Abstract
The inert CC and C-C bonds is a major limitation for the degradation and utilization of rubber wastes, which has resulted in the increasingly serious environmental crisis. Here we developed an efficient strategy to catalyze complete cleavage of CC and C-C bonds in natural rubber by the enhanced reaction activity of Ru-based catalysts with the modulated ZrO2 crystal phases. And 95.0% of gas carbon yield with 98.6 mol% of CH4 and 1.4 mol% of C2-C4 hydrocarbons was achieved over Ru/m-ZrO2, which was more than 3 times higher than gas carbon yield over Ru/c-ZrO2 and Ru/t-ZrO2. The investigation on reaction pathway displayed that the primary hydrogenation of CC bonds with high bond energy would promote the transformation of natural rubber. The Ru0 species and spill-over hydrogen in Ru/m-ZrO2 catalyst acted in synergy for the catalytic hydrogenolysis of natural rubber. Ultimately, various rubber wastes were directly converted to natural gas, it could provide a new perspective for the chemical upcycling of the accumulated rubber wastes.
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