Thin-sheet microfibrous-structured Pd–MgO–Al₂O₃/Al-fiber catalysts were developed for high-throughput catalytic methane combustion with 3–15 vol% water vapor in feed gas. The catalysts were obtained by hydrothermally growing Mg–Al mixed-oxide precursors (e.g., layered double hydroxides (LDHs) plus MgCO₃) on Al-fiber surfaces followed by placing 0.5 wt% Pd on the as-obtained substrates by impregnation. Transformation of Pd/MgAl-LDH–MgCO₃ mounted on the Al-fiber into Pd-MgO-Al₂O₃ via in situ reaction activation markedly enhances the catalyst basicity and electron density of metallic Pd, thus weakening support electrophilicity and stabilizing PdO against the formation of inactive Pd⁴⁺ species. This preferred catalyst with high intrinsic activity (turnover frequency 135 h⁻¹ at 290 °C and 3 vol% water vapor) achieves a very low E_a of only 57 kJ mol⁻¹, a third that (170 kJ mol⁻¹) for the Pd/AlOOH/Al-fiber. This catalyst can stably run for feed gases of 1 vol% methane and 3–15 vol% water vapor in air.

薄板微纤维结构的Pd–MgO–Al ₂ O ₃ / Al纤维催化剂是为高通量催化甲烷燃烧而开发的，其原料气中水蒸气含量为3–15％。通过在铝纤维表面上水热生长Mg-Al混合氧化物前体（例如，层状双氢氧化物（LDHs加上MgCO ₃）），然后通过浸渍将0.5 wt％的Pd放置在所获得的基底上来获得催化剂。通过原位反应活化将固定在铝纤维上的Pd / MgAl-LDH-MgCO ₃转变为Pd-MgO-Al ₂ O ₃，显着提高了金属Pd的催化剂碱性和电子密度，从而削弱了载体亲电性并稳定了PdO惰性钯的形成⁴⁺种。这种具有高固有活性（在290°C下的转换频率为135 h ^-1和3 vol％的水蒸气）的优选催化剂可实现非常低的E _a，仅为57 kJ mol ^-1，而对于Ea则只有三分之一（170 kJ mol ^-1）。 Pd / AlOOH / Al纤维。该催化剂可以稳定地用于空气中1％（体积）的甲烷和3-15％（体积）的水蒸气的进料气。