催化CVD调变PAN-ACF微结构研究  

Studies on Microstructures of PAN-ACF Modified by Catalytic CVD

作　　者：陆安慧[1] 郑经堂[1] 王茂章[1] 

机构地区：[1]中国科学院山西煤炭化学研究所,太原030001

出　　处：《高等学校化学学报》2001年第9期1546-1550,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金 (批准号 :5 96 72 0 2 5 )资助

摘　　要：首次采用催化气相沉积法 ( CVD) ,以异丙醇为溶剂将催化剂 [Ni( NO3) 2 · 6H2 O]有效地分散在 PAN-ACF较大的微孔上 ,使其成为积炭的活性位 ,从而将 ACF的孔径调控在分子筛孔径效应范围内 .以液氮为吸附质 ,测定了样品吸附等温线 ,采用 H-K及 DFT法计算孔结构 ,用 XRD及 SEM表征 ACF的显微织构 。PAN ACF(polyacrylonitrile activated carbon fiber) was firstly impregnated with Ni(NO 3) 2·6H 2O by using 2 propanol as the solvent. By this method, nickel ion can be dispersed effectively in/on the micropore′s entrance or external surface, which were made as an active site for coking to modify the micropore size in a narrower range. The porous structures of PAN ACF were studied by means of nitrogen adsorption. The micropore size and micropore volume were calculated by Horvath Kawazoe(H K) equations. The results showed that the ultramicropore concentrated on about 0 48 nm and the micropore volumes were 0 19-0 25 mL/g. The whole pore size distribution was obtained by using density functional theory(DFT). It was shown that the micropore was mainly concentrated on 0.6-0.8 nm. After being washed by acid and deionized water, the sample′s BET surface area and micropore volume were improved and the average pore size kept unchanged, this may be due to the catalyst loaded in the ultramicropore resolved by acid leaving more adsorption space. An X ray diffractometer(XD 3XA) was used to observed the spectra of samples. It was shown that nickel ion might be effectively dispersed in ACF, the existence of NiO particles were ascribed to the oxidation by air, and which were dissolved through acid treatment. A JEM EX1200 electron microscopy was used to examine the morphologies of PAN ACFs. The SEM results showed that the sample impregnated with nickel ion could be well distributed by deposited carbon than that without nickel ion. All the results demonstrated that the microstructures of PAN ACF could be modified by CVD using nickel ion as the catalyst for coking.

关 键 词：PAN-ACF 微结构 硝酸镍 催化气相沉积 活性炭纤维 吸附剂 孔径控制 

分 类 号：O647.3[理学—物理化学]