Influence of transition metal electronegativity on the oxygen storage capacity of perovskite oxides

2016 ◽  
Vol 52 (68) ◽  
pp. 10369-10372 ◽  
Author(s):  
Lu Liu ◽  
Daniel D. Taylor ◽  
Efrain E. Rodriguez ◽  
Michael R. Zachariah
Keyword(s):  
Transition Metal ◽  
Storage Capacity ◽  
Oxygen Storage Capacity ◽  
Perovskite Oxides ◽  
Oxygen Storage ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
Practical Development ◽  
Selection Of

The selection of highly efficient oxygen carriers (OCs) is a key step necessary for the practical development of chemical looping combustion (CLC).

Selection of Oxygen Carriers for Chemical-Looping Combustion

2004 ◽  
Vol 18 (2) ◽  
pp. 371-377 ◽  
Author(s):  
J. Adánez ◽  
L. F. de Diego ◽  
F. García-Labiano ◽  
P. Gayán ◽  
A. Abad ◽  
...  
Keyword(s):  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
Selection Of

scholarly journals Performance and Stability of Metal (Co, Mn, Cu)-Promoted La2O2SO4 Oxygen Carrier for Chemical Looping Combustion of Methane

Catalysts ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 147 ◽  
Author(s):  
Stefano Cimino ◽  
Gabriella Mancino ◽  
Luciana Lisi
Keyword(s):  
Oxygen Carrier ◽  
Combustion Process ◽  
Cost Effective ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Chemical Looping Combustion ◽  
Infrared Spectrometry ◽  
Chemical Looping ◽  
Reversible Redox ◽  
Temperature Programmed

Oxygen carrier materials based on La2O2SO4 and promoted by small amounts (1% wt.) of transition metals, namely Co, Mn and Cu, have been synthesized and characterized by means of X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), Temperature-programmed reduction/oxidation (TPR/TPO) and thermogravimetry-mass-Fourier transform infrared spectrometry (TG-MS-FTIR) experiments under alternating feeds in order to investigate their potential use for the Chemical Looping Combustion process using either hydrogen or methane as the fuel. The chemical looping reactivity is based on the reversible redox cycle of sulfur from S6+ in La2O2SO4 to S2− in La2O2S and entails a large oxygen storage capacity, but it generally requires high temperatures to proceed, challenging material stability and durability. Herein we demonstrate a remarkable improvement of lattice oxygen availability and activity during the reduction step obtained by cost-effective metal doping in the order Co > Mn > Cu. Notably, the addition of Co or Mn has shown a significant beneficial effect to prevent the decomposition of the oxysulfate releasing SO2, which is identified as the main cause of progressive deactivation for the unpromoted La2O2SO4.

Oxygen storage capacity of substituted YBaCo4O7+δ oxygen carriers

2018 ◽  
Vol 137 (1) ◽  
pp. 317-325 ◽  
Author(s):  
Limin Hou ◽  
Qingbo Yu ◽  
Kun Wang ◽  
Tuo Wang ◽  
Fan Yang ◽  
...  
Keyword(s):  
Storage Capacity ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Oxygen Carriers

scholarly journals Promising Impregnated Mn-based Oxygen Carriers for Chemical Looping Combustion of Gaseous Fuels

2017 ◽  
Vol 114 ◽  
pp. 334-343 ◽  
Author(s):  
T.R. Costa ◽  
P. Gayán ◽  
A. Abad ◽  
F. García-Labiano ◽  
L.F. de Diego ◽  
...  
Keyword(s):  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
Gaseous Fuels

Autothermal Reforming of Propane Over Ni Catalysts Supported on a Variety of Perovskites

2007 ◽  
Vol 7 (11) ◽  
pp. 4013-4016 ◽  
Author(s):  
SeungSoo Lim ◽  
DongJu Moon ◽  
JongHo Kim ◽  
YoungChul Kim ◽  
NamCook Park ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Storage Capacity ◽  
Flow Reactor ◽  
Oxygen Storage Capacity ◽  
Autothermal Reforming ◽  
Oxygen Storage ◽  
Hydrogen Yield ◽  
Impregnation Method ◽  
Ni Catalysts ◽  
Atmospheric Flow

Autothermal reforming of propane for hydrogen over Ni catalysts supported on a variety of perovskites was performed in an atmospheric flow reactor. Perovskite is known for its higher thermal stability and oxygen storage capacity, but catalytic activity of itself is low. A sites of the ABO3 structured perovskites were occupied by La while B sites by one of Fe, Co, Ni, and Al by citrate method. The composition of the reactant mixture was H2O/C/O2 = 8.96/1.0/1.1. The changes in the states of the catalysts after reaction were analyzed by XRD, TPD, and TGA. Ni/LaAlO3 catalyst maintained the perovskite structure after reaction. It showed higher hydrogen yield and thermal stability compared to those of the catalysts with Fe, Co, or Ni in B sites. Catalysts prepared by deposition-precipitation (DP) method showed higher activity than those prepared by impregnation method, presumably due to the smaller sizes of the NiO crystal particles.

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