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Open AccessArticle

Catalytic Oxidation of NO over LaCo1−xBxO3 (B = Mn, Ni) Perovskites for Nitric Acid Production

1
Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU), Sem Sælands vei 4, NO-7491 Trondheim, Norway
2
SINTEF Industry, Kinetic and Catalysis Group, P.O. Box 4760 Torgarden, NO-7465 Trondheim, Norway
3
YARA Technology Center, Herøya Forskningspark, Bygg 92, Hydrovegen 67, NO-3936 Porsgrunn, Norway
*
Author to whom correspondence should be addressed.
Catalysts 2019, 9(5), 429; https://doi.org/10.3390/catal9050429
Received: 31 March 2019 / Revised: 30 April 2019 / Accepted: 3 May 2019 / Published: 8 May 2019
(This article belongs to the Special Issue Catalysis by Metals on Perovskite-Type Oxides)
Nitric acid (HNO3) is an important building block in the chemical industry. Industrial production takes place via the Ostwald process, where oxidation of NO to NO2 is one of the three chemical steps. The reaction is carried out as a homogeneous gas phase reaction. Introducing a catalyst for this reaction can lead to significant process intensification. A series of LaCo1−xMnxO3 (x = 0, 0.25, 0.5 and 1) and LaCo1−yNiyO3 (y = 0, 0.25, 0.50, 0.75 and 1) were synthesized by a sol-gel method and characterized using N2 adsorption, ex situ XRD, in situ XRD, SEM and TPR. All samples had low surface areas; between 8 and 12 m2/g. The formation of perovskites was confirmed by XRD. The crystallite size decreased linearly with the degree of substitution of Mn/Ni for partially doped samples. NO oxidation activity was tested using a feed (10% NO and 6% O2) that partly simulated nitric acid plant conditions. Amongst the undoped perovskites, LaCoO3 had the highest activity; with a conversion level of 24.9% at 350 °C; followed by LaNiO3 and LaMnO3. Substitution of LaCoO3 with 25% mol % Ni or Mn was found to be the optimum degree of substitution leading to an enhanced NO oxidation activity. The results showed that perovskites are promising catalysts for NO oxidation at industrial conditions. View Full-Text
Keywords: NO oxidation; catalytic oxidation; nitric oxide; perovskite; nitric acid; ostwald’s process; in situ; LaCoO3; LaMnO3; LaNiO3 NO oxidation; catalytic oxidation; nitric oxide; perovskite; nitric acid; ostwald’s process; in situ; LaCoO3; LaMnO3; LaNiO3
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MDPI and ACS Style

Salman, A.u.R.; Hyrve, S.M.; Regli, S.K.; Zubair, M.; Enger, B.C.; Lødeng, R.; Waller, D.; Rønning, M. Catalytic Oxidation of NO over LaCo1−xBxO3 (B = Mn, Ni) Perovskites for Nitric Acid Production. Catalysts 2019, 9, 429. https://doi.org/10.3390/catal9050429

AMA Style

Salman AuR, Hyrve SM, Regli SK, Zubair M, Enger BC, Lødeng R, Waller D, Rønning M. Catalytic Oxidation of NO over LaCo1−xBxO3 (B = Mn, Ni) Perovskites for Nitric Acid Production. Catalysts. 2019; 9(5):429. https://doi.org/10.3390/catal9050429

Chicago/Turabian Style

Salman, Ata u.R.; Hyrve, Signe M.; Regli, Samuel K.; Zubair, Muhammad; Enger, Bjørn C.; Lødeng, Rune; Waller, David; Rønning, Magnus. 2019. "Catalytic Oxidation of NO over LaCo1−xBxO3 (B = Mn, Ni) Perovskites for Nitric Acid Production" Catalysts 9, no. 5: 429. https://doi.org/10.3390/catal9050429

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