fig3

Figure 3. (A) Stability curves in CO oxidation of various catalysts calcined at 400 °C or dried at 60 °C. CO:O₂:He = 1:1:98, GHSV = 200,000 mL/g_cat·h for Au/F-60 and Au/FH-60 and 40,000 mL/g_cat·h for the others to avoid 100% CO conversion. Reproduced from Ref.^[117] with permission from the Royal Society of Chemistry. (B) Proposed scheme of changes of Ni state in partial oxidation of methane (POM) reaction. Reproduced with permission from Ref.^[102] with permission from Elsevier. (C) CH₄ conversion for Ca90NiP (20) catalyst was tested two times under increasing and decreasing temperatures. Reproduced from Ref.^[102] with permission from Elsevier. (D) HAP structure and influence of Ni-Ni coordination number on formate integrated area at 350 °C and CH₄ formation. Adapted from Ref.^[134] with permission from Wiley-VCH GmbH. (E) Activity and product distribution over reduced Rh (0.5)/HAP vs. time on stream in the POM reaction. Reaction conditions: 19,000 mL CH₄/g_cat·h, m_cat = 0.25 g, T = 973 K. Feed composition: 10%CH₄/5%O₂/N₂. Reproduced from Ref.^[112] with permission from Elsevier.