Promoting C–F Bond Activation for Perfluorinated Compounds Decomposition via Atomically Synergistic Lewis and Brønsted Acid Sites
Wenjie Luo, Kang Liu, Tao Luo, Junwei Fu, Hang Zhang, Chao Ma, Ting‐Shan Chan, Cheng‐Wei Kao, Zhang Lin, Liyuan Chai, Michelle L. Coote, Min Liu
Abstract
Catalytic hydrolysis is a sustainable method for the degradation of perfluorinated compounds (PFCs) but is challenged by the high reaction temperatures required to cleave strong C–F bonds. Herein, we developed an innovative C–F activation strategy by constructing synergistic Lewis and Brønsted acid pairs over atomically dispersed Zn–O–Al sites to promote C–F bond activation for decomposition of typical PFCs, CF 4 . Density functional theory (DFT) calculations demonstrate tricoordinated Al (Al III ) sites and Zn–OH functional, respectively, as Lewis and Brønsted acid sites over Zn–O–Al, synergistically enhancing the adsorption and decomposition of CF 4 . X-ray absorption spectroscopy (XAS), pyridine infrared spectroscopy (Py-IR), and ammonia temperature-programmed desorption (NH 3 -TPD) verified the presence of both Al III and Zn–OH on the atomically dispersed Zn–O–Al sites. CF 4 -TPD and in situ infrared spectroscopy confirmed that the Zn–O–Al sites facilitate CF 4 adsorption and C–F bond activation. As a result, the Zn–O–Al sites with synergistic Lewis and Brønsted acid pairs achieved 100% CF 4 decomposition at a low temperature of 560 °C and demonstrated outstanding stability for more than 250 h.