Acidic mesostructured aluminosilicates assembled from economic acidic template characterized by catalytic cracking reactions

• AlMFA-8(x) catalysts are synthesized using acidic template.
• The physicochemical of the AlMFA-8(x) is compared with AlSBA-15(x) catalysts.
• The prepared materials exhibited high surface area and large pore diameter.
• Wax, TIP and hexadecane cracking reaction are used to compare the catalytic activity.
• High catalytic activity is attributed to their morphology and nature of acid sites.

Mesoporous 3D aluminosilicates, denoted as AlMFA-8, were one-pot synthesized with two different nSi/nAl ratios using linear alkylbenzene sulfonic acid, LASH, as template. The AlMFA-8 materials were characterized using XRD, N2-adsoption, SEM, HRTEM, XRF, XPS and FT-IR. The results showed that AlMFA-8(x) has large-pore mesoporous solids. The pore volume increases from 1.28 to 1.45 cm3/g without significant concomitant decrease of the surface area (≈659 m2/g). On the other hand, AlSBA-15(x) materials with the same nSi/nAl ratios were one-pot synthesized by adjusting the molar of nH2O/nHCl in synthesis gel at 276 using P123 as template.The surface acidity of AlMFA-8(x) and AlSBA-15(x) were evaluated and confirmed by NH3-TPD, Pyr-FT-IR, TGA-wax-catalytic cracking, 1,3,5-triisopropylbenzene and n-hexadecane cracking. In addition, commercial silica–alumina (CSi–Al) was characterized and its catalytic activity is compared with the different acid mediated synthesis route, AlMFA-8(x) and AlSBA-15(x). The AlMFA-8(x) showed the higher activity under equivalent conditions in comparison to AlSBA-15(x) and CSi–Al materials.

Mesoporous silica–alumina samples, AlMFA-8(x), were prepared using linear alkylbenzene sulfonic acid with different Si/Al molar ratios of 7&14, and compared with both AlSBA-15(7&14) and silica alumina materials. The study aimed to discuss the influence of the preparation procedures on their structural, textural, physicochemical features and catalytic activities. Higher Al2O3 contents in AlMFA-8(x) led to higher catalytic activity for 1,3,5-triisopropylbenzene, wax and n-hexadecane cracking reactions.Figure optionsDownload as PowerPoint slide