Conversion of pentane into aromatics over ZSM—5 zeolites

Selective Production of Aromatics from 2-Octanol on Zinc Ion-Exchanged MFI Zeolite Catalysts

“…Moreover, the reaction of 2-octanol proceeded through the decomposition of the reactant to small molecules and the aromatization of the resultant alkanes and alkenes. Several studies reported the similar aromatization reactions of alkanes and alkenes catalyzed by zinc [13,15,[17][18][19] or gallium [14] ion-exchanged MFI zeolites, which were consistent with the present results. The active zinc species were suggested to be [Zn(OH)] + ions [15] [17], which catalyzed the dehydrogenation of lower alkanes to corresponding alkenes.…”

“…The yields of aromatics greatly decreased with an increasing ratio; the yields were 34%, 30%, 25%, and 2% at silica/alumina ratios of 30, 40, 90, and 1880, respectively. These results indicated that the number of acid sites on the zeolites was an important factor in controlling the catalytic activity for aromatization due to the widely recognized dependency of the acid-catalyzed reaction on the amount of aluminum ions [14]. The H-MFI zeolite with a silica/alumina ratio of 40 was employed hereafter as the parent zeolite for further experiments because its stability during the catalytic reaction was better than that of H-MFI at a silica/alumina ratio of 30.…”

“…In contrast, aromatics become major at higher temperatures, which accompanies a decrease in the amount of C2-C5 compounds. All of these observations indicated reaction pathways, dehydration of 2-octanol to 2-octene, decomposition of resulting 2-octene to C5 and C3 compounds, further decomposition of the C5 to C2 and C3 compounds [14], and, finally, aromatization of C2 and C3 compounds with dehydrogenation [15][16][17]19,20]. ; P2OcOH 5%; N2 95%; 1 atm.…”

“…Our attention was focused on zeolite catalysts based on the following reports. The selectivity of aromatics on zeolite catalysts was the highest among those on reported catalysts due to the shape selectivity [13][14][15][16][17][18][19][20][21]. Platinum-loaded K-LTL zeolites were reported as highly active catalysts for the aromatization of n-hexane [23][24][25][26][27][28].…”

“…The aromatization of various compounds, including alcohols [5][6][7][8][9][10][11][12], alkanes [13][14][15][16][17][18][19][20][21], and alkenes [22], has been reported on various heterogeneous catalysts, such as silica-alumina, zeolites, hydroxyapatite, and heteropolyacids. Our attention was focused on zeolite catalysts based on the following reports.…”