Ga doped SBA-15 as an active and stable catalyst for Friedel–Crafts liquid-phase acylation

Selective Preparation of Furfural from Xylose over Sulfonic Acid Functionalized Mesoporous Sba-15 Materials

“…The above results of 29 Si MAS NMR indicate that the SBA-15-SO 3 H(C) and SBA-15-SO 3 H(G) samples have a similar content of silanol groups. However, they have a different catalytic activity for the dehydration of xylose to furfural reaction.…”

“…This indicates that the pore size of the material is less ordered and uniform. The opening of the hysteresis loop at a lower P/P 0 relative pressure is also observed in the fresh SBA-15-SO 3 H(C) sample, indicating the pore size diminution on the sample [29].…”

“…TG-DTA was performed with a Netzsch STA409PC TG system at a heating rate of 10 °C min −1 under airflow. 29 Si and 13 C solid-state NMR spectra were recorded at 79.30 and 100.37 MHz, respectively, on a Bruker Avance 400P (9.4 T) spectrometer. 29 Si CP MAS NMR spectra were recorded with 5.5 μs 1H 90° pulses, a contact time of 8 ms, a spinning rate of 5 kHz, and 4 s recycle delays.…”

Heterogeneous advanced photo-fenton oxidation of phenolic aqueous solutions over iron-containing SBA-15 catalyst

“…Since the radius of the ionic Fe 3+ (r 3+ Fe = 0.63Å) is larger than that of Si 4+ (r 4+ Si = 0.40Å), the increase in the unit cell parameter value of the Fe-SBA-15 (60) material ( Table 1) may indicate that Fe 3+ ions are incorporated into the frame work of the SBA-15 material; generally, it is expected that the unit cell parameter will be enlarged after the incorporation of metal cations with ionic radius larger than that of Si 4+ . However the Fe rich containing SBA15 (Fe-SBA-15 (20)) presents a decrease in its unit cell parameter; this result could be attributed to a partial collapse of hexagonal porosity caused by the modification induced by the iron introduction in the mesoporous silica structure [8,9].…”

Mg‐Fe‐hydrotalcite as catalyst for the benzylation of benzene and other aromatics by benzyl chloride reactions

“…[1 -3] The new environmental legislation pushes for the replacement of all liquid acids by solid acid catalysts which are environmentally more friendly catalysts and which lead to minimal pollution and waste. [4,5] Indeed, several solid acid catalysts have already been proposed which are efficient catalysts such as: Fe-modified ZSM-5 and H-β zeolites; Fe 2 O 3 or FeCl 3 deposited on micro-, meso-and macroporous [6] ; Fe-containing mesoporous molecular sieves materials [7,8] ; Fe-, Zn-, Ga-and In-modified ZSM-5 type zeolite catalysts [9] ; Ga-SBA-15 [10] ; InCl 3 , GaCl 3 , FeCl 3 and ZnCl 2 supported on clays and Si-MCM-41 [11] ; transition metal chloride-supported mesoporous SBA-15 [12] ; Sb supporting K10 [13] ; solid superacid and silica-supported polytrifluoro-methanesulfosil oxane [14] ; H 2 SO 4 , HNO 3 and HClO 4 /metakaolinite [15] ; alkali metal salts and ammonium salts of keggin-type heteropolyacids [16] ; ionexchanged clays [17] ; clayzic [18] ; solid superacids based on sulfated ZrO 2 [19] ; HY [20] ; Fe, Ce, W-modified Hβ zeolites [21] ; H-ZSM-5 [22] and FeCl 3 , MnCl 2 , CoCl 2 , NiCl 2 , CuCl 2 , ZnCl 2 supported on acidic alumina [23] for the benzylation of benzene and other aromatic compounds. However, the reports on the use of basic catalysts for the benzylation reactions are scarce.…”