Abstract
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 (SBET). After 4 h of calcination at 550 °C, the basal spacing (d001) and SBET of AlFe-PILC was still maintained at 1.91 nm and 318 m2/g, respectively. Large SBET and d001-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.
Highlights
Chlorinated volatile organic compounds (CVOCs) are considered to be very harmful to the environment, a direct harm on human health and destroy the ozone layer [1,2].Today, the major industrial processes for CVOCs elimination involve direct combustion at very high temperatures
A popular research topic in recent years is synthesizing pillared clays (PILCs) supported catalysts for VOCs catalytic combustion reactions [26,27,28], whereas the application for CVOCs combustion is rare and the structure-activity relationship was not clear. It has been reported in the literature that SBET, pore volume (V p ), and thermal stability of PILC can be improved by the synthesis composite pillaring agents, and these mixed pillaring agents has been widely used in the past 30 years [29]
The diffraction peaks of Fe2 O3 appeared in all the AlFe-PILC based catalysts because the amount of Fe2 O3 increased after AlFe pillaring process
Summary
Chlorinated volatile organic compounds (CVOCs) are considered to be very harmful to the environment, a direct harm on human health and destroy the ozone layer [1,2]. A popular research topic in recent years is synthesizing PILCs supported catalysts for VOCs catalytic combustion reactions [26,27,28], whereas the application for CVOCs combustion is rare and the structure-activity relationship was not clear. It has been reported in the literature that SBET , pore volume (V p ), and thermal stability of PILC can be improved by the synthesis composite pillaring agents, and these mixed pillaring agents has been widely used in the past 30 years [29]. The adsorption/desorption properties and catalytic performance of CB were systematically studied in order to get a clear map about the structure–activity relationship for the catalytic reaction and explore its potential for further industrial application
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