Abstract

The possibility of partial replacement of rhodium by iridium in palladium–rhodium bimetallic nanoparticles acting as active sites of three-way catalysts has been studied. Pd–Ir–Rh trimetallic alloy particles were obtained by the thermolysis of a solid solution of double complex salts containing palladium and the second metal (iridium or rhodium) under reducing conditions. It has been determined that all the three metals are uniformly distributed in the bulk of the catalyst in places of location of alloy nanoparticles. The trimetallic catalyst samples are not inferior in thermal stability to the bimetallic catalyst Pd–Rh/γ-Al₂O₃, provided that iridium is incorporated into the active cluster as Ir³⁺ ions. The partial replacement of rhodium by iridium reduces the cost of the new material.

中文翻译：

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含铱汽车排放控制催化剂

摘要

研究了作为三元催化剂活性位点的钯-铑双金属纳米粒子中铱部分取代铑的可能性。Pd-Ir-Rh 三金属合金颗粒是通过在还原条件下热解含有钯和第二种金属（铱或铑）的双络合物盐的固溶体获得的。已经确定，所有三种金属均均匀分布在合金纳米粒子所在位置的大部分催化剂中。三金属催化剂样品的热稳定性不亚于双金属催化剂 Pd–Rh/γ-Al ₂ O _{3 ，前提是铱以 Ir} ³⁺的形式并入活性簇中离子。用铱部分替代铑降低了新材料的成本。