Nanoarchitectural approach for synthesis of highly crystalline zeolites with a low Si/Al ratio from natural clay nanotubes

Catalytic Cracking of Crude Oil: Mini Review of Catalyst Formulations for Enhanced Selectivity to Light Olefins

“…34−38 Their chemical composition is particularly important in determining their acidity, active sites, structure, and stability. 39,40 The common and well-studied zeolites are the aluminosilicates, which are characterized by their Brønsted acid sites as a result of the available proton that balances the negative charges generated as a result of the insertion of trivalent Al atoms into a silica tetrahedral environment. 41 The Brønsted acid sites are particularly important in zeolite selectivity to light olefins during catalytic cracking of various ranges of hydrocarbons.…”

“…The zeolites are a class of crystalline microporous materials with a well-defined framework that encloses uniform cavities and channels. − Because of the ease of tuning their chemical composition and pore structure, this class of materials has found numerous industrial applications, especially as catalysts in the refining and petrochemical processes. − Their chemical composition is particularly important in determining their acidity, active sites, structure, and stability. , The common and well-studied zeolites are the aluminosilicates, which are characterized by their Brønsted acid sites as a result of the available proton that balances the negative charges generated as a result of the insertion of trivalent Al atoms into a silica tetrahedral environment . The Brønsted acid sites are particularly important in zeolite selectivity to light olefins during catalytic cracking of various ranges of hydrocarbons .…”

Architectural design of core–shell nanotube systems based on aluminosilicate clay

“…It was shown that molar ratio adjustment of silica to alumina with gels or clay nanotube etching significantly impacts the resulting zeolite crystalline morphology (globules, hexagonal coffins, and pompon-like microfibers), while organic template variations did not have a considerable contribution. 43 Microporosity and structural variety could be beneficially broadened with silica-rich zeolite produced from halloysites with the ability to control the structural framework formation. 8,43–45…”

“…43 Microporosity and structural variety could be beneficially broadened with silica-rich zeolite produced from halloysites with the ability to control the structural framework formation. 8,43–45…”

“…For tuning the resulting zeolite structures, traditional organic templates were employed. 43,44 We have synthesized aluminosilicates of analcime, sodalite, mordenite, and mordenite framework inverted types, allowing for highly crystalline low-silica zeolites (Fig. 5).…”