<p>A copper tuned phosphotungstic acid (Cu-PTA) supported on TiO₂ catalyst is found to be highly stable, active and chemo-selective dehydration of glycerol to acrolein during gas phase under atmospheric pressure. A range of catalysts was produced by adjusting the active phase of Cu-PTA loadings between 10 and 40 wt% on the titania support. The characterization data provides information of Keggin ion structure was maintained even after higher active phase loading and moderate acidity inclined with loadings. FT-IR spectra results suggest, Keggin ion was retained after regeneration of catalyst. The catalytic properties are affected by active phase Cu-PTA loading, calcination temperature, reaction temperature, glycerol concentration, time on stream and regeneration studies. The overall optimized catalysts, 30 wt% catalyst possess higher amount moderate acidic sites and total acidity results 87% acrolein selectivity with 98% glycerol conversion at 325&#xa0;°C in atmospheric pressure. The regenerated catalyst exhibits similar catalytic performance compared to fresh catalyst is because of minimal change in acidity of catalyst after regeneration.</p> Graphical Abstract <p></p>