The CO Methanation Over The Rh and Ru Promoted NiO-CeO2-ZrO2 Catalysts

Year 2018, Volume: 31 Issue: 4, 1064 - 1077, 01.12.2018

Filiz Balıkcı Derekaya , Yusuf Serkan Kılınc

Abstract

In this study, Rh and Ru promoted NiO-CeO₂-ZrO₂
catalysts were prepared with different Rh and Ru loadings (3, 4, 5 (wt.%)) by
using two different methods. N₂ phsisorption, X-Ray diffraction,
scanning electron microscope with energy-dispersive (SEM-EDX) techniques were
used in order to characterize the catalysts. Catalytic activities of the
catalysts were tested for CO methanation. The selective CO methanation
catalytic activity tests were made over the most active catalysts. The effect
of the Rh and Ru loading and preparation method on the CO methanation was
discussed. The Ru and Rh have different effect on the surface areas of the
catalysts and identifiable peaks for Rh and Ru not observed from the XRD
analysis. Because of the low ratio of Rh and Ru in catalysts structures, both
Ru and Rh containing catalysts gave similar CO methanation activity results.
The 50% conversion temperatures of the 3% Ru/NiO-CeO₂-ZrO₂
catalysts which were prepared by the co-precipitation and surfactant assisted
co-precipitation are 191 °C and 185 °C, respectively. Selective CO methanation was
made over the 3% Ru/NiO-CeO₂-ZrO₂ catalysts. Catalysts
gave good activity until 300 °C. Because of the reversed water gas shift
reaction activities of the catalysts were decreased after this temperature

Keywords

Methanation, Catalysts, Surfactant, Carbonmonoxide

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