For the combustion of methane, a partial replacement of platinum by rhodium leads to a significantly improved light-off behavior of the corresponding mixed Pt-Rh/γ-Al₂O₃ catalysts compared to a catalyst containing only Pt supported on γ-Al₂O₃. For all Pt-Rh/γ-Al₂O₃ catalysts, mixed PtRh crystals of low particle size were found. At 600 °C, the stability of catalysts, was found to increase with increasing rhodium content. The crystal size was determined by HR-TEM for spent catalyst samples after 40 h stability test. The samples containing higher amounts of rhodium showed smaller crystal size suggesting this as the origin of the increased catalyst stability.

甲烷的燃烧，部分替代铂的由铑通向显著改善燃相应的混合铂铑/行为的γ-Al _2个ö ₃催化剂相比，仅含有铂的催化剂负载在γ-Al系₂ O ₃。对于所有的铂铑/γ-Al系_2种ö ₃催化剂，混合的Pt发现低粒径的铑晶体。在600°C时，发现催化剂的稳定性随铑含量的增加而增加。40小时稳定性测试后，通过HR-TEM确定废催化剂样品的晶体尺寸。含铑量较高的样品显示出较小的晶体尺寸，表明这是催化剂稳定性提高的根源。