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CH_4-CO_2 reforming to syngas over Pt-CeO_2-ZrO_2/MgO catalysts: Modification of support using ion exchange resin method

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Journal of Natural Gas Chemistry 2012年第1期21卷 76-82页

作者： Min Yang haijun guo Yansheng Li Qiong Dang School of Environment and Chemical Engineering Dalian Jiaotong UniversityDalian 116028LiaoningChina

Pt-CeO2-ZrO2/MgO （Pt-CZ/MgO） catalysts with 0.8 wt% Pt, 3.0 wt% CeO2 and 3.0 wt% ZrO2 were prepared by wet impregnation method. Support MgO was obtained using ion exchange resin method or using commercial MgO. XRD, BET, SEM, TEM, DTA-TG and CO2-TPD were used to characterize the catalysts. CH4-CO2 reforming to synthesis gas （syngas） was performed to test the catalytic behavior of the catalysts. The catalyst Pt-CZ/MgO-IE（D） prepared using ion exchange resin exhibits more regular structure, smaller and more unique particle sizes, and stronger basicity than the catalyst Pt-CZ/MgO prepared from commercial MgO. At 1073 K and atmospheric pressure, Pt-CZ/MgO-IE（D） catalyst has a higher activity and greater stability than Pt-CZ/MgO catalyst for CH4-CO2 reforming reaction at high gas hourly space velocity of 36000 mL/（g.h） with a stoichiometric feed of CH4 and C02. Activity measurement and characterization results demonstrate that modification of the support using ion exchange resin method can promote the surface structural property and stability, therefore enhancing the activity and stability for CH4-CO2 reforming reaction.

关键词： Pt-CeO2-ZrO2/MgO catalyst CH4-CO2 reforming support modification stability

Oxidative depolymerization of lignin improved by enzymolysis pretreatment with laccase

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Journal of Energy Chemistry 2018年第3期27卷 801-805页

作者： Yuan Zhu Xinping Ouyang Ying Zhao Linfeng Jiang haijun guo Xueqing Qiu School of Chemistry and Chemical Engineering South China University of TechnologyGuangzlzou 510640duangdongChino

A new lignin depolymerization approach for improving the yield of aromatic monomers（YAM） by enzymolysis pretreatment was investigated, in which lignin was pretreated with laccase followed by oxidative depolymerization. It was found that lignin depolymeirzation was enhanced significantly by enzymolysis. The oxidative depolymerization contributed to 21.37% of YAM after the enzymolysis pretreatment,whereas the conventional oxidative depolymerization only gave 14.10% of YAM. The addition of ethanol in enzymatic pretreatment process improved the efficiency of enzymolysis, which effectively improved the solubility of pretreated lignin and depolymerization degree（DD） of lignin. The enzymolysis pretreatment increased the content of syringyl（S） style aromatic monomers, which hindered the recondensation among polymerized products. As lignin has low solubility in acidic aqueous solution, ethanol was added into enzymolysis system to improve the efficiency. However, the enzymolysis of lignin should be carried out for a limited period of time to prevent the inactivation of laccase.

关键词： Lignin Depolymerization Enzymolysis Pretreatment Aromatic monomer

Gas desorption characteristics of the high-rank intact coal and fractured coal

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International Journal of Mining Science and Technology 2015年第5期25卷 819-825页

作者： Lu Shouqing Cheng Yuanping Qin Liming Li Wei Zhou Hongxing guo haijun National Engineering Research Center of Coal Gas Control China University of Mining & Technology School of Safety Engineering China University of Mining & Technology Key Laboratory of Gas and Fire Control for Coal Mine China University of Mining & Technology

The objective of this work is to study the gas desorption characteristics of the high-rank intact coal and fractured *** gas adsorption,mercury porosimetry and gas desorption experiments were carried out in this ***,the theories of thermodynamics,diffusion mechanism and desorption kinetics were used to estimate the gas desorption *** results of gas adsorption experiments show that the initial isosteric adsorption heat of the intact coal is greater than that of the fractured coal,indicating that the gas molecules desorb more easily from fractured coal than intact *** the mercury porosimetry,we find that the diffusion channels of fractured coal are more developed than those of intact *** difficult diffusion form dominates in the intact coal during the gas diffusing,while the easy diffusion form dominates in the fractured *** results of gas desorption experiments show that the initial gas desorption volume and velocity of the fractured coal are both greater than those of the intact *** the Fick diffusion law,the study calculates the gas diffusion coefficients of the intact coal and fractured *** diffusion coefficients of the fractured coal are 2 times and 10 times greater than those of the intact coal at the time of 0-120 and 0-10 min,respectively.

