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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

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

Small tracking error correction for moving targets of intelligent electro-optical detection systems

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Frontiers of Mechanical Engineering 2024年第2期19卷 29-44页

作者： Cheng SHEN Zhijie WEN wenliang zhu Dapeng FAN Mingyuan LING College of Intelligence Science and Technology National University of Defense TechnologyChangsha 410073China

Small tracking error correction for electro-optical systems is essential to improve the tracking precision of future mechanical and defense *** threats,such as“low,slow,and small(LSS)”moving targets,pose increasing challenges to *** core goal of this work is to address the issues,such as small tracking error correction and aiming control,of electro-optical detection systems by using mechatronics drive modeling,composite velocity–image stability control,and improved interpolation filter design.A tracking controller delay prediction method for moving targets is proposed based on the Euler transformation model of a two-axis,two-gimbal cantilever beam coaxial *** tracking error formation is analyzed in detail to reveal the scientific mechanism of composite control between the tracking controller’s feedback and the motor’s velocity–stability *** improved segmental interpolation filtering algorithm is established by combining line of sight(LOS)position correction and multivariable typical tracking fault ***,a platform with 2 degrees of freedom is used to test the *** LSS moving target shooting object with a tracking distance of S=100 m,target board area of A=1 m^(2),and target linear velocity of v=5 m/s is *** show that the optimal method’s distribution probability of the tracking error in a circle with a radius of 1 mrad is 66.7%,and that of the traditional method is 41.6%.Compared with the LOS shooting accuracy of the traditional method,the LOS shooting accuracy of the optimized method is improved by 37.6%.

关键词： electro-optical detection system small tracking error moving target visual servo aiming contro

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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甲缩醛歧化制甲酸甲酯的全新路线研究

应用化工 2025年第1期54卷 1-6,11页

作者：杨磊磊陈之旸倪友明刘红超朱文良中国科学院大连化学物理研究所辽宁大连116023 中国科学院大学北京100049

提出了一个负载型杂多酸催化甲缩醛歧化制甲酸甲酯的新策略,并通过系统研究载体、杂多酸类型以及酸量对甲缩醛歧化性能的影响,验证了新策略具有可行性。研究发现,杂多酸在载体表面的分散性是影响催化剂性能的重要因素。其中SiO_(2)和HP... 详细信息

提出了一个负载型杂多酸催化甲缩醛歧化制甲酸甲酯的新策略,并通过系统研究载体、杂多酸类型以及酸量对甲缩醛歧化性能的影响,验证了新策略具有可行性。研究发现,杂多酸在载体表面的分散性是影响催化剂性能的重要因素。其中SiO_(2)和HPW分别是实现甲缩醛高效转化的优良载体以及活性物种。更为重要的是,酸性质特别是酸量对甲缩醛的转化具有重要影响,在保证良好分散性的前提下,通过提高杂多酸负载量进而增加酸量有利于甲缩醛转化。在P=0.1 MPa,T=373 K,WHSV_(DMM)=2 g/(g_(cat)·h)的条件下,30%HPW/SiO_(2)催化剂表现出最佳的反应性能,甲缩醛的转化率以及甲酸甲酯的时空产率分别为93.9%以及0.71 g/(g_(cat)·h)。为替代传统工业生产方法,开发绿色、高效甲酸甲酯合成新路线提供了重要的理论支撑,具有重要的工业应用前景。

关键词：杂多酸甲缩醛甲酸甲酯歧化

Insights into the size effect of ZnCr_(2)O_(4)spinel oxide in composite catalysts for conversion of syngas to aromatics

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Green Energy & Environment 2023年第2期8卷 530-537页

作者： Yi Fu Youming Ni Wenhao Cui Xudong Fang Zhiyang Chen Zhaopeng Liu wenliang zhu Zhongmin Liu National Engineering Laboratory for Methanol to Olefins Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023LiaoningChina University of Chinese Academy of Sciences Beijing100049China

Direct conversion of syngas to aromatics(STA)over oxide-zeolite composite catalysts is promising as an alternative method for aromatics ***,the structural effect of the oxide component in composite catalysts is still ***,we investigate the size effect by selecting ZnCr_(2)O_(4)spinel,as a probe oxide,mixing with H-ZSM-5 zeolite as a composite catalyst for STA *** CO conversion,aromatics selectivity and space-time yield(STY)of aromatics are all significantly improved with the crystal size of ZnCr_(2)O_(4)oxide decreases,which can mainly attribute to the higher oxygen vacancy concentration and thus the rapid generation of more C1oxygenated intermediate *** on the understanding of the size-performance relationship,ZnCr_(2)O_(4)-400 with a smaller size mixing with H-ZSM-5 can achieve32.6%CO conversion with 76%aromatics *** STY of aromatics reaches as high as 4.79 mmol g_(cat)^(-1)h^(-1),which outperforms the previously reported some typical *** study elucidates the importance of regulating the size of oxide to design more efficient oxidezeolite composite catalysts for conversion of syngas to value-added chemicals.

关键词： Size effect Syngas conversion Aromatics ZnCr_(2)O_(4)oxide H-ZSM-5 zeolite

A dual-bed catalyst for producing ethylene and propylene from syngas

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Journal of Energy Chemistry 2022年第3期31卷 190-194,I0006页

作者： Youming Ni Zhaopeng Liu Peng Tian Zhiyang Chen Yi Fu 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

Ethylene and propylene(C_(2)^(–)3=)are the two most demanded olefin products,which are mainly produced by thermal and catalytic cracking of petroleum-derived hydrocarbons now[1].With the depletion of petroleum resour... 详细信息

关键词： Syngas Dual-bed Ethylene Propylene SAPO-34

Large transverse thermoelectric figure of merit in a topological Dirac semimetal

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Science China(Physics,Mechanics & Astronomy) 2020年第3期63卷 82-88页

作者： JunSen Xiang SiLe Hu Meng Lyu wenliang zhu ChaoYang Ma ZiYu Chen Frank Steglich GenFu Chen PeiJie Sun Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Department of Physics Key Laboratory of Micro-Nano Measurement-Manipulation and PhysicsBeihang UniversityBeijing 100191China University of Chinese Academy of Sciences Beijing 100049China Max Planck Institute for Chemical Physics of Solids Dresden 01187Germany Songshan Lake Materials Laboratory Dongguan 523808China

The Seebeck effect encounters a few fundamental constraints hindering its thermoelectric(TE)conversion *** notably,there are the charge compensation of electrons and holes that diminishes this effect,and the Wiedemann-Franz(WF)law that makes independent optimization of the corresponding electrical and thermal conductivities ***,we demonstrate that in the topological Dirac semimetal Cd3As2 the Nernst effect,i.e.,the transverse counterpart of the Seebeck effect,can generate a large TE figure of merit *** room temperature,zNT≈0.5 in a small field of 2 T and it significantly surmounts its longitudinal counterpart for any field.A large Nernst effect is generically expected in topological semimetals,benefiting from both the bipolar transport of compensated electrons and holes and their high *** this case,heat and charge transport are orthogonal,i.e.,not intertwined by the WF law *** importantly,further optimization of zNT by tuning the Fermi level to the Dirac node can be anticipated due to not only the enhanced bipolar transport,but also the anomalous Nernst effect arising from a pronounced Berry curvature.A combination of the topologically trivial and nontrivial advantages promises to open a new avenue towards high-efficient transverse thermoelectricity.

关键词： Dirac semimetal Cd3As2 Nernst effect transverse thermoelectricity