DOI: https://doi.org/10.9767/bcrec.13.1.1188.47-56

Synthesis and Evaluation of ABO3 Perovskites (A=La and B=Mn, Co) with Stoichiometric and Over-stoichiometric Ratios of B/A for Catalytic Oxidation of Trichloroethylene

Department of Chemical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran, Islamic Republic of

Received: 28 Apr 2017; Revised: 31 Jul 2017; Accepted: 4 Aug 2017; Published: 2 Apr 2018; Available online: 22 Jan 2018.
Open Access Copyright (c) 2018 by Authors, Published by BCREC Group
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Abstract

In this contribution, perovskite catalysts (ABO3) were probed that site A and site B were occupied by lanthanum and transition metals of manganese or cobalt, respectively, with stoichiometric ratios as well as 20 % over-stoichiometric ratios of B/A. The perovskite samples were synthesized using a gel-combustion method and characterized by BET, XRD, SEM and O2-TPD analyses. After mounting in a fixed bed reactor, the catalysts were examined in atmospheric pressure conditions at different temperatures for oxidation of 1000 ppm trichloroethylene in the air. Evaluation of over-stoichiometric catalysts activity showed that the increased ratio of B/A in the catalysts compared to the stoichiometric one led to BET surface area, oxygen mobility, and consequently catalytic performance improvement. The lanthanum manganite perovskite with 20 % excess manganese yielded the best catalytic performance among the probed perovskites. 

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Keywords: Oxidation; Volatile Organic Compound; Perovskite; Gel-combustion; Catalyst

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