Abstract
Recently, lanthanum oxide doped by group IIA elements may strongly influence solid state reaction. A series of samples, noted LaSrX (where X = % atomic of strontium) have been prepared by hydrolysis, in neutral medium from La2O3 and SrCO3. These samples were calcined under air at 450?C and 1150?C then characterized by specific surface area (BET), X-ray diffraction, scanning electron microscopy (SEM), thermogravimetry (TG) and differential thermal analysis (DTA). Obtained results show that after calcinations at: 1) 450?C, the addition of strontium is without effect on surface of La2O3 and the XRD analysis revealed no interaction between lanthanum oxide and strontium carbonate; 2) 1150?C, the sintering of the samples is very important, reduction of 70% of surfaces compared to the samples calcined at 450?C; XRD results show that LaSrX are formed principally by two oxides: SrLa2O4 and La2O3, which is confirmed by SEM method. The reaction between La2O3 and SrCO3 showed three endothermic weight losses; elimination of water, a partial dehydroxylation of La(OH)3 and formation of La2O2CO3 and La2(CO3)3.
Highlights
The literatures [1,2,3,4,5] show that the rare earth oxides (REO) are very interesting in the conversion of greenhouse gases; the valorisation of methane by direct oxidation or dry reforming and the reduction of nitrogen oxides
Obtained results show that after calcinations at: 1) 450 ̊C, the addition of strontium is without effect on surface of La2O3 and the X-Rays Diffraction (XRD) analysis revealed no interaction between lanthanum oxide and strontium carbonate; 2) 1150 ̊C, the sintering of the samples is very important, reduction of 70% of surfaces compared to the samples calcined at 450 ̊C; XRD results show that LaSrX are formed principally by two oxides: SrLa2O4 and La2O3, which is confirmed by Scanning Electron Microscopy (SEM) method
We are interested in the effect of the elements of the group IIA on the REO; in this paper we reported the results of a study on the effect of strontium on La2O3
Summary
The literatures [1,2,3,4,5] show that the rare earth oxides (REO) are very interesting in the conversion of greenhouse gases; the valorisation of methane by direct oxidation or dry reforming and the reduction of nitrogen oxides. The ceria and lanthanum oxides are the most used and studied in catalysis. The literatures show that these oxides suffer significant damage under the reactions conditions: lower activities, reduction in surfaces. We showed that the barium stabilizes La2O3 by its interaction and insertion [6]. We are interested in the effect of the elements of the group IIA on the REO; in this paper we reported the results of a study on the effect of strontium on La2O3
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