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俾路支褐煤有机结构特征及大分子模型构建

洁净煤技术 2024年第6期30卷 75-84页

作者：任媛莫文龙马亚亚郭佳魏贤勇 AKRAM Naeem 新疆大学化工学院省部共建碳基能源资源化学与利用国家重点实验室新疆维吾尔自治区乌鲁木齐830046 新疆大学化工学院煤炭清洁转化与化工过程新疆维吾尔自治区重点实验室新疆维吾尔自治区乌鲁木齐830046 新疆能源(集团)有限公司新疆吾尔自治区乌鲁木齐830000 中国矿业大学煤炭加工与高效利用教育部重点实验室江苏徐州221116 明哈吉大学拉合尔分校化工学院巴基斯坦旁遮普拉合尔54000

以巴基斯坦俾路支褐煤(BL)为研究对象,由元素分析得出BL化学式为C_(167)H_(130)O_(53)N_(2)S。经X射线光电子能谱(XPS)分析BL有机结构中氧、氮和硫元素存在形式。利用傅里叶变换红外光谱(FT-IR)研究BL有机结构中主要官能团特征,-CH和-CH... 详细信息

以巴基斯坦俾路支褐煤(BL)为研究对象,由元素分析得出BL化学式为C_(167)H_(130)O_(53)N_(2)S。经X射线光电子能谱(XPS)分析BL有机结构中氧、氮和硫元素存在形式。利用傅里叶变换红外光谱(FT-IR)研究BL有机结构中主要官能团特征,-CH和-CH^(2)为BL脂肪族结构中主要官能团。BL中苯环主要取代形式为三取代和四取代。运用核磁共振光谱(^(13)C-NMR)探究BL有机结构碳骨架结构。BL分子结构中,芳香桥碳与周碳之比X_(BP)为0.21,碳主要由芳香碳和脂肪碳2部分构成,其中脂肪碳质量分数53.23%,芳香碳占比41.93%。芳香结构以苯环和萘环为主,氧主要以羧基、羰基、醚氧和酚羟基形式存在,而氮主要以吡咯氮形式存在,硫主要为噻吩。建立BL二维分子结构模型,通过Materials Studio对其进行加氢饱和,构建BL分子模型三维立体结构,进一步优化所得分子模型,空间效果显著,得到能量最低的BL三维结构模型,发现范德华能是BL分子结构稳定的关键因素。通过计算得到的BL模型结构^(13)C NMR谱图与试验所测谱图基本一致,验证了所构建BL结构模型的合理性。

关键词：褐煤分子结构核磁共振碳谱红外光谱 X射线光电子能谱

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煤化工水处理污泥对准东次烟煤热解和燃烧及气化性能的影响

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煤炭转化 2024年第4期47卷 89-103页

作者：刘竞杰马亚亚张书培杨晓勤莫文龙任铁真魏贤勇樊星省部共建碳基能源资源化学与利用国家重点实验室煤炭清洁转化与化工过程新疆维吾尔自治区重点实验室新疆大学化工学院乌鲁木齐830046 新疆宜化化工有限公司新疆昌吉831700 煤炭加工与高效洁净利用教育部重点实验室中国矿业大学化工学院江苏徐州221116 山东科技大学化学与生物工程学院山东青岛266590

解析煤化工水处理污泥(YS)的组成结构、微观形貌及官能团种类,探究不同实验气氛下其对准东次烟煤(ZSBC)热反应性能的影响,对于合理处置煤化工水处理污泥并实现其资源化利用具有较大现实意义。以ZSBC、YS和Y_(1)Z_(9)(YS与ZSBC按质量比为... 详细信息

