Effect of the Preparation Method of LaSrCoFeOx Perovskites on the Activity of N2O Decomposition

Abstract

N2O remains a major greenhouse gas and contributor to global warming, therefore developing a catalyst that can decompose N2O at low temperatures is of global importance. We have investigated the use of LaSrCoFeOx perovskites for N2O decomposition and the effect of surface area, A and B site elements, Co–O bond strength, redox capabilities and oxygen mobility have been studied. It was found that by using a citric acid preparation method, perovskites with strong redox capabilities and weak Co–O bonds can be formed at relatively low calcination temperatures (550 °C) resulting in highly active catalysts. The enhanced activity is related to the presence of highly mobile oxygen species. Oxygen recombination on the catalyst surface is understood to be a prominent rate limiting step for N2O decomposition. Here the reduced strength of Co–O bonds and mobile lattice oxygen species suggest that the surface oxygen species have enhanced mobility, aiding recombination, and subsequent regeneration of the active sites. La0.75Sr0.25Co0.81Fe0.19Ox prepared by citric acid method converted 50% of the N2O in the feed (T50) at 448 °C. Graphic Abstract

Exploration of bismuth-based materials for photocatalytic decomposition of N2O

“…36 Therefore, it is expected that the oxygen vacancy sites at the surface of CBO and BCO can bind with the oxygen of N 2 O and initiate the decomposition of N 2 O as described in eqn ( 4) and ( 5). 55 The pictorial representation of the plausible mechanism is provided in Fig. 7.…”

La-Doped Alumina, Lanthanum Aluminate, Lanthanum Hexaaluminate, and Related Compounds: A Review Covering Synthesis, Structure, and Practical Importance

“…The application in thermal barrier coatings was also considered, whereby layered perovskites of so-called Ruddlesden–Popper structure have an exceptional low thermal conductivity . Chemical, − combustion-, ,− environmental, , , − photo-, , and electrocatalysis − are other areas of potential use. , , − Electrocatalysis includes high-temperature solid-oxide electrolysis cells and water splitting. − Photocatalysis includes water splitting ,− and CO 2 conversions . Emery et al performed a computational screening of perovskites for the solar-driven thermochemical splitting of water, resulting in 139 promising candidates.…”

Tuning the A‐site Element in LaCo0.8Fe0.2O3 Perovskite‐based Catalyst for High Temperature N2O Decomposition in Nitric Acid Plant

“…Umicore also developed various perovskite‐based formulations [19] . Recently, hydrothermal microwave‐synthesized LaFeO 3 catalyst [9b] and La 0.75 Sr 0.25 CoO x , SrCo 0.81 Fe 0.19 O x and their mixture have also been investigated for N2O decomposition [20] . However, it should be mentioned that most of those studies were carried out under moderate conditions where steam and NO x content in the reaction mixture is far away from the real exhaust gas.…”