Synthesis and physicochemical properties of Zr-MCM-41 mesoporous molecular sieves and Pt/H3PW12O40/Zr-MCM-41 catalysts

L. F. Chen; J. A. Wang; L. E. Noreña; J. Aguilar; J. Navarrete; P. Salas; J. A. Montoya; P. Del Ángel

doi:10.1016/j.jssc.2007.08.023

Synthesis and physicochemical properties of Zr-MCM-41 mesoporous molecular sieves and Pt/H₃PW₁₂O₄₀/Zr-MCM-41 catalysts

L. F. Chen, J. A. Wang, L. E. Noreña, J. Aguilar, J. Navarrete, P. Salas, J. A. Montoya, P. Del Ángel

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

59 Scopus citations

Abstract

For the first time, modifications of the surface and framework of Si-MCM-41 by depositing a heteropolyacid on the surface and by introducing foreign Zr⁴⁺ ions into the framework are investigated. The Zr-modified Si-MCM-41 mesoporous materials (hereafter referred as WSZn, n=Si/Zr=25, 15, 8, 4) were synthesized through a surfactant-templated preparation approach, using low-cost fumed silica as the Si precursor. After impregnation with 25 wt% of H₃PW₁₂O₄₀, the surface Brönsted acidity of the Pt/H₃PW₁₂O₄₀/WSZn catalysts was greatly enhanced by 2-10 times relative to the bare WSZn support. Two kinds of supported heteropolyacids were formed: (i) bulk-like heteropolyacid crystals with unchanged Keggin structures, and (ii) highly dispersed heteropolyacid with distorted Keggin units. The formation of various kinds of heteropolyacid structures is closely related to the interaction between the heteropolyanions and the hydroxyl groups in the host support.

Original language	English
Pages (from-to)	2958-2972
Number of pages	15
Journal	Journal of Solid State Chemistry
Volume	180
Issue number	10
DOIs	https://doi.org/10.1016/j.jssc.2007.08.023
State	Published - Oct 2007
Externally published	Yes

Keywords

Acidity
Catalyst
Heteropolyacids
Keggin structure
Mesoporous molecular sieves
Zr-MCM-41

Access to Document

10.1016/j.jssc.2007.08.023

Cite this

@article{510b68f69f8f4048ae668d7b1fe91919,

title = "Synthesis and physicochemical properties of Zr-MCM-41 mesoporous molecular sieves and Pt/H3PW12O40/Zr-MCM-41 catalysts",

abstract = "For the first time, modifications of the surface and framework of Si-MCM-41 by depositing a heteropolyacid on the surface and by introducing foreign Zr4+ ions into the framework are investigated. The Zr-modified Si-MCM-41 mesoporous materials (hereafter referred as WSZn, n=Si/Zr=25, 15, 8, 4) were synthesized through a surfactant-templated preparation approach, using low-cost fumed silica as the Si precursor. After impregnation with 25 wt% of H3PW12O40, the surface Br{\"o}nsted acidity of the Pt/H3PW12O40/WSZn catalysts was greatly enhanced by 2-10 times relative to the bare WSZn support. Two kinds of supported heteropolyacids were formed: (i) bulk-like heteropolyacid crystals with unchanged Keggin structures, and (ii) highly dispersed heteropolyacid with distorted Keggin units. The formation of various kinds of heteropolyacid structures is closely related to the interaction between the heteropolyanions and the hydroxyl groups in the host support.",

keywords = "Acidity, Catalyst, Heteropolyacids, Keggin structure, Mesoporous molecular sieves, Zr-MCM-41",

author = "Chen, {L. F.} and Wang, {J. A.} and Nore{\~n}a, {L. E.} and J. Aguilar and J. Navarrete and P. Salas and Montoya, {J. A.} and {Del {\'A}ngel}, P.",

