Enhanced Long - term Stability and Carbon Resistance of Ni/Mn x O y - Al 2 O 3 Catalyst in Near - equilibrium CO 2 Reforming of Methane for Syngas Production

Abstract

Herein we study the catalytic activity/stability of a new generation of cheap and readily available Ni and Al-based catalysts using two Mn precursors, namely Mn(NO3)2and Mn(EDTA)2-complex in the reaction of CO2reforming of methane. In this respect, Ni/Al2O3and two types of Ni/MnxOy-Al2O3catalysts were successfully synthesized and characterized using various analytical techniques: TGA, ICP, XRD, BET, FTIR, TPR-H2, SEM-EDX, TEM, XPS, and TPO-O2. Utilization of Mn(EDTA)2-as synthetic precursor successfully furnished Ni/Al2O3-MnxOyY (Y = EDTA) catalyst which was more active during CO2reforming of methane when compared to Ni/MnxOy-Al2O3cata-lyst, synthesized using Mn(NO3)2precursor. Compared to Ni/MnxOy-Al2O3, Ni/Al2O3-MnxOyY catalyst afforded near-equilibrium conversion values at 700 °C (ca. 95% conversion for CH4and CO2, and H2/CO = 0.99 over 50 h re-action time). Also, Ni/Al2O3-MnxOyY showed more resistance to carbon formation and sintering; interestingly, after 50 h reaction time, the size of Ni0particles in Ni/MnxOy-Al2O3almost doubled while that of Ni/Al2O3-MnxOyY re-mained unchanged. The elevated conversion of CO2and CH4in conjunction with the observed low carbon deposi-tion on the surface of our best catalyst (Ni/Al2O3-MnxOyY) indicated the presence of MnxOyoxide positioning medi-ated simultaneous in-situcarbon elimination with subsequent generation of oxygen vacant sites on the surface for more CO2adsorption. Copyright © 2020 BCREC Group. All rights reserved