1. Figure S-1: Comparison of NH3-TPD for h-WOx (red, continuous line) and m-WO3 (blue, dashed line).
Supplementary information

2. 10 20 30 40 50 60 2 q a b c d
Figure S-2: XRD patterns of catalysts after MeOH test: a) h-WOx; b) WTiO; c) WNbO; d) WVO.

3. Selectivity or Conversion (%)20 40 60 80
100
260
300
340
380
420
Selectivity or Conversion (%)
Temperature (ºC) b a
Figure S-3. Glycerol dehydration in oxidative conditions over WTi O catalyst: contact time 0.15s (a); contact time 0.4s (b). Feed glycerol/oxygen/water/nitrogen= 2/4/40/54. Symbols: glycerol conversion (♦) and selectivity to acrolein (●), hevy-compounds (▲), COx (□), and others ().

4. 200
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Raman Shift (cm-1)
784
152
184
980 a b
Figure S-4: Raman spectra of catalyst WTiO after glycerol test: a) fresh sample; b) spent sample.