Fig. 6: Variation of chemical composition of the catalyst surface under reaction conditions. | Nature Communications

Fig. 6: Variation of chemical composition of the catalyst surface under reaction conditions.

From: Decoding technical multi-promoted ammonia synthesis catalysts

Fig. 6

NAP-XPS spectra of a Fe2p, b N1s, c K2p, d Al2p, e Si2p, and f Ca2p. From bottom to top, spectra display data collected at 250 °C, 500 °C, and after cooling to room temperature, respectively. Conditions of acquisition: 50 Pa, Deuterium:N2:Kr = 3:1:0.1. Further details are given in Supplementary Table 2.

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