天然气技术与经济
天然氣技術與經濟
천연기기술여경제
Natural Gas Technology
2015年
1期
44-47,55
,共5页
梁旭%刘艳侠%赵永祥%蒋元力%魏灵朝
樑旭%劉豔俠%趙永祥%蔣元力%魏靈朝
량욱%류염협%조영상%장원력%위령조
氧化铝%硅掺杂%载镍催化材料%二氧化硅%拟薄水铝石粉%制备%表征
氧化鋁%硅摻雜%載鎳催化材料%二氧化硅%擬薄水鋁石粉%製備%錶徵
양화려%규참잡%재얼최화재료%이양화규%의박수려석분%제비%표정
alumina%silicon doping%nickel-based catalyst%silica%pseudo-boehmite%preparation%characterization
以拟薄水铝石为前驱物,分别运用混捏法和浸渍法制备硅掺杂氧化铝载体,并以此氧化铝为载体采用等体积浸渍法制备了负载型镍基催化剂,采用BET、NH3-TPD、XRD、UV-vis及H2-TPR对样品进行了表征。结果表明,两种掺杂方式对氧化铝载体孔结构影响不大,但对氧化铝表面性质影响较大。混捏法引入硅后,硅进入氧化铝晶格空位,造成氧化铝晶体结构发生变化,使活性组分镍在其表面的分布以晶格空位为主,载体与活性组分间相互作用较强;而浸渍法引入硅的氧化铝表面晶格空位被二氧化硅优先占据,因而负载活性组分后,活性组分镍无法进入氧化铝晶格,只能以游离态分布于表面,与载体之间相互作用较弱,可还原度提高。
以擬薄水鋁石為前驅物,分彆運用混捏法和浸漬法製備硅摻雜氧化鋁載體,併以此氧化鋁為載體採用等體積浸漬法製備瞭負載型鎳基催化劑,採用BET、NH3-TPD、XRD、UV-vis及H2-TPR對樣品進行瞭錶徵。結果錶明,兩種摻雜方式對氧化鋁載體孔結構影響不大,但對氧化鋁錶麵性質影響較大。混捏法引入硅後,硅進入氧化鋁晶格空位,造成氧化鋁晶體結構髮生變化,使活性組分鎳在其錶麵的分佈以晶格空位為主,載體與活性組分間相互作用較彊;而浸漬法引入硅的氧化鋁錶麵晶格空位被二氧化硅優先佔據,因而負載活性組分後,活性組分鎳無法進入氧化鋁晶格,隻能以遊離態分佈于錶麵,與載體之間相互作用較弱,可還原度提高。
이의박수려석위전구물,분별운용혼날법화침지법제비규참잡양화려재체,병이차양화려위재체채용등체적침지법제비료부재형얼기최화제,채용BET、NH3-TPD、XRD、UV-vis급H2-TPR대양품진행료표정。결과표명,량충참잡방식대양화려재체공결구영향불대,단대양화려표면성질영향교대。혼날법인입규후,규진입양화려정격공위,조성양화려정체결구발생변화,사활성조분얼재기표면적분포이정격공위위주,재체여활성조분간상호작용교강;이침지법인입규적양화려표면정격공위피이양화규우선점거,인이부재활성조분후,활성조분얼무법진입양화려정격,지능이유리태분포우표면,여재체지간상호작용교약,가환원도제고。
Using pseudo-boehmite as raw material, silicon-doped alumina was prepared by kneading and impregnation methods, respectively, and Ni catalysts supported on the silicon doped alumina were prepared by the incipient wetness impregnation method. The support and catalyst samples were characterized by N2 adsorption-desorption, NH3-TPD, XRD, UV-vis and H2-TPR. Results showed that doping mode had little effect on pore structure of alumina but had great influence on its surface properties. When alumina was doped with silicon by kneading method, silicon entered into the lattice vacancies of alumina, which caused the change of crystal structure of alumina, and the active components of nickel were mainly distributed in the lattice vacancies, which made interaction between support and active component stronger; and when alumina was doped with silicon by impregnation method, the lattice vacancies of alumina surface were occupied by silica in priority and couldn ’t accommodate nickel when loading active component on the support later, which made nickel be on the surface of support in the dissociation form having weak interaction with the support and be easier to be reduced.