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Catalysts 2016, 6(7), 99; doi:10.3390/catal6070099

Gold Catalysts on Y-Doped Ceria Supports for Complete Benzene Oxidation

1
Institute of Catalysis, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Block 11, Sofia 1113, Bulgaria
2
Istituto per lo Studio di Materiali Nanostrutturati (ISMN)-CNR, Palermo I-90146, Italy
3
Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw 01-224, Poland
4
Institute of Physical Chemistry, Romanian Academy, Bucharest 77208, Romania
*
Authors to whom correspondence should be addressed.
Academic Editor: Salvatore Scirè
Received: 14 May 2016 / Revised: 28 June 2016 / Accepted: 1 July 2016 / Published: 8 July 2016
(This article belongs to the Collection Gold Catalysts)
View Full-Text   |   Download PDF [2911 KB, uploaded 8 July 2016]   |  

Abstract

Gold (3 wt. %) catalysts on Y-doped (1, 2.5, 5 and 7.5 wt. % Y2O3) ceria supports prepared by coprecipitation (CP) or impregnation (IM) were studied in complete benzene oxidation (CBO). A low-extent Y modification was chosen to avoid ordering of oxygen vacancies. The samples were characterized by XRD, TGA, XPS and TPR techniques. A positive role of air pretreatment at 350 °C as compared to 200 °C was established for all Y-containing catalysts and it was explained by cleaning the active sites from carbonates. The oxygen supply cannot be considered as a limiting step for benzene oxidation except for the high 7.5%-doped samples, as suggested by TGA and TPR data. On the basis of XPS results of fresh and used in CBO catalysts, the presence of cationic gold species does not seem important for high CBO activity. The gold catalyst on an IM support with 1% Y-doping exhibited the best performance. A 100% benzene conversion was achieved only over this catalyst and Au/ceria, while it was not reached even at 300 °C over all other studied catalysts. Gold and ceria particle agglomeration or coke formation should be excluded as a possible reason, and the most probable explanation could be associated with the importance of the benzene activation stage. View Full-Text
Keywords: gold catalysts; Y-doped ceria; preparation method; pretreatment conditions; complete benzene oxidation gold catalysts; Y-doped ceria; preparation method; pretreatment conditions; complete benzene oxidation
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MDPI and ACS Style

Ilieva, L.; Petrova, P.; Liotta, L.F.; Sobczak, J.W.; Lisowski, W.; Kaszkur, Z.; Munteanu, G.; Tabakova, T. Gold Catalysts on Y-Doped Ceria Supports for Complete Benzene Oxidation. Catalysts 2016, 6, 99.

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