Hydrogen Spillover-Induced Brønsted Acidity Enables Controllable Hydrocracking of Polyolefin Waste to Liquid Fuels

Xinlei Han, Yuchen Zhou, Shuangmei Chen, Huanhao Chen, Jiuxuan Zhang, Zhengyan Qu, Feng Zeng, Tuo Ji, Hong Jiang, Wei Cao, Zhenchen Tang, Rizhi Chen

科研成果: 期刊稿件文章同行评审

摘要

Efficient upcycling of polyolefin waste into liquid fuels remains challenging due to over-cracking and the lack of sufficient acidity in non-zeolitic catalysts. Here, we report a Ni/niobium oxide nanorod (Ni/NbOx) catalyst that achieves 95% selectivity to C5–20​ alkanes at full polyethylene (PE) conversion under mild conditions (240 °C), with minimal gaseous products (4%). The catalyst reaches a high liquid fuel formation rate of 1274 gliquid​ gNi−1​ h−1, rivaling noble metal systems. Its performance is governed by the morphology and crystallinity of NbOx nanorods, which provide sufficient acidity without micropore confinement, mitigating diffusion limitations and over-cracking. Detailed operando infrared spectroscopy and computational studies reveal, for the first time, that Brønsted acid sites, generated in situ via hydrogen spillover on the (110) facet, are the key catalytic sites in niobium oxide-based catalysts. The density of these acid sites exhibits a linear correlation with hydrocracking activity. The catalyst also demonstrates high efficiency across diverse polyolefin feedstocks and excellent reusability, offering a scalable and cost-effective solution for plastic upcycling.

源语言英语
期刊Angewandte Chemie - International Edition
DOI
出版状态已接受/待刊 - 2025

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