note = "Funding Information: L.F. Chen wishes to acknowledge the scholarship for her study of the doctorate degree offered by the CONACyT-Mexico. The financial support from the projects CGPI-IPN-2006067 and CONACyT (Mexico)-NSF (China) J110.426/2005 is appreciated. The authors would like to thank Dr. P. P{\'e}rez and Dr. I. Hern{\'a}ndez for their help in the characterization of the samples.",

year = "2007",

month = oct,

doi = "10.1016/j.jssc.2007.08.023",

language = "Ingl{\'e}s",

volume = "180",

pages = "2958--2972",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

number = "10",

}

TY - JOUR

T1 - Synthesis and physicochemical properties of Zr-MCM-41 mesoporous molecular sieves and Pt/H3PW12O40/Zr-MCM-41 catalysts

AU - Chen, L. F.

AU - Wang, J. A.

AU - Noreña, L. E.

AU - Aguilar, J.

AU - Navarrete, J.

AU - Salas, P.

AU - Montoya, J. A.

AU - Del Ángel, P.

N1 - Funding Information: L.F. Chen wishes to acknowledge the scholarship for her study of the doctorate degree offered by the CONACyT-Mexico. The financial support from the projects CGPI-IPN-2006067 and CONACyT (Mexico)-NSF (China) J110.426/2005 is appreciated. The authors would like to thank Dr. P. Pérez and Dr. I. Hernández for their help in the characterization of the samples.

PY - 2007/10

Y1 - 2007/10

N2 - For the first time, modifications of the surface and framework of Si-MCM-41 by depositing a heteropolyacid on the surface and by introducing foreign Zr4+ ions into the framework are investigated. The Zr-modified Si-MCM-41 mesoporous materials (hereafter referred as WSZn, n=Si/Zr=25, 15, 8, 4) were synthesized through a surfactant-templated preparation approach, using low-cost fumed silica as the Si precursor. After impregnation with 25 wt% of H3PW12O40, the surface Brönsted acidity of the Pt/H3PW12O40/WSZn catalysts was greatly enhanced by 2-10 times relative to the bare WSZn support. Two kinds of supported heteropolyacids were formed: (i) bulk-like heteropolyacid crystals with unchanged Keggin structures, and (ii) highly dispersed heteropolyacid with distorted Keggin units. The formation of various kinds of heteropolyacid structures is closely related to the interaction between the heteropolyanions and the hydroxyl groups in the host support.

AB - For the first time, modifications of the surface and framework of Si-MCM-41 by depositing a heteropolyacid on the surface and by introducing foreign Zr4+ ions into the framework are investigated. The Zr-modified Si-MCM-41 mesoporous materials (hereafter referred as WSZn, n=Si/Zr=25, 15, 8, 4) were synthesized through a surfactant-templated preparation approach, using low-cost fumed silica as the Si precursor. After impregnation with 25 wt% of H3PW12O40, the surface Brönsted acidity of the Pt/H3PW12O40/WSZn catalysts was greatly enhanced by 2-10 times relative to the bare WSZn support. Two kinds of supported heteropolyacids were formed: (i) bulk-like heteropolyacid crystals with unchanged Keggin structures, and (ii) highly dispersed heteropolyacid with distorted Keggin units. The formation of various kinds of heteropolyacid structures is closely related to the interaction between the heteropolyanions and the hydroxyl groups in the host support.

KW - Acidity

KW - Catalyst

KW - Heteropolyacids

KW - Keggin structure

KW - Mesoporous molecular sieves

KW - Zr-MCM-41

UR - http://www.scopus.com/inward/record.url?scp=35248853787&partnerID=8YFLogxK

U2 - 10.1016/j.jssc.2007.08.023

DO - 10.1016/j.jssc.2007.08.023

M3 - Artículo

AN - SCOPUS:35248853787

SN - 0022-4596

VL - 180

SP - 2958

EP - 2972

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

IS - 10

ER -

Synthesis and physicochemical properties of Zr-MCM-41 mesoporous molecular sieves and Pt/H₃PW₁₂O₄₀/Zr-MCM-41 catalysts

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this