解析煤化工水处理污泥(YS)的组成结构、微观形貌及官能团种类,探究不同实验气氛下其对准东次烟煤(ZSBC)热反应性能的影响,对于合理处置煤化工水处理污泥并实现其资源化利用具有较大现实意义。以ZSBC、YS和Y_(1)Z_(9)(YS与ZSBC按质量比为1∶9混合得到的样品)为研究对象,通过改变热量实验的气体氛围,研究不同反应气氛下YS对ZSBC热反应性能的影响。结果表明:ZSBC较YS富含固定碳和挥发分,而YS中的灰分含量较高且主要组成为含P,Ca和Fe等元素的化合物;YS的官能团种类较ZSBC的官能团种类更加丰富,且YS中主要为脂肪族化合物,而ZSBC中含有大量的芳香族化合物;惰性气氛下,YS的掺杂可以降低快速热解阶段(405℃~485℃)ZSBC活化能并增加指前因子,加快了Y_(1)Z_(9)在405℃~485℃温度段的反应进程;在氧化性气氛下,YS的掺杂可使ZSBC的着火点从475℃下降到443℃,综合燃烧特性指数(S)、燃烧稳定性指数(D)以及燃烧特性因子(A_(c))都得到增加;YS的掺杂可以降低380℃~550℃温度段ZSBC活化能并增加指前因子,促进Y_(1)Z_(9)在此温度段的燃烧反应;在二氧化碳气氛下,Y_(1)Z_(9)的平均初始反应性指数(R_(i))、反应性指数(R_(f))和平均终止反应指数(R_(s))均低于ZSBC的相应参数,表明YS的掺杂会延缓ZSBC的气化反应进程。

关键词：水处理污泥准东次烟煤热解燃烧 Coats-Redfern模型

五彩湾次烟煤醇解可溶物的组成特征与不溶物的快速热解产物分布

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化工进展 2024年第5期43卷 2449-2462页

作者：焦锟鹏赵子涛犹成裔莫文龙郭凤娇杨晓勤张书培郭佳魏贤勇樊星 AKRAM Naeem 新疆大学化工学院省部共建碳基能源资源化学与利用国家重点实验室煤炭清洁转化与化工过程新疆维吾尔自治区重点实验室新疆乌鲁木齐830046 新疆宜化化工有限公司新疆昌吉831700 新疆能源(集团)有限公司新疆乌鲁木齐830000 中国矿业大学煤炭加工与高效利用教育部重点实验室江苏徐州221116 山东科技大学化学与生物工程学院山东青岛266590 明哈吉大学拉合尔分校化工学院巴基斯坦旁遮普拉合尔54000

以异丙醇为溶剂在300℃对五彩湾次烟煤(WSBC)进行醇解,得到可溶物(SP)与不溶物(ISP)。GC/MS分析表明,SP中芳烃含量占比最大,质量分数为27.9%;其次是酚类化合物,说明含苯环的化合物在异丙醇醇解时更容易被提取。红外光谱表明,在脂肪族和... 详细信息

以异丙醇为溶剂在300℃对五彩湾次烟煤(WSBC)进行醇解,得到可溶物(SP)与不溶物(ISP)。GC/MS分析表明,SP中芳烃含量占比最大,质量分数为27.9%;其次是酚类化合物,说明含苯环的化合物在异丙醇醇解时更容易被提取。红外光谱表明,在脂肪族和芳香族区域ISP的吸收峰强度相对于原煤都有明显的升高,说明醇解过程破坏了煤的大分子结构,通过断键和醇解反应产生新的官能团。从TG-DTG曲线可以看出,原煤失重率比ISP大,两者在400~500℃温度段内出现的第二个失重速率峰,其中WSBC在450℃失重速率达到最大,而ISP最大失重速率所对应温度向右移动(480℃),两样品在第二个失重峰温度区间内的热解反应最为剧烈,归属于有机质的热裂解和大量挥发。Py-GC/MS结果表明,WSBC与ISP在450℃热解产物中可检测的化合物均以脂肪烃和含氧化合物为主,醇解使含氧化合物明显下降,但是对ISP中含氮类化合物脱除不明显。

关键词：次烟煤醇解组成与结构特征快速热解气相色谱/质谱

Effect of Ball-Milling Time on the Performance of Ni-Al2O3 Catalyst for 1,4-Butynediol Hydrogenation to Produce 1,4-Butenediol

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China Petroleum Processing & Petrochemical Technology 2020年第1期22卷 78-86页

作者： Gao Xianlong mo wenlong Ma Fengyun He Xiaoqiang Key Laboratory of Coal Clean Conversion&Chemical Engineering Process(Xinjiang Uyghur Autonomous Region) College of Chemistry and Chemical EngineeringXinjiang UniversityUrumqi 830046

