Bo Feng,Yaxuan Jing,Xiaohui Liu,Yong Guo,Yanqin Wang
The upcycling of waste polyvinyl chloride (PVC) is a grand challenge because of the unmanageable Cl species. Here, we develop a Cl-transfer strategy to upcycle waste PVC into value-added organic chlorides and PE-like polymer with various Cl acceptors (tetrahydrofuran, dibutyl ether and butanol) over Ru/Al 2 O 3 catalyst. The high utilization efficiency of Cl (> 80 %) can be obtained over Ru/Al 2 O 3 at 180 °C, 2Mpa H 2 with tetrahydrofuran as an acceptor within tens of hours. The excellent performance is attributed to key features including Al 2 O 3 for the C-O bond activation and metal Ru for C-Cl bond activation and H 2 dissociation. The remaining PE-like polymer after removing Cl could be regarded as PE-like feedstock and further converted into methane through the same Ru/Al 2 O 3 catalyst. The Cl-transfer system also enables the upcycling of several common PVC-contained wastes and works well in the scale-up test. This work offers a catalytic path to integrate waste PVC plastic into the supply chain of organic chlorides under the context of circular economy.
Bowen Luo,Zhengchen Zhu,Xuebin Liang,Zhipeng Tian,Riyang Shu,Chao Wang,Ying Chen,Jianping Liu
The property of metal site affects the catalyst activity significantly. Herein, the effect of metal site influenced by metal particle size on lignin hydrogenolysis was explored. Four different preparation methods were employed to obtain Ru/Al 2 O 3 catalysts with different Ru metal particle size. Ru/Al 2 O 3 -IM catalyst with 10.5 nm Ru particle size only had 16.9 wt% yield of aromatic monomer products. While, Ru/Al 2 O 3 –BH catalyst that possessed the metal particle size of 3.6 nm obtained the high monomer yield of 31.7 wt%, with the a low selectivity of methoxy-containing products. Small metal particle size enabled to enhance hydrogen absorption and activation ability, which provided more active hydrogen species and improved lignin hydrogenolysis performance. It can also expose more metal sites to contact with substrates and promote the demethoxylation reaction to achieve more phenols products. The ratio of phenols/guaiacols product kept a good linear relation with Ru particle size. Moreover, Ru/Al 2 O 3 –BH catalyst with a small Ru particle size had a high TOF of 0.57 mol guaiacol mol Ru −1 min −1 , which was much larger than that of the other Ru/Al 2 O 3 catalysts with a large Ru particle size.
危险品化学品经营许可证（带存储）