Chromia-vanadia catalysts supported on TiO{sub 2}: Effect of composition on the physicochemical properties and catalytic performance for the selective catalytic reduction of NO with NH{sub 3}

Fountzoula, C; Papadopoulou, C; Kordulis, C; Matralis, H K; Voyiatzis, G A

doi:10.1006/jcat.1999.2392

Title: Chromia-vanadia catalysts supported on TiO{sub 2}: Effect of composition on the physicochemical properties and catalytic performance for the selective catalytic reduction of NO with NH{sub 3}

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Abstract

Chromia-vanadia on titania catalysts containing 8 mol% (Cr + V) were prepared and tested for the selective catalytic reduction (SCR) of NO by NH{sub 3}, in excess O{sub 2}, in the temperature range 250--450 C. The physicochemical properties of the prepared catalysts as well as those of the corresponding single active phase-containing samples were investigated by specific surface area and pore volume measurements, X-ray powder analysis, UV-visible diffuse reflectance spectroscopy, laser-Raman microscopy, X-ray photoelectron spectroscopy, analytical electron microscopy, and temperature-programmed reduction experiments. The best catalytic performance was achieved by the catalyst containing 2 mol% Cr and 6 mol% V (TiCr{sub 2}V{sub 6}), while all the binary active phase-containing catalysts proved to be more active than the corresponding single active phase-containing catalysts is attributed to a synergy developed between the two active phases. This synergy is maximized in the TiCr{sub 2}V{sub 6} sample, where a new Raman band, at 971 cm{sup {minus}1}, has also been observed. This peak is attributed to isolated Cr{sup 6+} species decorated by well-dispersed V{sup 5+} species. Deposition of the chromia phase on the titania surface stabilizes the texture of the final catalysts against changes provoked by deposition of the vanadia phase.

Authors:

Fountzoula, C; Papadopoulou, C; Kordulis, C ^[1]; Matralis, H K; Voyiatzis, G A ^[2]

Univ. of Patras (Greece). Dept. of Chemistry
Inst. of Chemical Engineering and High Temperature Chemical Processes, Patras (Greece)

Publication Date:: Sat May 15 00:00:00 EDT 1999

OSTI Identifier:: 354379

Resource Type:: Journal Article

Journal Name:: Journal of Catalysis

Additional Journal Information:: Journal Volume: 184; Journal Issue: 1; Other Information: PBD: 15 May 1999

Country of Publication:: United States

Language:: English

Subject:: 54 ENVIRONMENTAL SCIENCES; 01 COAL, LIGNITE, AND PEAT; NITRIC OXIDE; SELECTIVE CATALYTIC REDUCTION; AMMONIA; CHROMIUM OXIDES; VANADIUM OXIDES; CATALYTIC EFFECTS; CATALYST SUPPORTS; TITANIUM OXIDES; PHYSICAL PROPERTIES; CHEMICAL PROPERTIES; PERFORMANCE TESTING

Citation Formats


                    Fountzoula, C, Papadopoulou, C, Kordulis, C, Inst. of Chemical Engineering and High Temperature Chemical Processes, Patras, Matralis, H K, and Voyiatzis, G A. Chromia-vanadia catalysts supported on TiO{sub 2}: Effect of composition on the physicochemical properties and catalytic performance for the selective catalytic reduction of NO with NH{sub 3}.  United States: N. p., 1999. 
        Web.  doi:10.1006/jcat.1999.2392.

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                    Fountzoula, C, Papadopoulou, C, Kordulis, C, Inst. of Chemical Engineering and High Temperature Chemical Processes, Patras, Matralis, H K, & Voyiatzis, G A. Chromia-vanadia catalysts supported on TiO{sub 2}: Effect of composition on the physicochemical properties and catalytic performance for the selective catalytic reduction of NO with NH{sub 3}.  United States.  https://doi.org/10.1006/jcat.1999.2392

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                    Fountzoula, C, Papadopoulou, C, Kordulis, C, Inst. of Chemical Engineering and High Temperature Chemical Processes, Patras, Matralis, H K, and Voyiatzis, G A. 1999.  
        "Chromia-vanadia catalysts supported on TiO{sub 2}: Effect of composition on the physicochemical properties and catalytic performance for the selective catalytic reduction of NO with NH{sub 3}".  United States.  https://doi.org/10.1006/jcat.1999.2392.

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@article{osti_354379,

  title        = {Chromia-vanadia catalysts supported on TiO{sub 2}: Effect of composition on the physicochemical properties and catalytic performance for the selective catalytic reduction of NO with NH{sub 3}},

  author       = {Fountzoula, C and Papadopoulou, C and Kordulis, C and Inst. of Chemical Engineering and High Temperature Chemical Processes, Patras and Matralis, H K and Voyiatzis, G A},

  abstractNote = {Chromia-vanadia on titania catalysts containing 8 mol% (Cr + V) were prepared and tested for the selective catalytic reduction (SCR) of NO by NH{sub 3}, in excess O{sub 2}, in the temperature range 250--450 C. The physicochemical properties of the prepared catalysts as well as those of the corresponding single active phase-containing samples were investigated by specific surface area and pore volume measurements, X-ray powder analysis, UV-visible diffuse reflectance spectroscopy, laser-Raman microscopy, X-ray photoelectron spectroscopy, analytical electron microscopy, and temperature-programmed reduction experiments. The best catalytic performance was achieved by the catalyst containing 2 mol% Cr and 6 mol% V (TiCr{sub 2}V{sub 6}), while all the binary active phase-containing catalysts proved to be more active than the corresponding single active phase-containing catalysts is attributed to a synergy developed between the two active phases. This synergy is maximized in the TiCr{sub 2}V{sub 6} sample, where a new Raman band, at 971 cm{sup {minus}1}, has also been observed. This peak is attributed to isolated Cr{sup 6+} species decorated by well-dispersed V{sup 5+} species. Deposition of the chromia phase on the titania surface stabilizes the texture of the final catalysts against changes provoked by deposition of the vanadia phase.},

  doi          = {10.1006/jcat.1999.2392},

  url          = {https://www.osti.gov/biblio/354379},
  journal      = {Journal of Catalysis},
number       = 1,

  volume       = 184,

  place        = {United States},

  year         = {Sat May 15 00:00:00 EDT 1999},

  month        = {Sat May 15 00:00:00 EDT 1999}

}

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