Catalytic combustion of methane is considered an environmentally friendly route for energy generation owing to the high H/C ratio of methane and low CO₂ emissions compared to other hydrocarbons fuels. The utilization of heterogeneous catalysts permits combustion at lower temperatures compared with thermal combustion. Herein, we developed new catalysts of palladium-supported halloysite nanotubes (HNTs) for methane combustion. This was performed via chemical modification of HNTs using four different species i.e. H₂SO₄ (HNTs-H₂SO₄), NaOH (HNTs-NaOH), sodium dodecyl sulfate (HNTs-SDS), and cetyltrimethylammonium bromide (HNTs-CTAB). After chemical modification, Pd was deposited on the pretreated HNTs and the impact of chemical treatment on the morphology, crystal structure, textural properties, and methane oxidation activity was studied. All catalysts based on chemically modified HNTs exhibited enhanced catalytic performance towards methane combustion compared to Pd-supported on pristine HNTs, in particular, Pd/alkali-treated HNTs (Pd/HNTs-NaOH) revealed the highest catalytic activity towards methane combustion with the temperature of complete conversion (T₁₀₀) equals 385 °C and activation energy of 79.15 kJ mol⁻¹. Furthermore, the same sample displayed enhanced stability compared to other counterparts. This was assigned to the confinement of Pd nanoparticles at the inner surface which enhances the catalyst-support interaction, increases the number of surface active sites, and enhances the resistance to sintering at high temperatures.

甲烷的催化燃烧与其他碳氢化合物燃料相比，具有较高的甲烷H / C比和较低的CO ₂排放量，因此被认为是一种环境友好的能源生产途径。与热燃烧相比，利用非均相催化剂可以在较低的温度下燃烧。在本文中，我们开发了用于甲烷燃烧的钯负载埃洛石纳米管（HNT）的新型催化剂。这是通过使用四种不同的物质，即H ₂ SO ₄（HNTs-H ₂ SO ₄），NaOH（HNTs-NaOH），十二烷基硫酸钠（HNTs-SDS）和十六烷基三甲基溴化铵（HNTs-CTAB）。化学修饰后，Pd沉积在预处理的HNTs上，研究化学处理对形态，晶体结构，织构性质和甲烷氧化活性的影响。与原始HNT上负载的Pd相比，所有基于化学改性HNT的催化剂均表现出增强的甲烷燃烧催化性能，尤其是Pd /碱处理的HNT（Pd / HNTs-NaOH）在一定温度下显示出最高的甲烷燃烧催化活性。的完全转化率（T ₁₀₀）等于385°C，活化能为79.15 kJ mol ^-1。此外，同一个样品相比其他样品显示出更高的稳定性。这归因于内表面上Pd纳米颗粒的限制，这会增强催化剂与载体的相互作用，增加表面活性位点的数量，并增强高温下的抗烧结性。