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Titolo:
Role of mordenite acid properties in silver cluster stabilization
Autore:
Bogdanchikova, N; Petranovskii, V; Fuentes, S; Paukshtis, E; Sugi, Y; Licea-Claverie, A;
Indirizzi:
UNAM, Ctr Ciencias Mat Condensada, San Ysidro, CA 92143 USA UNAM San Ysidro CA USA 92143 ias Mat Condensada, San Ysidro, CA 92143 USA CICESE, Ensenada 22800, Baja California, Mexico CICESE Ensenada Baja California Mexico 22800 800, Baja California, Mexico Inst Catalysis, Novosibirsk 630090, Russia Inst Catalysis Novosibirsk Russia 630090 sis, Novosibirsk 630090, Russia Gifu Univ, Gifu 50511, Japan Gifu Univ Gifu Japan 50511Gifu Univ, Gifu 50511, Japan Inst Tecnol Tijuana, CGI, Tijuana 22000, BC, Mexico Inst Tecnol Tijuana Tijuana BC Mexico 22000 GI, Tijuana 22000, BC, Mexico
Titolo Testata:
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
fascicolo: 1-2, volume: 276, anno: 2000,
pagine: 236 - 242
SICI:
0921-5093(20000115)276:1-2<236:ROMAPI>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Keywords:
mordenite; acid properties; silver clusters;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Bogdanchikova, N UNAM, Ctr Ciencias Mat Condensada, POB 439036, San Ysidro, CA 92143 USA UNAM POB 439036 San Ysidro CA USA 92143 dro, CA 92143 USA
Citazione:
N. Bogdanchikova et al., "Role of mordenite acid properties in silver cluster stabilization", MAT SCI E A, 276(1-2), 2000, pp. 236-242

Abstract

In the present work, the role of SiO2/Al2O3 molar ratio in silver cluster stabilization inside mordenite pores was studied. It was found that SiO2/Al2O3 molar ratio regulates silver cluster stabilization by means of change of mordenite acid properties. The high concentration and high strength of Bronsted acid sites favor the stabilization of silver in the form of clustersinside the pores. In contrast, low concentration and low strength of Bronsted acid sites and high concentration of Lewis sites inside the channels can hinder stabilization of silver clusters. In this case, large particles onthe external surface of zeolite are preferably formed. It was revealed that silver cluster introduction in its turn influences acid properties of mordenites, changing the concentration and structure of acid sites. As a result of silver incorporation, four types of Lewis acid sites presented in H-mordenites disappear and a new type of Lewis acid site appears. For the majority of samples, it is accompanied by enhancement of concentration of Lewis sites so that all Al becomes 'IR visible'. (C) 2000 Elsevier Science S.A. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 04:46:19