CAJ | 학술논문

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。
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.