On the reasons for deactivation of titanate nanotubes with metals catalysts in the acetalization of glycerol with acetone

On the reasons for deactivation of titanate nanotubes with metals catalysts in the acetalization of glycerol with acetone

Author Gomes, Igor S. Google Scholar
de Carvalho, Davi C. Google Scholar
Oliveira, Alcineia C. Google Scholar
Rodriguez-Castellon, Enrique Google Scholar
Tehuacanero-Cuapa, Samuel Google Scholar
Freire, Paulo T. C. Google Scholar
Filho, Josue M. Google Scholar
Saraiva, Gilberto D. Google Scholar
de Sousa, Francisco F. Google Scholar
Lang, Rossano Autor UNIFESP Google Scholar
Abstract Pt-containing titanate nanotubes (PTNT) catalyst had PtOx and chlorined-Pt species dispersed on the alkali trititanate nanotube phase (TNT). This solid was morphologically and structurally stable during glycerol acetalization of glycerol with acetone. In contrast, a significant transformation of Ni2+ and Co3+/Co2+ surface species dispersed on TNT provoked morphological, textural and surface changes affecting the catalytic performance of these samples, as observed with the help of HRTEM, XPS, Raman and textural properties measurements. Leaching of Co and Ni species was identified as the main mechanism for the deactivation respectively on Co-containing titanate nanotubes (CTNT) and Ni-containing titanate nanotube (NTNT) catalysts. On the contrary, PTNT performed very well giving rise to 28% of conversion and 11% selectivity to solketal over three reaction cycles of 24 h. This was thanked to the suitable tuning of pore-structure and proper surface acidity of PTNT, resulting in a stable solid for the reaction.
Keywords Titanate nanotubes
Modification
Deactivation
Raman
Acetalization
Glycerol
xmlui.dri2xhtml.METS-1.0.item-coverage Lausanne
Language English
Sponsor CAPES/FUNCAP [23038.008860/2013-92, 23038.007964/2012-07]
CNPq
MINECO [CTQ2015-68951-C3-3R]
FEDER
Grant number CAPES/FUNCAP: 23038.008860/2013-92, 23038.007964/2012-07]
MINECO: CTQ2015-68951-C3-3R
Date 2018
Published in Chemical Engineering Journal. Lausanne, v. 334, p. 1927-1942, 2018.
ISSN 1385-8947 (Sherpa/Romeo, impact factor)
Publisher Elsevier Science Sa
Extent 1927-1942
Origin http://dx.doi.org/10.1016/j.cej.2017.11.112
Access rights Closed access
Type Article
Web of Science ID WOS:000418533400192
URI https://repositorio.unifesp.br/handle/11600/54127

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