Study Of PtSn/Al₂O₃ Catalyst For Isobutane Dehydrogenation

As an important chemical raw material,the demand of isobutene is guadually increasing worldwidely in recent years.Therefore,the researchers begin to seek for new process for producting isobutene besides traditional process.The isobutane dehydrogenation to isobutene is attracting more and more attention because of its simple separation process and low production costs,and this production process is widely used for isobutene industrial production.The Pt-based catalyst is a kind of important catalysts in the industrial process.At present,the inhibition of catalyst deactivation is the hot topic.Herein,we have studied the Pt-based catalyst starting with the composition of the catalyst.We have investigated the effect of the composition on the catalytic property in three parts,including the content of Pt,the addition of Sn,and the structure of supported Al2O3.After testing,we have got the optimal catalyst composition which performed the best catalytic performance,which is the catalyst containing 0.5% Pt,1%Sn and supported by nanosheet Al2O3.These catalysts were characterized by XRD、TEM、HAADF-STEM 和 CO-DRIFT,and the results showed that PtSn species was stable on the nanosheet-like Al2O3 in the form of nanoclusters.Furthermore,based on the above results,we have also studied the process conditions of isobutane hydrogenation.We have investigated the effect of the process conditions on the catalytic property in three parts,including reaction temperature,V(iC4H10)/V(H2)and WHSV.The results showed that 0.5%Pt1%Sn/ Al2O3-sheet catalyst got the best catalytic performance and good stability under the process conditions of 560 °C,V(iC4H10)/V(H2)=1:1.25 and WHSVisobutane=12.5 h-1.TG analysis showed that 0.5%Pt1%Sn /Al2O3-sheet catalyst had good anti-coking ability.