Mtw型ゼオライト構造を有するアルミノシリケートおよびフェリシリケートを用いた2-メチルナフタレンのメチル化反応とその速度解析

Abstract

Aluminosilicate and ferrisilicate with the MTW-type zeolite structure were hydrothermally prepared and used to catalyze the methylation of 2-methylnaphthalene (2-MN) under supercritical conditions in a batch-type reactor. Dimethylnaphthalene (DMN) and 1-methylnaphthalene (1-MN) yields increased with decreasing Si/Al ratio of the zeolite. In contrast, ferrisilicate with the MTW-type zeolite structure (Si/Fe 100) exhibited higher DMN selectivity and the β,β-DMN fraction in total DMNs was higher than that over aluminosilicate with MTW structure (Si/ Al 100). Kinetic analysis of 2-MN methylation over MTW zeolites was conducted, to obtain the reaction rate constants and apparent activation energies. The activation energy for the methylation of 2-MN over aluminosilicate with MTW structure was 176 kJ mol -1 , which was almost the same as that for the ferrisilicate with MTW structure. This indicates that the mechanism for methylation is independent of hetero-atoms species in the MTW zeolite framework. The introduction of Fe atoms into the framework significantly decreased the rate constant for the isomerization of 2-MN compared with that for the methylation of 2-MN. Therefore, ferrisilicate with MTW structure is effective for 2-MN methylation due to the decrease of the isomerization rate.

Upgrading of Ultra-heavy Oil with Iron-based Oxide Catalysts Using the Chemical Reaction Engineering Approach

“…The molecular weight distributions of the bitumen and oil product from HPLC were converted into carbon number distributions by assuming the unit structure of heavy oil as _ CH2 _ . The product yield was divided into three groups according to the carbon number: gas oil (Gas Oil, carbon numbers 14-20), vacuum gas oil (VGO, [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] and vacuum residual oil (VR, 41). Carbonaceous solid deposited on the reactor wall was designated as residue, and coke deposited on the surface of the catalyst was analyzed with an elemental analyzer.…”