Control of framework Al distribution in ZSM-5 zeolite via post-synthetic TiCl4 treatment

Anisotropic ZSM-5 nanorod assemblies: facile synthesis, epitaxial growth, and strikingly enhanced stability in benzene alkylation

“…6b), where the percentage of extra-framework Al increases (six-coordinate Al, at 0 ppm), while that of framework Al decreases (four-coordinate Al, at 55 ppm). 58 Therefore, the addition of CTAB to the synthesis gel can efficiently adjust the acidic properties of NA-ZSM-5 x zeolites, especially weakening the acidic properties of the samples, thus favouring the following alkylation of benzene with ethanol.…”

“…It is widely reported that the number of strong acid sites plays a dominant role in some reactions including oligomerization, isomerization, cracking and aromatization. 18,[46][47][48][49][50][51]57,58 Hence, the density of acid sites on different samples is quantified and compared. As shown in Table 2, a decrease in the total acid sites can be obviously observed with the introduction of CTAB into the synthesis gel, which should be ascribed to the decrease in the Al content in NA-ZSM-5 x .…”