Evaluation of metal oxide phase assembling mode inside the nanotubular pores of mesostructured silica

L. Vradman; M. V. Landau; D. Kantorovich; Y. Koltypin; A. Gedanken

doi:10.1016/j.micromeso.2004.11.023

Evaluation of metal oxide phase assembling mode inside the nanotubular pores of mesostructured silica

L. Vradman, M. V. Landau, D. Kantorovich, Y. Koltypin, A. Gedanken

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

145 Scopus citations

Abstract

The assembling mode of transition metal oxides and metallic guest phases (GP) embedded in nanotubular pores of ordered mesostructured silicas (OMS) hosts was evaluated based on N₂ adsorption-desorption data. The corresponding isotherms were measured for sample sets of composite materials MoO₃/Al-MCM-41, WO₃/SBA-15, TiO₂/SBA-15, ZrO₂/SBA-15, NiO/SBA-15 and Ni°/SBA-15 with GP loadings in the range of 20-80 wt%. The materials were also characterized by XRD, HRTEM and local/total EDS. It was shown that a combination of composite surface area values normalized per gram of OMS with pore size distribution (PSD) derived from the adsorption or desorption branch of the isotherm distinguishes the ensemble of small nanoparticles with a size of less than an OMS mesopore diameter and single nanoparticles of a size comparable with OMS mesopore diameter. It also discerns amorphous layer at the surface of OMS pore walls from the ensemble of amorphous nanoparticles. At high GP loadings the PSD derived from the adsorption branch of the N₂-adsorption isotherm more reliably reflects the filling of OMS mesopores with crystalline or amorphous guest nanoparticles.

Original language	English
Pages (from-to)	307-318
Number of pages	12
Journal	Microporous and Mesoporous Materials
Volume	79
Issue number	1-3
DOIs	https://doi.org/10.1016/j.micromeso.2004.11.023
State	Published - 1 Apr 2005

Bibliographical note

Funding Information:
This study was supported by the Israel Science Foundation, Center of Excellence (Grant no. 8003). The authors gratefully acknowledge Mr. V. Ezersky and Dr. A.I. Erenburg for conducting the HRTEM and XRD characterizations, respectively.

Funding

This study was supported by the Israel Science Foundation, Center of Excellence (Grant no. 8003). The authors gratefully acknowledge Mr. V. Ezersky and Dr. A.I. Erenburg for conducting the HRTEM and XRD characterizations, respectively.

Funders	Funder number
Center of Excellence	8003
Israel Science Foundation

Keywords

Mesostructured silica
N-adsorption
Nanocrystals
Nickel
Titania
Zirconia

Access to Document

10.1016/j.micromeso.2004.11.023

Cite this

@article{c74e0258fc924a8c8fd02bc8cc44a3ab,

title = "Evaluation of metal oxide phase assembling mode inside the nanotubular pores of mesostructured silica",

abstract = "The assembling mode of transition metal oxides and metallic guest phases (GP) embedded in nanotubular pores of ordered mesostructured silicas (OMS) hosts was evaluated based on N2 adsorption-desorption data. The corresponding isotherms were measured for sample sets of composite materials MoO3/Al-MCM-41, WO3/SBA-15, TiO2/SBA-15, ZrO2/SBA-15, NiO/SBA-15 and Ni°/SBA-15 with GP loadings in the range of 20-80 wt%. The materials were also characterized by XRD, HRTEM and local/total EDS. It was shown that a combination of composite surface area values normalized per gram of OMS with pore size distribution (PSD) derived from the adsorption or desorption branch of the isotherm distinguishes the ensemble of small nanoparticles with a size of less than an OMS mesopore diameter and single nanoparticles of a size comparable with OMS mesopore diameter. It also discerns amorphous layer at the surface of OMS pore walls from the ensemble of amorphous nanoparticles. At high GP loadings the PSD derived from the adsorption branch of the N2-adsorption isotherm more reliably reflects the filling of OMS mesopores with crystalline or amorphous guest nanoparticles.",

keywords = "Mesostructured silica, N-adsorption, Nanocrystals, Nickel, Titania, Zirconia",

author = "L. Vradman and Landau, {M. V.} and D. Kantorovich and Y. Koltypin and A. Gedanken",

