Synthesis, characterization and catalytic activity of partially substituted La1−xBaxCoO3 (x ≥ 0.1 ≤ 0.4) nano catalysts for potential soot oxidation in diesel particulate filters in diesel engines

Abstract

The sol gel method was used in preparing a series of A site partially substituted La1−xBaxCoO3 (x ≥ 0.1 ≤ 0.4) perovskite catalysts coded LBC1, 2, 3, and 4 and their potential as catalysts for soot oxidation were evaluated. The Brunauer–Emmett–Teller (BET), Inductively Coupled Plasma Atomic Emission Spectroscopy (ICPAES), Thermogravimetric/Differential Thermal Analysis (TGA/DTG), X-ray analysis (XRD) were used in characterizing the prepared perovskite catalyst. The result shows that at (x≥ 0.2 ≤ 0.4), there was an increase in surface area when we compare it with that of x = 0. The increase in surface area helps in increasing the catalytic performance of the catalyst. Also, when evaluating the catalytic performance of the synthesized catalysts, it was observed that doping the perovskite catalysts helped in the general improvement of the catalytic performance for soot oxidation. The best performance in this research study with a T50 of 484 °C was observed at x = 0.2 catalyst (LBC2). This shows that the non-noble perovskite catalysts prepared in this research study has the potential to replace the noble metal based catalysts used presently in the diesel automotive industry.

Improving the Catalytic Performance of BaMn0.7Cu0.3O3 Perovskite for CO Oxidation in Simulated Cars Exhaust Conditions by Partial Substitution of Ba

“…After doping with A-metal, the BET surface area increased from 3 m 2 /g to 6 for BMC and to 7 m 2 /g for BMC-Ce and BMC-La, respectively. The very low surface areas are consistent with the expected for solids with a very low porosity development, as mixed oxides with perovskite structure are [6,16,24], and they were likely due to the relatively high calcination temperature used (850 • C) [25,26], as this temperature determines the ultimate physical and chemical properties of solids.…”

Ba0.9A0.1MnO3 (A = Ce, La, Mg) Perovskite-Type Mixed Oxides: Effect of Partial Substitution of Ba on the Catalytic Performance for the Oxidation of CO in Simulated Automobile Exhaust Conditions

“…The doping of BaMnO 3 with Ce, La, or Mg leads to an increase in the specific surface area but, as expected for perovskite-type mixed oxides, very low values were obtained for all samples due to the almost undeveloped porosity. According to K. Akinlolu et al [36], the very low porosity development is a consequence of the calcination temperature (850 • C) used in the synthesis. The ICP-OES data showed that the sol-gel process allowed the addition of the required percentage of dopants (Ce, La, or Mg).…”

Screening Ba0.9A0.1MnO3 and Ba0.9A0.1Mn0.7Cu0.3O3 (A = Mg, Ca, Sr, Ce, La) Sol-Gel Synthesised Perovskites as GPF Catalysts

“…The nomenclature for the mixed oxides is shown in Table 1, along with the specific surface area values (obtained by applying the Brunauer-Emmett-Teller (BET) equation to N 2 adsorption data), the A metal content (determined by ICP-OES), and some XRD data. The low surface areas presented in Table 1 suggest, as expected for perovskite-type mixed oxides [10], that all samples present low specific surface areas and extremely small porosity development that, according to K. Akinlolu [35], could be a consequence of the calcination conditions used in the synthesis (850 • C). Note that the calcination temperature used for synthesis was the minimum one needed to obtain the perovskite phase [36] because, if higher temperatures were used, larger crystal sizes would be obtained, thus promoting a decrease in the number of active sites [37].…”