关键词： Intact coal Fractured coal Isosteric adsorption heat Diffusion coefficient

Evaluation of the weakening behavior of gas on the coal strength and its quantitative influence on the coal deformation

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International Journal of Mining Science and Technology 2021年第3期31卷 451-462页

作者： haijun guo Kai Wang Yuchen Wu Hanlu Tang Jianguo Wu Lianhe Guan Chenyang Chang Chao Xu Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources China University of Mining and Technology-BeijingBeijing 100083China School of Emergency Management and Safety Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China Kailuan(Group)Co. Ltd.Tangshan 063018China

The coal strength and deformation properties are key factors affecting safe coal mining and highefficiency coalbed methane(CBM)*** this paper,reconstituted coal samples are chosen to investigate the weakening behavior of gas on coal strength,meanwhile,its effects on coal deformation are quantitatively *** results indicate that the weakening degree of gas on coal strength is closely related to the confining stress and gas *** with non-gas-saturated coals,the maximum weakening ratios of adsorbed gas to coal strength are 10.58%,18.12%,8.55%and 14.65%under the conditions of confining stress CS=3 MPa and gas pressure GP=1 MPa,CS=3 MPa and GP=2 MPa,CS=4 MPa and GP=1 MPa,and CS=4 MPa and GP=2 MPa,***,the maximum weakening ratios of free gas to coal strength are 18.27%,36.54%,14.79%and 29.58%,respectively,under above four *** maximum coal bulk strain decreases as particle sizes of coal powders increase,and it has a maximum value of 0.0227 and a minimum value of 0.0191 in particle size ranges of 0.01–0.041 and 0.5–1 *** the same conditions,the coal bulk strain increases with increasing gas pressure,revealing that coal deformation properties can be enhanced by gas.

关键词： Gas-saturated coal Coal strength Weakening effect Coal deformation Quantitative evaluation Mechanical loading

Thermodynamic evaluation and hydrothermal preparation of K_xNa_(1-x)NbO_3

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Rare Metals 2008年第4期27卷 371-377页

作者： ZHANG Ci LV haijun guo Min ZHANG Mei WANG Xidong Department of Physical Chemistry University of Science and Technology Beijing Beijing 100083 China College of Engineering. Peking University Beijing 100871 China

The Gibbs free energies of reaction △rGτ of KNbO3 and NaNbO3 were calculated and then that of KxNa1-xNbO3 was estimated. On the basis of the thermodynamic calculation results, the hydrothermal temperatures were designed at 100, 160, and 230℃ respectively. However, NaNbO3 was prepared when the heating temperature was higher than 160℃, and KNbO3 and KxNa1-xNbO3 were obtained at 230℃, suggesting that only at a higher temperature the kinetic requirement is satisfied. According to the X-ray diffraction results, both the solid solutions, NaNbO3-based solid solution, Na1-xKxNbO3, and KNbO3-based solid solution, K1-xNaxNbO3, were hydrothermally synthesized in 6 mol/L alkali （NaOH and KOH） solution at 230℃.

关键词： KNbO3 NaNbO3 thermodynamic calculation hydrothermal synthesis Gibbs free energy

330 MW发电厂厂用电零序保护越级跳闸原因分析及处理

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能源科技 2024年第5期22卷 58-61,73页

作者：雷振山郭海骏杨勇康振华朱佳国能驻马店热电有限公司河南驻马店463000

国能驻马店热电有限公司(以下简称驻马店公司)1号机组厂变A分支零序过流动作跳闸,厂用电快切装置闭锁切换,导致6 kV IA段母线失电。对机组跳机原因进行分析,并提出了全新的6 kV厂用电设备微机综合保护装置校验及开关实际分闸时间测定方... 详细信息

国能驻马店热电有限公司(以下简称驻马店公司)1号机组厂变A分支零序过流动作跳闸,厂用电快切装置闭锁切换,导致6 kV IA段母线失电。对机组跳机原因进行分析,并提出了全新的6 kV厂用电设备微机综合保护装置校验及开关实际分闸时间测定方法,对分析保护时限配合以及实际厂用电保护定值整定的可靠性具有一定的参考价值。

