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Open AccessArticle

High-Efficiency Catalytic Conversion of NOx by the Synergy of Nanocatalyst and Plasma: Effect of Mn-Based Bimetallic Active Species

by Yan Gao 1,2,3,*, Wenchao Jiang 1, Tao Luan 4,*, Hui Li 1,2,3, Wenke Zhang 1,2,3, Wenchen Feng 4 and Haolin Jiang 4
1
Department of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China
2
Key Laboratory of Renewable Energy Building Utilization Technology of Ministry of Education, Shandong Jianzhu University, Jinan 250101, China
3
Key Laboratory of Renewable Energy Building Application Technology of Shandong Province, Shandong Jianzhu University, Jinan 250101, China
4
Engineering Laboratory of Power Plant Thermal System Energy Saving of Shandong Province, Shandong University, Jinan 250061, China
*
Authors to whom correspondence should be addressed.
Catalysts 2019, 9(1), 103; https://doi.org/10.3390/catal9010103
Received: 30 November 2018 / Revised: 29 December 2018 / Accepted: 16 January 2019 / Published: 18 January 2019
(This article belongs to the Special Issue Plasma Catalysis)
Three typical Mn-based bimetallic nanocatalysts of Mn−Fe/TiO2, Mn−Co/TiO2, Mn−Ce/TiO2 were synthesized via the hydrothermal method to reveal the synergistic effects of dielectric barrier discharge (DBD) plasma and bimetallic nanocatalysts on NOx catalytic conversion. The plasma-catalyst hybrid catalysis was investigated compared with the catalytic effects of plasma alone and nanocatalyst alone. During the catalytic process of catalyst alone, the catalytic activities of all tested catalysts were lower than 20% at ambient temperature. While in the plasma-catalyst hybrid catalytic process, NOx conversion significantly improved with discharge energy enlarging. The maximum NOx conversion of about 99.5% achieved over Mn−Ce/TiO2 under discharge energy of 15 W·h/m3 at ambient temperature. The reaction temperature had an inhibiting effect on plasma-catalyst hybrid catalysis. Among these three Mn-based bimetallic nanocatalysts, Mn−Ce/TiO2 displayed the optimal catalytic property with higher catalytic activity and superior selectivity in the plasma-catalyst hybrid catalytic process. Furthermore, the physicochemical properties of these three typical Mn-based bimetallic nanocatalysts were analyzed by N2 adsorption, Transmission Electron Microscope (TEM), X-ray diffraction (XRD), H2-temperature-programmed reduction (TPR), NH3-temperature-programmed desorption (TPD), and X-ray photoelectron spectroscopy (XPS). The multiple characterizations demonstrated that the plasma-catalyst hybrid catalytic performance was highly dependent on the phase compositions. Mn−Ce/TiO2 nanocatalyst presented the optimal structure characteristic among all tested samples, with the largest surface area, the minished particle sizes, the reduced crystallinity, and the increased active components distributions. In the meantime, the ratios of Mn4+/(Mn2+ + Mn3+ + Mn4+) in the Mn−Ce/TiO2 sample was the highest, which was beneficial to plasma-catalyst hybrid catalysis. Generally, it was verified that the plasma-catalyst hybrid catalytic process with the Mn-based bimetallic nanocatalysts was an effective approach for high-efficiency catalytic conversion of NOx, especially at ambient temperature. View Full-Text
Keywords: NOx conversion; DBD plasma; Manganese; bimetal; nanocatalyst NOx conversion; DBD plasma; Manganese; bimetal; nanocatalyst
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MDPI and ACS Style

Gao, Y.; Jiang, W.; Luan, T.; Li, H.; Zhang, W.; Feng, W.; Jiang, H. High-Efficiency Catalytic Conversion of NOx by the Synergy of Nanocatalyst and Plasma: Effect of Mn-Based Bimetallic Active Species. Catalysts 2019, 9, 103.

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