Title: A comparative analysis of the protonated and copper exchanged mordenites with SiO₂/Al₂O₃ molar ratio equal to 10

Authors: Yuri M. Zhukov; Alexander N. Kovalyov; Anastasiia Y. Kultaeva; Marina G. Shelyapina; Vitalii Petranovskii

Addresses: Department of Nuclear Physics Research Methods, Saint Petersburg State University, 198504, Ulyanovskaya 3, Petergof, Russia ' Department of Nuclear Physics Research Methods, Saint Petersburg State University, 198504, Ulyanovskaya 3, Petergof, Russia ' Department of Nuclear Physics Research Methods, Saint Petersburg State University, 198504, Ulyanovskaya 3, Petergof, Russia ' Department of Nuclear Physics Research Methods, Saint Petersburg State University, 198504, Ulyanovskaya 3, Petergof, Russia ' Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Km. 107 Carretera Tijuana a Ensenada, C.P. 22860, Ensenada, Baja California, Mexico

Abstract: Ion-exchange zeolites are the starting materials for the synthesis of nanocomposites. Moreover, they are of great interest in themselves, because cations in zeolites, and especially cations of transition metals, are the active catalytic sites. Copper-exchange zeolites are known as very effective deNOx catalysts. Although these compounds have been extensively studied in the last decade, the localisation of the copper ions in the zeolite matrix and their state are not fully determined. Here, we report on the results of our complementary study by various experimental methods, such as thermal analysis, nuclear magnetic resonance (NMR), electronic paramagnetic resonance (EPR), and theoretical density functional calculations of protonated and copper-exchanged mordenites with the molar SiO₂/Al₂O₃ ratio equal to 10.

Keywords: ion-exchanged zeolites; thermal analysis; electronic paramagnetic resonance; EPR; nuclear magnetic resonance; NMR; density functional theory; DFT; copper exchange; SiO2; silicon dioxide; silica; Al2O3; aluminium oxide; alumina; molar ratio; nanocomposites; nanotechnology; mordenites.

DOI: 10.1504/IJNT.2016.074529

International Journal of Nanotechnology, 2016 Vol.13 No.1/2/3, pp.136 - 146

Published online: 04 Feb 2016 *

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