Comparison of the Performance of Au, Pt and Rh Nanoparticles Supported on Mn/Alkali Titanate Nanotubes in Formaldehyde O
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Comparison of the Performance of Au, Pt and Rh Nanoparticles Supported on Mn/Alkali Titanate Nanotubes in Formaldehyde Oxidation at Room Temperature R. Camposeco1 · S. Castillo2,3 · N. Nava2 · V. Maturano1 · R. Zanella1 Received: 10 March 2020 / Accepted: 4 May 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Au, Pd and Rh nanoparticles were supported on Mn/Na2Ti3O7 alkaline titanate nanotubes by the deposition–precipitation with NaOH method. The Pt-Mn/NT alkaline titanate showed outstanding catalytic performance accomplishing complete formaldehyde oxidation at 40 °C with apparent activation energy of 27 kJ mol−1. The following tendency was observed for catalytic activity Pt > Au > Rh. The characterizations revealed the importance of the noble metals in the formation of vacancies and OH groups and their ability to activate the alkaline titanate surface oxygen species, which had an impact on the formation of acid sites (Brönsted and Lewis); another key factor for formaldehyde oxidation was metal dispersion. The presence of OH species facilitated the transformation of formaldehyde adsorbed on the M-Mn/alkaline titanate nanotubes, probably through the reaction with adsorbed O species, which promoted the decomposition of formaldehyde to C O2 at room temperature. Graphic Abstract
Keywords Formaldehyde · Nanoparticles · Alkali titanate · OH groups · Acidity * R. Zanella [email protected]
1 Introduction
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Formaldehyde is an indoor air pollutant habitually emitted from fully building and decorative materials; likewise, it has been classified as a human carcinogen that causes nasopharyngeal cancer [1, 2]. Moreover, indoor air cleaning with low energy demand and low formaldehyde concentration necessarily requires a catalyst that exhibits high activity for
Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, Circuito Exterior S/N, C. U., 04510 Mexico City, Mexico
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Product Technology, Mexican Institute of Petroleum, 07730 Mexico City, Mexico
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Department of Chemical Engineering, ESIQIE-IPN, 75876 Mexico City, Mexico
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complete formaldehyde oxidation at low temperatures [3]. On the other hand, indoor air is often enriched with water vapor, which leads to catalytic deactivation because of the strong adsorption of water on active catalyst sites, mainly at low temperatures [4, 5]. Recently, studies related to formaldehyde removal have been carried out using supported noble metals such as Pt, Rh, Au, and Pd [6, 7] supported on transition metal oxides like MnO2, CO3O4, CeO2 [8, 9], in which the Pt/TiO2 catalyst is considered as the most active catalyst for formaldehyde oxidation at low temperatures [10]. In this way, manganese oxides are employed as catalysts in environmental reactions such as oxidation of carbon monoxide and VOCs because of their low cost and high activity, their catalytic properties are attributed to their ability to produce labile lattice oxygen and store oxygen; also, it has been sho
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