Direct impregnation method for preparing sulfated zirconia supported on mesoporous silica

Synthesis and characterization of thermally stable mesostructured sulfated zirconia by a novel sulfate-assisted alcohothermal route

“…The conversion profiles show strong activity decay during the first 30 min on stream, followed by a slower deactivating region. Similar initial high rates of conversion for n-butane isomerization has already been reported by Mou et al for various mesoporous molecular sieve supported SZ materials [8][9][10]. One can also see that for the present MSZ samples prepared by the alcohothermal method, n-butane conversion increased in the order of Zr/ SO 2À 4 ¼ 12 < 8 < 4.…”

“…Hence, the usefulness of these materials is greatly compromised due to their limited specific surface area. Higher surface areas are attainable by supporting SZ materials on mesoporous materials such as MCM-41, SBA-15 and FSM-16 [7][8][9][10][11][12], but this was usually achieved at the expense of low catalytic activity for alkane isomerization, which is possibly due to a decrease of their acidic strength [10].…”

Condensation of Indole with Isatin over AlCl₃/Mesoporous Aluminosilicate

“…The impregnated AlCl 3 covered the surface of mesoporous aluminosilicate leading to the reduction in surface area. A similar result was conducted by Chen et al [24] where impregnated S-ZrO 2 was uniformly dispersed on the MCM-41 surface lowering the surface area. 1% AlCl 3 /AM catalyst had similar surface area with pure AM since the impregnated AlCl 3 was in very small amount resulting in negligible effect to the surface area.…”

n-Butane Isomerization Catalyzed by Sulfated Zirconia Nanocrystals Supported on Silica or γ-Alumina

“…Sulfated mixed oxides of zirconia and alumina, alumina-supported SZ, and physical mixtures of SZ and γ-alumina were tested for n-butane [38][39][40][41][42] and n-hexane isomerization [43][44][45]; Ptcontaining physical mixtures of SZ and γ-alumina or silica have been tested as catalysts for the hydroisomerizationcracking of n-octane [46]. Sulfated zirconia-silica mixed oxides [47] and silica-(also MCM-41) supported SZ were found active for the isomerization of n-butane [40,42,48,49], n-pentane [50], or n-hexane [51] and for a number of other reactions [50][51][52][53][54][55][56][57][58][59]. SZ and aluminum-promoted SZ have been supported on MCM-41 and SBA-15 [60][61][62].…”