DIFFUSE-REFLECTANCE IR STUDY OF NOBLE-METALS SUPPORTED ON BASIC CARRIERS - PART I - PT SUPPORTED ON AL-MG HYDROTALCITE

Authors
KAZANSKY VB BOROVKOV VY SERYKH AI FIGUERAS F
Citation
Vb. Kazansky et al., DIFFUSE-REFLECTANCE IR STUDY OF NOBLE-METALS SUPPORTED ON BASIC CARRIERS - PART I - PT SUPPORTED ON AL-MG HYDROTALCITE, Catalysis letters, 49(1-2), 1997, pp. 35-41
Citations number
24
Journal title
Catalysis letters → ACNP
ISSN journal
1011372X
Volume
49
Issue
1-2
Year of publication
1997
Pages
35 - 41
Database
ISI
SICI code
1011-372X(1997)49:1-2<35:DISONS>2.0.ZU;2-2
Abstract
The state of metallic Pt supported on alumina-magnesia hydrotalcite wa s investigated using diffuse reflectance FT-IR spectra of adsorbed CO and terminal Pt hydrides formed upon hydrogen dissociative chemisorpti on on metal at room temperature. On hydrotalcite surface metallic Pt e xists in three different forms, such as neutral and negatively charged metallic particles as well as slightly negatively charged clusters en capsulated between layers of support: Negative charging on Pt particle s results in decrease of singleton frequency of linearly adsorbed CO b y 70 cm(-1) and frequency of Pt-H bond vibration by 50-100 cm(-1). It was also established that negatively charged Pt is less sulfur resista nt than neutral Pt particles.