XPS study on the effects of treatments on Pt2+ and Co2+ exchanged into NaY zeolite

Zoltán Zsoldos, Gábor Vass, Gemnin Lu, L. Guczi

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

X-ray photoelectron spectroscopy was applied to investigate Pt/NaY, Co/NaY and Pt-Co/NaY zeolites prepared by ion exchange (IE) and impregnation (IM). Changes in the electronic states and surface distribution of sodium and silicon were followed in NaY and in Pt and Co containing NaY in the as prepared (AP), calcined (OX) and reduced (RE) states. Decoration of the zeolite surface by alumina detected, is attributed to the local processes during ion exchange. Introduction of Co2+ ions into the Pt-containing samples influences the electronic states of platinum both in calcined and reduced state. Pt° facilitates reduction of Co2+ ions and formation of bimetallic Pt-Co particles within the zeolite supercages could also be evidenced. The results support earlier TPR measurements indicating the presence of very small Pt-Co bimetallic particles for (IE) samples. On the other hand, in the impregnated NaY no sodium exchange occurs and the transition-metal species are located at the external surface of NaY zeolites.

Original languageEnglish
Pages (from-to)467-475
Number of pages9
JournalApplied Surface Science
Volume78
Issue number4
DOIs
Publication statusPublished - 1994

Fingerprint

Zeolites
Ion exchange
X ray photoelectron spectroscopy
Electronic states
Sodium
ions
zeolites
Ions
Impregnation
Transition metals
sodium
Aluminum Oxide
Platinum
Silicon
Alumina
electronics
platinum
aluminum oxides
transition metals
photoelectron spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Condensed Matter Physics

Cite this

XPS study on the effects of treatments on Pt2+ and Co2+ exchanged into NaY zeolite. / Zsoldos, Zoltán; Vass, Gábor; Lu, Gemnin; Guczi, L.

In: Applied Surface Science, Vol. 78, No. 4, 1994, p. 467-475.

Research output: Contribution to journalArticle

Zsoldos, Zoltán ; Vass, Gábor ; Lu, Gemnin ; Guczi, L. / XPS study on the effects of treatments on Pt2+ and Co2+ exchanged into NaY zeolite. In: Applied Surface Science. 1994 ; Vol. 78, No. 4. pp. 467-475.
@article{a492ca28bd3742b58e76e29b256298b9,
title = "XPS study on the effects of treatments on Pt2+ and Co2+ exchanged into NaY zeolite",
abstract = "X-ray photoelectron spectroscopy was applied to investigate Pt/NaY, Co/NaY and Pt-Co/NaY zeolites prepared by ion exchange (IE) and impregnation (IM). Changes in the electronic states and surface distribution of sodium and silicon were followed in NaY and in Pt and Co containing NaY in the as prepared (AP), calcined (OX) and reduced (RE) states. Decoration of the zeolite surface by alumina detected, is attributed to the local processes during ion exchange. Introduction of Co2+ ions into the Pt-containing samples influences the electronic states of platinum both in calcined and reduced state. Pt° facilitates reduction of Co2+ ions and formation of bimetallic Pt-Co particles within the zeolite supercages could also be evidenced. The results support earlier TPR measurements indicating the presence of very small Pt-Co bimetallic particles for (IE) samples. On the other hand, in the impregnated NaY no sodium exchange occurs and the transition-metal species are located at the external surface of NaY zeolites.",
author = "Zolt{\'a}n Zsoldos and G{\'a}bor Vass and Gemnin Lu and L. Guczi",
year = "1994",
doi = "10.1016/0169-4332(94)90070-1",
language = "English",
volume = "78",
pages = "467--475",
journal = "Applied Surface Science",
issn = "0169-4332",
publisher = "Elsevier",
number = "4",

}

TY - JOUR

T1 - XPS study on the effects of treatments on Pt2+ and Co2+ exchanged into NaY zeolite

AU - Zsoldos, Zoltán

AU - Vass, Gábor

AU - Lu, Gemnin

AU - Guczi, L.

PY - 1994

Y1 - 1994

N2 - X-ray photoelectron spectroscopy was applied to investigate Pt/NaY, Co/NaY and Pt-Co/NaY zeolites prepared by ion exchange (IE) and impregnation (IM). Changes in the electronic states and surface distribution of sodium and silicon were followed in NaY and in Pt and Co containing NaY in the as prepared (AP), calcined (OX) and reduced (RE) states. Decoration of the zeolite surface by alumina detected, is attributed to the local processes during ion exchange. Introduction of Co2+ ions into the Pt-containing samples influences the electronic states of platinum both in calcined and reduced state. Pt° facilitates reduction of Co2+ ions and formation of bimetallic Pt-Co particles within the zeolite supercages could also be evidenced. The results support earlier TPR measurements indicating the presence of very small Pt-Co bimetallic particles for (IE) samples. On the other hand, in the impregnated NaY no sodium exchange occurs and the transition-metal species are located at the external surface of NaY zeolites.

AB - X-ray photoelectron spectroscopy was applied to investigate Pt/NaY, Co/NaY and Pt-Co/NaY zeolites prepared by ion exchange (IE) and impregnation (IM). Changes in the electronic states and surface distribution of sodium and silicon were followed in NaY and in Pt and Co containing NaY in the as prepared (AP), calcined (OX) and reduced (RE) states. Decoration of the zeolite surface by alumina detected, is attributed to the local processes during ion exchange. Introduction of Co2+ ions into the Pt-containing samples influences the electronic states of platinum both in calcined and reduced state. Pt° facilitates reduction of Co2+ ions and formation of bimetallic Pt-Co particles within the zeolite supercages could also be evidenced. The results support earlier TPR measurements indicating the presence of very small Pt-Co bimetallic particles for (IE) samples. On the other hand, in the impregnated NaY no sodium exchange occurs and the transition-metal species are located at the external surface of NaY zeolites.

UR - http://www.scopus.com/inward/record.url?scp=0028485542&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0028485542&partnerID=8YFLogxK

U2 - 10.1016/0169-4332(94)90070-1

DO - 10.1016/0169-4332(94)90070-1

M3 - Article

VL - 78

SP - 467

EP - 475

JO - Applied Surface Science

JF - Applied Surface Science

SN - 0169-4332

IS - 4

ER -