进行结构表征,考察了其对2-甲基萘(2-MN)与甲醇烷基化合成2,6-二甲基萘(2,6-DMN)反应的催化性... 详细信息

以乙烯基三乙氧基硅烷和正硅酸乙酯为双硅源,采用变温晶化法合成纳米晶堆积结构ZSM-5微球,并采用XRD、FT-IR、SEM、TEM和N2吸附-脱附手段对其进行结构表征,考察了其对2-甲基萘(2-MN)与甲醇烷基化合成2,6-二甲基萘(2,6-DMN)反应的催化性能。结果表明,所合成样品是由若干纳米晶堆积而成的高度晶化的ZSM-5分子筛,在合成2,6-DMN反应中显示出较高的催化活性和选择性,2-MN转化率最高可达39.2%,反应至8h时,2,6-DMN产率为7.1%,2,6-/2,7-DMN摩尔比可达1.9,主要归结于其较多的酸量和较弱的酸强度。

关键词：纳米沸石 ZSM-5 乙烯基三乙氧基硅烷 2-甲基萘 2,6-二甲基萘

Site-Selective Polyolefin Hydrogenolysis on Atomic Ru for Methanation Suppression and Liquid Fuel Production

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Research 2023年第3期6卷 423-432页

作者： Mingyu Chu Xianpeng Wang Xuchun Wang Xiangxi Lou Congyang Zhang Muhan Cao Lu Wang Youyong Li sibao liu Tsun-Kong Sham Qiao Zhang Jinxing Chen Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory of Advanced Negative Carbon TechnologiesJoint International Research Laboratory of Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123P.R.China Department of Chemistry University of Western OntarioLondonOntario N6A 5B7Canada Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Material Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Catalytic hydrogenolysis of end-of-life polyolefins can produce value-added liquid fuels and therefore holds great promises in plastic waste reuse and environmental *** major challenge limiting the recycling economic benefit is the severe methanation(usually>20%)induced by terminal C–C cleavage and fragmentation in polyolefin ***,we overcome this challenge by demonstrating that Ru single-atom catalyst can effectively suppress methanation by inhibiting terminal C–C cleavage and preventing chain fragmentation that typically occurs on multi-Ru *** Ru single-atom catalyst supported on CeO_(2)shows an ultralow CH_(4)yield of 2.2%and a liquid fuel yield of over 94.5%with a production rate of 314.93 gfuels gRu^(−1)h^(−1)at 250℃for 6 *** remarkable catalytic activity and selectivity of Ru single-atom catalyst in polyolefin hydrogenolysis offer immense opportunities for plastic upcycling.

关键词： catalyst olefin fragmentation

白藜芦醇等功能性化合物对C2C12肌管线粒体功能的影响

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基因组学与应用生物学 2020年第9期39卷 4372-4377页

作者：刘泗宝陈磊周杰山东省立医院(集团)市中医院济南250001

为发展体外模型作为细胞和分子抗疲劳研究的工具,本研究利用C2C12肌管体外评价功能性化合物(支链氨基酸和酚类化合物)的抗疲劳作用。结果显示,某些功能性化合物(包括白藜芦醇,表没食子儿茶素没食子酸酯和表儿茶素)能显著提高线粒体基因... 详细信息

为发展体外模型作为细胞和分子抗疲劳研究的工具,本研究利用C2C12肌管体外评价功能性化合物(支链氨基酸和酚类化合物)的抗疲劳作用。结果显示,某些功能性化合物(包括白藜芦醇,表没食子儿茶素没食子酸酯和表儿茶素)能显著提高线粒体基因(细胞色素b,细胞色素c氧化酶亚基Ⅱ)的表达、线粒体酶活性(包括柠檬酸合成酶)和细胞色素c氧化酶在C2C12肌管中的表达。本研究结果表明白藜芦醇、表没食子儿茶素没食子酸酯和表儿茶素作为新的线粒体激活剂具有很大的潜力,可能在抗疲劳方面发挥重要作用。

