Zheng Xie, Chen Shijie, Liu Wanning, Xiang Kaisong, Liu Hui
School of Metallurgy and Environment, Central South University, Changsha 410083, China.
Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China.
Polymers (Basel). 2022 Jul 2;14(13):2717. doi: 10.3390/polym14132717.
CF has a global warming potential of 6500 and possesses a lifetime of 50,000 years. In this study, we modified the HZSM-5 catalyst with Ce and sulfuric acid treatment. The S/Ce/HZSM-5 catalyst achieves 41% of CF conversion at 500 °C, which is four times higher than that over Ce/HZSM-5, while the HZSM-5 exhibits no catalytic activity. The effects of modification were studied by using NH-TPD, FT-IR of pyridine adsorption, and XPS methods. The results indicated that the modification, especially the sulfuric acid treatment, strongly increased the Lewis acidic sites, strong acidic sites, and moderate acidic sites on catalysts, which are the main active centers for CF decomposition. The mechanism of acidic sites increases by modification and CF decomposition is clarified. The results of this work will help the development of more effective catalysts for CF decomposition.
CF的全球变暖潜能值为6500，且其寿命长达50000年。在本研究中，我们用铈和硫酸处理对HZSM - 5催化剂进行了改性。S/Ce/HZSM - 5催化剂在500℃时实现了41%的CF转化率，这比Ce/HZSM - 5催化剂的转化率高四倍，而HZSM - 5则没有催化活性。通过NH - TPD、吡啶吸附的FT - IR和XPS方法研究了改性效果。结果表明，改性，尤其是硫酸处理，显著增加了催化剂上的路易斯酸位点、强酸位点和中强酸位点，这些是CF分解的主要活性中心。阐明了改性导致酸性位点增加和CF分解的机理。这项工作的结果将有助于开发更有效的CF分解催化剂。