note = "Funding Information: This study was supported by the Israel Science Foundation, Center of Excellence (Grant no. 8003). The authors gratefully acknowledge Mr. V. Ezersky and Dr. A.I. Erenburg for conducting the HRTEM and XRD characterizations, respectively. ",

year = "2005",

month = apr,

day = "1",

doi = "10.1016/j.micromeso.2004.11.023",

language = "אנגלית",

volume = "79",

pages = "307--318",

journal = "Microporous and Mesoporous Materials",

issn = "1387-1811",

publisher = "Elsevier B.V.",

number = "1-3",

}

TY - JOUR

T1 - Evaluation of metal oxide phase assembling mode inside the nanotubular pores of mesostructured silica

AU - Vradman, L.

AU - Landau, M. V.

AU - Kantorovich, D.

AU - Koltypin, Y.

AU - Gedanken, A.

N1 - Funding Information: This study was supported by the Israel Science Foundation, Center of Excellence (Grant no. 8003). The authors gratefully acknowledge Mr. V. Ezersky and Dr. A.I. Erenburg for conducting the HRTEM and XRD characterizations, respectively.

PY - 2005/4/1

Y1 - 2005/4/1

N2 - The assembling mode of transition metal oxides and metallic guest phases (GP) embedded in nanotubular pores of ordered mesostructured silicas (OMS) hosts was evaluated based on N2 adsorption-desorption data. The corresponding isotherms were measured for sample sets of composite materials MoO3/Al-MCM-41, WO3/SBA-15, TiO2/SBA-15, ZrO2/SBA-15, NiO/SBA-15 and Ni°/SBA-15 with GP loadings in the range of 20-80 wt%. The materials were also characterized by XRD, HRTEM and local/total EDS. It was shown that a combination of composite surface area values normalized per gram of OMS with pore size distribution (PSD) derived from the adsorption or desorption branch of the isotherm distinguishes the ensemble of small nanoparticles with a size of less than an OMS mesopore diameter and single nanoparticles of a size comparable with OMS mesopore diameter. It also discerns amorphous layer at the surface of OMS pore walls from the ensemble of amorphous nanoparticles. At high GP loadings the PSD derived from the adsorption branch of the N2-adsorption isotherm more reliably reflects the filling of OMS mesopores with crystalline or amorphous guest nanoparticles.

AB - The assembling mode of transition metal oxides and metallic guest phases (GP) embedded in nanotubular pores of ordered mesostructured silicas (OMS) hosts was evaluated based on N2 adsorption-desorption data. The corresponding isotherms were measured for sample sets of composite materials MoO3/Al-MCM-41, WO3/SBA-15, TiO2/SBA-15, ZrO2/SBA-15, NiO/SBA-15 and Ni°/SBA-15 with GP loadings in the range of 20-80 wt%. The materials were also characterized by XRD, HRTEM and local/total EDS. It was shown that a combination of composite surface area values normalized per gram of OMS with pore size distribution (PSD) derived from the adsorption or desorption branch of the isotherm distinguishes the ensemble of small nanoparticles with a size of less than an OMS mesopore diameter and single nanoparticles of a size comparable with OMS mesopore diameter. It also discerns amorphous layer at the surface of OMS pore walls from the ensemble of amorphous nanoparticles. At high GP loadings the PSD derived from the adsorption branch of the N2-adsorption isotherm more reliably reflects the filling of OMS mesopores with crystalline or amorphous guest nanoparticles.

KW - Mesostructured silica

KW - N-adsorption

KW - Nanocrystals

KW - Nickel

KW - Titania

KW - Zirconia

UR - http://www.scopus.com/inward/record.url?scp=14744292786&partnerID=8YFLogxK

U2 - 10.1016/j.micromeso.2004.11.023

DO - 10.1016/j.micromeso.2004.11.023

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:14744292786

SN - 1387-1811

VL - 79

SP - 307

EP - 318

JO - Microporous and Mesoporous Materials

JF - Microporous and Mesoporous Materials

IS - 1-3

ER -

Evaluation of metal oxide phase assembling mode inside the nanotubular pores of mesostructured silica

Abstract

Bibliographical note

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this