Preparation of Cylindrical Extrudates of Mesoporous Silica-alumina without Use of Binder and Their Activity in Cracking of Cumene.

0460629 - ÚCHP 2017 RIV NL eng J - Journal Article
Vít, Zdeněk
Preparation of Cylindrical Extrudates of Mesoporous Silica-alumina without Use of Binder and Their Activity in Cracking of Cumene.
Journal of Porous Materials. Roč. 23, č. 4 (2016), s. 1125-1132. ISSN 1380-2224. E-ISSN 1573-4854
R&D Projects: GA ČR GAP106/11/0902
Institutional support: RVO:67985858
Keywords : mesoporous * silica-alumina * binderless exstrusion
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 1.624, year: 2016

A series of mesoporous silica–aluminas (MSA) containing 24–59 wt% Al2O3 was synthesized from sodium metasilicate and aluminum nitrate and extruded in 1/16 cylinders without use of a binder. This was followed by slow hydrogel drying, extraction by water and calcination at 500 °C. This procedure gave stable hard extrudates and the absence of binder allowed to keep the surface area, mesoporosity and cracking activity of MSA at the original high values. The resistance to crushing was much better as compared to commercial molecular sieve 13X. The extrudates have average pore size around 3.5 nm. Their properties were affected by the contents of Al2O3 and residual sodium. The MSA containing 50 wt% Al2O3 possessed the maximum values of surface area, pore volume and activity in cumene cracking. The calcined extrudates showed good water sorption capacity and were stable in aqueous environment. This predestinates the MSA extrudates as the shaped mesoporous acidic carriers for preparation of different supported catalysts.
Permanent Link: http://hdl.handle.net/11104/0260988