National Taiwan University Coll ManagementLi, TaoTaoLiWong, She-TinShe-TinWongChao, Man-ChienMan-ChienChaoLin, Hong-PingHong-PingLinMou, Chung-YuanChung-YuanMouCheng, SoofinSoofinCheng2006-11-152018-07-102006-11-152018-07-102004http://ntur.lib.ntu.edu.tw//handle/246246/2006111501232938W/Zr mixed oxides supported on various porous silica materials, namely SBA-15, MCM-41 & silica gel, were prepared. Their acidities & catalytic activities in n-pentane isomerization were examined. For the mesoporous silica, SBA-15 was found to retain the ordered meso-structure better than MCM-41 after loading with W/Zr mixed oxide. TEM photographs showed that tungstated zirconia was dispersed inside the mesoporous channels of SBA-15, & that the surface area & pore volume decreased with the loading. The SBA-15 supported WO3/ZrO2 materials promoted with Pt were highly catalytic efficient in n-pentane isomerization with a very high iso-pentane selectivity. In contrast, MCM-41 & silica gel supported WO3/ZrO2 showed lower catalytic activities. The optimal activity was observed on SBA-15 with 1%Pt/20%WO3/40%ZrO2. The mesoporous silica supports played an important role in stabilizing the mixed oxide catalyst since the catalytic activity decayed less markedly with time-on-stream on the supported catalysts.application/pdf280416 bytesapplication/pdfzh-TWTungstated zirconiaMixed oxideCatalystAcidMesoporous silicaMCM-41SBA-15Isomerization of n-pentanePlatinumjournal articlehttp://ntur.lib.ntu.edu.tw/bitstream/246246/2006111501232938/1/5283.pdf