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Titolo:
Preparation and characterization of titanium-containing MFI from highly siliceous ZSM-5: effect of precursors synthesized with different templates
Autore:
Zhang, FZ; Guo, XW; Wang, XS; Li, GY; Zhao, Q; Bao, XH; Han, XW; Lin, LW;
Indirizzi:
Dalian Univ Technol, Lab Comprehens Utilizat Carbonaceous Resources, Dalian 116012, Peoples R China Dalian Univ Technol Dalian Peoples R China 116012 16012, Peoples R China Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China Chinese Acad Sci Dalian Peoples R China 116023 n 116023, Peoples R China
Titolo Testata:
MATERIALS CHEMISTRY AND PHYSICS
fascicolo: 3, volume: 60, anno: 1999,
pagine: 215 - 220
SICI:
0254-0584(19990915)60:3<215:PACOTM>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
ZEOLITES; BETA;
Keywords:
Ti-ZSM-5 zeolite; secondary synthesis; organic template; epoxidation of propylene;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Zhang, FZ Dalian Univ Technol, Lab Comprehens Utilizat Carbonaceous Resources, Dalian 116012, Peoples R China Dalian Univ Technol Dalian Peoples R China 116012 ples R China
Citazione:
F.Z. Zhang et al., "Preparation and characterization of titanium-containing MFI from highly siliceous ZSM-5: effect of precursors synthesized with different templates", MATER CH PH, 60(3), 1999, pp. 215-220

Abstract

Titanium-containing MFI zeolites (Ti-ZSM-5) have been prepared by gas-solid reaction between highly siliceous ZSM-5 precursors synthesized with different organic molecules, and TiCL4 vapor at elevated temperature. XRD, FT-IR, UV-Vis, Si-29 and Al-27 solid NMR techniques are used to characterize precursors and Ti-ZSM-5 zeolites. Highly siliceous ZSM-5 synthesized with different templates possesses different amount of internal silanol groups clustered as silanol nests in framework. When the precursor is contacted with TiCl4 vapor at elevated temperature, titanium atoms are incorporated into thetetrahedral sites by the reaction between TiCl4 and silanol nests, not by the isomorphous substitution of titanium for framework aluminium or/and silicon. Highly siliceous ZSM-5 precursor synthesized with NEA, TEABr or HDA template possesses relatively large amount of internal silanol groups, and then obtains high concentrations of framework titanium after contacted with TiCl4 vapor, compared to those synthesized with TPAOH or TPABr template. Inaddition, Ti-ZSM-5 with precursors obtained by using NEA, TEABr or HDA template can occupy higher catalytic activity in the epoxidation of propylene with diluted hydrogen peroxide. (C) 1999 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 30/10/20 alle ore 07:11:32