The Ni(OH)2/SiO2 binary colloid was prepared using Ni(NO3)2.6H2O and (C2H5O)4SiO4 as starting materials and was used to form NiO/SiO2. composite powder by hydrothermal method and desiccant method in open air respectiv...The Ni(OH)2/SiO2 binary colloid was prepared using Ni(NO3)2.6H2O and (C2H5O)4SiO4 as starting materials and was used to form NiO/SiO2. composite powder by hydrothermal method and desiccant method in open air respectively. Multi-walled carbon nanotubes (MWCNTs) were synthesized respectively by chemical vapor deposition using the NiO/SiO2 catalyst prepared by different methods. The phase and morphology of the catalysts and the morphology, output yield and purity of MWCNTs were compared by XRD, TEM and SEM. The results show that the catalyst powder prepared by hydrothermal method, compared with that by desiccant method, is smaller, better dispersion and has stronger catalytic activity. Pure MWCNTs with smaller tube diameter and narrow range could be obtained at a high yield using that NiO/SiO2 powder prepared by hydrothermal method as catalyst.展开更多
采用双外推法对稻壳催化热解进行了动力学分析。结果表明,50%CuO+50%Fe_2O_3和50%CuO 50%Fe_2O_3加入促进了稻壳热解,三种条件下活化能分别为87.96,63.6和50.74 k J/mol,催化剂的加入使活化能分别降低了27.68%和42.31%。催化剂的加入没...采用双外推法对稻壳催化热解进行了动力学分析。结果表明,50%CuO+50%Fe_2O_3和50%CuO 50%Fe_2O_3加入促进了稻壳热解,三种条件下活化能分别为87.96,63.6和50.74 k J/mol,催化剂的加入使活化能分别降低了27.68%和42.31%。催化剂的加入没有改变反应机理函数,始终保持为二级化学反应模型[(1-α)^(-1)-1]。展开更多
基金This work was supported in part by NSF of Guangdong Province,the Most Important Items of the Tenth Five-Year Plan of Guangdong Provincethe Project of Science and Technology Program of Guangdong Province+1 种基金the Project of Science and Technology Program of Guangzhou Citythe Maoming Science Technology Fund of Guangdong Province.
文摘The Ni(OH)2/SiO2 binary colloid was prepared using Ni(NO3)2.6H2O and (C2H5O)4SiO4 as starting materials and was used to form NiO/SiO2. composite powder by hydrothermal method and desiccant method in open air respectively. Multi-walled carbon nanotubes (MWCNTs) were synthesized respectively by chemical vapor deposition using the NiO/SiO2 catalyst prepared by different methods. The phase and morphology of the catalysts and the morphology, output yield and purity of MWCNTs were compared by XRD, TEM and SEM. The results show that the catalyst powder prepared by hydrothermal method, compared with that by desiccant method, is smaller, better dispersion and has stronger catalytic activity. Pure MWCNTs with smaller tube diameter and narrow range could be obtained at a high yield using that NiO/SiO2 powder prepared by hydrothermal method as catalyst.
文摘采用双外推法对稻壳催化热解进行了动力学分析。结果表明,50%CuO+50%Fe_2O_3和50%CuO 50%Fe_2O_3加入促进了稻壳热解,三种条件下活化能分别为87.96,63.6和50.74 k J/mol,催化剂的加入使活化能分别降低了27.68%和42.31%。催化剂的加入没有改变反应机理函数,始终保持为二级化学反应模型[(1-α)^(-1)-1]。
