Browsing by Autor "Jonas Hedlund"
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Item type: Item , Internal structure of a gel leading to NBA-ZSM-5 single crystals(Springer Science+Business Media, 2018) Wilson Aguilar-Mamani; Jonas Hedlund; Johanne MouzonPorous gel structures are formed during the synthesis of the zeolite ZSM-5 due to the reaction between a source of aluminosilicate, sodium hydroxide, water and a structure directing agent, such as e.g. tetrapropylammonium (TPA) or n-butylamine (NBA). In the present work, the formation of the gel in a heterogeneous system leading to the crystallization of NBA-ZSM-5 zeolite from leached metakaolin was studied extensively. The solid and liquid phases obtained after separation were analyzed by inductively coupled plasma sector field mass spectrometry, dynamic light scattering, extreme high resolution-scanning electron microscopy, energy dispersive spectroscopy, high resolution-transmission electron microscopy, X-ray diffraction and nitrogen gas adsorption. The main gel phase formed after hydrothermal treatment exhibited a sponge-like structure resembling those forming in (Na, TPA)-ZSM-5-based systems. For the first time, the walls of the main gel were shown to be inhomogenous and to possess a biphasic internal structure consisting of a mesoporous skeleton of aluminosilicate nanoparticles embedded in a silicate-rich soluble matrix of soft matter. The data presented in this paper is of primary importance to understand the mechanism by which the gel is consumed and contributes to the growth process of the zeolite crystals.Item type: Item , Microstructural evolution of condensed aggregates during the crystallization of ZSM-5 from a heterogeneous system(Elsevier BV, 2021) Edgar Cárdenas; Wilson Aguilar-Mamani; Cheuk‐Wai Tai; Saúl Cabrera; Jonas Hedlund; Johanne MouzonItem type: Item , Preparation of zeolite A with excellent optical properties from clay(Elsevier BV, 2014) Gustavo García; Wilson Aguilar-Mamani; Ivan Carabante; Saúl Cabrera; Jonas Hedlund; Johanne MouzonItem type: Item , Selective synthesis of FAU-type zeolites(Elsevier BV, 2018) Gustavo García; Saúl Cabrera; Jonas Hedlund; Johanne MouzonItem type: Item , Solution-mediated growth of NBA-ZSM-5 crystals retarded by gel entrapment(Elsevier BV, 2018) Wilson Aguilar-Mamani; Farid Akhtar; Jonas Hedlund; Johanne MouzonItem type: Item , Synthesis of zeolite Y from diatomite as silica source(Elsevier BV, 2015) Gustavo García; Edgar Cárdenas; Saúl Cabrera; Jonas Hedlund; Johanne Mouzon