Distribution of NiO/Al₂O₃/NiAl₂O₄ in the Fabrication of Spray-Dry Oxygen Carrier Particles for Chemical-Looping Combustion

Abstract

NiO/Al2O3, known as one of the most efficient oxygen carrier, has been fabricated by spray-drying method and calcinated at 1100 °C and 1300°C, and the structural characteristics are investigated using XRD, SEM, TEM and XPS. For the characterization of surface and bulk microstructure of the fabricated NiO/Al2O3oxygen carrier particle, investigated were 1) as-fabricated powders, 2) internal structure of the crumbled particles, and 3) cross-sectional specimens. The results showed that the fabricated oxygen carrier formed well distributed NiAl2O4with NiO particles of 100~500 nm via reaction keeping on the mole ratio. The oxygen carriers developed in this study showed pertinent characteristics for chemical-looping combustion, and good effect on the strength, indicating a potential for wide application in the future. The calcination at 1100 °C was good enough and as efficient as that at 1300 °C.

Supplied Oxygen Properties of NiO/NiAl2O4 in Chemical Looping Re-Forming of Biomass Pyrolysis Gas: The Influence of Synthesis Method

“…Both the lab scale experiment and the magnified instrument test illustrated that NiO/Al 2 O 3 was the potential option for CLC . However, NiO/Al 2 O 3 would form NiAl 2 O 4 , which would decrease the activity of OCs, ,− in the high temperature region (1100–1400 °C) or after redox cycles. Therefore, NiO/NiAl 2 O 4 was investigated as one of the promising oxygen carriers during CLR.…”

Effect of the Addition of CeO2 or MgO on the Oxygen Carrier Capacity and Rate of Redox Reactions of NiO/Fe2O3/Al2O3 Oxygen Carriers

“…Metal oxides such as Mn 2 O 3 , Fe 2 O 3 , NiO, CuO, and CoO have been used as OCs on supports such as bentonite, yttria-stabilized zirconia, Al 2 O 3 , MgO, TiO 2 , NiAl 2 O 4 , MgAl 2 O 4 , SiO 2 , and ZrO 2 . Since 2008, NiO on an Al 2 O 3 support has been viewed as the best OC for CLC. − …”

Spinel Ni(Al,Fe)2O4 Solid Solution as an Oxygen Carrier for Chemical Looping Combustion

“…Its costs should be low, and it should be ecofriendly. There are several candidate OCs that meet these requirements, including NiO/Ni, − ,, Cu 2 O/Cu, ,− ,, Mn 3 O 4 /MnO, ,− ,,, and Fe 2 O 3 /Fe 3 O 4 , ,,− and more than 100 OC particles have been reported. However, since 2008, carriers that are based on NiO as the active substance and Al 2 O 3 as the support substance have been seemingly a mainstream in CLC.…”