A spinel-type oxides ZnFe2O4 photocatalysts were prepared by citric acid complex method,and characterized with XRD,TG-DTA,FT-IR,TEM techniques.The photocatalytic activities were investigated by the degradation of C3H2...A spinel-type oxides ZnFe2O4 photocatalysts were prepared by citric acid complex method,and characterized with XRD,TG-DTA,FT-IR,TEM techniques.The photocatalytic activities were investigated by the degradation of C3H22N6O6S2Na2 by artificial visible Light.The results show that the photocatalytic activity of ZnFe2O4 is stable,under experimental conditions,the degradation rate of C3H22N6O6S2 is over 90% in 60min.展开更多
以镍铁水滑石为单一前驱体,通过高温焙烧制备了NiFe_2O_4/NiO纳米复合材料,对该纳米复合材料在碱性介质中电催化水的氧化性能进行了研究.结果表明,相比于化学共沉淀法制备的单独NiFe_2O_4、NiO及其物理混合物NiFe_2O_4+NiO,NiFe_2O_4/Ni...以镍铁水滑石为单一前驱体,通过高温焙烧制备了NiFe_2O_4/NiO纳米复合材料,对该纳米复合材料在碱性介质中电催化水的氧化性能进行了研究.结果表明,相比于化学共沉淀法制备的单独NiFe_2O_4、NiO及其物理混合物NiFe_2O_4+NiO,NiFe_2O_4/NiO纳米复合材料具有更高的电催化水氧化活性和更好的循环稳定性.电流密度为10 m A/cm2时过电位仅为364 m V.展开更多
采用表面反应改性法制备了ZrO2 SiO2(ZrSiO)表面复合物,用等体积浸渍法制备了ZrSiO负载的Ni Cu双金属催化剂,并用IR、TPD、TPSR和微反技术考察了CH4、H2O和O2在催化剂表面上的化学吸附及反应性能。结果表明,在Ni Cu ZrSiO催化剂上存在着...采用表面反应改性法制备了ZrO2 SiO2(ZrSiO)表面复合物,用等体积浸渍法制备了ZrSiO负载的Ni Cu双金属催化剂,并用IR、TPD、TPSR和微反技术考察了CH4、H2O和O2在催化剂表面上的化学吸附及反应性能。结果表明,在Ni Cu ZrSiO催化剂上存在着Ni Cu金属位,Lewis酸位Znn+和碱位Zr O-三类活性中心;CH4和H2O在金属位和Lewis酸位Znn+和碱位Zr O-的协同作用下可形成解离吸附态;CH4、H2O和O2在Ni Cu ZrSiO催化剂表面上的主要反应产物为H2和CO2,选择性均在95%以上。展开更多
文摘A spinel-type oxides ZnFe2O4 photocatalysts were prepared by citric acid complex method,and characterized with XRD,TG-DTA,FT-IR,TEM techniques.The photocatalytic activities were investigated by the degradation of C3H22N6O6S2Na2 by artificial visible Light.The results show that the photocatalytic activity of ZnFe2O4 is stable,under experimental conditions,the degradation rate of C3H22N6O6S2 is over 90% in 60min.
文摘以镍铁水滑石为单一前驱体,通过高温焙烧制备了NiFe_2O_4/NiO纳米复合材料,对该纳米复合材料在碱性介质中电催化水的氧化性能进行了研究.结果表明,相比于化学共沉淀法制备的单独NiFe_2O_4、NiO及其物理混合物NiFe_2O_4+NiO,NiFe_2O_4/NiO纳米复合材料具有更高的电催化水氧化活性和更好的循环稳定性.电流密度为10 m A/cm2时过电位仅为364 m V.
文摘采用表面反应改性法制备了ZrO2 SiO2(ZrSiO)表面复合物,用等体积浸渍法制备了ZrSiO负载的Ni Cu双金属催化剂,并用IR、TPD、TPSR和微反技术考察了CH4、H2O和O2在催化剂表面上的化学吸附及反应性能。结果表明,在Ni Cu ZrSiO催化剂上存在着Ni Cu金属位,Lewis酸位Znn+和碱位Zr O-三类活性中心;CH4和H2O在金属位和Lewis酸位Znn+和碱位Zr O-的协同作用下可形成解离吸附态;CH4、H2O和O2在Ni Cu ZrSiO催化剂表面上的主要反应产物为H2和CO2,选择性均在95%以上。
基金financially supported by the Department of Science and Technology of Shandong Province(No.2012GSF11708)Graduate Innovation Foundation of Yantai University(GIFYTU)
文摘为了防止铁酸钴(Co Fe_(2)O_(4))纳米颗粒团聚,提高其对奥克托今(HMX)和哈托(TKX-50)的催化分解性能,采用类石墨氮化碳(g-C_(3)N_(4))作为Co Fe_(2)O_(4)纳米颗粒的分散剂载体,通过溶剂热法原位生长制备了Co Fe_(2)O_(4)/g-C_(3)N_(4)二元纳米复合材料,并利用X射线粉末衍射仪、扫描电子显微镜、傅立叶变换红外光谱仪以及差示扫描量热仪等研究了其组成、结构形貌及催化分解性能。结果表明,Co Fe_(2)O_(4)/g-C_(3)N_(4)复合材料形貌均匀密实,使HMX和TKX-50的热分解峰温分别降低了7.0℃和41.3℃,表观活化能分别降低了341.1 k J·mol^(-1)和21.0 k J·mol^(-1),同时增大了其放热量。残渣分析结果发现HMX几乎完全被催化分解,而TKX-50催化分解不彻底,其残渣和Co Fe_(2)O_(4)/g-C_(3)N_(4)形成了微米级块状混合物。
