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Optimizing reaction conditions and experimental studies of selective catalytic reduction of NO by CO over supported SBA-15 catalyst

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Abstract

Selective catalytic reduction of NO with CO (CO-SCR) was investigated based on optimizing the operating conditions by response surface methodology (RSM) and by appropriately choosing the supported SBA-15 catalysts. The effects of the CO-SCR reaction parameters such as NO:CO molar ratios and oxygen concentrations on the catalytic performance were determined by RSM to evaluate the NO conversion using a first-order polynomial model. The CuO/SBA-15 and Fe2O3/SBA-15 catalysts were synthesized by a hydrothermal method and characterized by X-ray diffraction (XRD), atomic absorption spectroscopy (AAS), N2 adsorption-desorption (BET), scanning electron microscopy coupled to energy dispersive X-Ray spectroscopy (SEM-EDS), and Fourier transform infrared spectroscopy (FTIR) to investigate the physicochemical properties of the solids. The RSM showed a very good agreement between predicted values and experimental results with the Pareto analysis confirming the accuracy and reliability of the model. The optimized results indicated the maximum NO conversion at 500 °C with using the NO to CO molar ratio of 1:2 (500:1000 ppm) in the absence of oxygen. Under these conditions, CuO/SBA-15 catalyst achieved 99.7% of NO conversion, whereas Fe2O3/SBA-15 had 98.1% of the catalytic parameter. Catalytic tests in CO-SCR reaction were performed on both catalysts at optimum operating conditions with CuO/SBA-15 exhibiting better performance compared to that of Fe2O3/SBA-15. The results revealed that CuO/SBA-15 was a promising catalyst for CO-SCR of NO due to the well-dispersed CuO phase on SBA-15 surface that allows the solid being more tolerant to the presence of oxygen.

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Acknowledgments

The CAPES is grateful to the M.S. scholarship. The facilities of LAPEMOL from UFRN are acknowledged by XRD measurements. The authors wish to thankfully acknowledge the Central Analítica da UFC for SEM-EDS images and CETENE for the textural properties analysis data.

Funding

We would like to thank CNPq (grant no. 406629/2018-8) for the financial support.

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Authors and Affiliations

  1. Campus do Itaperi, Centro de Ciências e Tecnologia, Universidade Estadual do Ceará, Fortaleza, Ceará, Brazil

    Monique S. Souza & Rinaldo S. Araújo

  2. Departamento de Química e Meio Ambiente, Instituto Federal de Educação, Fortaleza, Ceará, Brazil

    Rinaldo S. Araújo

  3. Campus do Pici - Bloco 940, Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, Fortaleza, Ceará, Brazil

    Alcineia C. Oliveira

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  1. Monique S. Souza
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  2. Rinaldo S. Araújo
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  3. Alcineia C. Oliveira
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Correspondence to Rinaldo S. Araújo.

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Souza, M.S., Araújo, R.S. & Oliveira, A.C. Optimizing reaction conditions and experimental studies of selective catalytic reduction of NO by CO over supported SBA-15 catalyst. Environ Sci Pollut Res 27, 30649–30660 (2020). https://doi.org/10.1007/s11356-020-09391-y

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