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Molecules 2016, 21(4), 486; doi:10.3390/molecules21040486

Causes of Activation and Deactivation of Modified Nanogold Catalysts during Prolonged Storage and Redox Treatments

1
Department of Physical and Analytical Chemistry, Tomsk Polytechnic University, Tomsk 634050, Russia
2
Centro de Nanociencias y Nanotecnología, UNAM, Ensenada 22860, Mexico
3
Laboratory of Catalytic Research, Tomsk State University, Tomsk 634050, Russia
4
Institute of Catalysis and Petroleumchemistry (ICP), CSIC, 28049 Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Sónia Carabineiro
Received: 6 February 2016 / Revised: 29 March 2016 / Accepted: 8 April 2016 / Published: 13 April 2016
(This article belongs to the Special Issue Coinage Metal (Copper, Silver, and Gold) Catalysis)
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Abstract

The catalytic properties of modified Au/TiO2 catalysts for low-temperature CO oxidation are affected by deactivation and reactivation after long-term storage and by redox treatments. The effect of these phenomena on the catalysts was studied by HRTEM, BET, SEM, FTIR CO, XPS and H2 TPR methods. The main cause for the deactivation and reactivation of catalytic properties is the variation in the electronic state of the supported gold, mainly, the proportion of singly charged ions Au+. The most active samples are those with the highest proportion of singly charged gold ions, while catalysts with a high content of trivalent gold ions are inactive at low-temperatures. Active states of gold, resistant to changes caused by the reaction process and storage conditions, can be stabilized by modification of the titanium oxide support with transition metals oxides. The catalyst modified with lanthanum oxide shows the highest stability and activity. View Full-Text
Keywords: gold catalysts; support modification; CO oxidation; effect of storage; catalyst deactivation; catalyst reactivation gold catalysts; support modification; CO oxidation; effect of storage; catalyst deactivation; catalyst reactivation
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Kolobova, E.; Kotolevich, Y.; Pakrieva, E.; Mamontov, G.; Farías, M.H.; Bogdanchikova, N.; Cortés Corberán, V.; Pestryakov, A. Causes of Activation and Deactivation of Modified Nanogold Catalysts during Prolonged Storage and Redox Treatments. Molecules 2016, 21, 486.

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