Oxidation of 1-propanol to propionic acid with hydrogen peroxide catalysed by heteropolyoxometalates

BMC Chemistry

Table 1 Catalytic performance of different catalysts^a

Entry	Catalyst	Acid Strength /mV ^b	Redox potential /V ^c	Conversion /%	Yield/%	Selectivity/%
Entry	Catalyst	Acid Strength /mV ^b	Redox potential /V ^c	Conversion /%	Yield/%	Propionic acid	Propion-aldehyde	Propyl propionate	Others
1	–	–	–	9.36	3.87	41.35	52.56	–	6.09
2	(ProH)₄[SiW₁₂O₄₀]	446	0.06	41.71	13.68	32.80	47.85	10.91	8.44
3	(ProH)₃[PMo₁₂O₄₀]	427	0.11	30.82	18.31	59.41	29.88	6.72	3.99
4	(ProH)₃[PW₁₂O₄₀]	474	0.24	73.98	45.50	61.50	32.51	4.08	1.91
5	(ProH)₂[HPW₁₂O₄₀]	595	0.18	65.67	41.94	63.91	25.13	7.74	3.28
6	(ProH)[H₂PW₁₂O₄₀]	653	0.13	57.94	27.19	46.93	31.48	17.24	4.35
7	(AspH)₃[PW₁₂O₄₀]	490	0.19	69.99	40.53	57.91	25.29	6.97	9.83
8	(GluH)₃[PW₁₂O₄₀]	574	0.15	63.54	35.71	56.20	34.56	7.69	1.54
9	H₃PW₁₂O₄₀	732	0.13	64.53	36.05	55.87	28.17	13.23	2.73

^areaction conditions: n(1-propanol) = 10 mmol, n(catalyst) = 0.1 mmol, n(30%H₂O₂) = 30 mmol, T = 60 °C, t = 6 h, solvent free; ^b0.2 mmol, 25 mL acetonitrile; ^coxidation potential Vs Ag/AgCl

ISSN: 2661-801X