Revealing the Structure-Activity Dependency of NiO-La2O3/DMSN for CO2 Methanation

Articles in Press

Document Type : Original Article

Authors

1 Ph.D. Student of Chemical Engineering, Razi University, Kermanshah, Iran

2 Basic Science, Faculty of Petroleum, Petroleum University of Technology ,

3 Razi University, Kermanshah, Iran

10.22034/ijche.2023.386026.1291

Abstract

A novel and highly efficient NiO-La2O3/DMSN catalyst was synthesized through two distinct methods including citrate complex (C) and wet impregnation (I) techniques. The catalytic activity of both methods was evaluated for the carbon dioxide methanation process. The physicochemical properties of the synthesized compounds were analyzed in detail by XRD, N2 adsorption-desorption, FESEM, EDX, and Elemental-mapping analyses. XRD analysis revealed that method (C) produced crystal oxides with a size less than half of that produced by method (I). The performance of the NiO-La2O3/DMSN(C) was markedly superior to that of NiO-La2O3/DMSN(I) across the entire investigated temperature range. Notably, maximum catalytic performance of NiO-La2O3/DMSN(C) was achieved with a CO2 conversion of 78.6% and CH4 selectivity of 96.35% at 400 °C. Method (C) led to the formation of highly dispersed nanoparticles with smaller crystalline size, predominantly in the support pores, by strengthening the interaction between La3+ and Ni2+. This considerably improved CO2 conversion and CH4 selectivity of the catalyst. Moreover, the loading of NiO-La2O3 on DMSN by method (C) resulted in an outstanding performance in comparison to the supports utilized in other studies (like MCF and CeO2) in similar operational conditions. These outcomes highlight the unique structural advantages of DMSN and substantial impact of the synthesis method on the catalyst structure and the subsequent performance.

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Iranian Chemical Engineering Journal

Articles in Press, Accepted Manuscript
Available Online from 01 May 2023

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