关键词： C2C12肌管白藜芦醇支链氨基酸表没食子儿茶素没食子酸酯表儿茶素

Frequency Regulation of VSC-MTDC System with Offshore Wind Farms

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 275-286页

作者： Haoyu liu Chongru liu North China Electric Power University Beijing 102206China

Frequency regulation of voltage source converter-based multi-terminal high-voltage direct current(VSC-MTDC)system with offshore wind farms enhances the frequency stability by compensating the power for a disturbed AC ***,it is difficult to reasonably allocate frequency-regulation resources due to a lack of coordination mechanisms between wind farms and the MTDC ***,it is difficult for the frequency control of the wind farms to manage changes in wind speed;and the risk of wind-turbine stalls is ***,based on the kinetic energy of wind turbines and the power margin of the converters,the frequency-regulation capability of wind turbines is evaluated,and a dynamic frequency-support scheme considering the real-time frequency-support capability of the wind turbines and system frequency evolution is proposed to improve the frequency-support performance.A power adaptation technique at variable wind speeds is developed;the active power in the frequency-support stage and restoration stage is switched according to the wind speed.A hierarchical zoning frequency-regulation scheme is designed to use the frequency-regulation resources of different links in the MTDC system with wind *** simulation results show that the novel frequency-regulation strategy maintains frequency stability with wind-speed changes and avoids multiple frequency dips.

关键词： Wind generation voltage source converter-based multi-terminal high-voltage direct current(VSC-MTDC) frequency regulation cooperative control adaptive control variable wind speed

A Novel Design of a Pre-separation Panel Structure to Protect Against the Impact of an Explosion in an Aircraft Plenum Chamber

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Acta Mechanica Solida Sinica 2024年第1期37卷 166-180页

作者： Zongxing liu Xiang Yang Jun liu School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China COMAC Shanghai Aircraft Design and Research Institute Shanghai 201210China

To reduce the damage of the pressurizing panel structure of a fuselage caused by an explosion at the“least risk bomb location”in an aircraft structure,a new pre-separation panel structure was designed to resist blast ***,the dynamic strain response and morphology of impact damage of the new pre-separation panel were measured in an impact damage ***,the commercial software LS-DYNA was used to calculate the propagation of the blast shock wave,and the results were compared with empirical equations to verify the rationality of the numerical calculation ***,the fluid–structure coupling method was used to calculate the damage process of the pre-separation panel structure under the impact of an explosion wave and an impact *** calculated results were in good agreement with the test results,which showed the rationality of the calculation method and the *** residual strength of the damaged pre-separation panel was significantly higher than that of the original damaged *** results show that the new pre-separation panel structure is reasonable and has certain significance for guiding the design of plenum chambers with strong resistance to implosion for aircraft fuselages.

关键词： Pre-separation panel structure Explosive response Residual strength Aircraft plenum chamber Least risk bomb location

Stochastic Unit Commitment with High-Penetration Offshore Wind Power Generation in Typhoon Scenarios

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Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 535-546页

作者： Yanqi liu Dundun liu Hongcai Zhang State Key Laboratory of Internet of Things for Smart City and Department of Electrical and Computer Engineering University of MacaoMacao 999078China University of Macao Zhuhai UM Science and Technology Research Institute ZhuhaiChina

To tackle the energy crisis and climate change,wind farms are being heavily invested in across the *** China's coastal areas,there are abundant wind resources and numerous offshore wind farms are being *** secure operation of these wind farms may suffer from typhoons,and researchers have studied power system operation and resilience enhancement in typhoon ***,the intricate movement of a typhoon makes it challenging to evaluate its spatial-temporal *** published papers only consider predefined typhoon trajectories neglecting *** address this challenge,this study proposes a stochastic unit commitment model that incorporates high-penetration offshore wind power generation in typhoon *** adopts a data-driven method to describe the uncertainties of typhoon trajectories and considers the realistic anti-typhoon mode in offshore wind farms.A two-stage stochastic unit commitment model is designed to enhance power system resilience in typhoon *** formulate the model into a mixed-integer linear programming problem and then solve it based on the computationally-efficient progressive hedging algorithm(PHA).Finally,numerical experiments validate the effectiveness of the proposed method.

