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As carbon monoxide has a broad spectrum of biological activities, its production by plasma is a significant advantage in medicine. This paper presents a comparative study of the CO production of two plasma jets: a MHz‐jet and a kHz‐jet. Both were fed with a helium gas with CO2 ${\text{CO}}_{2}$ admixture (0%–1%). CO was produced by CO2 ${\text{CO}}_{2}$ dissociation and its maximal concentration was hundreds of parts per million, which is safe for clinical applications. For the same specific energy input, the CO production was more efficient for the kHz‐jet than the MHz‐jet. Both had antibacterial properties on Escherichia coli, and the addition of CO2 ${\text{CO}}_{2}$ improved them for the MHz‐jet, while it reduced them for the kHz‐jet. [ABSTRACT FROM AUTHOR]

CO, ethylene, and CH3CH2OH can be converted to ethyl propionate by ethylene hydroesterification. The RuCl3 complex catalytic system (RuCl3‐DMF‐NaI‐NaOH) is reported for ethylene hydroesterification in this paper. The function mechanisms of each substance of the catalytic system have been analyzed. The catalytic activity of RuCl3 is increased by DMF (N,N‐dimethylformamide) as the ligand. The formation of 3‐pentanone is prevented by NaI by accelerating the termination rate at which ethyl attacks the propionyl species, while the formation of acetal is inhibited by NaOH. The formation mechanism of ethyl propionate has been analyzed. In‐depth researches have been done on the reaction temperature, catalyst concentration, and other factors influencing the performance of catalytic system. In RuCl3‐DMF‐NaI‐NaOH catalytic system, at reaction conditions (180°C, P(C2H4) = P(CO) = 1.5 MPa), after 4 h reaction, the conversion of ethylene reaches 87.1% with 92.8% selectivity of ethyl propionate. This work provides a neoteric catalytic system for the synthesis of ethyl propionate by ethylene hydroesterification. [ABSTRACT FROM AUTHOR]