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Formaldehyde intermediate participating in the conversion of methanol to aromatics over zinc modified H-ZSM-5

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Journal of Energy Chemistry 2021年第3期30卷 174-178页

作者： Youming Ni wenliang zhu Zhongmin Liu National Engineering Laboratory for Methanol to Olefins Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

Metal-modified H-ZSM-5 has a high selectivity of aromatics in methanol to aromatics(MTA)reaction,which is often attributed to the metal promoting the aromatization of intermediate ***,the effect of methanol dehydrogenation on aromatics formation over these catalysts is rarely ***,we report that HCHO,which is formed by methanol dehydrogenation over Zn/H-ZSM-5 prepared by Zn impregnation,can participate in the synthesis of *** conversion can produce more aromatics than olefins(propylene or ethylene)conversion over Zn/H-ZSM-5,indicating the conventional MTA pathway including methanol-to-olefins and olefins-to-aromatics is not ***,an MTA mechanism including the conventional pathway and the methanol and HCHO coupling pathway is systematically proposed.

关键词： Methanol Formaldehyde Aromatics Zn H-ZSM-5

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城轨列车踏面制动温度场仿真分析与试验验证

铁道机车车辆 2024年第3期44卷 159-166页

作者：杨子杰朱文良孙宁远余朝刚上海工程技术大学城市轨道交通学院上海201620

城轨列车踏面制动过程中的温度变化直接影响到制动系统的可靠性和列车运行安全性,为了研究车轮温升关键参数以及材料属性对车轮踏面温度影响,基于ANSYS建立车轮有限元模型,采用均匀加载法在80 km/h紧急制动工况下分别讨论车轮和闸瓦比... 详细信息

城轨列车踏面制动过程中的温度变化直接影响到制动系统的可靠性和列车运行安全性,为了研究车轮温升关键参数以及材料属性对车轮踏面温度影响,基于ANSYS建立车轮有限元模型,采用均匀加载法在80 km/h紧急制动工况下分别讨论车轮和闸瓦比热容和导热系数以及4种不同计算方法求解得到的对流换热系数对车轮踏面温度的影响,考虑温度对车轮材料属性的影响,将实车采集的列车运行速度和制动减速度作为热流输入参数,车轮和闸瓦导热系数直接影响到车轮踏面温升,4种不同计算方法求解得到的对流换热系数对车轮踏面温度影响较小。模拟了制动初速度为80 km/h的3次连续紧急制动工况下车轮踏面温度分布,并将仿真结果与实车试验数据进行对比分析,验证了仿真结果的可靠性。

关键词：城轨列车制动温升有限元仿真试验验证

毛泽东关于胸怀天下重要论述的基本向度及启示

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山西高等学校社会科学学报 2024年第1期36卷 15-22页

作者：朱文良丁成际安徽大学马克思主义学院安徽合肥230601

在毛泽东关于胸怀天下重要论述的基本向度中,形成了“立场—基点—方式—目标”四位一体的逻辑架构。永不称霸是基本立场,回答了胸怀天下的方向问题;独立自主、自力更生为主的方针作为基本立足点,回答了胸怀天下的现实基础问题;支持世... 详细信息

在毛泽东关于胸怀天下重要论述的基本向度中,形成了“立场—基点—方式—目标”四位一体的逻辑架构。永不称霸是基本立场,回答了胸怀天下的方向问题;独立自主、自力更生为主的方针作为基本立足点,回答了胸怀天下的现实基础问题;支持世界被压迫民族的独立解放运动、开展反帝反霸斗争是实现方式,回答了胸怀天下的路径选择问题;消灭帝国主义,实现社会主义和共产主义构成了崇高目标,回答了胸怀天下的价值归宿问题。这些思想观点对于当前中国共产党推动构建人类命运共同体具有重要启示。

关键词：毛泽东胸怀天下人类进步事业全人类共同价值人类命运共同体

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Conversion of CO_(2) and H_(2) into propane over InZrO_(x) and SSZ-13 composite catalyst

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Journal of Energy Chemistry 2021年第3期30卷 111-117页

作者： Zhaopeng Liu Youming Ni Tantan Sun wenliang zhu Zhongmin Liu National Engineering Laboratory for Methanol to Olefins Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Dalian National Laboratory for Clean Energy Delian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

