Synthesis of Composite Materials Resistant to a Change in Medium Acidity from Cu-BTC (MOF-199) and Activated Carbons
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hesis of Composite Materials Resistant to a Change in Medium Acidity from Cu-BTC (MOF-199) and Activated Carbons E. B. Markovaa, A. S. Lyadova, b, *, Yu. M. Serova, V. V. Kurilkina, and A. G. Cherednichenkoa aPeoples’
bTopchiev
Friendship University of Russia, Moscow, 117198 Russia Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow, 119991 Russia *e-mail: [email protected] Received September 1, 2019; revised April 30, 2020; accepted June 11, 2020
Abstract—To enhance the resistance of a metal-organic frameworks(MOF) to a change in the medium pH composite materials are synthesized from Cu-BTC (MOF-199) and activated carbons of various brands (AR-V, AGN-2, ART-1, BAU-A, MeKS). It is shown that the highest stability is exhibited by a material synthesized using activated carbon AR-V with the highest acidity of the surface as a matrix. The targeted increase in the acidity of the surface of carbon matrices due to their preliminary oxidation leads to the formation of metal-organic composite materials more resistant to acidic or alkaline media. Keywords: composite materials, activated carbons, MOF-199, resistance to acidic media DOI: 10.1134/S0965544120100072
Porous solid materials have found application in various fields of science and technology, for example, as adsorbents, catalysts, and supports for catalytic systems and in the processes of purification and separation of chemical compounds. The development of new classes of hybrid organic-inorganic highly ordered materials with tailored physicochemical characteristics is of extreme importance for the successful development of new technological areas [1]. Metal-organic frameworks (MOF) or porous coordination polymers (PCP), which represent a new class of porous hybrid materials, are currently considered promising hybrid materials [2]. These materials possessing high porosity and large surface area are intensively used in the development of new technologies for gas storage and separation [1–3]; active studies on the possible use of MOF as catalysts in various chemical and petrochemical processes are underway [4–6]. Even through MOF-based systems sometimes show high catalytic activity, they are often not resistant to external stimuli related to chemical transformation conditions. For example, their low thermal stability and responsibility to a change in medium pH may cause a rapid irreversible deactivation of the catalyst and the impossibility of its repeated use [7, 8]. The synthesis of new composite and hybrid materials on the basis of MOF provides a good opportunity to enhance their stability and catalytic efficiency. The aims of this study are to create MOF-199based materials resistant to a change in the medium pH due to introduction of a coordination compound
into the composition of the carbon matrix and to investigate of their physicochemical properties. EXPERIMENTAL The synthesis of Cu-ВТС (BTC is the anionic part of benzene-1,3,5-tricarboxylic acid) was carried out according to [9] to obtain microporous MOF-199 samples. The initial componen
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