一种耐高温烧结Pt基三效催化剂及其制备方法

• Format: Patent
• Language: Chinese
• Published: 15.03.2024
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; THEIR RELEVANT APPARATUS; TRANSPORTING

本发明公开了汽油车催化剂技术领域的一种耐高温烧结Pt基三效催化剂及其制备方法，包括金属Pt和载体材料，金属Pt总负载量为0.2wt%～3.0wt%，载体材料包括储氧材料和氧化铝的混合物或者铈铝固溶体材料。本发明预分散过程，作用力较弱的材料提供较大的比表面积，从而使得贵金属Pt能在催化材料表面处于高度分散状态，当处于高温再分散过程时，Pt因为高温而发生迁移，部分Pt从作用力较弱的材料表面迁移，随后被作用力较强的材料捕集固定，使得Pt能够以原子状态再分散于材料表面，从而达到在高温下Pt不发生团聚烧结，仍具有优异的催化活性的目的。 The invention discloses a high-temperature-sintering-resistant Pt-based three-way catalyst and a preparation method thereof in the technical field of gasoline car catalysts, the high-temperature-sintering-resistant Pt-based three-way catalyst comprises metal Pt and a carrier material, the total loading capacity of the metal Pt is 0.2-3.0 wt%, and the carrier material comprises a mixture of an oxygen storage material and aluminum oxide or a cerium-aluminum solid solution material. In the pre-dispersion process, the material with the weak acting force provides a large specific surface area, so that the precious metal Pt can be in a highly dispersed state on the surface of the catalytic material, in the high-temperature re-dispersion process, Pt migra