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Carbon monoxide oxidation on LaCoO3 perovskite type catalysts prepared by reactive grinding

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Author Affiliations

  • 1Department of Chemical Engineering Institute of Technology, Nirma University, Ahmedabad-382481, INDIA

Res. J. Recent Sci., Volume 1, Issue (ISC-2011), Pages 152-159, (2012)

Abstract

Perovskite oxides are used as promising three way catalysts for the removal of exhaust gases because of their low cost, thermal andmechanical stability at relatively high temperature, great diversity and excellent redox properties The major traditional drawbackof perovskites is the low specific surface area (usually several m2/g) due to their preparation that involves a rather hightemperature (often as high as 8000C) to ensure the formation of the crystalline phase. This suppresses their activity and to somedegree limits their application. A new preparation method called reactive grinding was developed for the synthesis of perovskites atroom temperature via high-energy ball milling resulting in a relatively high surface area. Perovskite type mixed oxides LaCoO3with high specific surface area was prepared by reactive grinding. These catalysts was characterized by X-ray diffraction (XRD),Scanning electron microscope (SEM) - Energy dispersive X-ray spectroscopy (EDX or EDS) and BET surface analysis. Theformation of the perovskite structure has been shown by X-ray diffraction (XRD) for all samples. The catalytic performance of thesamples for carbon monoxide was evaluated. LaCoO3 found significantly more active than a reference sample prepared byconventional synthesis method using amorphous citrate complexes. The activity per unit surface area was found to depend ongrinding conditions and calcinations temperature. These enhanced activities are associated with both rather high surface area andhigh defect density reached by the reactive grinding synthesis method.

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