Direct converting carbon dioxide into hydrocarbon fuels and value-added chemicals would offer a very attractive approach for efficient utilization of CO_(2) as a carbon ***,olefins,aromatics and gasoline have been successfully synthesized by CO_(2) hydrogenation,highly selective conversion of CO_(2) and H_(2) into C_(2+)hydrocarbon is still challenging due to a high C-C coupling barrier and inhibiting the production of other long-chain ***,we report a composite catalyst made of InZrO_(x) and SSZ-13 molecular sieve(InZrO_(x)+SSZ-13),which exhibits 74.5% propane selectivity at 623 *** 8-MR micropores and the higher strength of the acid for SSZ-13 benefit the formation of *** with pure InO_(x) and m-ZrO_(2) the composite oxide InZrO_(x) containing more oxygen vacancies,exhibits to be more readily reduced by H_(2) and easier to adsorb and desorb CO_(2) within the reaction *** those could be beneficial to the activation and conversion of H_(2) and CO_(2).The catalytic performance of InZrO_(x)+SSZ-13 in CO_(2) hydrogenation provides a potential for production of propane.

关键词： CO_(2)hydrogenation InZrO_(x)+SSZ-13 Propane Oxygen vacancies Acid strength

Achieving high conversion of syngas to aromatics

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Journal of Energy Chemistry 2022年第3期31卷 597-602,I0016页

作者： Yi Fu Youming Ni Zhiyang Chen wenliang zhu Zhongmin Liu National Engineering Laboratory for Methanol to Olefins Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

Realizing high CO conversion and high aromatics selectivity simultaneously in syngas-to-aromatics(STA)reaction is still ***,we report a 57.5%CO conversion along with 74%aromatics selectivity over a composite catalyst consisting of Fe/ZnCr_(2)O_(4)(Fe modified ZnCr_(2)O_(4)spinel)oxide and H-ZSM-5 *** of only 3 wt%of Fe onto ZnCr_(2)O_(4)can remarkably increase CO conversion without sacrificing the aromatics *** vacancy concentration is improved after impregnating *** highly dispersed iron carbide species is formed during the reaction over Fe/ZnCr_(2)O_(4)spinel *** synergistic effect of oxygen vacancy and iron carbide results in a rapid formation of abundant oxygenated intermediate species,which can be continuously transformed to aromatics in *** study provides a new insight into the design of highly efficient catalyst for syngas conversion.

关键词： Syngas Aromatics Fe/ZnCr_(2)O_(4)oxide H-ZSM-5 zeolite High conversion

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温度效应对浮选起泡剂汽化成泡特征影响

煤炭工程 2024年第5期56卷 195-201页

作者：朱宏政吴念刚赵兵兵史苘桧张勇朱文亮朱金波闵凡飞安徽理工大学材料科学与工程学院安徽淮南232001 中煤科工集团北京华宇工程有限公司北京100120

起泡剂汽化成泡法可以解决传统起泡剂添加方式存在的无选择性吸附等弊端,利用高速运动采集系统分析了仲辛醇、甲基异丁基甲醇(MIBC)和空气分别在不同汽化温度下成泡的热/动力学特征。研究表明,随汽化温度升高,气泡宽纵比逐渐增大,气泡... 详细信息

起泡剂汽化成泡法可以解决传统起泡剂添加方式存在的无选择性吸附等弊端,利用高速运动采集系统分析了仲辛醇、甲基异丁基甲醇(MIBC)和空气分别在不同汽化温度下成泡的热/动力学特征。研究表明,随汽化温度升高,气泡宽纵比逐渐增大,气泡的体积逐渐减小,不同药剂汽化成泡体积由大到小为空气>仲辛醇>MIBC,气泡表面张力和附加压力随汽化温度升高而降低是气泡宽纵比和体积变化的主因。气泡上浮末速随汽化温度升高而减小,且到达稳定末速的时间缩短。气泡动能随温度升高而降低,相同汽化温度下,仲辛醇汽化成泡的动能大于MIBC,气泡的表面能、动能与势能之和随汽化温度升高而减小。

关键词：浮选气泡起泡剂温度效应表面能气泡动能

Catalytic activity of Cu/ZnO catalysts mediated by MgO promoter in hydrogenation of methyl acetate to ethanol

