Preparation of Au/TiO2 by a facile method at room temperature for the CO preferential oxidation reaction

Author(s)

Leal, Georgia Barbalho ^[1] ; Ciotti, Ligia ^[1] ; Watacabe, Beatriz Naomy ^[1] ; Loureiro da Silva, Daniela C. ^[1] ; Antoniassi, Rodolfo M. ^{[1, 2]} ; Silva, Julio Cesar M. ^[1] ; Linardi, Marcelo ^[1] ; Giudici, Reinaldo ^[3] ; Vaz, Jorge Moreira ^[1] ; Spinace, V, Estevam

Affiliation

^[1] V, CNEN SP, IPEN, Av Prof Lineu Prestes 2242, Cidade Univ, BR-05508900 Sao Paulo, SP - Brazil

^[2] Univ Sao Paulo, Inst Quim, Av Prof Lineu Prestes 748, Cidade Univ, BR-05508000 Sao Paulo, SP - Brazil

^[3] Univ Sao Paulo, Dept Engn Quim, Escola Politecn, Av Prof Luciano Gualberto 380, Cidade Univ, BR-05508010 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: Catalysis Communications; v. 116, p. 38-42, NOV 2018.
• Web of Science Citations: 3

Abstract

A simple strategy was used to prepare Au/TiO2 catalyst at room temperature. Au nanoparticles were initially prepared in solution using HAuCl4 center dot 3H(2)O as Au precursor, sodium citrate as stabilizing agent and sodium borohydride as reducing agent. The preformed Au nanoparticles were further supported on TiO2 and the resulting solid material was characterized by Energy-dispersive X-ray spectroscopy, X-ray diffraction and Transmission Electron Microscopy and tested for the preferential oxidation of carbon monoxide in hydrogen-rich stream (CO-PROX reaction). The obtained Au/TiO2 catalyst consisted of Au nanoparticles with an average size of similar to 4 nm and showed excellent catalytic performance in the 20.50 degrees C low-temperature range. In particular, at 40 degrees C a CO conversion of 99.5% and CO2 selectivity of 45% were obtained using an O-2/CO ratio of 2 (1 vol% CO, lambda = 4) and 97 vol% H-2 in the feed gas stream (GHSV = 15,000 mL g(cat)(-1) h(-1)). (AU)

• FAPESP's process: 17/15469-5 - Preparation of nanocatalysts with controlled morphology for applications in hydrogen purification and oxidation of contaminated hydrogen for electric energy generation
• Grantee: Rodolfo Molina Antoniassi
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 14/50279-4 - Brasil Research Centre for Gas Innovation
• Grantee: Julio Romano Meneghini
• Support Opportunities: Research Grants - Research Centers in Engineering Program
• FAPESP's process: 16/21227-1 - Project 20: metallic nanoparticles supported as catalysts for the CO preferential oxidation reaction
• Grantee: Geórgia Barbalho Leal
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 14/09087-4 - Studies on the use of bioethanol in proton exchange membrane and solid oxide fuel cells
• Grantee: Marcelo Linardi
• Support Opportunities: Research Projects - Thematic Grants