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Self-assembly synthesis of phosphorus-doped tubular g-C_(3)N_(4);Ti_(3)C_(2)MXene Schottky junction for boosting photocatalytic hydrogen evolution

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Green Energy & Environment 2023年第1期8卷 233-245页

作者： Kelei Huang Chunhu Li Xiuli Zhang Liang Wang Wentai Wang Xiangchao Meng Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of ChinaQingdao266100China

Establishing highly effective charge transfer channels in carbon nitride(g-C_(3)N_(4)) to enhance its photocatalytic activity is still a challenging issue.Herein,the delaminated 2D Ti_(3)C_(2) MXene nanosheets were employed to decorate the P-doped tubular g-C_(3)N_(4)(PTCN)for engineering 1D/2D Schottky heterojunction(PTCN/TC)through electrostatic self-assembly.The optimized PTCN/TC exhibited the highest hydrogen evolution rate(565 μmol h^(-1)g^(-1)),which was 4.3 and 2.0-fold higher than pristine bulk g-C_(3)N_(4) and PTCN,respectively.Such enhancement may be primarily attributed to the phosphorus heteroatom doped and unique structure of 1D/2D g-C_(3)N_(4)/Ti_(3)C_(2) Schottky heterojunction,enhancing the light-harvesting and charges’separation.One-dimensional pathway of g-C_(3)N_(4) tube and built-in electric field of interfacial Schottky effect can significantly facilitate the spatial separation of photogenerated charge carriers,and simultaneously inhibit their recombination via Schottky barrier.In this composite,metallic Ti_(3)C_(2) was served as electrons sink and photons collector.Moreover,ultrathin Ti_(3)C_(2) flake with exposed terminal metal sites as a co-catalyst exhibited higher photocatalytic reactivity in H2 evolution compared to carbon materials(such as reduced graphene oxide).This work not only proposed the mechanism of tubular g-C_(3)N_(4)/Ti_(3)C_(2) Schottky junction in photocatalysis,but also provided a feasible way to load ultrathin Ti_(3)C_(2) as a co-catalyst for designing highly efficient photocatalysts.

关键词： Tubular g-C_(3)N_(4) Ti_(3)C_(2)MXene Schottky junction Photocatalyst Hydrogen evolution

Influence of CaO and HZSM-5 on oxygen migration in Chlorella vulgaris polysaccharide pyrolysis

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Carbon Resources Conversion 2019年第2期2卷 111-116页

作者： Xiuli Zhang Chunhu Li Anhong Tian Qingjie Guo Kelei Huang Key Laboratory of Clean Chemical Processing of Shandong Province College of Chemical EngineeringQingdao University of Science and TechnologyQingdaoShandong 266042People’s Republic of China Key Laboratory of Marine Chemistry Theory and Engineering Technology of Ministry of Education College of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100ShandongPeople’s Republic of China

With polysaccharides of Chlorella pyrenoidosa as the raw material,the effects of CaO and HZSM-5 on the yield of bio-oil and the oxygen content in each phase in the pyrolysis of Chlorella vulgaris polysaccharides(CVP),which occurred in a tube furnace at 600℃,were comprehensively investigated.The reaction path of deoxidation was also analyzed by TG,GC and GC-MS.The GC-MS analysis of liquids showed that liquids from the pyrolysis of chlorella polysaccharides included a range of light oxygenated compounds(e.g.,furans,ketones and phenols),and the oxygen content of furan compounds decreased significantly with CaO and HZSM-5.Compared with the direct pyrolysis of polysaccharides(CVP),the catalytic pyrolysis contributed to the decrease in the oxygen content of organic components by 7.32%and 5.76%.The GC analysis showed that there was a remarkable downtrend in the release of oxygen-containing gas(CO and CO_(2)),and the emission of CO_(2) decreased from 53.11%to 32.92%.The results of the thermogravimetric analysis indicated that the reaction paths of deoxidation in the pyrolysis process of polysaccharides(CVP)with CaO and HZSM-5 varied from those of the direct pyrolysis process:the catalytic pyrolysis with HZSM-5 promoted the conversion of carbohydrate from furans to aromatics over strong acid sites,which was consistent with previous studies;CaO not only acted as a catalyst but also participated in the reaction to change the reaction paths.All results and findings can help to further understand the thermochemical utilization of CPP for bio-oil.

