Fig. 1: The catalyst-free POM performance. | Nature Communications

Fig. 1: The catalyst-free POM performance.

From: Catalyst-free partial oxidation of methane under ambient conditions boosted by mechanical stirring-enhanced ultrasonic cavitation

Fig. 1

a Production rates of POM products and corresponding CH4 conversion rates at various stirring speeds. Reaction conditions: PCH4 = 0.1 bar, PO2 = 0.1 bar, PN2 = 0.8 bar, 298 K, ultrasonic source: frequency = 40 kHz, power density = 3.6 W cm−3. b Production rates of POM products and corresponding CH4 conversion rates under different oxygen pressures. Reaction conditions: Ptotal = 1 bar, 298 K, stirring speed = 600 rpm, ultrasonic source: frequency = 40 kHz, power density = 3.6 W cm−3. c–h The influence of reaction temperature (c), ultrasonic power density (d), ultrasonic frequency (e), solution PH (f), ion concentration (g), and stirring paddle materials (h) on the yield of POM products and CH4 conversion rates. Reaction conditions: PCH4 = 0.1 bar, PO2 = 0.1 bar, PN2 = 0.8 bar, stirring speed = 600 rpm. i Cycle test of POM in a closed system. Test conditions: PCH4 = 0.1 bar, PO2 = 0.1 bar, PN2 = 0.8 bar, 298 K, stirring speed = 600 rpm, ultrasonic source: frequency = 40 kHz, power density = 3.6 W cm−3. The term rpm stands for revolutions per minute. The error bars in (a–i) represent standard deviations (s.d.) obtained from n  =  3 independent measurements. Source data are provided as a Source Data file.

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