Three-way catalysts containing palladium and/or rhodium were prepared using γ­Al₂O₃ doped with lanthanum oxide as a support. All the samples were obtained by an incipient wetness impregnation of the support with an aqueous solution of nitrates. In order to investigate the metal–support interaction, the support was additionally calcined at 800 °C before the impregnation procedure. Characterization of the support thermally treated within a range of 600–1000 °C by low-temperature nitrogen absorption, X-ray diffraction analysis, and electron paramagnetic resonance spectroscopy has revealed that the treatment conditions strongly affect the textural properties, the phase composition and the concentration of electron-donor sites on the surface of the support. Deposition of metals by the impregnation of initial support with a joint solution of Pd and Rh nitrates has led to formation of small Pd–Rh alloyed nanoparticles with strong metal–metal interaction, which was confirmed by a testing reaction of ethane hydrogenolysis. No alloy formation was observed in the case of mechanical mixing of the separately prepared Pd-only and Rh-only catalysts as well as in the case of preliminary calcined support impregnated with a joint solution of Pd and Rh nitrates. Bimetallic Pd–Rh catalyst of alloyed type was shown to be the most promising in terms of catalytic performance and thermal stability.

三通使用的γ-Al中制备含有钯和/或铑催化剂₂ ö ₃掺杂有氧化镧作为载体。通过用硝酸盐水溶液对载体进行初期湿润浸渍而获得所有样品。为了研究金属与载体之间的相互作用，在浸渍之前，还要在800°C下煅烧载体。通过低温氮吸收，X射线衍射分析和电子顺磁共振波谱对在600–1000°C范围内进行热处理的载体进行表征，结果表明，处理条件严重影响了织构性质，相组成和合金强度。载体表面上电子给体位点的浓度。通过用Pd和Rh硝酸盐的联合溶液浸渍初始载体来沉积金属，导致形成了具有强金属-金属相互作用的小的Pd-Rh合金纳米颗粒，这一点已通过乙烷氢解的测试反应得到了证实。在机械混合单独制备的仅Pd和Rh的催化剂的情况下，以及在预煅烧的载体中浸渍有Pd和Rh硝酸盐的联合溶液的情况下，均未观察到合金的形成。就催化性能和热稳定性而言，合金类型的双金属Pd-Rh催化剂被证明是最有前途的。在单独混合的仅含Pd和Rh的催化剂进行机械混合的情况下，以及用Pd和Rh硝酸盐的联合溶液浸渍的预煅烧载体的情况下，均未观察到合金的形成。就催化性能和热稳定性而言，合金类型的双金属Pd-Rh催化剂被证明是最有前途的。在机械混合单独制备的仅Pd和Rh的催化剂的情况下，以及在预煅烧的载体中浸渍有Pd和Rh硝酸盐的联合溶液的情况下，均未观察到合金的形成。就催化性能和热稳定性而言，合金类型的双金属Pd-Rh催化剂被证明是最有前途的。