Vol.:(0123456789) 1 3 Topics in Catalysis https://doi.org/10.1007/s11244-020-01251-w ORIGINAL PAPER Templated Synthesis of Copper Modifed Tin‑Doped Ceria for Catalytic CO Oxidation Igor Yu. Kaplin 1  · Ekaterina S. Lokteva 1  · Artem V. Tikhonov 1  · Kirill A. Zhilyaev 1  · Elena V. Golubina 1  · Konstantin I. Maslakov 1  · Alexey O. Kamaev 1  · Oksana Ya. Isaikina 1 © Springer Science+Business Media, LLC, part of Springer Nature 2020 Abstract Ceria-tin (CS) oxide catalytic systems were synthesized using cetyltrimethylammonium bromide (CTAB) and Pluronic 123 (P123) templates and modifed with CuO x using two techniques: the “one-pot” method (Cu addition during CS synthesis) and the post-impregnation (IM). The catalysts were tested in CO oxidation in the stoichiometric CO/O 2 mixture balanced with He. XRD, TPR, Raman spectroscopy, XPS, N 2 physisorption, H 2 -TPR, HR TEM and SEM–EDS were used for catalysts characterization. CS P123 showed better CO conversion than CS CTAB at 100–200 °C and lower at higher temperatures, due to higher defectiveness and oxygen mobility in CS CTAB. Modifcation with copper improves catalytic action of all catalysts at low temperatures, but to a diferent degree depending on modifcation technique and template type. Cu–CS CTAB prepared by the “one-pot” technique was much more efcient than its IM counterpart and both P123-templated catalysts. The best efciency of Cu–CS CTAB results from the strongest interaction of Cu with CS to form CuCeSnO x which provides accessibility of Cu + adsorption sites, and low stability of surface carbonate groups improving low-temperature efciency. Cu–CS P123 IM efciency decreases in the oxygen-enriched reaction mixture, the reasons are discussed in terms of the ratio between oxidation and reduction stage rates in MvK mechanism. Keywords Template · CTAB · Pluronic 123 · Tin-doped ceria · Copper oxide · CO oxidation 1 Introduction Catalytic oxidation of carbon monoxide is one of the most important processes in the feld of environmental pollution control technologies. Catalysts containing noble metals, such as Pd, Pt and Au [1–3], are known to be active in CO oxida- tion. However, scientists are now searching for cheaper and more stable systems that are not inferior in catalytic activity to expensive noble metal catalysts. Ceria-based systems have received much interest in this area. Cerium oxide has the unique redox properties including easy transition between Ce 3+ and Ce 4+ states and high oxygen mobility [4–6], pro- viding the ability to reversibly transfer the lattice oxygen. Thus, under appropriate conditions it can participate in cata- lytic reactions as an oxidant. The thermal stability, reducibility at low temperatures and oxygen storage capacity of ceria can be improved by substi- tution of Ce 4+ ions with other cations [6, 7]. The commonly used dopant for CeO 2 is Zr 4+ [4, 6]. It introduces structural distortions into the host lattice inducing the formation of crystal defects that can improve catalyst efciency in CO Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11244-020-01251-w) contains supplementary material, which is available to authorized users. * Igor Yu. Kaplin kaplinigormsu@gmail.com * Ekaterina S. Lokteva e.lokteva@rambler.ru Artem V. Tikhonov tixonow.artem1@yandex.ru Kirill A. Zhilyaev lirokshd@gmail.com Elena V. Golubina golubina@mail.ru Konstantin I. Maslakov nonvitas@gmail.com Alexey O. Kamaev kamaevalexey@gmail.com Oksana Ya. Isaikina hardi1@yandex.kz 1 Chemistry Department, Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow, Russia 119991