The Ni-Al2O3 catalyst was prepared by the mechanochemical method in combination with a planetary ballmilling *** of milling time on the crystal structure,the reduction characteristics and the catalytic performance of Ni-Al2O3 catalyst for hydrogenation of 1,4-butynediol to produce 1,4-butenediol were *** catalysts were characterized by PSD,EDX,XRD,H2-TPR,BET,TEM,and NH3-TPD *** showed that the MCt2.5 catalyst treated at a ball milling time of 2.5 h could form a smallest particle size of 191.0 *** evaluation experiments revealed that the activity of the prepared catalyst increased at first and then reached a constant value with the extension of ballmilling *** BYD conversion,BED selectivity and yield on the MCt2.5 catalyst reached 35.63%,33.48%and 32.46%,respectively,which were higher than those obtained by other *** excellent performance of MCt2.5 sample is mainly related to the following three reasons from characterization ***,it has a smallest particle size of 191.0 nm;and then,the surface acidity(in terms of strong acids)of the catalyst was weaker than other catalysts;and eventually,the loading amount(23.84%)of the active component Ni exceeded the theoretical value(20%).

关键词： mechanochemical method Ni-Al2O3 catalyst 1 4-butynediol ball-milling time

Enhanced visible light absorption of Bi_(2)WO_(6)/SiO_(2) with abundant adsorbed oxygen for the degradation of organic pollutant

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Particuology 2024年第5期88卷 210-217页

作者： Yuanting Wu Xiaoying Wang wenlong Zhong Shan Zhang School of Material Science and Engineering Shaanxi University of Science and TechnologyXi'an 710021China

Heterogeneous photocatalysts exhibit high catalytic efficiency in the degradation of pollutants,but their stability and repeatability is not very good and requires high structural *** by nanosizing the pure Bi_(2)WO_(6)(BWO)photocatalyst without constructing a heterojunction,there is a significant improvement in its performance,with an enhancement effect of about 2.3 times(99.43%).The high photocatalytic degradation efficiency of the material can be attributed to the enhanced light absorption effect brought by the three-dimensional inverse-opal structure SiO_(2)(IS)and the abundant surface adsorbed oxygen generated after the formation of Si–O–W *** addition,the introduction of IS greatly increases the surface area of nanostructured BWO,which accelerates the charge transfer process,while the adsorbed oxygen promotes the participation of·O^(2−) in the photocatalytic reaction,thereby accelerating the consumption of photo-generated electrons and ultimately improving the separation of charge ***,the matched photonic bandgap further improves the absorption and utilization of light of the *** this work,we constructs Si–O–W bonds to obtain inverse-opal SiO_(2)/Bi_(2)WO_(6) with uniformly growth of pure phase nano BWO,which provides a feasible strategy for the preparation of high-performance pure-phase photocatalysts.

关键词： Bi_(2)WO_(6) SiO_(2) inverse-opal structure Photocatalysis Adsorbed oxygen

Experimental investigation on weak shock wave mitigation characteristics of flexible polyurethane foam and polyurea

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Defence Technology（防务技术） 2024年第1期31卷 179-191页

作者： Shiyu Jia Cheng Wang wenlong Xu Dong Ma Fangfang Qi State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China Institute for Advanced Technology Shandong UniversityJinan250061China

In recent years,explosion shock wave has been considered as a signature injury of the current military *** strong shock wave is lethal to the human body,weak shock wave can cause many more lasting *** investigate the protection ability and characteristics of flexible materials and structures under weak shock wave loading,the blast wave produced by TNT explosive is loaded on the polyurethane foam with the density of 200.0 kg/m3(F-200)and 400.0 kg/m3(F-400),polyurea with the density of 1100.0 kg/m^(3)(P-1100)and structures composed of the two materials,which are intended for individual *** results indicate that the shock wave is attenuated to weak pressure disturbance after interacting with the flexible materials which are not *** shock wave protective capability of single-layer materials is dependent on their thickness,density and microscopic *** overpressure,maximum pressure rise rate and impulse of transmitted wave decrease exponentially with increase in sample *** the same thickness,F-400 provides better protective capability than F-200 while P-1100 shows the best protective capability among the three *** this study,as the materials are not destroyed,F-200 with a thickness more than10.0 mm,F-400 with a thickness more than 4.0 mm,and P-1100 with a thickness more than 1.0 mm can attenuate the overpressure amplitude more than 90.0%.Further,multi-layer flexible composites are *** layer layouts of designed structures and layer thickness of the single-layer materials can affect the protective *** the research range,the structure in which polyurea is placed on the impact side shows the optimal shock wave protective performance,and the thicknesses of polyurea and polyurethane foam are 1.0 mm and 4.0 mm *** overpressure attenuation rate reached maximum value of 93.3%and impulse attenuation capacity of this structure are better than those of s

