Aluminum chloride grafted mesoporous molecular sieves as alkylation catalysts

Mesoporous aluminosilica sensors for the visual removal and detection of Pd(II) and Cu(II) ions

“…Since the discovery of a novel class of the M41S family of mesoporous molecular sieves, the incorporation of aluminum into the framework has provided materials with acidic active sites [38][39][40]. These aluminosilica materials have been reported to show an exciting range of catalytic applications despite the existence of a structural disorder similar to those in amorphous alumina and aluminosilicas [39,41].…”

“…These aluminosilica materials have been reported to show an exciting range of catalytic applications despite the existence of a structural disorder similar to those in amorphous alumina and aluminosilicas [39,41]. The acidity of these solid materials is produced from cationic Bronsted or Lewis acid sites of tetrahedrally coordinated aluminum species (AlO À 4 ) in the aluminosilica frameworks [38,[42][43][44][45][46].…”

“…The generated (AlO À 4 ) units localize a negative charge, which could then be compensated by a proton or a cation. Thus, aluminosilicas acquire acidic and ion exchange properties [38][39][40]. It is reasonably believable that high aluminum contents in frameworks lead to increases in the acidity of the resultant solid acid aluminosilica materials; however, the ordering and hydrothermal stability of these materials are drastically decreased at low Si/Al ratios [43,46,47].…”

Positive effect of secondary structure creation in mordenites on alkylation of benzene with 1-tetradecene

“…Selectivity to the 2-phenyl isomer was comparable with mesoporous mordenite. Aluminum chloride-grafted mesoporous molecular sieves were tested as catalysts in alkylation of benzene with 1-dodecene in the study of Dubé and co-workers [21]. The prepared catalyst had a very high total acidity of ca.…”

Sulfated Mesoporous Tantalum Oxides in the Shape Selective Synthesis of Linear Alkyl Benzene

“…The monoalkylation selectivity for benzene alkylations was significantly enhanced to 89.9 % when AlCl 3 was grafted onto mesoporous molecular sieves. [14] Shape selective synthesis of LAB has been carried out over AlMCM-41/Beta zeolite composites, which combined the advantages of both microporous and mesoporous materials. [15] Though a high 2-phenyldodecane selectivity (76 %) was achieved, the upper conversion limit was only 48 % even at 120 8C after 2 h.…”