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Titolo:
ACIDITY OF A MICROPOROUS AMORPHOUS ALUMINA MEASURED BY INTERMITTENT TEMPERATURE-PROGRAMMED DESORPTION OF AMMONIA
Autore:
JOLY JP; KHALFALLAH M; BIANCHI D; PAJONK GM;
Indirizzi:
UNIV LYON 1,INST SCI MAT,MAT & PROC CATALYT LAB,43 BLVD 11 NOVEMBRE 1918 F-69622 VILLEURBANNE FRANCE
Titolo Testata:
Applied catalysis. A, General
fascicolo: 1, volume: 98, anno: 1993,
pagine: 61 - 70
SICI:
0926-860X(1993)98:1<61:AOAMAA>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
ZEOLITES; SURFACES;
Keywords:
ACIDITY; AMMONIA; AMORPHOUS ALUMINA; HEAT OF ADSORPTION; TEMPERATURE-PROGRAMMED DESORPTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
J.P. Joly et al., "ACIDITY OF A MICROPOROUS AMORPHOUS ALUMINA MEASURED BY INTERMITTENT TEMPERATURE-PROGRAMMED DESORPTION OF AMMONIA", Applied catalysis. A, General, 98(1), 1993, pp. 61-70

Abstract

Mathematical models used to achieve the deconvolution of temperature-programmed desorption (TPD) spectra from heterogeneous surfaces generally rely on assumptions about the pre-exponential factor or on the variation of the activation energy of desorption with coverage. In contrast, intermittent temperature-programmed desorption (ITPD) is a method that allows the apparent desorption activation energies E(d) to be determined without making such restrictive assumptions. ITPD has been applied to ammonia, used as a basic probe molecule desorbed from an amorphous, microporous alumina sample. Five different chemisorbed states have been evidenced. These five states of adsorbed ammonia are characterized by apparent E(d) values ranging from 109 to 234 kJ/mol. These results are compared with those of differential microcalorimetry found inthe literature and the consequences of the discovery of discrete ammonia adsorbed states are discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 06:49:46