关键词： Chlorella vulgaris polysaccharides CaO HZSM-5 Pyrolysis Organic compounds Deoxidation Reaction paths

Cotton stalk activated carbon-supported Co-Ce-B nanoparticles as efficient catalysts for hydrogen generation through hydrolysis of sodium borohydride

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Carbon Resources Conversion 2019年第3期2卷 225-232页

作者： Xiuli Zhang Chunhu Li Jianlin Qub Qingjie Guo Kelei Huang Key Laboratory of Marine Chemistry Theory and Engineering Technology of Ministry of Education College of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100ShandongChina Key Laboratory of Clean Chemical Processing of Shandong Province College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina

Porous cotton stalk activated carbons(CSAC)were prepared by phosphoric acid activation of cotton stalks in a fluidized bed.The CSAC-supported Co-B and Co-Ce-B catalysts were prepared by the impregnation-chemical reduction method.The samples were characterized by the nitrogen adsorption,XRD,FTIR and TEM measurements.The effects of the sodium borohydride(NaBH_(4))and sodium hydroxide(NaOH)concentrations,reaction temperature and recyclability on the rate of NaBH_(4)hydrolysis over the CSAC-supported Co-Ce-B catalysts were systematically investigated.The results showed that the agglomeration of the Co-Ce-B nanoclusters on the CSAC support surface was significantly reduced with the introduction of cerium.The CSAC-supported Co-Ce-B catalyst exhibited superior catalytic activity and the average hydrogen generation rate was 16.42 L min^(−1)g^(−1)Co at 25℃,which is higher than the most reported cobalt-based catalysts.The catalytic hydrolysis of NaBH_(4)was zero order with respect to the NaBH_(4)concentration,and the hydrogen generation rate decreased with the increase in the NaOH concentration.The activation energy of the hydrogen generation reaction on the prepared catalyst was estimated to be 48.22 kJ mol^(−1).A kinetic rate equation was also proposed.

关键词： Sodium borohydride Hydrogen Activated carbon Co-Ce-B catalyst Catalytic activity Kinetics

Esterification of acetic acid with isobutanol catalyzed by ionic liquid n-sulfopropyl-3-methylpyridinium trifluoromethanesulfonate:Experimental and kinetic study

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Chinese Journal of Chemical Engineering 2023年第11期63卷 21-30页

作者： Meng Shi Kelei Huang Ruining He Yinghua Jiang Yun Zou Jing Xu Zhangfa Tong Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology School of Chemistry and Chemical EngineeringGuangxi UniversityNanning 530004China

As an important organic,isobutyl acetate(IbAc)has been widely used in industries because of its good biodegradability,low surface tension,and other properties.The industrial production of IbAc is usually catalyzed by sulfuric acid.However,the use of sulfuric acid has the drawbacks of causing considerable corrosion to equipment and being difficult to be separated.In this work,n-sulfopropyl-3-methylpyridinium trifluoromethanesulfonate([HSO_(3)-PMPY][CF_(3)SO_(3)])Bronsted acidic ionic liquid(BAIL)was used as the catalyst and the catalytic activity,solubility,and corrosiveness were evaluated for the esterification of acetic acid with isobutanol.The reaction kinetics and chemical equilibrium were systemically studied.Compared to conventional acid catalysts,[HSO_(3)-PMPY][CF_(3)SO_(3)]showed higher catalytic activity,more excellent reusability,more favorable phase separation,and non-corrosiveness.Three kinetic equations based on ideal homogeneous(IH),non-ideal homogeneous(NIH),and modified nonideal homogeneous(NIH-M)models were established and correlated with the experimental data to determine the parameters and errors.The NIH-M model exhibited the best agreement with the experimental data,owing to its prediction considering the non-ideality and the self-catalysis effect of acetic acid in this system.Besides,the error of NIH-M model fitting was mainly caused by the difference in solubility between[HSO_(3)-PMPY][CF_(3)SO_(3)]with reactants and products in the reaction system.Furthermore,the applicability of the NIH-M model was investigated by simulating the esterification of acetic acid with three short-chain alcohols(ethanol,n-butanol,and isobutanol)catalyzed by BAILs.The NIH-M model displayed an acceptable simulation for this type of acetic acid esterification reaction catalyzed by BAILs at different ranges of the BAILs concentration and temperature.This study confirmed the industrial prospects of[HSO_(3)-PMPY][CF_(3)SO_(3)]in isobutyl acetate production and the applicability of the NIH-M kinetic model in the esterif

关键词： Esterification Isobutyl acetate Ionic liquid Kinetics

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大型露天矿山边坡控制爆破与降振技术

矿业工程 2024年第1期22卷 17-20页

作者：黄克磊江西国泰集团江西铜业民爆矿服有限公司江西德兴334200

针对大孔径大规模爆破,爆破振动危害效应大等问题,提出基于某大型露天金属矿复杂环境下的边坡控制爆破,通过采取降低台阶分层高度,缩小炮孔直径,炮孔进行分段间隔装药来控制单孔药量,并通过电子雷管逐孔起爆技术,计算机模拟起爆网路手... 详细信息

