“…Also, oil conversion and type of products obtained over these catalysts were attributed mostly to the acidity and shape selectivity of the catalysts used. ,,,, For example, it has been shown 8,9,12,13 that the higher the acidity (especially the Brønsted acidity) of the catalyst, the greater the feed conversion. Also, the formation of aromatic hydrocarbons was ascribed specifically to the presence of high-strength Brønsted acid sites on the catalysts. ,,,, These results are in contrast to those of Chang and Wan, Egloff and Morrel, Egloff and Nelson, Lipinsky et al, Schwab et al, and Crossley et al., as well as studies using silicalite catalyst by Katikaneni et al …”