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research. Numerous classes of catalysts (i.e., noble metals, transition metals and zeolites) have been investigated [ 3 – 7 ]. Noble metals, such as Pd, catalysts have a higher intrinsic activity for catalytic reduction of N 2 O in comparison with iron
some physical properties of soil and plant root growth 1998 Ayan, S. (2001): Utilization of zeolite as plant growing media
Characterization of synthesized A -zeolite
Simultaneous thermal analysis, X-ray diffraction, scanning electron microscopy and ICP-chemical analysis
Abstract
Confirmations of the successful synthesis of a particular zeolite demand investigation of the crystals by XRD, SEM, MAS-NMR and chemical analysis. In this work, we have used the DTA exothermic lattice breakdown of theA-zeolite, which gives typical peaks at around 900–1200°C for characterization. The effects ofpH, concentration, time of crystallization and temperature were studied and it was quickly and easily possible to distinguishA-zeolite formation from others originating from the synthesis matrix under different conditions by using DTA/TG analyses. The parameters were optimized for the synthesis of the zeolite and DTA measurements yielded enough information to identify theA-zeolite; this was confirmed by XRD and SEM.
aromatic yield under optimized conditions was only around 31.6% [ 20 ]. Some researchers disclosed that the catalytic performance of H-ZSM-5 zeolites is closely related to their structure and surface properties (e.g., crystal size, crystallinity
Abstract
The paper presents research results on dehydration properties and thermal behaviour of zeolites synthesized from fly ash, applying TG (thermogravimetry), DTG (derivative thermogravimetry) and SDTA (simultaneous differential thermal analysis) methods. In result of the analysis conducted water contents in zeolite samples were defined. On the basis of the data obtained from the thermogravimetric analysis, thermal behaviour of zeolites was assessed.
substitution that requires Lewis acids or strong mineral acids. Selective alkylation of aromatic hydrocarbons has been extensively studied over various zeolites and summarized in many reports [ 1 – 4 ]. A mechanistic overview on the acylation of anisole using α
Publishing House. Mátyás, E., 1979. Geological characterization of zeolites and rocks containing zeolite, with special regard to their properties important from the viewpoint of practical application. In: Proc. of User
aflatoxin B 1 ( Fouad et al., 2019 ). Among them, mycotoxin absorbents, such as charcoal ( Yamauchi et al., 2014 ), zeolite and bentonite ( Prasai et al., 2018 ) and calcium aluminosilicates ( Chen et al., 2014 ) can prevent the absorption of aflatoxins
Abstract
Concentrations of 38 elements in samples from four important Cuban zeolite beds have been obtained by Instrumental Neutron Activation (INAA) and X-ray Fluorescence analyses (XRFA). In comparison with other analytical techniques good agreement was reached. The concentration values of minor element Ba, Sr, Zn and Mn and 25 trace element (including 9 REE) are at the first time reported in Cuban zeolite. It is important for the zeolite evaluation in different industrial uses.
Abstract
The present study discusses the incorporation of uranyl ion into Y-zeolite framework. The UO 2 2+ sorption was measured by neutron activation analyses. The Y-zeolite framework distorts in response to the cations present in the structure. Hence, depending on the amount and the location of the exchanged cations, the features of the X-ray diffraction pattern may vary. From the Rietveld analysis of these patterns, the positions occupied by the UO 2 2+ cations in the zeolite network were determined.
