Fig. 3: Catalytic performance in CH4 oxidation.
From: Magnetically tunable selectivity in methane oxidation enabled by Fe-embedded liquid metal catalysts
a, Schematic diagram of the reaction device. b, Production rates of liquid products (CH3OOH and CH3COOH) for Fe–LMS controlled by an external magnetic field. Data are represented as the mean ± s.d. from five parallel experiments. c, Production rates of gaseous products (CO and CO2) for Fe–LMS controlled by an external magnetic field. Data are represented as the mean ± s.d. from five parallel experiments. d, Correlation between the production rate of CH3COOH and additionally applied CO partial pressure for Fe–LMS@H2O under a 500-G magnetic field. e, 13C NMR spectra of liquid product for Fe–LMS without a magnetic field. Experimental conditions: 2 MPa 13CH4, 25 ml H2O2 (6%), pH 4, r.t., 1 h (red line); 2 MPa 12CH4, 25 ml H2O2 (6%), pH 4, r.t., 1 h (grey line). f, 13C NMR spectra of liquid product for Fe–LMS with a 500-G magnetic field. Experimental conditions: 2 MPa 13CH4, 25 ml H2O2 (6%), pH 4, r.t., 1 h (red line); 2 MPa 13CH4 + 0.5 MPa 12CO, 25 ml H2O2 (6%), pH 4, r.t., 1 h (green line); 2 MPa 12CH4, 25 ml H2O2 (6%), pH 4, r.t., 1 h (grey line). g, Correlation between selectivity of liquid products and magnetic induction intensity. Data are represented as the mean ± s.d. from five parallel experiments. h, Selectivity of CH3COOH for Fe–LMS when applying multiple off–on operations of a magnetic field. Each operation lasts for 1 h and CH4 is refilled after each operation.
