摘要
利用微波能制备活性炭负载铜、锰催化剂并进行热重、元素组成、晶体结构及表面形貌等表征测试.结果表明,过渡金属的负载可一定程度提高活性炭的失重温度,热重分析为催化剂的催化温度上限提供了依据.活性炭中存在硅、铝、铁等杂质元素,同时有一定量的氧元素存在.微波法制备的两种炭载金属催化剂中分别形成了单质铜晶体和单质锰与其氧化物的共存晶体,粒径尺寸分别为22.4 nm和30.92 nm,大量晶粒的聚积形成了催化剂表面微米级的金属颗粒,计算分析证明微波可穿透金属颗粒.实验研究表明300 W微波功率下活性炭载铜催化剂的制备效果较好,而400 W适合于活性炭载锰催化剂的制备.
Granular activated carbon-supported copper or manganese catalysts were prepared using microwave energy, and characterized by thermogravimetry（TG）, energy-dispersive X-ray spectroscopy（EDX）, X-ray diffraction（XRD） and scan- ning electron microscopy（SEM）. The results showed that the transition metal loaded could increase the thermo gravimetric temperature of activated carbon to some degree, and TG analysis provided the highest temperature of the catalyst application. Impurity elements, such as silicon, aluminum and iron etc,as well as oxygen element were found in granular activated carbon（GAC）, Crystal of metallic copper and coexistent crystals of metallic manganese and its oxides were formed on the surface of GAC, and their sizes were 22.4 nm and 30.92 nm respectively. Big metallic particles with the size of micron range that observed by SEM, were speculated to be formed by the accumulation of crystal grains. It was calculated that microwave could penetrate the metallic particle on the surface of the catalyst. It showed that 300 W of microwave power was better for the preparation of carbon-supported copper catalyst, and 400 W adapted to carbon-supported manganese catalyst.
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2008年第4期532-537,共6页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
陕西省教育厅专项科研计划项目(07KJ279)
西安建筑科技大学青年科技基金项目(QN0609)
关键词
炭载金属催化剂
微波
制备
表征
carbon-supported metal catalyst
microwave
preparation
characteristics
