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The article titled "Back Cover: Consumer Grade Polyethylene Recycling via Hydrogenolysis on Ultrafine Supported Ruthenium Nanoparticles" discusses the development of catalysts for the chemical recycling of high-density polyethylene. The researchers, led by Javier Pérez-Ramírez, found that 1-nm ruthenium particles supported on titania can effectively catalyze the hydrogenolysis of plastic caps used in soft drinks, converting them into C1-C45 alkanes. The study also examines the impact of common additives on the catalytic process. The authors provide valuable insights into the mechanistic routes and deactivation pathways involved in the recycling process. [Extracted from the article]

The potential implementation of ruthenium‐based catalysts in polyvinyl chloride production via acetylene hydrochlorination is hindered by their inferior activity and stability compared to gold‐based systems, despite their 4‐fold lower price. Combining in‐depth characterization and kinetic analysis we reveal the superior activity of ruthenium nanoparticles with an optimal size of 1.5 nm hosted on nitrogen‐doped carbon (NC) and identify their deactivation modes: 1) nanoparticle redispersion into inactive single atoms and 2) coke formation at the metal sites. Tuning the density of the NC carrier enables a catalytic encapsulation of the ruthenium nanoparticles into single layer graphene shells at 1073 K that prevent the undesired metal redispersion. Finally, we show that feeding O2 during acetylene hydrochlorination limits coke formation over the nanodesigned ruthenium catalyst, while the graphene layer is preserved, resulting in a stability increase of 20 times, thus rivalling the performance of gold‐based systems. [ABSTRACT FROM AUTHOR]

In their Communication, A. J. Saadun et al. study bimetallic systems of distinct composition and equivalent nanoparticle size, showing that the formation of dilute ruthenium alloys with iridium suppresses deactivating overhydrogenation or coking pathways observed on the respective monometallic systems. Bimetallic catalysts, hydrodebromination, iridium, nanoparticles, ruthenium Keywords: bimetallic catalysts; hydrodebromination; iridium; nanoparticles; ruthenium EN bimetallic catalysts hydrodebromination iridium nanoparticles ruthenium 1 1 1 01/25/22 20220121 NES 220121 B The Cover Feature b shows a bimetallic Ir-doped Ru nanoparticle supported on carbon with unprecedented selective and stable character in the hydrodebromination of dibromomethane to bromomethane. [Extracted from the article]