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Journal of Energy Chemistry 2021年第10期30卷 203-209,I0006页

作者： Fang Zhang Zhiyang Chen Xudong Fang Hongchao Liu Yong Liu wenliang zhu National Engineering Laboratory for Methanol to Olefins Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

Hydrogenation of methyl acetate is a key step in ethanol synthesis from dimethyl ether carbonylation and Cu-based catalysts are widely *** report here that the hydrogenation activity of Cu/ZnO catalysts can be enhanced by the addition of MgO *** evolution of crystal phases during coprecipitation and the physicochemical properties of calcined and reduced catalysts by X-ray diffraction(XRD),thermogravimetric(TG)-mass spectrometry(MS),Brunauer-Emmett-Teller(BET),transmission electron microscopy(TEM),N_(2)O titration,in situ CO-Fourier transform infrared spectroscopy(FTIR)and H_(2)-temperature programmed reduction(H_(2)-TPR)reveal that the promoter effect likely lies in the presence of Mg^(2+).A proper amount of Mg^(2+)mediates the precipitation process of Cu and Zn,leading to preferable formation of aurichalcite(Cu_(x)Zn_(1-x))5(CO_(3))_(2)(OH)_(6) crystal phase and a small amount of basic carbonates such as hydrozincite Zn_(5)(CO_(3))_(2)(OH)_(6) and malachite Cu_(2) CO_(3)(OH)_(2).The presence of aurichalcite strengthens the interaction between Cu and Zn species,and thus enhances the dispersity of CuO species and helps generation of Cu^(+)species on reduced ***,the performance of Cu/ZnO catalysts exhibits an optimal dependence on the Mg loading,i.e.,17.5%.However,too much Mg^(2+)in the precipitation liquid prohibits formation of aurichalcite but enhances formation of basic nitrates,leading to a dramatically reduced hydrogenation *** findings may find applications for optimization of other Cu-based catalysts in a wider range of hydrogenation reactions.

关键词： Methyl acetate Hydrogenation Cu/ZnO catalyst MgO promoter Precursor effect Aurichalcite

Highly converting syngas to lower olefins over a dual-bed catalyst

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Journal of Energy Chemistry 2021年第7期30卷 573-576页

作者： Zhaopeng Liu Youming Ni Xudong Fang wenliang zhu Zhongmin Liu National Engineering Laboratory for Methanol to Oleﬁns Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

Light olefins (C2–C4olefins) are the most important basic carbon-based building blocks, which are mainly produced from the catalytic cracking of naphtha [1–3]. With the rapid depletion of oil reserves and the growing demand for lower olefins, there is an urgent need to develop an alternative technique for producing them from non-petroleum resources such as coal, natural gas, or biomass. Currently, coal has been successfully transformed to olefins in China via the combination of the processes of coal-tosyngas, syngas-to-methanol and methanol-to-olefins [4–6]. In order to further improve efficiency and reduce investment, the direct conversion of syngas to olefins has received extensive attention in recent years [7].

关键词： Syngas Olefins Dual-bed SAPO-34 Dimethyl ether

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地铁车辆异步电机仿真与直接转矩控制研究

物流科技 2024年第5期47卷 51-54页

作者：刘国栋余朝刚朱文良上海工程技术大学城市轨道交通学院上海201620

电力牵引系统是地铁列车运行与制动的核心部分,牵引电机主要采用三相交流异步电机进行控制,控制方法多样。为验证直接转矩控制法在牵引电机中的控制效果,在MATLAB/Simulink仿真设计中采用DTC控制牵引电机的转速,进而控制轨道车辆的车速... 详细信息

电力牵引系统是地铁列车运行与制动的核心部分,牵引电机主要采用三相交流异步电机进行控制,控制方法多样。为验证直接转矩控制法在牵引电机中的控制效果,在MATLAB/Simulink仿真设计中采用DTC控制牵引电机的转速,进而控制轨道车辆的车速,完成地铁电力牵引系统的建模。仿真过程中定子电流正弦曲线规律、定子磁链收敛为规整圆形、转矩控制及时响应,牵引电机稳定运行。仿真结果表明,采用直接转矩控制法使得城市轨道交通牵引系统具有良好的控制性能。

关键词：轨道车辆 Simulink 电力牵引直接转矩控制