NF_(3)is commonly used as an etching and cleaning gas in semiconductor industry,however it is a strongly greenhouse gas.Therefore,the destruction of disposal NF_(3)is an urgent task to migrate the greenhouse effect.Am...NF_(3)is commonly used as an etching and cleaning gas in semiconductor industry,however it is a strongly greenhouse gas.Therefore,the destruction of disposal NF_(3)is an urgent task to migrate the greenhouse effect.Among the technologies for NF_(3)abatement,the destructive sorption of NF_(3)over metal oxides sorbents is an effective way.Thus,the search for a highly reactive and utilized sorbent for NF_(3)destruction is in great demand.In this work,AlOOH supported on carbon-sphere(AlOOH/CS)as precursors were synthesized hydrothermally and heat-treated to prepare the Al_(2)O_(3)sorbents.The influence of AlOOH/CS hydrothermal temperatures on the reactivity of derived Al_(2)O_(3)sorbents for NF_(3)destruction was investigated,and it is shown that the Al2O3 from AlOOH/CS hydro-thermalized at 120℃is superior to others.Subsequently,the optimized Al_(2)O_(3)was covered by Mn(OH)x to prepare Mn/Al_(2)O_(3)sorbents via changing hydrothermal temperatures and Mn loadings.The results show that the Mn/Al_(2)O_(3)sorbents are more utilized than bare Al_(2)O_(3)in NF_(3)destructive sorption due to the promotional effect of Mn_(2)O_(3)as surface layer on the fluorination of Al_(2)O_(3)as substrate,especially the optimal 5%Mn/Al2O3(160℃)exhibits a utilization percentage as high as 90.4%,and remarkably exceeds all the sorbents reported so far.These findings are beneficial to develop more efficient sorbents for the destruction of NF_(3).展开更多
为解决焦化废水尾水中有机物难降解问题,采用浸渍-煅烧法制备了负载活性金属氧化物的活性氧化铝型催化剂,通过臭氧催化氧化实验探索了载体和活性组分种类对COD去除率的影响,并对去除效率最高效的催化剂进行了表征分析。结果表明:BET分...为解决焦化废水尾水中有机物难降解问题,采用浸渍-煅烧法制备了负载活性金属氧化物的活性氧化铝型催化剂,通过臭氧催化氧化实验探索了载体和活性组分种类对COD去除率的影响,并对去除效率最高效的催化剂进行了表征分析。结果表明:BET分析发现Mn-Ni/γ-Al_(2)O_(3)(n_(Mn)∶n_(Ni)=2∶1)保留了γ-Al_(2)O_(3)的介孔结构,具有较大的表面积和孔体积,但负载后催化剂的比表面积和孔体积都有所降低,孔径变大;XPS和XRD分析发现锰主要以α-MnO_(2)形式存在,镍主要以复合价态存在,且二者存在强烈的相互作用;煅烧温度为450℃,煅烧时间为4 h,活性氧化铝载体催化活性最高;单组分催化剂相比于多组分催化剂,催化活性较低,其中Mn-Ni/γ-Al_(2)O_(3)的催化活性最好,60 min COD的去除率能达到43.26%,且重复使用6次后,COD的去除率仍达35.65%,催化活性仅降低17.60%,且Mn和Ni溶出量较低,表明催化剂具有良好的稳定性和重复使用性。展开更多
研究T6处理、深冷处理和T6+深冷处理对ZCuAl 10 Fe 3Mn 2合金微观组织、力学性能以及在室温至450℃下的热疲劳行为。通过XRD,OM,SEM,EDS对合金组织和裂纹形貌进行观察分析。结果表明:T6+深冷复合处理工艺能够显著改善ZCuAl 10 Fe 3Mn 2...研究T6处理、深冷处理和T6+深冷处理对ZCuAl 10 Fe 3Mn 2合金微观组织、力学性能以及在室温至450℃下的热疲劳行为。通过XRD,OM,SEM,EDS对合金组织和裂纹形貌进行观察分析。结果表明:T6+深冷复合处理工艺能够显著改善ZCuAl 10 Fe 3Mn 2合金的力学性能和微观组织。与T6处理相比,其抗拉强度、硬度以及伸长率分别提高了7.28%,16.96%和23.53%;其α相进一步细化且分布更加均匀,位错密度增加,使得合金整体的组织均匀性、致密性更好。综合性能的提高也有效地提高了合金的热疲劳性能,其抗热应力和氧化腐蚀的能力增强。在相同冷热循环次数下,疲劳裂纹长度最短,裂纹生长速率最慢。展开更多
基金The financial support from the Natural Science Foundation of Shandong Province (ZR2020KB003)
