Mesoporous double-perovskite LaAMnNiO 6 (A = La, Pr, Sm) photothermal synergistic degradation of gaseous toluene
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School of Petrochemical Engineering, Changzhou University, Changzhou 213164, People’s Republic of China Center of Information Development and Management, Changzhou University, Changzhou 213164, People’s Republic of China a) Address all correspondence to these authors. e-mail: [email protected] b) e-mail: [email protected] c) These authors contributed equally to this work. 2
Received: 8 July 2019; accepted: 23 August 2019
A series of double-perovskite LaAMnNiO6 (A = La, Pr, Sm) catalysts with mesoporous morphology was prepared by a sol–gel method and further applied into photothermal synergistic degradation of gaseous toluene. Transmission electron microscopy and Brunauer–Emmett–Teller characterizations confirmed that doubleperovskite LaAMnNiO6 (A = La, Pr, Sm) had obvious mesoporous structure, which can provide a larger specific surface area and further enhancing the reactivity of catalyst. UV-vis and X-ray photoelectron spectroscopy characterization illustrated that LaSmMnNiO6 possessed higher adsorption oxygen content and light absorption capacity, which contribute to the occurrence of catalytic oxidation in the Mars–van Krevelen redox cycle mechanism. A group of active tests showed that the double-perovskite LaSmMnNiO6 catalyst had a lower reaction initiation temperature (starting reaction at 75 °C) and a lower activity temperature of optimal reaction (more than 90% at 255 °C). Moreover, the research on reaction kinetics of the catalyst demonstrated that LaAMnNiO6 (A = La, Pr, Sm) had lower activation energy and thus exhibited better catalytic activity. The results of the study indicate that the double-perovskite LaAMnNiO6 (A = La, Pr, Sm) has broad application prospects in the field of volatile organic pollutant degradation.
Introduction Volatile organic pollutants (VOCs) are organic gases with high vapor pressure and low water solubility, which are increasingly harmful to human life as an atmospheric pollutant [1]. If the human body is exposed to VOC-rich environments, it will have immeasurable consequences, which will cause a variety of diseases including lung, respiratory, and cardiovascular diseases, even leukemia, cancer, and other terminal illnesses [2, 3]. To protect human safety, the effective control and degradation of VOCs have attracted considerable attention [4–8], so that more and more researchers are committed to the detection, control, degradation, and emission of VOCs. At present, the effective degradation of VOCs is mainly concentrated in catalytic combustion, which can be divided into three categories: (i) noble metal catalysts; (ii) non-noble metal catalysts; and
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(iii) mixed-metal catalysts [9]. Among them, the perovskite phase catalyst has gained growing favor due to its higher lattice oxygen and better low-temperature combustion performance [10]. However, with the development of science and technology, the concepts of “green chemistry” and “low carbon chemistry” have become increasingly popular, and thus, the combination of catalytic combustion and pho
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