以CeO_2为载体,制备了负载型复合Ni Fe/CeO_2催化剂,用于乙二醇的水相重整制氢.利用N_2吸附脱附(N_2 adsorption-desorption)、X-射线衍射(XRD)和H2化学吸附(H_2 temperature program reduction)对催化剂的结构进行了表征,并考察了Ni/F...以CeO_2为载体,制备了负载型复合Ni Fe/CeO_2催化剂,用于乙二醇的水相重整制氢.利用N_2吸附脱附(N_2 adsorption-desorption)、X-射线衍射(XRD)和H2化学吸附(H_2 temperature program reduction)对催化剂的结构进行了表征,并考察了Ni/Fe摩尔比对乙二醇水相重整制氢效果的影响以及催化剂的可重复使用性.实验结果表明:在Ni_1Fe_2/CeO_2催化剂上的乙二醇水相重整制氢反应中,H_2选择性为89.27%,,乙二醇转化率为99.13%,,烷烃选择性为11.43%,;催化剂重复使用5次以后,仍然保持初始活性的65%,左右.展开更多
Nanoscale bimetallic Ni/Fe particles were synthesized from the reaction of sodium borohydride （NaBH4） with reduction of Ni^2＋ and Fe^2＋ in aqueous solution. The obtained Ni/Fe particles were characterized by TEM ...Nanoscale bimetallic Ni/Fe particles were synthesized from the reaction of sodium borohydride （NaBH4） with reduction of Ni^2＋ and Fe^2＋ in aqueous solution. The obtained Ni/Fe particles were characterized by TEM （transmission electron microscope）, XRD （X-ray diffractometer）, and N2-BET. The dechlorination activity of the Ni/Fe was investigated using p-chlorophenol （p-CP） as a probe agent. Results demonstrated that the nanoscale Ni/Fe could effectively dechlorinate p-CP at relatively low metal to solution ratio of 0.4 g/L （Ni 5 wt%）. The target with initial concentration ofp-CP 0.625 mmol/L was dechlorinted completely in 60 rain under ambient temperature and pressure. Factors affecting dechlorination efficiency, including reaction temperature, pH, Ni loading percentage over Fe, and metal to solution ratio, were investigated. The possible mechanism of dechlorination ofp-CP was proposed and discussed. The pseudo-first- order reaction took place on the surface of the Ni/Fe bimetallic particles, and the activation energy of the dechlorination reaction was determined to be 21.2 kJ/mol at the temperature rang of 287-313 K.展开更多
文摘以CeO_2为载体,制备了负载型复合Ni Fe/CeO_2催化剂,用于乙二醇的水相重整制氢.利用N_2吸附脱附(N_2 adsorption-desorption)、X-射线衍射(XRD)和H2化学吸附(H_2 temperature program reduction)对催化剂的结构进行了表征,并考察了Ni/Fe摩尔比对乙二醇水相重整制氢效果的影响以及催化剂的可重复使用性.实验结果表明:在Ni_1Fe_2/CeO_2催化剂上的乙二醇水相重整制氢反应中,H_2选择性为89.27%,,乙二醇转化率为99.13%,,烷烃选择性为11.43%,;催化剂重复使用5次以后,仍然保持初始活性的65%,左右.
基金Project supported by the National Basic Research Program (973) of China(No. 2003CB415006)the National Natural Science Foundation of China (No. 20337020)
文摘Nanoscale bimetallic Ni/Fe particles were synthesized from the reaction of sodium borohydride （NaBH4） with reduction of Ni^2＋ and Fe^2＋ in aqueous solution. The obtained Ni/Fe particles were characterized by TEM （transmission electron microscope）, XRD （X-ray diffractometer）, and N2-BET. The dechlorination activity of the Ni/Fe was investigated using p-chlorophenol （p-CP） as a probe agent. Results demonstrated that the nanoscale Ni/Fe could effectively dechlorinate p-CP at relatively low metal to solution ratio of 0.4 g/L （Ni 5 wt%）. The target with initial concentration ofp-CP 0.625 mmol/L was dechlorinted completely in 60 rain under ambient temperature and pressure. Factors affecting dechlorination efficiency, including reaction temperature, pH, Ni loading percentage over Fe, and metal to solution ratio, were investigated. The possible mechanism of dechlorination ofp-CP was proposed and discussed. The pseudo-first- order reaction took place on the surface of the Ni/Fe bimetallic particles, and the activation energy of the dechlorination reaction was determined to be 21.2 kJ/mol at the temperature rang of 287-313 K.
