Synthesis of Propylene Carbonate from Epoxide and CO₂ Catalyzed by Carbon Nanotubes Supported Fe_1.5PMo₁₂O₄₀

Table 2

Infrared absorption bands and symbol frequencies for the Keggin-type heteropolyanions catalysts (M = W or Mo).

Catalyst	Wavenumbers (cm^−1)
	(P-Oa)	(Mo-Od)	(Mo-Oc-Mo)	(Mo-Oc-Mo)
CuPMo	1064.74	964.66	872.43	782.61
ZnPMo	1065.59	963.72	873.63	779.10
FePMo	1065.42	963.22	869.94	781.21
CoPMo	1062.04	962.61	883.43	796.87