Influence of aluminium sources on the synthesis and catalytic activity of mesoporous AlMCM-41 molecular sieves

Tertiary butylation of phenol over mesoporous MeMCM-48 and MeMCM-41 (Me = Ga, Fe, Al or B) solid acid catalysts

“…The pH of final gel was 11.4. This was then subjected to hydrothermal treatment at 383 K for 72 h. The solid as-synthesized product was washed repeatedly, filtered and dried at 353 K for 12 h, and calcined at 823 K for 2 h in N 2 followed by air for 6 h. For a comparison, gallium-free MCM-48 as well as Na-AlMCM-41, Na-FeMCM-41, Na-GaMCM-41, Na-AlMCM-48, Na-FeMCM-48, Na-BMCM-41 and Na-BMCM-48 were also prepared according to a procedure described elsewhere [16,[28][29][30][31][32][33][34].…”

“…In addition, like many other porous solids acid catalysts, e.g. H-Y [26], H-ZSM-12 [27], SAPO-11 [28], H-AlMCM-41 [29,30], H-FeMCM-41 [31], H-GaMCM-41 [32], and H-AlMCM-48 [16], the mesoporous H-GaMCM-48 also possess moderate acidic sites which is expected to favor the chosen reaction. For a comparative study, we have also included the results of both MeMCM-48 (Me = B, Al and Fe) and MeMCM-41 (Me = B, Al, Ga and Fe) catalysts.…”

Mesoporous H-GaMCM-48: A remarkable solid acid catalyst for tertiary butylation of phenol

“…paratertiary-butyl phenol (p-t-BP) and 2,4-di-tertiary-butyl phenol (2,4-di-t-BP), are industrially important [25]. In addition, like many other porous solid acid catalysts, e.g., HY [26], ZSM-12 [27], SAPO-11 [28], H-AlMCM-41 [29,30], H-FeMCM-41 [31], H-GaMCM-41 [32], and H-AlMCM-48 [16], the mesoporous H-GaMCM-48 also possesses moderate acidic sites which is expected to favor the chosen reaction (Scheme 1). For a comparative study, we have also included Scheme 1. the results of B, Al, Ga, and Fe-containing MCM-41 as well as B, Al, and Fe-containing MCM-48 catalysts.…”

Structural characterization and catalytic properties of gallium-modified folded sheet mesoporous materials prepared using microwave-hydrothermal process

“…Since the discovery of the mesoporous MCM-41S family [30,31], B, Al, Ga and Fe atoms have been successfully incorporated into the frameworks of mesoporous silicas by direct one-step synthesis or via post-synthesis modification for obtaining mesoporous solid acid catalysts. Their catalytic tests in the tertbutylation of phenol have also been extensively investigated [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50]. Selvam and co-workers have reported that mesoporous MeMCM-48 and MeMCM-41 (Me = Ga, Fe, Al) solid catalysts possessed moderate acidity and were appropriate for the selective synthesis of 4-TBP [29,35,[39][40][41].…”