Qiu Yingnan, Ye Na, Situ Danna, Zuo Shufeng, Wang Xianqin
Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, Shaoxing University, Shaoxing 312000, China.
Department of Chemical, Biological and Pharmaceutical Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA.
Materials (Basel). 2019 Mar 2;12(5):728. doi: 10.3390/ma12050728.
In this study, both AlFe composite pillaring agents and AlFe pillared clays (AlFe-PILC) were synthesized via a facile process developed by our group, after which mixed Cr and Ce precursors were impregnated on AlFe-PILC. Catalytic combustion of organic pollutant chlorobenzene (CB) on CrCe/AlFe-PILC catalysts were systematically studied. AlFe-PILC displayed very high thermal stability and large BET surface area (). After 4 h of calcination at 550 °C, the basal spacing () and of AlFe-PILC was still maintained at 1.91 nm and 318 m²/g, respectively. Large and -value, along with the strong interaction between the carrier and active components, improved the adsorption/desorption of CB and O₂. When the desorption temperatures of CB and O₂ got closer to the CB combustion temperature, the CB conversion could be increased to a higher level. CB combustion on CrCe/AlFe-PILC catalyst was determined using a Langmuir⁻Hinshelwood mechanism. Adsorption/desorption/oxidation properties were critical to design highly efficient catalysts for CB degradation. Besides, CrCe/AlFe-PILC also displayed good durability for CB combustion, whether in a humid environment or in the presence of volatile organic compound (VOC), making the catalyst an excellent material for eliminating chlorinated VOCs.
在本研究中，通过本课题组开发的简便方法合成了AlFe复合柱撑剂和AlFe柱撑黏土（AlFe-PILC），之后将Cr和Ce前驱体混合物浸渍在AlFe-PILC上。系统研究了CrCe/AlFe-PILC催化剂上有机污染物氯苯（CB）的催化燃烧。AlFe-PILC表现出非常高的热稳定性和较大的BET表面积（）。在550℃煅烧4小时后，AlFe-PILC的层间距（）和比表面积仍分别保持在1.91nm和318m²/g。较大的和值，以及载体与活性组分之间的强相互作用，改善了CB和O₂的吸附/脱附。当CB和O₂的脱附温度接近CB燃烧温度时，CB转化率可提高到更高水平。采用Langmuir-Hinshelwood机理确定了CrCe/AlFe-PILC催化剂上CB的燃烧过程。吸附/脱附/氧化性能对于设计高效的CB降解催化剂至关重要。此外，无论在潮湿环境中还是在挥发性有机化合物（VOC）存在的情况下，CrCe/AlFe-PILC对CB燃烧也表现出良好的耐久性，使其成为消除氯代VOCs的优良材料。
