Synthesis of stable H-galloaluminosilicate MFI with hierarchical pore architecture by surfactant-mediated base hydrolysis, and their application in propane aromatization

A highly efficient Ga/ZSM-5 catalyst prepared by formic acid impregnation and in situ treatment for propane aromatization

“…At this stage of the research, it could not be easily established 45 as to how exactly the (GaO) + species present on the catalyst are converted to the reduced state species (Z−Ga + ) during aromatization as other literatures 17,22,25,[48][49][50] however, on at least one count, the (GaO) + species are quite a useful intermediate for propane aromatization. The work is still on-going.…”

“…Their findings of the superior activity of the catalyst were attributed to its relatively strong acidity and uniform distribution 45 of extra framework Ga-oxide species in the zeolite channels. Al-Yassir et al 17 …”

New insights into hierarchical metal-containing zeolites; synthesis and kinetic modelling of mesoporous gallium-containing ZSM-5 for propane aromatization

“…7), and H 2 -TPR (Fig. 17) be ascribed to the reduction of (GaO) + → Ga + [12]. The peak at ~ 760 °C is due to surface dihydroxylation).…”

“…Recently, our group has shown for the first time that alkane aromatization over galliumcontaining zeolites can be significantly improved upon the introduction of secondary network of mesopores connected to the native micropores of Ga-containing zeolites [11,12].…”

“…Introduction of ordered intercrystalline mesopores into galloaluminosilicate (MFI framework type) by CTABmediated hydrolysis approach displayed a remarkable increase in the C 3 aromatization, with conversion of 56.3 %, as compared to 30.8 % provided by galloaluminosilicate [12]. At comparable conversion (~ 25 %), ordered mesoporous galloaluminosilicate was more selective to aromatics, with 58.3 % as compared to 42.5 % for microporous sample.…”