关键词： Unit commitment two-stage stochastic programming offshore wind farm typhoon

Effectiveness and safety of acupuncture in treatment of pregnancyrelated symptoms:a systematic review and Meta-analysis

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Journal of Traditional Chinese Medicine 2024年第1期44卷 16-26页

作者： liu Tingting liu Tongou liu Mingfu School of Traditional Chinese Medicine Clinical Medicine Hubei University of Traditional Chinese MedicineWuhan 430000China First Clinical College of Hubei University of Traditional Chinese Medicine Wuhan 430000China Department of Acupuncture and Tuina Affiliated Hospital of Hubei University of Traditional Chinese MedicineHubei Provincial Hospital of Traditional Chinese MedicineWuhan 430000China

OBJECTIVE:To systematically evaluate the efficacy and safety of acupuncture(AM)in the treatment of pregnancyrelated symptoms such as acute vomiting during ***:We comprehensively searched the available literature up to November 2021,including Pub Med,Embase,Cochrane Library,Chinese Biomedical Literature Database,and China National Knowledge Infrastructure Database,for randomized controlled trials(RCTs)on AM for the treatment of severe vomiting,insomnia,pharyngeal and pelvic pain,mood abnormalities,and dyspepsia during ***:Sixteen RCTs with a cumulative sample size of 1178 cases were *** these,964 patients were included in the *** Meta-analysis results showed that AM was more efficient than Western medicine in treating discomfort during pregnancy[odds ratio(OR)=1.19,95%confidence interval(CI)(1.11,1.28),P<0.01].AM was better than the control group in improving the visual analog scale scores[standard mean difference(SMD)=0.62,95%CI(0.53,0.71),P<0.01].AM was superior to the control group in improving Numerical Rating Scale(NRS)symptom scores[OR=7.31,95%CI(3.36,15.94),P<0.01].There was no significant difference in adverse effects between the AM and sham-AM groups and the analgesic drug group[OR=0.70,95%CI(0.39,1.28),P=0.25],but the treatment and control groups had mild adverse effects with a low ***:AM is more effective than other treatments or pharmacotherapy alone in the treatment of pregnancy-related symptoms,and is relatively ***,the quality of the included trials was rather poor,and high-quality studies are required to confirm our findings.

关键词： acupuncture pregnancy nausea vomiting sleep initiation and maintenance disorders low back pain pelvic pain mood abnormalities Meta-analysis systematic review

Devolatilization of high viscous fluids with high gravity technology

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Chinese Journal of Chemical Engineering 2024年第7期71卷 249-257页

作者： Jibing Qi Youzhi liu Yandong liu Taiyuan University Taiyuan 030032China Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering North University of ChinaTaiyuan 030051China

Volatile organic compounds(VOCs)are generally toxic and harmful substances that can cause health and environmental *** removal of VOCs from polymers has become a key *** effective devolatilization to remove VOCs from high viscous fluids such as polymer is necessary and is of great *** this study,the devolatilization effect of a rotating packed bed(RPB)was studied by using polydimethylsiloxane as the viscous fluid and acetone as the *** devolatilization rate and liquid phase volume(KLa)have been *** results indicated that the optimum conditions were the high-gravity factor of 60,liquid flow rate of 10 L·h^(-1),and vacuum degree of 0.077 *** dimensionless correlation of KLa was established,and the deviations between predicted and experimental values were less than±28%.The high-gravity technology will result in lower mass transfer resistance in the devolatilization process,enhance the mass transfer process of acetone,and improve the removal effect of *** work provides a promising path for the removal of volatiles from polymers in combination with high-gravity *** can provide the basis for the application of RPB in viscous fluids.

关键词： High-gravity technology Devolatilization rate High viscous fluid Volatile organic compounds(VOCs)