Synthesis and catalytic properties of porous Nb-Mo oxide solid acid

Caio Tagusagawa; Atsushi Takagaki; Ai Iguchi; Kazuhiro Takanabe; Junko N. Kondo; Kohki Ebitani; Takashi Tatsumi; Kazunari Domen

doi:10.1016/j.cattod.2010.10.049

Synthesis and catalytic properties of porous Nb-Mo oxide solid acid

Caio Tagusagawa, Atsushi Takagaki, Ai Iguchi, Kazuhiro Takanabe, Junko N. Kondo, Kohki Ebitani, Takashi Tatsumi, Kazunari Domen^*

^*Corresponding author for this work

Physical Sciences and Engineering

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

18 Scopus citations

Abstract

Several porous Nb_xMo_10-x mixed oxides prepared from NbCl₅ and MoCl₅ in the presence of block copolymer surfactant Pluronic P-123 were examined as potential solid acid catalysts. Amorphous mesoporous structures were observed in samples with x from 10 to 9, whereas samples with higher Mo concentrations (x = 3-8) formed large pores by inter-particle voids and a non-porous structures with crystallized molybdenum oxide (MoO₃) were observed in samples with x from 0 to 2. The acid strength increased with increasing the Mo content in Nb_xMo _10-x oxides, which was determined by NH₃ temperature-programmed desorption (NH₃-TPD) and Fourier transform infrared (FT-IR) spectroscopy using pyridine as a probe molecule. Porous Nb ₃Mo₇ oxide exhibited the highest acid-catalytic activity for the Friedel-Crafts alkylation of anisole due not only to mole ratio of Nb/Mo but also to pore structure.

Original language	English (US)
Pages (from-to)	358-363
Number of pages	6
Journal	Catalysis Today
Volume	164
Issue number	1
DOIs	https://doi.org/10.1016/j.cattod.2010.10.049
State	Published - Apr 30 2011

Keywords

FT-IR
Friedel-Crafts alkylation
Porous metal oxide
Solid acid

ASJC Scopus subject areas

Catalysis
General Chemistry

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10.1016/j.cattod.2010.10.049

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title = "Synthesis and catalytic properties of porous Nb-Mo oxide solid acid",

abstract = "Several porous NbxMo10-x mixed oxides prepared from NbCl5 and MoCl5 in the presence of block copolymer surfactant Pluronic P-123 were examined as potential solid acid catalysts. Amorphous mesoporous structures were observed in samples with x from 10 to 9, whereas samples with higher Mo concentrations (x = 3-8) formed large pores by inter-particle voids and a non-porous structures with crystallized molybdenum oxide (MoO3) were observed in samples with x from 0 to 2. The acid strength increased with increasing the Mo content in NbxMo 10-x oxides, which was determined by NH3 temperature-programmed desorption (NH3-TPD) and Fourier transform infrared (FT-IR) spectroscopy using pyridine as a probe molecule. Porous Nb 3Mo7 oxide exhibited the highest acid-catalytic activity for the Friedel-Crafts alkylation of anisole due not only to mole ratio of Nb/Mo but also to pore structure.",

keywords = "FT-IR, Friedel-Crafts alkylation, Porous metal oxide, Solid acid",

author = "Caio Tagusagawa and Atsushi Takagaki and Ai Iguchi and Kazuhiro Takanabe and Kondo, {Junko N.} and Kohki Ebitani and Takashi Tatsumi and Kazunari Domen",

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doi = "10.1016/j.cattod.2010.10.049",

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AU - Tagusagawa, Caio

AU - Takagaki, Atsushi

AU - Iguchi, Ai

AU - Takanabe, Kazuhiro

AU - Kondo, Junko N.

AU - Ebitani, Kohki

AU - Tatsumi, Takashi

AU - Domen, Kazunari

PY - 2011/4/30

Y1 - 2011/4/30

N2 - Several porous NbxMo10-x mixed oxides prepared from NbCl5 and MoCl5 in the presence of block copolymer surfactant Pluronic P-123 were examined as potential solid acid catalysts. Amorphous mesoporous structures were observed in samples with x from 10 to 9, whereas samples with higher Mo concentrations (x = 3-8) formed large pores by inter-particle voids and a non-porous structures with crystallized molybdenum oxide (MoO3) were observed in samples with x from 0 to 2. The acid strength increased with increasing the Mo content in NbxMo 10-x oxides, which was determined by NH3 temperature-programmed desorption (NH3-TPD) and Fourier transform infrared (FT-IR) spectroscopy using pyridine as a probe molecule. Porous Nb 3Mo7 oxide exhibited the highest acid-catalytic activity for the Friedel-Crafts alkylation of anisole due not only to mole ratio of Nb/Mo but also to pore structure.

AB - Several porous NbxMo10-x mixed oxides prepared from NbCl5 and MoCl5 in the presence of block copolymer surfactant Pluronic P-123 were examined as potential solid acid catalysts. Amorphous mesoporous structures were observed in samples with x from 10 to 9, whereas samples with higher Mo concentrations (x = 3-8) formed large pores by inter-particle voids and a non-porous structures with crystallized molybdenum oxide (MoO3) were observed in samples with x from 0 to 2. The acid strength increased with increasing the Mo content in NbxMo 10-x oxides, which was determined by NH3 temperature-programmed desorption (NH3-TPD) and Fourier transform infrared (FT-IR) spectroscopy using pyridine as a probe molecule. Porous Nb 3Mo7 oxide exhibited the highest acid-catalytic activity for the Friedel-Crafts alkylation of anisole due not only to mole ratio of Nb/Mo but also to pore structure.

KW - FT-IR

KW - Friedel-Crafts alkylation

KW - Porous metal oxide

KW - Solid acid

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Synthesis and catalytic properties of porous Nb-Mo oxide solid acid

Abstract

Keywords

ASJC Scopus subject areas

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