Selective oxidation of propane over PMoVM/α‐Al₂O₃ (M: Co, Fe, or Ni)

Abstract

Alumina supported phosphovanodomolybdic acid and alumina supported phosphovanodomolybdic acid-transition metal ions (M: Fe 3+ , Co 2+ , or Ni 2+ ) were prepared by impregnation. The thermal decomposition, in situ at 400 • C, of supported catalysts showed the formation of

Oxygen Vacancies Induced by Pd Doping in Ni-P2O5/MoO3 Hollow Polyhedral Heterostructures for Highly Efficient Diethylamine Gas Sensing

“…Figure S5d shows that the spectral peaks associated with -OH, N–H, and others disappeared (505, 791, 1064, 1410, 1927, and 3210 cm –1 ), while new peaks appeared at 3438, 1628, 983, 865, 655, and 474 cm –1 after 100 min of SSR at 500 °C. The peaks at 3438/1628, 983/865, 655, and 474 cm –1 are attributable to metal orthophosphate stretching vibrations, MoO/Mo–O–Mo, P–O, and metal-M-O (Pd and Ni) bonds, respectively. ,− No absorption peaks of ammonium compounds were detected after calcination (Figure S5d), suggesting that they were evaporated and that the Pd 6% Ni-P 2 O 5 /MoO 3 HPHS was produced.…”

“…Peaks in the FTIR spectra of commercial AMP correspond to P–OM (M = surface metal), P–O–M, and N–H bonds in the NH 4+ stretching mode at wavenumbers of 1080, 1120, and 1400/3250 cm –1 . Moreover, the main bands are 965/590/505, 863/791, and 1927 cm –1 in AMP, corresponding to (P–O), (Mo–O)/(P–OH), (M–O–Mo), and phosphate ions (PO and HO-PO), respectively. , When Ni and Pd precursors were introduced into commercial AMP using the HT technique at 180 °C, slight shifts in the peaks, especially in the broadened bands of P–O and Mo–O, were observed in Figure S5b,c, implying that Ni and Pd affect these bonds. Figure S5d shows that the spectral peaks associated with -OH, N–H, and others disappeared (505, 791, 1064, 1410, 1927, and 3210 cm –1 ), while new peaks appeared at 3438, 1628, 983, 865, 655, and 474 cm –1 after 100 min of SSR at 500 °C.…”