TiO2-supported heteropoly acids for low-temperature synthesis of dimethyl ether from methanol.

-Highlights: [•] TiO2-supported HPAs are very active for low-temperature DME production. [•] H2O molecules between Keggin units on HPA/TiO2 are weakly bonded leading higher reaction rates. [•] The acidity of HPAs and HPA/TiO2 is very strong. [•] The Keggin structure is stable upon deposition on TiO2 until ca. 723K. [ABSTRACT FROM AUTHOR]