TY  - JOUR
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-84868219979&doi=10.4028%2fwww.scientific.net%2fAMR.545.129&partnerID=40&md5=651ffcea599edac66529d3fde38badcc
A1  - Ali, S.
A1  - Mohd Zabidi, N.A.
A1  - Subbarao, D.
JF  - Advanced Materials Research
VL  - 545
Y1  - 2012///
N2  - The present work deals with the synthesis of cobalt monometallic and bimetallic Co/Fe nanocatalysts supported on alumina. The nanocatalysts were prepared by a wet impregnation method. The samples were characterized in terms of reducibility, dispersion, metal particle size, textural characteristics and crystallinity. These characteristics were revealed using hydrogen temperature-programmed reduction (TPR), CO-chemisorption, transmission electron microscopy (TEM), X-ray diffraction (XRD) and nitrogen adsorption analysis. H 2-TPR analysis of Co/Al 2O 3 indicated three temperature regions at 507 °C (low temperature), 650 °C (medium temperature) and 731 °C (high temperature) while characteristic peaks of Fe/ Al 2O 3 appeared at 454 °C, 635 °C and 716 °C, respectively. Bimetallic nanocatalysts exhibited different physicochemical properties than those of the monometallic nanocatalysts. The incorporation of iron into cobalt nanocatalysts up to 50 of the total metal loaded enhanced the reducibility, increased the CO and H 2 chemisorbed and degree of reduction (DR T) while surface area decreased, further increase in the iron content resulted in a decrease in the crystallinity, increase in the average metal particle size and shift in the reduction towards higher temperatures. © (2012) Trans Tech Publications, Switzerland.
KW  - Alumina-supported; Bimetallic nanoparticles; Characteristic peaks; Co-chemisorption; Crystallinities; Degree of reduction; High temperature; Iron content; Low temperatures; Medium temperature; Metal particle; Nanocatalysts; Nitrogen adsorption; Physicochemical property; Surface area; Temperature-programmed reduction; Textural characteristic; Three temperature; Transmission electron microscopy tem; Wet impregnation method
KW  -  Alumina; Chemisorption; Dispersions; Gas adsorption; Hydrogen; Iron; Nanotechnology; Particle size; Transmission electron microscopy; X ray diffraction
KW  -  Cobalt
ID  - scholars2689
CY  - Kuala Lumpur
EP  - 136
SN  - 10226680
N1  - cited By 1; Conference of 2nd International Conference on the Advancement of Materials and Nanotechnology, ICAMN II 2010 ; Conference Date: 29 November 2010 Through 1 December 2010; Conference Code:92649
TI  - Synthesis and characterization of γ-alumina-supported cobalt and iron nanocatalysts
SP  - 129
AV  - none
ER  -