Low-temperature catalytic degradation of chlorinated aromatic hydrocarbons over bimetallic Ce-Zr/UiO-66 catalysts

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2021-06, Vol.414, p.128782, Article 128782
• Main Authors: Fan, Yun, Zhang, Haijun, Ren, Meihui, Zhang, Yichi, Li, Yun, Wang, Longxing, Chen, Jiping
• Format: Article
• Language: English
• Subjects: Bimetallic MOF; Chlorinated aromatic hydrocarbons; Dioxins; Solid waste incineration
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2021.128782

[Display omitted] •Bimetallic Ce-Zr/UiO-66 catalysts were prepared by a solvothermal synthesis method.•Ce0.2Zr0.8/UiO-66 had high catalytic activity for CAHs degradation at 100–150 °C.•Only tiny amounts of PCDD/Fs were formed during CAHs degradation.•Dechlorination and oxidation were both responsible for the degradation of CAHs. It is of great significance to develop the low-temperature catalysts for the reduction in emission of chlorinated aromatic hydrocarbons (CAHs) from the industrial thermal processes. In this work, the bimetallic Ce-Zr/UiO-66 catalysts were synthesized by a solvothermal method to degrade CAHs. Powder X-ray diffraction, Fourier transform infrared spectra and X-ray photoelectron spectroscopy analyses showed that cerium was successfully incorporated into the lattice of Zr/UiO-66 without destroying the structure of metal–organic frameworks. The activities of Ce-Zr/UiO-66 catalysts for CAHs degradation varied with the concentration of cerium. Ce0.2Zr0.8/UiO-66 with the highest surface area (1502 m2 g−1) presented the highest efficiency (>85%) for hexachlorobenzene degradation at low heating temperature (100–150 °C) with less formation of polychlorinated dibenzo-p-dioxins and dibenzofurans. Appropriate amount of water (5 wt%) and nitrogen atmosphere were beneficial to improve degradation efficiency. The degradation products proved that hydrodechlorination and oxidation of CAHs both occurred on the catalysts.