Methane oxidation with O 2 over Cu/SAPO catalysts with different Cu loadings. a) CH 4 conversion, b) yield of HCHO, c) yield of CO and d) yield of H 2 .

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... Sci. Technol. This journal is © The Royal Society of Chemistry 2025 other metal catalysts (Fig. S3 †). Thus, the yields of HCHO, CO and H 2 were appreciably higher in the reaction over the Cu/SAPO catalyst than those over the other catalysts (Fig. 1). The yield of HCHO, CO and H 2 was evaluated to be 0.7, 5.4 and 2.2%, respectively, at the methane conversion of 8.2% in the reaction over the Cu/SAPO catalyst at 923 K. It is meaningful ...

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... catalytic performance of Cu/SAPO for methane oxidation with O 2 was examined in detail. Fig. 3 shows the results for methane oxidation with O 2 over Cu/SAPO catalysts with different Cu loadings. Cu loadings in the catalysts were adjusted to be 0.3, 0.5, 1.0 or 1.5 wt%. The XRD patterns of these catalysts showed only diffraction lines due to SAPO34 as shown Fig. S7, † suggesting that Cu species were highly dispersed for all the ...

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... catalytic activity of Cu/SAPO for methane oxidation became higher with Cu loading. The amount of Cu cations in the catalyst bed was larger with the Cu loading in the catalysts since the same amount of the catalysts (0.050 g) was packed in the catalyst beds for all the reactions in Fig. 3. The selectivity to each product slightly depends on the Cu loading in the catalysts as shown in Fig. S8. † HCHO, CO and H 2 in addition to CO 2 and H 2 O were formed in the reaction over all the Cu/SAPO catalysts regardless of Cu loading. Selectivities to HCHO and H 2 were decreased and instead those to CO 2 and H 2 O were increased ...