Influence of the crystalline structure of ZrO2 on the metallic properties of Pt in Pt/WO3–ZrO2 catalysts
Tóm tắt
The influence of the crystalline structure of ZrO2 on the metallic properties of Pt, when supported on WO3–ZrO2, was studied. Pt supported on tetragonal zirconia loses its metallic properties while when supported on monoclinic zirconia it presents good metallic activities. WO2,2- deposited on amorphous Zr(OH)4 before calcination generates an active material for n‐butane isomerization. The larger the fraction of the tetragonal phase of zirconia in this material, the higher the isomerization activity and the lower the metallic activity of Pt.
Tài liệu tham khảo
K. Arata, Adv. Catal. 37 (1990) 165.
G. Larsen, E. Lotero, S.N. Raghavan, R.D. Parra and C.A. Querini, Appl. Catal. A 139 (1996) 201.
J.C. Yori, M.A. D'Amato, G. Costa and J.M. Parera, J. Catal. 153 (1995) 218.
J.C. Yori, C.L. Pieck and J.M. Parera, Appl. Catal. A 181 (1999) 5.
J.C. Yori, C.R. Vera and J.M. Parera, Appl. Catal. A 163 (1997) 165.
P.D.L. Mercera, J.G. Van Ommen, E.B.M. Doesburg, A.J. Burggraaf and J.R.H. Ross, Appl. Catal. 57 (1990) 127.
J.R. Regabulto, T.H. Fleish and E.E. Wolf, J. Catal. 107 (1987) 114.
R.A. Comelli, C.R. Vera and J.M. Parera, J. Catal. 150 (1994) 96.