CO oxidation on perovskite-type LaCoO3 synthesized using ethylene glycol and citric acid

Abstract

In order to synthesize perovskite-type LaCoO 3 with good surface crystallinity, the gel prepared by adding both ethylene glycol (EG) and citric acid (CA) to the aqueous solution of La(NO 3 ) 3 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O was fired at 600°C in air for 3 hours. The transmission electron microscopy (TEM) observation indicated that the particles of LaCoO 3 tended to have a uniform shape at EG/CA = 4. Although the specific surface area of LaCoO 3 synthesized using both EG and CA was slightly smaller than that of LaCoO 3 synthesized using only CA, the catalytic activity of CO oxidation became higher by adding EG.

Aerobic selective oxidation of alcohols using La1−Ce CoO3 perovskite catalysts

“…S1A of the SI), showing that the use of suitable complexing agents and metal ions is important for the formation of perovskite-type oxides. The effects of complexing agents and metal ions on the formation of perovskites have been widely reported in literature [23,27]. However, to the best of our knowledge, the calcination temperature of 600°C used in this work is the lowest ever reported for the preparation of perovskites by a sol-gel method.…”

CO sensing mechanism of LaCoO3

“…Oxygen ions in LaCoO 3 diffuse via a vacancy mechanism [42,43]. More importantly, the temperature corresponding to the 50% conversion of CO to CO 2 by LaCoO 3 is around 200°C [44][45][46]. Therefore, LaCoO 3 is very promising for the CO sensing at low temperatures.…”

Preparation of Highly Active and Stable Perovskite-like Catalyst by Combustion Method: Effect of Complex

“…[3], which offer the possibility of studying the relationship between structure properties and catalytic performances [4], and hence comprehending the reaction nature. As a result, these oxides are widely applied in catalysis as catalyst of, such as, CO oxidation [5,6], NO reduction [7,8], CH 4 combustion [9][10][11], etc.…”

“…On the other hand, in order to tune the catalytic performance of catalyst, the way used in the literatures mostly is through the substitution of A-or B-site cation with a foreign one [16][17][18][19][20] or by a different preparation methods [21]. Few works [5] regarding the effect of complex (in combustion method) on the catalytic performance has been reported, especially no reason and sound explanation for (1) why citric acid is used as the complex and (2) how much citric acid should be used, is normally given. Hence, the objective of this work is to investigate the effect of complex on the catalytic performance of perovskite-type catalyst synthesized by combustion method, and subsequently to optimize the complex and its amount that are best for the synthesis of highly active perovskite-type catalyst.…”