Lanthanum chromite based perovskites for oxygen transport membrane

Abstract

Judicious selection of mixed ionic-electronic conducting (MIEC) perovskite oxide as oxygen transport membrane (OTM) offers the potential to enhance overall process economics and systems performance for a wide variety of industrial applications ranging from clean and efficient energy conversion (oxy-combustion) to selective gas separation (high purity oxygen production) and value added chemicals (syngas and liquid fuel) production with near-zero greenhouse gas emissions. Doped lanthanum chromite perovskites have been considered as promising material of choice for oxygen transport membrane (OTM) due to their superior thermo-chemical stability in aggressive environment (800-1000°C, 0.21-10-20) than the other mixed ionic-electronic conducting (MIEC) perovskites such as ferrites and cobaltite's. Thermo-physical properties of the lanthanum chromite, required for optimum oxygen transport can be tuned by modifying the crystal structure, chemical

High‐Temperature Electrical Conductivity of LaCr1−xCoxO3 Ceramics

“…An overview of the effect of doping on the material properties of LaCrO 3 ‐based ceramics is given by Gupta et. al …”

Comparative study for low temperature water-gas shift reaction on Pt/ceria catalysts: Role of different ceria supports

“…In this way ceria can be reduced (Ce +3 ) or oxidized (Ce +4 ) in fuel rich and lean conditions respectively [11,14,30]. WGS reaction activity is strongly dependent upon the structure of the ceria support and the nature of the interaction between the metal/metal oxide and the support [31].…”

Exploring the Processing of Tubular Chromite- and Zirconia-Based Oxygen Transport Membranes

“…The volatility of chromium in LaCrO 3 at high temperatures is a well-known challenge [12]. Since a high sintering temperature (≥1425 • C) was required to densify the composite membrane in our work, it is not surprising that we also encountered loss of Cr from the outer membrane part.…”

“…There are no previous reports on the TEC of the specific LCCN composition. The TEC of LaCrO 3 (4.6 × 10 −6 K −1 in the range 40-275 • C, 9.4 × 10 −6 K −1 in the range 290-1050 • C, and 9.8 × 10 −6 K −1 in the range 1100-1395 • C) [37,38] can be adjusted by doping to be similar to fluorite structured materials like zirconia [12]. Ni is expected to slightly decrease the TEC of LaCrO 3 , and Cu is not expected to increase it as much as elements with spin transitions such as Co [39].…”

“…Lanthanum-based perovskite-structured oxides with, e.g., Cr, Fe, and Sr are common choices for the electronic conductor. LaCrO 3 is difficult to sinter due to the high volatility of Cr, but it possesses excellent stability over a wide pO 2 range (0.21-10 −22 atm) and can, upon acceptor doping, reach high electronic conductivity [12]. The composition LaCr 0.85 Cu 0.10 Ni 0.05 O 3−δ (LCCN) was recently shown to reach 11.4 S cm −1 at 800 • C and have excellent stability in a wide pO 2 range [13].…”