CAJ | 학술논문

用乙二醇法和浸渍法制备两种负载在堇青石上的钴基负载催化剂,并用XRD、XPS、TPR和TPD对制备的催化剂进行表征,比较两种催化剂催化氧化（燃烧）甲苯的活性。研究结果表明,与浸渍法制备的Co/cord催化剂相比,乙二醇法制备的催化剂Co/cord-EG对甲苯催化燃烧活性明显提高。应用乙二醇法制备Co/cord-EG负载型催化剂,Co元素主要以Co2＋存在于载体表面;而传统浸渍法制备的Co/cord催化剂,Co元素是以Co2＋与Co3＋的两种化学状态存在于载体表面。应用乙二醇法制备Co/cord-EG负载型催化剂,有助于在载体表面形成比较均匀的吸附活性位。应用乙二醇法制备的Co/cord-EG催化剂,催化活性组分能在载体表面上以更小颗粒而且更高的分散度存在,从而能明显提高其催化活性。
용을이순법화침지법제비량충부재재근청석상적고기부재최화제,병용XRD、XPS、TPR화TPD대제비적최화제진행표정,비교량충최화제최화양화（연소）갑분적활성。연구결과표명,여침지법제비적Co/cord최화제상비,을이순법제비적최화제Co/cord-EG대갑분최화연소활성명현제고。응용을이순법제비Co/cord-EG부재형최화제,Co원소주요이Co2＋존재우재체표면;이전통침지법제비적Co/cord최화제,Co원소시이Co2＋여Co3＋적량충화학상태존재우재체표면。응용을이순법제비Co/cord-EG부재형최화제,유조우재재체표면형성비교균균적흡부활성위。응용을이순법제비적Co/cord-EG최화제,최화활성조분능재재체표면상이경소과립이차경고적분산도존재,종이능명현제고기최화활성。
In the present work we studied the toluene decomposition activity of cobalt based catalysts prepared by chemical reduction with ethylene glycol（EG）,in comparison to catalysts prepared via typical impregnation procedure.The properties of the supported Co catalysts were studied by means of X-ray diffraction（XRD）,temperature programmed reduction by H2（H2-TPR）,X-ray photoelectron spectroscopy（XPS）,temperature program desorption（TPD）.Activity tests of the catalysts were carried out in a fixed bed reactor.Results showed that the catalytic activity of the catalyst Co/cord-EG prepared by chemical reduction with ethylene glycol was much higher than that of the catalyst Co/cord prepared by the conventional impregnation.The cobalt species presented on the catalyst Co/cord-EG were mainly in the form of cobalt（Ⅱ） oxide,and those presented on the catalyst Co/cord were in the forms of both cobalt（Ⅱ） oxide and cobalt（Ⅲ） oxide.The application of the EG reduction method favored the formation of smaller particles and higher dispersion of cobalt species on the supports.As a consequence of that,the catalytic activity of the catalyst Co/cord-EG was greatly improved in comparison with the catalyst Co/cord pretreated by the traditional impregnation.