Structural characterization and catalytic properties of bis(1,1,3,3-tetramethylguanidinium) dichromate |
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Authors: | Johannes Due-Hansen Kenny StåhlSoghomon Boghosian Anders RiisagerRasmus Fehrmann |
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Institution: | a Department of Chemistry, Centre for Catalysis and Sustainable Chemistry, Technical University of Denmark, 2800 Lyngby, Denmark b Department of Chemical Engineering, University of Patras and FORTH/ICE-HT, GR-26500 Patras, Greece |
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Abstract: | The structure of bis(1,1,3,3-tetramethylguanidinium) dichromate was determined from powder X-ray diffraction data. The compound crystallizes in the monoclinic system (space group P21/n) with a = 10.79714 (15) Å, b = 11.75844 (16) Å, c = 8.15097 (11) Å, β = 109.5248 (6)°. The structure consists of dichromate anions (Cr2O72−) stabilized by tetramethylguanidinium cations (H2NC(N(CH3)2)2]+ or TMGH]+). Phase transitions of TMGH]2Cr2O7 were determined by differential scanning calorimetry, thermal gravimetric analysis and in situ Raman spectroscopy, where the decomposition of the matrix into CrOx was found at 171-172 °C. Further heat treatment to above 400 °C resulted in formation of the thermodynamically stable Cr2O3, most likely with the TMGH]+ cation as reductant. The catalytic activity of TMGH]2Cr2O7 supported on TiO2 anatase in the selective catalytic reduction (SCR) of nitrogen oxide was also investigated, however only moderate activity was observed in the temperature range 100-400 °C compared to the activity of e.g., vanadia supported on titania. |
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Keywords: | Structure XRD Catalysis Tetramethylguanidinium Dichromate |
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