Abstract
The Mn-containing mixed-oxide-supported bismuth oxychloride (BiOCl) catalysts were prepared by calcining their corresponding parent hydrotalcite supported BiOCl. The crystal structure of BiOCl was found to be intact during calcination, while significant differences appeared in the chemical state of Mn and the redox capacities of the catalysts before and after calcination. Compared to the hydrotalcite-supported catalysts, the mixed-oxide-supported BiOCl showed much higher catalytic performance in the oxidation removal of formaldehyde due to the synergetic catalysis of more surface oxygen vacancies and higher surface basicity. The complete removal of formaldehyde could be achieved at 70 °C, and the removal efficiency was maintained more than 90% for 21 h. A possible reaction mechanism was also proposed.
Highlights
Among volatile organic pollutants (VOCs), formaldehyde is one of the most harmful gases with the widest sources
The results revealed that pure bismuth oxychloride (BiOCl) hardly showed effective formaldehyde removal efficiency (Entry 2)
Conclusions xBiOCl/MnMgAlO was a promising catalyst in the low-temperature oxidation removal of formaldehyde in air
Summary
Among volatile organic pollutants (VOCs), formaldehyde is one of the most harmful gases with the widest sources. It was generally accepted that the introduction of the second or third metal oxides could influence the crystallization process of mixed oxides, which would induce a decrease in the particle sizes and an increase in the surface area This might afford the enhanced catalytic performance of mixed oxides in the removal reaction of formaldehyde in comparison with the single manganese oxide. Our consistent interests in the design of heterogeneous catalysts and the removal of organic pollutants pushed us to combine the catalytic characteristics of Mn-containing mixed oxides and BiOCl. In our previous report, we had found that CuNiAl-HT supported BiOCl exhibited effective catalytic performance in the selective oxidation of glycerol by 3% H2O2 [33]. The catalytic performance and stability of the obtained catalysts in the oxidation removal of formaldehyde were investigated, and the structure–activity relationship of catalysts and reaction mechanisms were discussed
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