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Hydrogenolysis of consumer-grade high-density polyethylene (HDPE) is a pivotal strategy for upcycling plastic waste into value-added fuels. Though Ru catalysts demonstrated activity in the hydrogenolysis of inert C–C bonds of HDPE, the precise design of Ru nanoparticles still represents a critical challenge to boost the performance. Here, ultrafine Ru nanoparticles (∼1 nm) supported on MgAl-layered double oxides (MgAl-LDO) exhibited a selectivity over 90% for liquid fuels, lubricants, and waxes in the hydrogenolysis of HDPE. By tuning the thermal treatments and Mg/Al ratios, the Ruδ+/Ru0 ratio and acidity/basicity of MgAl-LDO were determined as critical performance descriptors. Notably, the confining effects of the layered structure of MgAl-LDO can be optimized to facilitate the effective dispersion of Ru nanoparticles, even at elevated loadings of up to 9%. Moreover, the Ru/Mg1Al-LDO catalyst exhibited good applicability in the hydrogenolysis of various HDPE substrates and excellent stability, maintaining the structure and activity in five recycling runs.
Yan et al. (Wed,) studied this question.
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