PGM nanoparticle-based alumina aerogels for three-way catalyst applications

PGM nanoparticle-based alumina aerogels for three-way catalyst applications
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用于三效催化剂应用的基于 PGM 纳米颗粒的氧化铝气凝胶

DOI:
10.1016/j.catcom.2022.106547
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发表时间:
2022
影响因子:
3.7
通讯作者:
Carroll, Mary K.
Carroll, Mary K.
中科院分区:
化学3区
文献类型:
--
作者:
Anderson, Ann M.;Bruno, Bradford A.;Santos, Joana;Barry, Patrick J.;Carroll, Mary K.

文献摘要

相似文献

制备并表征了掺杂 PGM 纳米粒子的氧化铝气凝胶,作为三效催化剂 (TWC) 的候选材料。在 800 °C 热处理后,材料保持低密度 (∼0.1 g/mL)、高表面积 (290–460 m2/g) 和高孔体积 (1.4–3.6 g/m3),但显示出纳米颗粒的一些团聚。 Pt-、Pd- 和 Rh- 氧化铝气凝胶的 TWC 活性可与商业催化剂相媲美。 Pd/Al2O3 气凝胶对 CO 和丙烯的起燃温度分别为 190 和 220 °C,而 Rh/Al2O3 气凝胶对 NO 的起燃温度为 250 °C。这些材料的负载量为 0.08–0.16 g/L (2–3 g/ft3),远低于典型的 TWC PGM 负载量 1.8–2.8 g/L (50–80 g/ft3)。
Alumina aerogels doped with PGM nanoparticles are prepared and characterized as candidates for three-way catalysts (TWCs). After heat-treatment at 800 °C the materials maintain low density (∼0.1 g/mL), high surface area (290–460 m2/g) and high pore volume (1.4–3.6 g/m3), but show some agglomeration of the nanoparticles. Pt-, Pd- and Rh-alumina aerogels show TWC activity comparable to a commercial catalyst. Light-off temperatures for CO and propene by Pd/Al2O3aerogels are 190 and 220 °C (respectively) while for NO by Rh/Al2O3aerogel is 250 °C. These materials are loaded at 0.08–0.16 g/L (2–3 g/ft3), considerably lower than typical TWC PGM loadings of 1.8–2.8 g/L (50–80 g/ft3).