Doping effects of Ni-MgO on the structure and performance of carbon nanotube-supported Pt catalysts for preferential oxidation of CO in a H2 stream

Publication year: 2011
Source: Applied Catalysis A: General, In Press, Accepted Manuscript, Available online 13 June 2011

Hongwei, Yang , Chao, Wang , Bodong, Li , Haiqiang, Lin , Ken-ichi, Tanaka , …

The preferential oxidation of CO (CO-PROX) in a H2-rich stream is performed on a series of supported Pt catalysts doped with Ni-MgO. The characterizations of the catalysts by means of in-situ X-ray diffraction, high resolution transmission electron microscopy, and scanning transmission electron microscopy-energy dispersive spectroscopy reveal that the nanocomposites of Pt-Ni alloys that intimately adjoined Ni-MgO solid solution are present on the surfaces of carbon nanotube (CNT). However, the Pt-Ni alloying is hardly detected when the same compositions are supported on other carriers like active carbon, graphite, TiO2, SiO2 and Al2O3 followed by identical treatment. The CNT-supported Pt0.3Ni1.0Mg2.4 (Pt0.3Ni1.0Mg2.5/CNT, the…

 Highlights: ► Pt-Ni alloy adjoined by Ni-MgO solid solution is formed on CNT surface. ► Pt-Ni-Mg/CNT catalyst can completely remove CO in a H2 stream at 333−453K. ► CO-PROX reaction can be performed in a H2 stream containing CO2 and H2O vapor. ► Particle size of Pt-Ni alloy influences the CO-PROX performance. ► Deactivated catalyst is recoverable by heat treatment and reduction at higher temperature.