文摘NF_(3)is commonly used as an etching and cleaning gas in semiconductor industry,however it is a strongly greenhouse gas.Therefore,the destruction of disposal NF_(3)is an urgent task to migrate the greenhouse effect.Among the technologies for NF_(3)abatement,the destructive sorption of NF_(3)over metal oxides sorbents is an effective way.Thus,the search for a highly reactive and utilized sorbent for NF_(3)destruction is in great demand.In this work,AlOOH supported on carbon-sphere(AlOOH/CS)as precursors were synthesized hydrothermally and heat-treated to prepare the Al_(2)O_(3)sorbents.The influence of AlOOH/CS hydrothermal temperatures on the reactivity of derived Al_(2)O_(3)sorbents for NF_(3)destruction was investigated,and it is shown that the Al2O3 from AlOOH/CS hydro-thermalized at 120℃is superior to others.Subsequently,the optimized Al_(2)O_(3)was covered by Mn(OH)x to prepare Mn/Al_(2)O_(3)sorbents via changing hydrothermal temperatures and Mn loadings.The results show that the Mn/Al_(2)O_(3)sorbents are more utilized than bare Al_(2)O_(3)in NF_(3)destructive sorption due to the promotional effect of Mn_(2)O_(3)as surface layer on the fluorination of Al_(2)O_(3)as substrate,especially the optimal 5%Mn/Al2O3(160℃)exhibits a utilization percentage as high as 90.4%,and remarkably exceeds all the sorbents reported so far.These findings are beneficial to develop more efficient sorbents for the destruction of NF_(3).
文摘为解决焦化废水尾水中有机物难降解问题,采用浸渍-煅烧法制备了负载活性金属氧化物的活性氧化铝型催化剂,通过臭氧催化氧化实验探索了载体和活性组分种类对COD去除率的影响,并对去除效率最高效的催化剂进行了表征分析。结果表明:BET分析发现Mn-Ni/γ-Al_(2)O_(3)(n_(Mn)∶n_(Ni)=2∶1)保留了γ-Al_(2)O_(3)的介孔结构,具有较大的表面积和孔体积,但负载后催化剂的比表面积和孔体积都有所降低,孔径变大;XPS和XRD分析发现锰主要以α-MnO_(2)形式存在,镍主要以复合价态存在,且二者存在强烈的相互作用;煅烧温度为450℃,煅烧时间为4 h,活性氧化铝载体催化活性最高;单组分催化剂相比于多组分催化剂,催化活性较低,其中Mn-Ni/γ-Al_(2)O_(3)的催化活性最好,60 min COD的去除率能达到43.26%,且重复使用6次后,COD的去除率仍达35.65%,催化活性仅降低17.60%,且Mn和Ni溶出量较低,表明催化剂具有良好的稳定性和重复使用性。
文摘研究T6处理、深冷处理和T6+深冷处理对ZCuAl 10 Fe 3Mn 2合金微观组织、力学性能以及在室温至450℃下的热疲劳行为。通过XRD,OM,SEM,EDS对合金组织和裂纹形貌进行观察分析。结果表明:T6+深冷复合处理工艺能够显著改善ZCuAl 10 Fe 3Mn 2合金的力学性能和微观组织。与T6处理相比,其抗拉强度、硬度以及伸长率分别提高了7.28%,16.96%和23.53%;其α相进一步细化且分布更加均匀,位错密度增加,使得合金整体的组织均匀性、致密性更好。综合性能的提高也有效地提高了合金的热疲劳性能,其抗热应力和氧化腐蚀的能力增强。在相同冷热循环次数下,疲劳裂纹长度最短,裂纹生长速率最慢。
基金Ting-ting FENG acknowledges the financial support from Professor Paul V.BRAUN at Department of Materials Science and Engineering,University of Illinois at Urbana-Champaign,the support from Chinese Scholarship Council during her visit to University of Illinois at Urbana-Champaign,partial financial supports from Department of Science and Technology of Sichuan Province,China(2019YFH0002,2019YFG0222 and 2019YFG0526).The research was partly carried out in the Frederick Seitz Materials Research Laboratory Central Research Facilities,University of Illinois at Urbana-Champaign.