关键词： Free-field explosion Weak shock wave mitigation Polyurea Polyurethane foam Multi-layered composites

Chemical vapor deposition making better lithium-sulfur batteries

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Science Bulletin 2024年第13期69卷 2013-2016页

作者： Yingze Song Lixian Song Menglei Wang wenlong Cai State Key Laboratory of Environment-Friendly Energy Materials School of Materials and ChemistrySouthwest University of Science and TechnologyMianyang 621010China School of Material Science and Engineering Henan University of TechnologyZhengzhou 450001China Department of Advanced Energy Materials College of Materials Science and EngineeringSichuan UniversityChengdu 610064China

The burgeoning demand for modern electronic devices and electric vehicles has driven the development of efficient,reliable,and environmentally friendly batteries[1,2].Lithium–sulfur(Li–S)batteries with high theoretical capacity(1672 mA h g1)and energy density(2600 W h kg1),have garnered significant interest in both academic and industrial research[3,4].However,the widespread production and commercialization of Li–S batteries are impeded by the inherent characteristics of sulfur and lithium,along with their complex electrochemical ***,challenges such as the polysulfide shuttle effect and the slow kinetics of the sulfur nucleation/decomposition reaction hinder capacity utilization and cycling *** overcome these challenges,innovative electrocatalyst strategies aimed at enhancing activity have been explored.

关键词： lithium overcome cycling

Disturbances rejection optimization based on improved two-degree-of-freedom LADRC for permanent magnet synchronous motor systems

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Defence Technology（防务技术） 2024年第3期33卷 518-531页

作者： Chenggang Wang Jianhu Yan wenlong Li Liang Shan Le Sun School of Automation Nanjing University of Science and TechnologyNanjing 210094China

Permanent magnet synchronous motor(PMSM)speed control systems with conventional linear active disturbance rejection control(CLADRC)strategy encounter issues regarding the coupling between dynamic response and disturbance suppression and have poor performance in suppressing complex nonlinear *** order to address these issues,this paper proposes an improved two-degree-of-freedom LADRC(TDOF-LADRC)strategy,which can enhance the disturbance rejection performance of the system while decoupling entirely the system's dynamic and anti-disturbance performance to boost the system robustness and simplify controller parameter *** models that consider total disturbances are developed to design the TDOF-LADRC speed controller ***,to evaluate the control performance of the TDOF-LADRC strategy,its stability is proven,and the influence of each controller parameter on the system control performance is *** on it,a comparison is made between the disturbance observation ability and anti-disturbance performance of TDOF-LADRC and CLADRC to prove the superiority of TDOF-LADRC in rejecting ***,experiments are performed on a 750 W PMSM experimental platform,and the results demonstrate that the proposed TDOF-LADRC exhibits the properties of two degrees of freedom and improves the disturbance rejection performance of the PMSM system.

关键词： Permanent magnet synchronous motor(PMSM) Active disturbance rejection control(ADRC) Disturbance observer Two-degree-of-freedom control Anti-disturbance

Study on force chain evolution of rice straw with different length during vibrational compression

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Particuology 2024年第2期85卷 310-322页

作者： Han Tang wenlong Xu Guixuan Zhu Changsu Xu Jinwu Wang College of Engineering Northeast Agricultural UniversityHarbin150030China

This paper explores the mechanism of force chain evolution and voidage change under vibrational and non-vibrational compression conditions of rice straw of different *** were used to explore the force chain evolution and voidage variation mechanism under different *** re-sults show that under non-vibrational compression,the strong force chain passes from top to bottom in vertical direction and from center to periphery in tangential *** vibrational compression,the force chain passes from top and bottom to center in vertical direction and the force chain evolves from outer ring to interior and exterior in tangential *** number of strong chains,voidage and standard deviation of the mean pressure under vibratory compression are lower than the values under non-vibratory *** promotes stress transfer and enhancement,velocity enhancement and density *** study analyzes the mechanical properties of different lengths straw during vibrational and non-vibrational compression from a detailed viewpoint.

关键词： Straw compression Voidage Discrete element method Mechanical properties Force chain transmission