INVESTIGADORES
MAZZIERI Vanina Alejandra
artículos
Título:
Preparations of trimetallic Pt-Re-Ge/Al2O3 and Pt-Ir-Ge/Al2O3 naphta reforming catalysts by surface redox reaction
Autor/es:
. VIVIANA M. BENITEZ CARLOS PIECK.; MARIEME BOUTZELOIT; VANINA A. MAZZIERI; CATHERINE ESPECEL; FLORENCE EPRON; CARLOS VERA; PATRICE MARECOT; PATRICE MARECOT
Revista:
APPLIED CATALYSIS A-GENERAL
Editorial:
Elsevier
Referencias:
Año: 2007 vol. 319 p. 210 - 217
ISSN:
0926-860X
Resumen:
Preparation of trimetallic PtReGe/Al2O3 and PtIrGe/Al2O3 naphtha reforming catalysts by means of a surface redox reaction (namely the
catalytic reduction method), was studied by varying the concentration of Ge. The catalytic reduction method was chosen in order to favor the
interaction of Ge with the active PtRe and PtIr phases.
The results shows that the deposition of Ge on the bimetallic catalysts does not seemingly depend on the nature of themetal phase (PtIr or PtRe).
The test reactions indicated that Ge addition modified the properties of both the metal and acid functions of the bimetallic catalysts. The
modification of the acidity is due to the deposition of part of Ge on the support.
The n-C7 reforming results show that PtReGe/Al2O3 and PtIrGe/Al2O3 catalysts with low Ge contents (0.3%) have similar catalytic
performances (toluene yield, C1C4 formation, coke deposit) as the presulfided bimetallic samples. This effect is attributed to an efficient
passivation of hydrogenolytic activity at low Ge contents. At higher Ge contents a drastic decrease of the toluene yield is observed due to a strong
poisoning of the metal phase and the formation of isolated Ge species.2O3 and PtIrGe/Al2O3 naphtha reforming catalysts by means of a surface redox reaction (namely the
catalytic reduction method), was studied by varying the concentration of Ge. The catalytic reduction method was chosen in order to favor the
interaction of Ge with the active PtRe and PtIr phases.
The results shows that the deposition of Ge on the bimetallic catalysts does not seemingly depend on the nature of themetal phase (PtIr or PtRe).
The test reactions indicated that Ge addition modified the properties of both the metal and acid functions of the bimetallic catalysts. The
modification of the acidity is due to the deposition of part of Ge on the support.
The n-C7 reforming results show that PtReGe/Al2O3 and PtIrGe/Al2O3 catalysts with low Ge contents (0.3%) have similar catalytic
performances (toluene yield, C1C4 formation, coke deposit) as the presulfided bimetallic samples. This effect is attributed to an efficient
passivation of hydrogenolytic activity at low Ge contents. At higher Ge contents a drastic decrease of the toluene yield is observed due to a strong
poisoning of the metal phase and the formation of isolated Ge species.n-C7 reforming results show that PtReGe/Al2O3 and PtIrGe/Al2O3 catalysts with low Ge contents (0.3%) have similar catalytic
performances (toluene yield, C1C4 formation, coke deposit) as the presulfided bimetallic samples. This effect is attributed to an efficient
passivation of hydrogenolytic activity at low Ge contents. At higher Ge contents a drastic decrease of the toluene yield is observed due to a strong
poisoning of the metal phase and the formation of isolated Ge species.1C4 formation, coke deposit) as the presulfided bimetallic samples. This effect is attributed to an efficient
passivation of hydrogenolytic activity at low Ge contents. At higher Ge contents a drastic decrease of the toluene yield is observed due to a strong
poisoning of the metal phase and the formation of isolated Ge species.