Catalytic performance promoted on Pt-based diesel oxidation catalyst assisted by polyvinyl alcohol
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RESEARCH ARTICLE
Catalytic performance promoted on Pt-based diesel oxidation catalyst assisted by polyvinyl alcohol Yanli Liang 1 & Xinmei Ding 2 & Jianli Wang 2 & Ming Zhao 2 & Yi Dan 1 & Long Jiang 1 & Yaoqiang Chen 2 Received: 18 February 2020 / Accepted: 30 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Eliminating vehicle emission is of importance due to the severe limit value. The work reports a convenient strategy of improving dispersion of platinum-based catalyst with the assistance of polyvinyl alcohol in a varied addition amount. Following the “twostep” annealing techniques, the catalytic performance of the polymer-assisted catalysts in diesel was obviously enhanced because of the improved dispersion of the platinum. Based on experimental results, the long chains of polymer resulting in the steric effect are presumed to isolate platinum ion, inhibiting the aggregation of platinum particles and then improving its dispersion. And the hydroxyl bonding between the polymers could convey electron to platinum species, leading to the lower platinum valence state. Both effects are positive resulting in an excellent NO maximum conversion of around 65% at the optimal introduction of 5 mass% of polymer, as the diesel oxidation catalyst (DOC), which could be inclined to a good purification in the diesel aftertreatment. Hopefully, the convenient research method could initiate the exploration and application of polymer-assisted catalysts for well-dispersed noble metal nanoparticles in eliminating exhaust emission. Keywords Vehicle emission . Polyvinyl alcohol . Platinum . Well-dispersed . Good purification
Introduction Eliminating the emission of CO, hydrogen carbon (HC), and nitrogen oxides (NOx) from vehicles is a societal need for serious environmental pollution problems which are harmful to human health (Al-Harbi et al. 2012; Shi et al. 2018). Much tighter emission limits have been stated in Euro 6 regulations for clean air (Johnson 2017). Take the commercial diesel aftertreatment, for example, an efficient diesel oxidation
Responsible Editor: Philippe Garrigues Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-09974-9) contains supplementary material, which is available to authorized users. * Jianli Wang [email protected] * Yi Dan [email protected] 1
State Key Laboratory of Polymer Materials Engineering of China, Polymer Research Institute of Sichuan University, Chengdu 610065, China
2
College of Chemistry, Sichuan University, Chengdu 610064, China
catalyst (DOC) is used to completely oxidize CO and HC to CO2 and H2O and to create exothermic heat for actively regenerating a diesel particulate filter (DPF). Another primary role is oxidation of NO to NO2, continuously oxidizing soot in DPF and promoting the selective catalytic reduction (SCR) efficiency in diesel aftertreatment system (Dadi et al. 2018; Johnson 2013; Uchisawa et al. 2014). Noble metals, Pt and Pd, have been extensively used in the commercial DOC (diesel
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