关键词：零序过流闭锁切换实际分闸时间可靠性

“互联网+”视角下安全工程专业教学改革研究

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安全 2024年第3期45卷 53-57页

作者：郭海军于英杰应如翼王云鹤徐超中国矿业大学(北京)应急管理与安全工程学院北京100083

为研究“互联网+”视角下安全工程专业教学模式改革的新思路,依据“互联网+”的技术特色,借助“互联网+”技术优化传统教学模式,提出基于“互联网+”的安全工程专业教学模式建设思路和对老师、学生的基本要求。研究表明:和传统教学模式... 详细信息

为研究“互联网+”视角下安全工程专业教学模式改革的新思路,依据“互联网+”的技术特色,借助“互联网+”技术优化传统教学模式,提出基于“互联网+”的安全工程专业教学模式建设思路和对老师、学生的基本要求。研究表明:和传统教学模式相比,基于“互联网+”的教学模式具有学习自由度增强、知识包容度增强和学习开放性提高等优势;该教学模式是一种动态教学管理模式,从前期建设、过程控制、后期追踪、全流程考核等方面均要做出科学的规划;在此模式教学过程中需由老师和学生密切配合,共同完成,并逐渐强化学生的主体地位。

关键词：安全工程互联网+ 教学模式教学改革

Object use in insects

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Insect Science 2024年第4期31卷 1001-1014页

作者： Chao Wen Cai Wang Xiaoli guo Hongyu Li haijun Xiao Junbao Wen Shikui Dong School of Grassland Science Beijing Forestry UniversityBeijingChina College of Forestry and Landscape Architecture South China Agricultural UniversityGuangzhouChina Beijing Key Laboratory for Forest Pest Control Beijing Forestry UniversityBeijingChina

Insects are the most diverse group of organisms in the animal kingdom,and some species exhibit complex social *** research on insect object use is still in its early stages,insects have already been shown to display rich object-use *** review focuses on patterns and behavioral flexibility in insect object-use behavior,and the role of cultural evolution in the development of object-use *** use in insects is not widespread but has been documented in a diverse set of *** insects can use objects flexibly and display various object-use *** mammals and birds,insects use objects in diverse activities,including foraging,predator defense,courtship,and ***,pre-existing manipulative behaviors,and anatomical structure affect innovations in object *** addition,learning and imitation are the main mechanisms underlying the spread of object-use behaviors within *** that insects are one of the major animal groups engaging in object use,studies of insect object use could provide general insights into object use in the animal kingdom.

关键词： cognition evolution insects learning object use

多部门协同促进住院患者静脉输液规范使用的实践

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中国卫生标准管理 2024年第2期15卷 134-138页

作者：张靓靓辛忠袁少飞周伊宁王颖莉关敬之郭海军内蒙古科技大学包头医学院第二附属医院护理部内蒙古包头014030 内蒙古科技大学包头医学院第二附属医院药学部内蒙古包头014030 包头市疾病预防控制中心公共卫生科内蒙古包头014030 内蒙古自治区国际蒙医医院药学部内蒙古呼和浩特010065

目的探讨提高住院患者静脉输液规范使用综合干预的效果。方法通过院内电脑系统导出内蒙古科技大学包头医学院第二附属医院2020年1—12月(干预前)、2022年1—12月(干预后)住院患者静脉输液相关数据。比较多部门综合管理和多方监测干预在... 详细信息

目的探讨提高住院患者静脉输液规范使用综合干预的效果。方法通过院内电脑系统导出内蒙古科技大学包头医学院第二附属医院2020年1—12月(干预前)、2022年1—12月(干预后)住院患者静脉输液相关数据。比较多部门综合管理和多方监测干预在内的各项措施干预前后对住院患者静脉输液率、静脉输液量、重点监控药物静脉输液使用强度等相关指标的影响,并以此评价各部门协同干预实施效果以及不足。结果干预后住院患者静脉输液率为85.09%(17444/20501),低于干预前的89.13%(19536/21919),差异有统计学意义(P<0.05)。多部门协同干预前后住院患者静脉输液指标均有所下降,差异有统计学意义(P<0.05)。结论多部门联合干预下,可以有效降低住院患者静脉输液各项指标。临床合理用药成效明显,为药事管理以及医疗质量管理提供了参考。

关键词：多部门联合干预静脉输液率使用强度规范用药