Catalytic oxidation of toluene over LaBO3 (B= Fe, Mn and Co) and LaCo0.7B′0.3O3 (B′= Fe and Mn) perovskite-type

Document Type: Full article

Authors

1 Department of Applied Chemistry, University of Tabriz, Tabriz, Iran

2 Department of Chemical & Petroleum Engineering, University of Tabriz, Tabriz, Iran

Abstract

In this paper, LaBO3 perovskite type catalyst formulations were prepared by sol-gel auto combustion method using citric acid as the fuel. Activity of catalysts was tested in catalytic oxidation of toluene as a model of volatile organic compounds. LaCoO3 perovskite formulation showed the highest activity among LaBO3 (Fe, Mn and Co) perovskite catalysts. So, LaCoO3 perovskite based catalyst was selected for further investigation and modification in order to improve catalytic activity. LaBO3 perovskite catalysts were modified by substitution of Co by Fe and Mn. The catalytic activity of LaCoO3 improved due to partial substitution of Co by Fe and Mn cations. LaCo0.7Mn0.3O3 showed the highest catalytic activity among the synthesized catalysts. The structures and morphology of synthesized perovskites were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis. The results of X-ray diffraction indicated that the LaBO3 and LaCo0.7B′0.3O3 samples obtained using sol-gel method had a pure perovskite-type crystal structure.

Keywords


[1]   Soleimanzadeh, A., Niaei, A., Salari, D., Mousavi, S. M. and Tarjamannejad, A., “Performance study of V2O5/TiO2 mixed metal oxide nanocatalysts in selective catalytic reduction of Nox prepared by co-precipitation method”, Proc. Mat. Sci., 11, 655 (2015).

[2]   Hosseini, S. A., Niaei, A., Salari, D., Alvarez-Galvan, A. C. and Fierro, J. L. G., “Study of correlation between activity and structural properties of Cu-(Cr, Mn and Co)2 nano mixed oxides in VOC combustion”, Ceram. Int., 40 (4), 6157 (2014).

[3]   Izadkhah, B., Nabavi, S. R., Niaei, A., Salari, D., Mahmoudi Badiki, T. and Caylak, N., “Design and optimization of Bi-metallic Ag-ZSM5 catalysts for catalytic oxidation of volatile organic compounds”, J.  Ind. Eng. Chem., 18 (6), 2083 (2012).

[4]   Masui, T., Imadzu, H., Matsuyama, N. and Imanaka, N., “Total oxidation of toluene on Pt/CeO2–ZrO2–Bi2O3/γ-Al2O3 catalysts prepared in the presence of polyvinyl pyrrolidone”, J. Hazard. Mat., 176 (1), 1106 (2010).

[5]   Santos, V. P., Carabineiro, S. A. C. and Figueiredo J. L., “Oxidation of CO, ethanol and toluene over TiO2 supported noble metal catalyst”,  App. Catal., B: Environ., 99 (1), 198 (2010).

[6]   Hosseini, S. A., Salari, D., Niaei, A. and Oskoui, S. A., “Physical–chemical property and activity evaluation of LaB0.5Co0.5O3 (B=Cr, Mn, Cu) and LaMnxCo1−xO3 (x=0.1, 0.25, 0.5) nano Perovskites in VOC combustion”, J. Ind. Eng. Chem., 19 (6), 1903 (2013).

[7]   He, H., Dai, H. and Au, C., “An investigation on the utilization of perovskite-type oxides La1−xSrxMO3 (M=Co0.77Bi0.20Pd0.03) as three-way catalysts”,  App. Catal., B: Environ., 33 (1), 65 (2001).

[8]    Izadkhah, B., Niaei, A., Salari, D., Hosseinpoor, S., Hosseini, S. A. and Tarjomannejad, A., “ Catalytic removal of CO and NOx using sol-gel synthesized LaB0. 5Co0. 5O3 (B=Cr, Mn and Cu) and LaMnxCo1-xO3 nano-Perovskites”, Korean J. Chem. Eng., 33 (4), 1192 (2015).

[9]   Oskoui, S. A., Niaei, A., Tseng, H. H., Salari, D., Izadkhah, B. and Hosseini, S. A., “Modeling preparation condition and composition–activity relationship of Perovskite-type LaxSr1–xFeyCo1–yO3 nano catalyst”, ACS Comb. Sci., 15 (12), 609 (2013).

[10]           Leontiou, A., Ladavos, A. and Pomonis, P., “Catalytic NO reduction with CO on La1−xSrx(Fe3+/Fe4+)O3±δ Perovskite-type mixed oxides (x=0.00, 0.15, 0.30, 0.40, 0.60, 0.70, 0.80, and 0.90)”, App. Catal., A: Gen., 241 (1-2), 133 (2003).

[11] Niu, J., Deng, J., Liu, W., Lei, Z., Wang, G., Dai, H., He, H. and Zi, X., “Nanosized Perovskite-type oxides La1−xSrxMO3− δ (M=Co, Mn; x=0, 0.4) for the catalytic removal of ethylacetat”, Catal. Today, 126 (3), 420 (2007).

[12] Huang, H., Liu, Y., Tang, W. and Chen, Y., “Catalytic activity of nanometer La1−xSrxCoO3 (x=0, 0.2) Perovskites towards VOCs combustion”, Catal. Commun., 9 (1), 55 (2008).

[13]           Levasseur, B. and Kaliaguine, S., “Effects of iron and cerium in La1−yCeyCo1−xFexO3 Perovskites as catalysts for VOC oxidation”,  App. Catal., B: Environ., 88 (3),  305 (2009).

[14] Rousseau, S., Loridant, S., Delichere, P., Boreave, A., Deloume, J. P. and Vernoux, P., “La(1−x)SrxCo1−yFeyO3 Perovskites prepared by sol–gel method: Characterization and relationships with catalytic properties for total oxidation of toluene”, App. Catal., B: Environ., 88 (3), 438 (2009).

[15] Liu, G., Li, J., Yang, K., Tang, W., Liu, H., Yang, J., Yue, R. and Chen, Y., “Effects of cerium incorporation on the catalytic oxidation of benzene over flame-made Perovskite La1−xCexMnO3 catalysts”, Particuology, 19, 60 (2015).