The elastic behavior of zeolitic frameworks: The case of MFI type zeolite under high-pressure methanol intrusion

High-pressure behavior and crystal-fluid interaction in natural erionite-K

“…In the description of crystal-fluid interaction phenomena, it is important to constrain the pressure range at which it occurs. As reported by Comboni et al [8] for methanol-MFI interaction, evidence of P-induced adsorption of molecules was already detected at P < 1 MPa (i.e., pressures that can be reached in industrial processes). In natural zeolites as well, e.g., boggiste, heulandite and stilbite [45,47,48], adsorption phenomena have been described at P < 1 GPa.…”

“…Finally, a comparison with the reported crystal-fluid interactions in other natural and synthetic zeolites shows that the magnitude of the intrusion phenomena observed in this study is surprisingly high for a natural zeolite. These results disclose interesting scenarios, making natural erionite, a relatively common zeolite, a promising candidate for tailoring crystal-fluid interaction processes having potential technological and industrial applications [5,8,9] and even to investigate the role of zeolites as fluids carriers in early subduction environments, given the reported presence of erionite in altered oceanic basalts and sediments [49,50]. a cylinder is given by VC = π•r 2 •h (where r is the radius of the basis and h is the height of the cylinder) and the volume of a truncated cone is VTC = [π•h•(r1 2 +r1•r2+r2 2 )]/3 (where h is the height of the truncated cone and r1 and r2 the radii of the two bases), the volume of the so-modelled erionite-cage can be obtained according to the following formulae: Tab.…”

“…While "non-penetrating" PTFs allow to investigate the intrinsic compressibility, P-induced phase transitions and amorphization processes of a given zeolite, the penetrating ones can be adopted to explore the labyrinthine world of the Pinduced crystal-fluid interactions [6,7,4, for a review]. These phenomena can be exploited to improve catalytic performances of microporous materials [8] or for tailoring new functional compounds, e.g. with a controlled extra-framework content or a stiffened structure [4,9], or even to describe a series of natural phenomena in which zeolites act as carrier of fluids [6,7].…”

The Effect of Zeolite Features on the Dehydration Reaction of Methanol to Dimethyl Ether: Catalytic Behaviour and Kinetics

“…The MFI zeolitic framework supported on membranes shows very interesting properties in the methanol to DME reaction, especially in DME selectivity [42]. This kind of zeolite also preserves its structural properties at very high pressure for the methanol intrusion [43], this means that it can operate in industrial high-pressure processes, such as hydrocracking and catalytic dewaxing. The crystal size of catalysts and the Si/Al ratio for FER type zeolite (the zeolite that shows the better parameters concerning conversion, selectivity and coke deposition) was compared in order to understand the effect of these parameters on the catalytic behaviour.…”

Steering polymer growth by molding nanochannels: 1,5-hexadiene polymerization in high silica mordenite

“…[13][14][15] Moreover, the fine tuning of their pore architecture and their hydrophilic/hydrophobic character can improve their performance for technological or industrial applications. [4,[16][17][18][19][20][21][22][23][24] The geometrical constraints of the zeolitic framework can be proficiently exploited to induce the formation of nanostructured arrays with the desired dimensionality. Supramolecular materials which do not require chemical reactions to form compositessuch as dye-zeolite composites/artificial antenna systems in zeolite channels, [25][26][27][28][29][30][31][32][33] biomolecules and chromophores immobilized in 1-D channels, [34][35][36][37][38][39][40][41] or low-dimensional nanoarchitectures of molecular clusters [42][43][44] -have been successfully realized.…”