The XRD patterns of different calcined layered double hydroxides(CLDH) and their ultraviolet absorbing and screening properties have been investigated. It has been found that a calcined layered double hydroxide(CLDH) ...The XRD patterns of different calcined layered double hydroxides(CLDH) and their ultraviolet absorbing and screening properties have been investigated. It has been found that a calcined layered double hydroxide(CLDH) containing zinc is very effective in absorbing and screening ultraviolet radiation. The crystal structure of a CLDH containing zinc is similar to that of ZnO and is not related to the crystal structure of Al 2O 3. It is not a simple combination of zinc oxide and aluminium oxide but a calcined layered double hydroxide in which part of the Zn 2+ cations is replaced by Al 3+ cations.展开更多
以柠檬酸为络合剂,采用溶胶-凝胶法制备了非负载Ni-Mo复合氧化物催化剂,用N2吸附-脱附、XRD、SEM等手段对催化剂进行了表征。在连续流动固定床反应器上,以乙酸为探针分子考察了不同溶液pH值和溶剂量制备催化剂对催化加氢脱氧性能的影响...以柠檬酸为络合剂,采用溶胶-凝胶法制备了非负载Ni-Mo复合氧化物催化剂,用N2吸附-脱附、XRD、SEM等手段对催化剂进行了表征。在连续流动固定床反应器上,以乙酸为探针分子考察了不同溶液pH值和溶剂量制备催化剂对催化加氢脱氧性能的影响。结果表明:溶胶-凝胶法制备的催化剂具有较高的比表面积和双介孔结构;主要以复合氧化物NiMoO4的形式存在;改变溶液的pH值和溶剂量,对催化剂的比表面积有一定影响。在初始溶液pH=1、溶剂量855 mL(mol(Ni+Mo))1的条件下制备的催化剂具有较优异的加氢脱氧活性,在0.3 MPa,250℃,液时空速2 h 1的条件下,催化剂催化乙酸加氢脱氧的转化率和脱氧率分别达到99.9%和98.9%。展开更多
Mg/Al layered double hydroxide(LDH) was treated with stearic acid by a wet method. The modified double hydroxide showed good dispersion and floatation property with their layer structure being remained almost unchanged.
文摘The XRD patterns of different calcined layered double hydroxides(CLDH) and their ultraviolet absorbing and screening properties have been investigated. It has been found that a calcined layered double hydroxide(CLDH) containing zinc is very effective in absorbing and screening ultraviolet radiation. The crystal structure of a CLDH containing zinc is similar to that of ZnO and is not related to the crystal structure of Al 2O 3. It is not a simple combination of zinc oxide and aluminium oxide but a calcined layered double hydroxide in which part of the Zn 2+ cations is replaced by Al 3+ cations.
文摘以柠檬酸为络合剂,采用溶胶-凝胶法制备了非负载Ni-Mo复合氧化物催化剂,用N2吸附-脱附、XRD、SEM等手段对催化剂进行了表征。在连续流动固定床反应器上,以乙酸为探针分子考察了不同溶液pH值和溶剂量制备催化剂对催化加氢脱氧性能的影响。结果表明:溶胶-凝胶法制备的催化剂具有较高的比表面积和双介孔结构;主要以复合氧化物NiMoO4的形式存在;改变溶液的pH值和溶剂量,对催化剂的比表面积有一定影响。在初始溶液pH=1、溶剂量855 mL(mol(Ni+Mo))1的条件下制备的催化剂具有较优异的加氢脱氧活性,在0.3 MPa,250℃,液时空速2 h 1的条件下,催化剂催化乙酸加氢脱氧的转化率和脱氧率分别达到99.9%和98.9%。
文摘Mg/Al layered double hydroxide(LDH) was treated with stearic acid by a wet method. The modified double hydroxide showed good dispersion and floatation property with their layer structure being remained almost unchanged.
