Template Free Synthesis of Ni-Perovskite: An Efficient Catalyst for Hydrogen Production by Steam Reforming of Bioglycerol

Abstract

Ni-based perovskite catalysts are prepared by two different methods and used as selective catalyst for hydrogen production from glycerol. The physicochemical properties of the catalysts were studied by X-ray diffraction, H2 temperature-programmed reduction, NH3 temperature-programmed desorption, N2 physisorption and TEM analysis. The effects of perovskite structure on the Ni particle size and acidity were studied, and the possibility of a nontemplate approach is examined. Steam reforming of bio-glycerol was carried out in a fixed bed down flow reactor at atmospheric pressure. The catalysts were compared with the Ni supported alumina; catalysts prepared with and without template were found to contain smaller nickel oxide particles and optimum acidity for good glycerol conversion and hydrogen selectivity. Under optimized reaction conditions, LaNiO3 (E) catalyst exhibited 72% glycerol conversion with 70% hydrogen selectivity. The Ni/Al2O3 catalyst with bigger nickel oxide particle size and moderately strong acidic sites results in quick deactivation, metal sintering, and predominantly filamentous carbon deposition due to the coke formation.

Alkaline modified A-site deficient perovskite catalyst surface with exsolved nanoparticles and functionality in biomass valorisation

“…The performance of the two best is attributed to the highly basic sites due to Ca and Sr dopants in La0.4Sr0.2Ca0.3Ni0.1Ti0.9O3-δ and the influence of the synergy due to Ni-Fe alloy in La0.5Sr0.4Fe0.1Ni0.1Ti0.8O3-δ in addition to the basic sites. The catalytic activity is comparable to what was reported by Ramesh and Venkatesha (2017) and Papaioannou et al (2019). The prevalence of the predominant gases is attributable to the exsolved nickel particles and rapid pyrolysis due to kinetic which has facilitated the gasification and oxidation of the glycerol carbonaceous decomposition products leading to the formation of CO as supported in related works (Wu et al, 2014;Ramesh and Venkatesha, 2017).…”

“…The catalytic activity is comparable to what was reported by Ramesh and Venkatesha (2017) and Papaioannou et al (2019). The prevalence of the predominant gases is attributable to the exsolved nickel particles and rapid pyrolysis due to kinetic which has facilitated the gasification and oxidation of the glycerol carbonaceous decomposition products leading to the formation of CO as supported in related works (Wu et al, 2014;Ramesh and Venkatesha, 2017). Other contributing factor that might have influenced the observed catalytic behaviour is the reverse water gas shift reaction (RWGSR).…”

Al‐Doped FeVO4 Nanoparticles for Vapour Phase Methylation of Phenol

“…The peaks observed at 724 and 711 eV corresponds to Fe 2p 1/2 and Fe 2p 3/2 respectively. The satellite peak at 718 eV confirmed that Fe exists in +3 oxidation state . The Peaks in Figure at 516 and 524 eV represent the V 2p 3/2 and V 2p 1/2 respectively, the characteristic peak of vanadium in +5 oxidation state.…”

“…The satellite peak at 718 eV confirmed that Fe exists in + 3 oxidation state. [19] The Peaks in Figure 5 at 516 and 524 eV represent the V 2p 3/2 and V 2p 1/2 respectively, the characteristic peak of vanadium in + 5 oxidation state. In Figure 5 the main peak at 529.5 eV corresponds to the O 1s lattice oxygen while the small hump at 531.6 eV represents the defect oxygen.…”

Flame Pyrolysis Synthesis of Mixed Oxides for Glycerol Steam Reforming

“…Perovskite-based catalysts were also tested for this application. For instance, LaNiO 3 tested at 650 °C led to 58 to 72% conversion, depending on the preparation method and conditions [ 53 , 54 ]. Moreover, when the Ni precursor was in the form of hydrotalcite, better performance and most of all stability was reported, attributing deactivation by coking to sintering of the Ni nanoparticles [ 17 ], in line with recent findings.…”