Shape-selective diisopropylation of naphthalene in H-Mordenite: Myth or reality?

Shape-selective synthesis of 2,6-diisopropylnaphthalene on H-mordenite catalysts

“…To verify the influence of using isopropanol instead of propylene and dilution with cyclohexane solvent, we performed alkylation of naphthalene according to the procedure similar to that applied by Bouvier et al [33]. Naphthalene (1.28 g, i.e., 10 mmol), isopropanol (1.19 g, 20 mmol), 2 g of the H-MOR(100) catalyst, and cyclohexane 100 cm 3 were placed in the autoclave.…”

“…Influenced by such diversity of information and confusion, shape-selective formation of 2,6-DIPN in isopropylation of naphthalene was recently challenged by Bouvier et al even for H-MOR catalysts [33]. Considering their own results, theoretical calculations and possible imperfections of analytical procedures used in some experiments described in the literature they concluded that the shape-selective formation of 2,6-DIPN in H-MOR was a myth.…”

“…It was also suggested [34] that conditions of experiments performed in Ref. [33] were completely different from those favorable for shape selectivity due to the dilution of reactants with cyclohexane, using isopropanol as an alkylating agent and using a relatively low silica mordenite samples.…”

“…Moreover, to test possible influence of using isopropanol instead of propylene and dilution of reactants with cyclohexane, we carried out experiments similar to those described in Ref. [33] but using high-silica mordenites as catalysts. The last test seems important because a positive influence of water addition or using isopropanol as alkylating agent on shape-selective formation of 2,6-DIPN can be found in the literature [16,36].…”

Appraisal of microwave-assisted ion-exchange in mordenite by crystal structure analysis

“…Sodium Tecto-alumosilicate Hydrate (Mordenite) is a natural zeolite whose synthetic analog is extensively used as a molecular sieve in separation applications and as a catalyst for various reactions such as hydro cracking, isomerization and alkylation [14][15][16]. The crystal structure of mordenite was first determined by Meier [17] then refined by several authors (e.g.…”