Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Morphological, Structural, and Chemical Properties of Thermally Stable Ni-Nb2O5 for Catalytic Applications

Full text
Author(s):
Leal, Glauco F. [1, 2] ; Barrett, Dean H. [1, 3] ; Carrer, Heloise [1] ; Figueroa, Santiago J. A. [1] ; Teixeira-Neto, Erico [4] ; Curvelo, Antonio Aprigio S. [2] ; Rodella, Cristiane B. [1]
Total Authors: 7
Affiliation:
[1] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil
[2] Univ Sao Paulo, Inst Chem Sao Carlos, Dept Phys Chem, Av Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP - Brazil
[3] Univ Witwatersrand, Sch Chem, Jorissen St, Johannesburg - South Africa
[4] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Nanotechnol Natl Lab LNNano, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Journal of Physical Chemistry C; v. 123, n. 5, p. 3130-3143, FEB 7 2019.
Web of Science Citations: 1
Abstract

Structural stability is a pivotal property required for Nb2O5 to be applied as a solid-acid catalyst in heterogeneous catalytic reactions. When combined with Ni, Nb2O5 produces cheap and active hydrogenation catalysts. Ni-Nb2O5 operates as a bifunctional catalyst and is being widely explored for various catalytic applications without, however, exploring its structural stability and its effects on catalytic activity and durability. Herein we studied two forms of niobia, one with nonuniform morphology and another comprising a nanorod morphology. Various selected Ni loadings were dispersed on the two supports via a deposition-precipitation method. Physical and chemical characterization revealed that morphological control in combination with a highly efficient Ni deposition method is key in producing a structurally stable Ni-Nb2O5 catalyst. High surface area and porosity as exhibited by the Nb2O5 nanorods, in the pseudohexagonal phase, combined with small, well-dispersed Ni particles, provide a structurally stable material up to 500 degrees C, with high acidity (Lewis and Bronsted acid sites). Moreover, the local and long-range order, characterized in situ XANES and XRD), determined the temperature limits for the optimization of metallic Ni particles in relation to the Nb2O5 structure. (AU)

FAPESP's process: 15/22711-1 - Synthesis and characterization of Ni and Co supported on Nb2O5 catalysts to cellulose conversion
Grantee:Heloise Carrer
Support Opportunities: Scholarships in Brazil - Scientific Initiation