Título Improved hydrothermal stability of niobia-supported Pd catalysts
Autores Pharn, Hien N. , Pagan-Torres, Yomaira J. , SERRANO RUIZ, JUAN CARLOS, Wang, Dong , Dumesic, James A. , Datye, Abhaya K.
Publicación externa Si
Medio Appl. Catal. A-Gen.
Alcance Article
Naturaleza Científica
Cuartil JCR 1
Cuartil SJR 1
Impacto JCR 3.90300
Impacto SJR 1.72700
Fecha de publicacion 30/04/2011
ISI 000290841300018
DOI 10.1016/j.apcata.2011.02.026
Abstract Aqueous-phase reactions at elevated temperatures can cause significant loss of surface area in oxide supports. Addition of a second component can help improve the hydrothermal stability of the support and retain a more open, porous structure. Here we show that small amounts of silica (5 wt%) help improve the activity and stability of Pd/niobia-silica catalysts used for pentanoic acid formation from gamma-valerolactone. At the end of the run, the Pd/Nb-Si oxide catalysts showed significantly higher activity than catalysts where the Pd was deposited on commercial niobia (HY-340). Loss of surface area occurred for all of the catalysts; however, surface area loss occurred to lesser extents for the Pd/Nb-Si oxide catalysts. In these samples, the regions that contained more silica retained their porous structure and maintained smaller Pd crystallite sizes after reaction while those areas with depleted silica content transformed into crystalline niobia along with significant metal particle growth. We conclude that addition of silica to niobia not only improves the stability of the support but also helps retain smaller crystallite sizes for the Pd phase, resulting in improved catalytic performance in the bi-functional aqueous-phase conversion of gamma-valerolactone into pentanoic acid. (C) 2011 Elsevier B.V. All rights reserved.
Palabras clave Niobia; gamma-valerolactone; Pentanoic acid; High surface area; Hydrothermal stability
Miembros de la Universidad Loyola

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