Nanocomposite catalytic materials: synthesis, characterisation and reactivity of Pt/Cs-BEA zeolites

CHIARA BISIO; C. CALDEIRA; V. DAL SANTO; G. MARTRA; P. MASSIANI; R. PSARO; M. F. RIBEIRO; J. M. SILVA; L. STIEVANO

doi:10.1016/S0020-1693(03)00035-5

Nanocomposite catalytic materials: synthesis, characterisation and reactivity of Pt/Cs-BEA zeolites

CHIARA BISIO, C. CALDEIRA, V. DAL SANTO, G. MARTRA, P. MASSIANI, R. PSARO, M. F. RIBEIRO, J. M. SILVA, L. STIEVANO

Dipartimento di Scienze e Innovazione Tecnologica

Risultato della ricerca: Contributo su rivista › Articolo in rivista › peer review

Abstract

A parent acidic H-BEA sample characterised by crystallites with very small sizes and high external surface area has been used to prepare a series of Pt/Cs-BEA catalysts. The exchange three times of the highly defective H-BEA in a 0.5 M CsCl solution allowed to exchange only about half of the protons, as evaluated from both chemical analysis and FTIR spectroscopy in the presence of adsorbed NH₃. The further exchange by Pt(NH₃)₄²⁺ followed by impregnation with CsOH, calcination and finally reduction, led to a series of Pt/Cs-BEA samples with progressive increase of the caesium loading and concomitant change of the reducibility of the calcined Pt species and decrease of the size of the reduced Pt particles. The analysis of the FTIR data in the ν_OH and δ_NH ranges indicates a progressive removal of the protons. Finally, the selectivities to cracking, isomerisation, and aromatisation during conversion of n-hexane are in line with the variations of acido-basicity and Pt particle sizes in the samples.

Lingua originale	Inglese
pagine (da-a)	227-238
Numero di pagine	12
Rivista	Inorganica Chimica Acta
Volume	349
DOI	https://doi.org/10.1016/S0020-1693(03)00035-5
Stato di pubblicazione	Pubblicato - 2003

Accesso al documento

10.1016/S0020-1693(03)00035-5

http://hdl.handle.net/11579/17944

Altri file e collegamenti

handle

Cita questo

@article{ae4da0b84725426286e8bc7159b187da,

title = "Nanocomposite catalytic materials: synthesis, characterisation and reactivity of Pt/Cs-BEA zeolites",

abstract = "A parent acidic H-BEA sample characterised by crystallites with very small sizes and high external surface area has been used to prepare a series of Pt/Cs-BEA catalysts. The exchange three times of the highly defective H-BEA in a 0.5 M CsCl solution allowed to exchange only about half of the protons, as evaluated from both chemical analysis and FTIR spectroscopy in the presence of adsorbed NH3. The further exchange by Pt(NH3)42+ followed by impregnation with CsOH, calcination and finally reduction, led to a series of Pt/Cs-BEA samples with progressive increase of the caesium loading and concomitant change of the reducibility of the calcined Pt species and decrease of the size of the reduced Pt particles. The analysis of the FTIR data in the νOH and δNH ranges indicates a progressive removal of the protons. Finally, the selectivities to cracking, isomerisation, and aromatisation during conversion of n-hexane are in line with the variations of acido-basicity and Pt particle sizes in the samples.",

author = "CHIARA BISIO and C. CALDEIRA and SANTO, \{V. DAL\} and G. MARTRA and P. MASSIANI and R. PSARO and RIBEIRO, \{M. F.\} and SILVA, \{J. M.\} and L. STIEVANO",

note = "Funding Information: The CERC3 trilateral research program (CNRS, ICCTI and CNR) is gratefully acknowledged for financial support. The authors thank P. Beaunier of the electron microscopy service (UFR Chimie-Universit{\'e} Paris VI) for the microscopic analysis of the samples. ",

year = "2003",

doi = "10.1016/S0020-1693(03)00035-5",

language = "English",

volume = "349",

pages = "227--238",

journal = "Inorganica Chimica Acta",

issn = "0020-1693",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Nanocomposite catalytic materials: synthesis, characterisation and reactivity of Pt/Cs-BEA zeolites

AU - BISIO, CHIARA

AU - CALDEIRA, C.

AU - SANTO, V. DAL

AU - MARTRA, G.

AU - MASSIANI, P.

AU - PSARO, R.

AU - RIBEIRO, M. F.

AU - SILVA, J. M.

AU - STIEVANO, L.

N1 - Funding Information: The CERC3 trilateral research program (CNRS, ICCTI and CNR) is gratefully acknowledged for financial support. The authors thank P. Beaunier of the electron microscopy service (UFR Chimie-Université Paris VI) for the microscopic analysis of the samples.

PY - 2003

Y1 - 2003

N2 - A parent acidic H-BEA sample characterised by crystallites with very small sizes and high external surface area has been used to prepare a series of Pt/Cs-BEA catalysts. The exchange three times of the highly defective H-BEA in a 0.5 M CsCl solution allowed to exchange only about half of the protons, as evaluated from both chemical analysis and FTIR spectroscopy in the presence of adsorbed NH3. The further exchange by Pt(NH3)42+ followed by impregnation with CsOH, calcination and finally reduction, led to a series of Pt/Cs-BEA samples with progressive increase of the caesium loading and concomitant change of the reducibility of the calcined Pt species and decrease of the size of the reduced Pt particles. The analysis of the FTIR data in the νOH and δNH ranges indicates a progressive removal of the protons. Finally, the selectivities to cracking, isomerisation, and aromatisation during conversion of n-hexane are in line with the variations of acido-basicity and Pt particle sizes in the samples.

AB - A parent acidic H-BEA sample characterised by crystallites with very small sizes and high external surface area has been used to prepare a series of Pt/Cs-BEA catalysts. The exchange three times of the highly defective H-BEA in a 0.5 M CsCl solution allowed to exchange only about half of the protons, as evaluated from both chemical analysis and FTIR spectroscopy in the presence of adsorbed NH3. The further exchange by Pt(NH3)42+ followed by impregnation with CsOH, calcination and finally reduction, led to a series of Pt/Cs-BEA samples with progressive increase of the caesium loading and concomitant change of the reducibility of the calcined Pt species and decrease of the size of the reduced Pt particles. The analysis of the FTIR data in the νOH and δNH ranges indicates a progressive removal of the protons. Finally, the selectivities to cracking, isomerisation, and aromatisation during conversion of n-hexane are in line with the variations of acido-basicity and Pt particle sizes in the samples.

UR - https://iris.uniupo.it/handle/11579/17944

U2 - 10.1016/S0020-1693(03)00035-5

DO - 10.1016/S0020-1693(03)00035-5

M3 - Article

SN - 0020-1693

VL - 349

SP - 227

EP - 238

JO - Inorganica Chimica Acta

JF - Inorganica Chimica Acta

ER -

Nanocomposite catalytic materials: synthesis, characterisation and reactivity of Pt/Cs-BEA zeolites

Abstract

Accesso al documento

Altri file e collegamenti

Fingerprint

Cita questo