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Preparation and characterization of mesoporous VOx–TiO2 complex oxides for the selective oxidation of methanol to dimethoxymethane

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Abstract.
Mesoporous VOx–TiO2 with high surface areas were prepared using the procedure of evaporationinduced
self-assembly combined with ammonia posttreatment. The samples were characterized by Xray diffraction (XRD), laser Raman spectroscopy (LRS), transmission electron microscopy (TEM), N2 adsorption, temperature-programmed reduction (H2-TPR), microcalorimetry for the adsorption of NH3, and isopropanol probe reaction. Their catalytic activities were evaluated for the reaction of selective oxidation of methanol to dimethoxymethane (DMM). It was found that the VOx–TiO2 materials exhibited high surface areas with pore diameters of 4 nm. The vanadia species were highly dispersed in the VOx–TiO2 within 30 wt% VOx content, evidenced by the results of XRD and LRS. The VOx–TiO2 samples exhibited both surface acidic and redox properties. The surface acidity was further enhanced on the addition of SO42-. The catalyst SO42-/30VOx—TiO2 exhibited good performance for the selective oxidation of methanol (57% conversion) to DMM (83% selectivity) at 423 K.

Keywords:
Mesoporous VOx–TiO2
Dispersion of vanadia
Surface acidic and redox properties
Selective oxidation of methanol
Synthesis of dimethoxymethane

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Informasi Detail

Judul Seri

Journal of Colloid and Interface Science

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Colloid and Interface Science 335 (2009) 216–221

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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