针对大孔径大规模爆破,爆破振动危害效应大等问题,提出基于某大型露天金属矿复杂环境下的边坡控制爆破,通过采取降低台阶分层高度,缩小炮孔直径,炮孔进行分段间隔装药来控制单孔药量,并通过电子雷管逐孔起爆技术,计算机模拟起爆网路手段和预裂爆破技术等方式,达到降振效果。通过振动监测和边坡位移监测结果显示,采用这些降振技术可以尽可能减小爆破振动;同时总结出了该矿山的爆破振动规律和回归曲线,能够为复杂环境的控制爆破提供参考。

关键词：边坡爆破大孔径爆破间隔装药逐孔起爆

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基于数码电子雷管的非煤矿山爆破技术推广

矿业工程 2023年第5期21卷 29-32页

作者：刘杰黄克磊江西铜业民爆矿服有限公司江西德兴334200

数码电子雷管的推广应用,一方面使用环境与新产品的适应性存在差异性问题,另一方面新产品能较好地解决非电起爆网络无法处理的爆破技术瓶颈问题。从露天金属矿山难爆岩的爆破效果优化和掘进爆破盲炮的避免两个方面阐述了数码电子雷管的... 详细信息

数码电子雷管的推广应用,一方面使用环境与新产品的适应性存在差异性问题,另一方面新产品能较好地解决非电起爆网络无法处理的爆破技术瓶颈问题。从露天金属矿山难爆岩的爆破效果优化和掘进爆破盲炮的避免两个方面阐述了数码电子雷管的优越性,通过克服井下采场的磁电、杂散电流干扰和长距离起爆阐明了数码电子雷管的优越性。

关键词：非煤矿山电子雷管难爆岩盲炮电磁干扰

The 3D Numerical Simulation of the Shaped Charge Jet Penetration through the Steel Target

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The 3D Numerical Simulation of the Shaped Charge Jet Penetra...

NONSTATIONARY EFFECTS ON SAFE BASINS OF A FORCED SOFTENING DUFFING OSCILLATOR

2012年计算机应用与系统建模国际会议

作者： huang Junqing Zhang Wei Wang Wenyue huang kelei Department of Equipment Command and Administration AAFE

In this paper, adopted explicit dynamic analyzing program AUTODYN basing on finite element to simulate the process of the shaped charge jet formation and the penetration through the steel target, base on the characteristic of the shaped charge structure and the mechanisms of jet penetrating the target. Adopted ALE (Arbitrary Lagrange Euler) arithmetic to acquire numerical simulation results. By analyzing, the simulation result that the shaped charge jet formation is basically accordant by contrasting the physical phenomenon and rule. At one time,the result that the target be damaged is basically same by contrasting the result of the trial. The simulation model and method that the shaped charge jet formation and the penetration through the target are proved to be reasonable and feasible.

关键词： the shaped charge jet numerical simulation

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Acta Mechanica Solida Sinica 1998年第3期11卷 253-260页

作者： Gan Chunbiao Lu Qishao huang kelei Beijing Univ Aeronaut & Astronaut Dept Appl Math & Phys Beijing 100083 Peoples R China

The safe basin of a forced softening Duffing oscillator is studiednumerically. The changes of safe basins are observed under bothstationary and nonstationary variations of the external excitationfrequency. The kind of nonstationary variations of the excitationfrequency can greatly change the erosion rate and the shape of thesafe basin. The other effects of nonstatinary variations on the safebasin are also discussed.

关键词： Duffing oscillator safe basin nonstationary effects

基于16位单片机的装甲车辆液压系统的故障诊断系统

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仪器仪表学报 2005年第z2期26卷 603-605页

作者：刘国强黄克雷装甲兵工程学院机械工程系北京100072 装甲兵工程学院教保处北京100072

主要针对装甲车辆液压系统工作时故障率高、诊断困难且装甲车辆内部空间狭小等主要特点,设计了一种液压检测系统对诸如液压气蚀、液压冲击等液压系统常见故障进行测试。通过实车测试系统可以方便快捷的对故障进行定位、诊断。可以看出... 详细信息

主要针对装甲车辆液压系统工作时故障率高、诊断困难且装甲车辆内部空间狭小等主要特点,设计了一种液压检测系统对诸如液压气蚀、液压冲击等液压系统常见故障进行测试。通过实车测试系统可以方便快捷的对故障进行定位、诊断。可以看出该液压故障诊断系统具有实际的应用价值。

关键词：液压系统故障诊断 80C196单片机传感器系统液压气蚀液压冲击