摘要
The ZnO catalysts supported on Silicalite-1 zeolites with different crystallite sizes(0.08,0.35,1 and 1.7 jjm,respectively)and 5%Zn were synthesized via an incipient wetness method.The catalysts were characterized by XRD,N2 adsorption,SEM,TEM-EDX,DRIFT spectra and NH3-TPD,and their catalytic performance in isobutane dehydrogenation assisted by C02 was investigated.The catalytic activity is strongly dependent on the crystallite size of Silicalite-1 support.The ZnO/S-l-O.35 catalyst with ca.0.35 μmcrystallite size displays the highest activity,affording an initial isobutane conversion of 51.0%and 74.5%isobutene selectivity.This can be attributed to a higher amount of acid sites present on this catalyst as well as the largest amount of nest silanols possessed by the S-l-0.35 support.
基金
the National Key R&D Program of China(2017YFB0602200)
the National Natural Science Foundation of China(91645201)
the Science and Technology Com mission of Shanghai Municipality(19DZ2270100)
the Shanghai Research Institute of Petrochemical Technology SINOPEC(19ZC06070005).
