1 Electronic supplementary information Catalytic selective oxidation of isobutane over Csx(NH4)3-xHPMo11VO40 mixed salts Fangli JING, Benjamin KATRYNIOK, Franck DUMEIGNIL, Elisabeth BORDES-RICHARD and Sébastien PAUL*, Index 1. Experimental ....................................................................................................................... 2 2. Results ................................................................................................................................. 2 2.1. Raman spectroscopy ..................................................................................................... 2 2.2. FT-IR for the used catalysts .......................................................................................... 3 2.3. XRD for the spent catalysts .......................................................................................... 4 2.4. Nitrogen physisorption ................................................................................................. 4 2.5. Acidity determined by NH3-TPD ................................................................................. 5 References ................................................................................................................................... 6 Electronic Supplementary Material (ESI) for Catalysis Science & Technology. This journal is © The Royal Society of Chemistry 2014