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Solvent-based tandem conversion of PVC to PE-like material using hydrogen as atom economic reagent.

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The direct incorporation of CO2 into value-added base chemicals, such as methyl formate (MF), is a grand challenge to chemical science. In this work, a base-free cascade catalysis system is described to effectively convert carbon dioxide into MF. In the initial step a well-established Ru complex (i.e., RuHCl(dppm)2, dppm = 1,1-bis(diphenylphosphino)methane) is able to hydrogenate CO2 into formic acid, which subsequently undergoes a heterogeneous acid catalyzed esterification with methanol to selectively produce MF. Here, the small pore MOF UiO-66, a Zr-terephthalate, is identified as a promising heterogeneous acid and its Zr6 cluster is modified to understand the effect of Brønsted/Lewis acidity on the performance. Moreover, this heterogeneous acid catalyst could be reused for multiple times without significantly losing its activity.

Recycling of multilayer packaging is challenging due to the heterogeneity of plastic types that can be comingled by chemical bonding with adhesives. For this purpose, delamination of polyamide(PA)/polyolefin (PO) multilayers,...