Active species loss owing to reactant stream washing is a general problem which industrial catalysts suffer from.In case of catalysts synthesized by co-precipitation method,which have active species unused in bulk pha...Active species loss owing to reactant stream washing is a general problem which industrial catalysts suffer from.In case of catalysts synthesized by co-precipitation method,which have active species unused in bulk phase,can be regenerated by a simple thermal treatment that leads to active species in bulk phase migration to surface of the deactivated catalysts.In this work,the influence of regeneration temperature was investigated by employing ammonium hydroxide washing to simulate reactant stream washing of CeCoxO2 catalysts for NO+CO reaction.It is found that the deactivated catalyst can be regenerated by simple thermal treatment and increasing calcination temperature could accelerate the Co species migration from the bulk phase to surface of catalysts.展开更多
With development of miniaturization,high integration,multifunction and high efficiency of electronic packaging technology,a higher requirement for soldering material and its enlistment property is needed.It is easily ...With development of miniaturization,high integration,multifunction and high efficiency of electronic packaging technology,a higher requirement for soldering material and its enlistment property is needed.It is easily subjected to reliability failure for electronic products or components packaged with micro/nanoelectronic packaging technology.In this paper,research process and some typical failure mechanisms on interconnect solder point reliability are discussed,including electro-migration （EM）,thermal migration （TM）,K-cavity,corrosion,electrochemical migration （ECM） and whisker growth,etc.It provides the basic data for the new generation of micro/nano-packaging technique to improve the fine-pitch jointing reliability.展开更多
基金Project supported by the Opening Foundation of Jiangsu Key Laboratory of Vehicle Emissions Control(OVEC041)Major Scientific and Technological Project of Bingtuan(2018AA002)。
文摘Active species loss owing to reactant stream washing is a general problem which industrial catalysts suffer from.In case of catalysts synthesized by co-precipitation method,which have active species unused in bulk phase,can be regenerated by a simple thermal treatment that leads to active species in bulk phase migration to surface of the deactivated catalysts.In this work,the influence of regeneration temperature was investigated by employing ammonium hydroxide washing to simulate reactant stream washing of CeCoxO2 catalysts for NO+CO reaction.It is found that the deactivated catalyst can be regenerated by simple thermal treatment and increasing calcination temperature could accelerate the Co species migration from the bulk phase to surface of catalysts.
基金Supported by the National Natural Science Foundation of China (51171068)the Vital Fund from Hubei Provincial Department of Education (C2010071)the Fund of the Vital Subject Program on Applied Chemistry in Hubei University of Education
文摘With development of miniaturization,high integration,multifunction and high efficiency of electronic packaging technology,a higher requirement for soldering material and its enlistment property is needed.It is easily subjected to reliability failure for electronic products or components packaged with micro/nanoelectronic packaging technology.In this paper,research process and some typical failure mechanisms on interconnect solder point reliability are discussed,including electro-migration （EM）,thermal migration （TM）,K-cavity,corrosion,electrochemical migration （ECM） and whisker growth,etc.It provides the basic data for the new generation of micro/nano-packaging technique to improve the fine-pitch jointing reliability.
