Nitrided hierarchical porous ZSM-5 was synthesized by nitridation of hierarchical porous ZSM-5 with flowing ammonia at elevated temperature.The samples were characterized by XRD,SEM,Nitrogen sorption isotherms,NH3-TPD...Nitrided hierarchical porous ZSM-5 was synthesized by nitridation of hierarchical porous ZSM-5 with flowing ammonia at elevated temperature.The samples were characterized by XRD,SEM,Nitrogen sorption isotherms,NH3-TPD and Py-IR,and evaluated in alkylation of benzene and methanol.The result indicated that the high specific surface area of parent ZSM-5 was maintained,while the Bronsted acidity was effectively adjusted by nitridation.Moreover,the high suppression of ethylbenzene was observed on nitrided catalyst and this could be attributed to the decrease of Bronsted acidity which suppressed the methanol to olefins reactions.展开更多
Intertrochanteric fractures have become a severe public health problem in elderly patients.Proximal femoral nail anti-rotation(PFNA)is a commonly used intramedullary fixation device for unstable intertrochanteric frac...Intertrochanteric fractures have become a severe public health problem in elderly patients.Proximal femoral nail anti-rotation(PFNA)is a commonly used intramedullary fixation device for unstable intertrochanteric fractures.Pelvic perforation by cephalic screw is a rare complication.We reported an 84-year-old female who fell at home and sustained an intertrochanteric fracture.The patient underwent surgery with PFNA as the intramedullary fixation device.Routine postoperative examination revealed medial migration of the helical blade that eventually caused pelvic perforation.We performed a cemented total hip arthroplasty as the savage procedure.At the latest follow-up of 12 months after total hip arthroplasty,the patient had no pain or loosening of the prosthesis in the left hip.Pelvic perforation should be considered when choosing PFNA as the intramedullary fixation device,especially in patients with severe osteoporosis wherein the helical blade can be easily inserted during the operation.The lack of devices to avoid oversliding of the helical blade in PFNA is an unreported cause of this complication and should be considered in such cases.展开更多
基金the National Natural Science Foundation of China (Nos. 21476207 and 21506189)Zhejiang Postdoctoral Research Funded Projects (No. BSH1502147)National Basic Research Program of China (973 Program, No. 2011CB710800)
文摘Nitrided hierarchical porous ZSM-5 was synthesized by nitridation of hierarchical porous ZSM-5 with flowing ammonia at elevated temperature.The samples were characterized by XRD,SEM,Nitrogen sorption isotherms,NH3-TPD and Py-IR,and evaluated in alkylation of benzene and methanol.The result indicated that the high specific surface area of parent ZSM-5 was maintained,while the Bronsted acidity was effectively adjusted by nitridation.Moreover,the high suppression of ethylbenzene was observed on nitrided catalyst and this could be attributed to the decrease of Bronsted acidity which suppressed the methanol to olefins reactions.
基金National Key R&D Program of China,2018YFF0301103,The funding body will support the publication fees without affecting the diagnosis and treatment of the patient and the writing of the manuscript.
文摘Intertrochanteric fractures have become a severe public health problem in elderly patients.Proximal femoral nail anti-rotation(PFNA)is a commonly used intramedullary fixation device for unstable intertrochanteric fractures.Pelvic perforation by cephalic screw is a rare complication.We reported an 84-year-old female who fell at home and sustained an intertrochanteric fracture.The patient underwent surgery with PFNA as the intramedullary fixation device.Routine postoperative examination revealed medial migration of the helical blade that eventually caused pelvic perforation.We performed a cemented total hip arthroplasty as the savage procedure.At the latest follow-up of 12 months after total hip arthroplasty,the patient had no pain or loosening of the prosthesis in the left hip.Pelvic perforation should be considered when choosing PFNA as the intramedullary fixation device,especially in patients with severe osteoporosis wherein the helical blade can be easily inserted during the operation.The lack of devices to avoid oversliding of the helical blade in PFNA is an unreported cause of this complication and should be considered in such cases.
