CAJ | 학술논문

选用具有不同结构的分子筛Y,Beta、ZSM-5、MOR和MCM-22为载体,采用离子交换法制备了一系列负载Co分子筛催化剂,并采用XRD、UV-vis和元素分析对它们进行了表征.以O_2为氧化剂,考察了所制催化剂在液相环己烷氧化反应中的催化性能.结果表明,分子筛载体的性质对制备的负载Co催化剂在液相环己烷氧化反应中的催化性能有很大影响.在相同反应条件下,所制备的5种负载Co分子筛催化剂中,Co/Y催化环己烷氧化反应的环己醇和环己酮混合物(KA油)的选择性最高.在130℃、1.2 Mpa O_2分压下反应3 h,Co/Y催化环己烷氧化反应的转化率为15.9%,KA油的选择性为79.0%.Co/Y催化剂在所考察的反应条件下具有良好的稳定性,经重复使用5次,仍保持良好的催化性能.
선용구유불동결구적분자사Y,Beta、ZSM-5、MOR화MCM-22위재체,채용리자교환법제비료일계렬부재Co분자사최화제,병채용XRD、UV-vis화원소분석대타문진행료표정.이O_2위양화제,고찰료소제최화제재액상배기완양화반응중적최화성능.결과표명,분자사재체적성질대제비적부재Co최화제재액상배기완양화반응중적최화성능유흔대영향.재상동반응조건하,소제비적5충부재Co분자사최화제중,Co/Y최화배기완양화반응적배기순화배기동혼합물(KA유)적선택성최고.재130℃、1.2 Mpa O_2분압하반응3 h,Co/Y최화배기완양화반응적전화솔위15.9%,KA유적선택성위79.0%.Co/Y최화제재소고찰적반응조건하구유량호적은정성,경중복사용5차,잉보지량호적최화성능.
Y, Beta, ZSM-5, MOR, and MCM-22 zeolites, with different structures and surface characteristics, were employed as supports. A series of zeolite supported Co catalysts were prepared by ion-exchange and characterized by XRD, UV-vis and elemental analysis. The catalytic performance of the prepared catalysts in liquid-phase oxidation of cyclohexane by molecular oxygen was investigated. The results showed that the properties of zeolite supports had great influence on catalytic performance of the prepared Co supported catalysts for liquid-phase oxidation of cyclohexane. Among the prepared five zeolite supported Co catalysts, Co/Y exhibited the highest selectivity for the mixture of eyclohexanol and cyclohexanone (KA oil) in cyclohexane oxidation under identical reaction conditions. About 15.9% conversion of cyclohexane and 79.0% selectivity of KA oil could be obtained in eyclohexane oxidation catalyzed by Co/Y catalyst at 130℃ under O_2pressure of 1.2 MPa after reaction of 6 h. Under the investigated reaction conditions, Co/Y was recyclable in cyclohexane oxidation and the conversion and selectivity changed slightly after five runs.