TY - JOUR
T1 - Preparation and characterization of silica-supported Ni/Pt catalysts
AU - Raab, Christian
AU - Lercher, Johannes A.
AU - Goodwin, James G.
AU - Shyu, Joseph Z.
N1 - Funding Information:
This work was supported by the Fonds zur For-derung der Wissenschaftlichen Forschung under project P6912 CHE and by the U.S. Department of Energy and Office of Basic Energy Science. Helpful discussions with G. Hilscher and P. Mohn are gratefully acknowledged.
PY - 1990/4
Y1 - 1990/4
N2 - The formation of a series of Ni/Pt catalysts was investigated by means of temperature-programmed reduction (TPR) of the chloride precursor, hydrogen chemisorption, X-ray diffraction, scanning electron microscopy, XPS, and magnetic measurements. An alloy between Pt and Ni was formed. The minority constituent of the series of bimetallic catalysts was always found to be quantitatively alloyed or in close contact with the more abundant metal. For several samples, the stoichiometric NiPt compound was observed. With Ni-rich samples a nonstoichiometric alloy (rich in Ni) was concluded to exist. At all concentration levels the presence of Pt facilitated the reduction of Ni2+ significantly. Temperature-programmed reduction of the Ni/Pt catalyst with 50 mol% and higher concentrations of Pt did not differ from that of pure Pt. Based on XPS and magnetic measurements it is concluded that a constant fraction (approximately 10-15%) of Ni was highly dispersed and interacted strongly with the support.
AB - The formation of a series of Ni/Pt catalysts was investigated by means of temperature-programmed reduction (TPR) of the chloride precursor, hydrogen chemisorption, X-ray diffraction, scanning electron microscopy, XPS, and magnetic measurements. An alloy between Pt and Ni was formed. The minority constituent of the series of bimetallic catalysts was always found to be quantitatively alloyed or in close contact with the more abundant metal. For several samples, the stoichiometric NiPt compound was observed. With Ni-rich samples a nonstoichiometric alloy (rich in Ni) was concluded to exist. At all concentration levels the presence of Pt facilitated the reduction of Ni2+ significantly. Temperature-programmed reduction of the Ni/Pt catalyst with 50 mol% and higher concentrations of Pt did not differ from that of pure Pt. Based on XPS and magnetic measurements it is concluded that a constant fraction (approximately 10-15%) of Ni was highly dispersed and interacted strongly with the support.
UR - http://www.scopus.com/inward/record.url?scp=0039590160&partnerID=8YFLogxK
U2 - 10.1016/0021-9517(90)90294-T
DO - 10.1016/0021-9517(90)90294-T
M3 - Article
AN - SCOPUS:0039590160
SN - 0021-9517
VL - 122
SP - 406
EP - 414
JO - Journal of Catalysis
JF - Journal of Catalysis
IS - 2
ER -