The biomass valorization is of great importance as an alternative for the production of transport fuels and fine chemicals.Furfural hydrogenation to furfuryl alcohol is a prevailing industrial route for the utilizatio...The biomass valorization is of great importance as an alternative for the production of transport fuels and fine chemicals.Furfural hydrogenation to furfuryl alcohol is a prevailing industrial route for the utilization of hemicellulose component of biomass.The toxicity of the chromium species in commercial copper chromite catalyst for furfuryl alcohol production motivates the development of efficient chromium-free catalyst.Thus,a highly efficient silica supported copper catalyst is developed in this study.The catalyst is prepared by freeze drying of a gel precursor that is synthesized by ammonia evaporation,followed by calcination and H_(2)reduction.The catalyst exhibits higher furfural hydrogenation activity than oven dried catalyst,commercial copper chromite catalyst and a plant supplied commercial silica supported copper catalyst.The catalyst also shows good stability.The superior performance of the freeze dried catalyst has resulted from its developed pore structure and higher amount of Cu^(0)as well as Cu^(+)active sites.展开更多
Methanl dehydrogenation over CU/SiO2 prepared by different method was investigated in a fixed-bed reactor TPR was used to cbaracterize the reduction property of the catalysts.Experimental results showed tha catalysts ...Methanl dehydrogenation over CU/SiO2 prepared by different method was investigated in a fixed-bed reactor TPR was used to cbaracterize the reduction property of the catalysts.Experimental results showed tha catalysts with differen initial structure exhibited different catalytic behavior in methanol dshydrogenation. With the reaction going on the activity and selecivity of methyl formate and CO decreased and the selectivity of formaldehyde increased due to the sintering and carbon deposition on the surface.展开更多
随着摩尔定律推进至纳米级节点,以硅通孔(TSV)、重布线层(RDL)、薄芯片堆叠键合等为支撑的三维集成被认为是延续摩尔定律的重要途径.Cu/SiO_(2)混合键合可以持续缩小芯片间三维互连节距、增大三维互连密度,是芯片堆叠键合前沿技术.近年...随着摩尔定律推进至纳米级节点,以硅通孔(TSV)、重布线层(RDL)、薄芯片堆叠键合等为支撑的三维集成被认为是延续摩尔定律的重要途径.Cu/SiO_(2)混合键合可以持续缩小芯片间三维互连节距、增大三维互连密度,是芯片堆叠键合前沿技术.近年来它在互补金属氧化物半导体(CMOS)图像传感器(CIS)、Xtacking 3D NAND、2.5D/3D集成等商业化应用突破,使之成为国内外领先半导体研究机构研究关注的热点话题.本文将系统梳理混合键合技术的研究历史与产业应用现状,重点分析近年来国内外代表性研究工作的技术路线、研究方法、关键问题等,在此基础上,对混合键合技术的未来发展方向进行展望.展开更多
基金supported by the National Natural Science Foundation of China (Nos.21721004,21808217,21932005)Natural Science Foundation of Liaoning Province (No.2020-MS-018)+1 种基金Dalian Young Star of Science and Technology Project (No.2020RQ023)Dalian Institute of Chemical Physics (Nos.DICP ZZBS201812,DICPI201936)。
文摘The biomass valorization is of great importance as an alternative for the production of transport fuels and fine chemicals.Furfural hydrogenation to furfuryl alcohol is a prevailing industrial route for the utilization of hemicellulose component of biomass.The toxicity of the chromium species in commercial copper chromite catalyst for furfuryl alcohol production motivates the development of efficient chromium-free catalyst.Thus,a highly efficient silica supported copper catalyst is developed in this study.The catalyst is prepared by freeze drying of a gel precursor that is synthesized by ammonia evaporation,followed by calcination and H_(2)reduction.The catalyst exhibits higher furfural hydrogenation activity than oven dried catalyst,commercial copper chromite catalyst and a plant supplied commercial silica supported copper catalyst.The catalyst also shows good stability.The superior performance of the freeze dried catalyst has resulted from its developed pore structure and higher amount of Cu^(0)as well as Cu^(+)active sites.
文摘Methanl dehydrogenation over CU/SiO2 prepared by different method was investigated in a fixed-bed reactor TPR was used to cbaracterize the reduction property of the catalysts.Experimental results showed tha catalysts with differen initial structure exhibited different catalytic behavior in methanol dshydrogenation. With the reaction going on the activity and selecivity of methyl formate and CO decreased and the selectivity of formaldehyde increased due to the sintering and carbon deposition on the surface.
文摘随着摩尔定律推进至纳米级节点,以硅通孔(TSV)、重布线层(RDL)、薄芯片堆叠键合等为支撑的三维集成被认为是延续摩尔定律的重要途径.Cu/SiO_(2)混合键合可以持续缩小芯片间三维互连节距、增大三维互连密度,是芯片堆叠键合前沿技术.近年来它在互补金属氧化物半导体(CMOS)图像传感器(CIS)、Xtacking 3D NAND、2.5D/3D集成等商业化应用突破,使之成为国内外领先半导体研究机构研究关注的热点话题.本文将系统梳理混合键合技术的研究历史与产业应用现状,重点分析近年来国内外代表性研究工作的技术路线、研究方法、关键问题等,在此基础上,对混合键合技术的未来发展方向进行展望.
