Effect of Template Structure on the Zeolite ZSM-12 Crystallization Process Characteristics

Effect of use of methyltriethylamonium chloride individually and combined with n-butylamine on the characteristics of the ZSM-12 zeolite crystallization process

“…Its pores are ellipse-shaped and constituted by 12-member rings (12-MR) with opening dimensions of 5,6 x 6,1 Å. Due to these structural characteristics, ZSM-12 has a high shape selectivity in obtaining sterically unimpeded linear molecules (Kulikov et al, 2019). Particularly, ZSM-12 is used as catalyst in the selective production of p-xylene (Glotov et al, 2021), 2,6-dimethylnaphthalene (Li et al, 2011), p-tert-butylphenol (Li et al, 2014), 4,4'-diisopropylbiphenyl (Chokkalingam et al, 2013, in the cracking (Sanhoob et al, 2018) and hydrocracking of hydrocarbons (Mehla et al, 2013).…”

“…ZSM-12 is usually synthesized from quaternary ammonium salts, which are involved in the formation of the aluminosilicate porous structure and affect the characteristics of the resulting material. Thus, a significant number of reports have focused on the study of nucleation and growth of crystals of this zeolite in the presence of various organic ammonium salts, such as methyltriethylammonium and N,N-dimethyl-N-ethyl(monoethanol)ammonium (Kulikov et al, 2019), tetraethylammonium (Toktarev & Ione, 1997;Kasunič et al, 2009), trimethylethylammonium (Počkaj et al, 2018), imidazole, pyridine and piperidine salts (Kore, R. & Srivastava, 2012), and diquaternary ammonium salts (Moini et al;1994;Han et al, 2005;Veselý et al, 2019).…”