摘要
采用成型TiO2为载体,以甲烷为碳源,镍铜双金属催化剂,改变反应温度以及碳氢比(CH4/H2摩尔比),生长纳米碳纤维(CNF),制备出结构化复合纳米碳纤维催化材料——生长在成型TiO2上的纳米碳纤维材料(CNF/TiO2)。扫描电镜(SEM)和物理吸附仪(BET)表征结果表明,CNF粗细均匀、直径～70nm,而且与其他传统催化剂载体(活性炭)相比几乎没有微孔。并以CNF/TiO2为载体,采用浸渍法负载金属钯,制备出结构化纳米碳纤维负载型钯催化剂(Pd/CNF/TiO2),以苯乙烯加氢为模型反应进行活性评价,结果表明,其催化活性明显优于成型活性炭负载型Pd催化剂。结构化纳米碳纤维具有比表面适中,且不含微孔,是一种优良的催化剂载体,可望用于受内扩散制约的气液固三相催化反应。
In order to prepare the formed TiO2 supported carbon nanofibers （CNF/TiO2 ）, which was prepared to be used as the support of the palladium catalyst, the nickel-copper bimetallic catalyst supported on formed TiO： was used to catalyze decomposition of methane to grow carbon nanofibers （CNF） on the formed TiO2. The structured CNF grown on the formed TiO2 were prepared by using different catalytic decomposition temperatures and with different molar ratios of CH4/H2 during their preparation, and the prepared structured CNF were characterized by scanning electron microscopy （SEM） and Brunner-Emmit-Teller method （BET）. The results show that the uniform CNF with diameter of around 70 nm grow on the surface of the formed TiO2, and the specific area of the CNF is relatively high; comparing with traditional solid carriers, such as activated carbon, the CNF are almost absent of mieropores on its external surface. The structured CNF supported palladium catalysts （Pd/CNF/TiO2） were prepared by impregnation method, and their activities were evaluated by reaction of hydrogenation of styrene, The evaluation shows that the hydrogenation activity of the Pd/CNF/ TiO2 is significantly higher than that of commercial formed activated carbon supported Pd catalyst. The structured carbon nanofiber which has suitable surface area and hasn＇t micropores js an excellent catalyst support and can be used for the three-phase catalytic reactions controlled by internal diffusion.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2009年第3期527-531,共5页
Journal of Chemical Engineering of Chinese Universities
基金
江苏省高校自然科学基础研究项目资助(07KJB530024)
江苏省基础研究计划(自然科学基金)资助项目(BK2007044)
江苏省高校自然科学重大基础研究项目资助(05KJA43004)
教育部留学回国人员科研启动基金
