CATALYTIC REMOVAL OF NOX BY CEO2-MNOX SOLID SOLUTION CATALYSTS

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MOUSAVI SEYED MAHDI; Salari Dariush; NIAEI ALIGHOLI; Nakhostin Panahi Parvaneh

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Seminar: SEMINAR OF CHEMISTRY AND ENVIRONMENT
Year:2013 | Issue:6

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Title

CATALYTIC REMOVAL OF NOX BY CEO2-MNOX SOLID SOLUTION CATALYSTS

Author(s)

MOUSAVI SEYED MAHDI | Salari Dariush | NIAEI ALIGHOLI | Nakhostin Panahi Parvaneh | Issue Writer Certificate

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Abstract

NITROGEN OXIDES (NOX), PRODUCED BY COMBUSTION OF FOSSIL FUELS AT HIGH TEMPERATURES, HAVE CAUSED A VARIOUS HUMAN AND ENVIRONMENT PROBLEMS [1]. THEREFORE GREAT EFFORTS OF RESEARCHERS HAVE BEEN ATTRACTED TO LIMIT THE EMISSION OF NOX POLLUTANTS [2]. CATALYTIC REDUCTION OF NOX WITH AMMONIA IS A WELL-PROVEN AND EFFECTIVE TECHNOLOGY TO NOX CONTROL. IN THIS PROCESS, AMMONIA HAS BEEN EMPLOYED AS REDUCTANT WHICH CONVERTS NO INTO N2, N2O AND H2O VIA CATALYTIC REACTIONS [3]. IN THE PAST FEW DECADES, VARIOUS METAL OXIDES CONTAINING CATALYSTS (SUPPORTED, UNSUPPORTED AND/OR THEIR MIXED OXIDES) ARE BEING DEVELOPED IN CATALYTIC REDUCTION OF NOX [3-4].IN PRESENT STUDY, CEO2-MNOX SOLID SOLUTION CATALYSTS WITH DIFFERENT MN/(MN+CE) MOLAR RATIO (0, 0.25, 0.5, 0.75 AND 1) ARE PREPARED BY SOL-GEL METHOD. IN THE SYNTHESIS, CITRIC ACID IS USED AS THE COMPLEXATION AGENT WITH THE EQUIMOLAR OF TOTAL METAL IONS. THE GEL DECOMPOSITION ARE CARRIED OUT UNDER CONTROLLED CONDITION (HEATING AT 300 °C FOR 1 H) SO THAT GEL DECOMPOSED BY SELF-IGNITED COMBUSTION [5]. X-RAY DIFFRACTION (XRD), TEMPERATURE PROGRAMMED REDUCTION (H2-TPR) AND N2-ADSORPTION (BET) ANALYSES ARE CONDUCTED TO CHARACTERIZE THE PHYSICAL-CHEMICAL PROPERTIES OF THE CATALYSTS. THE XRD DIFFRACTO GRAMS OF CATALYSTS WITH MN/(MN+CE) MOLAR RATIO 0.25, 0.5, 0.75 SHOWED DIFFRACTION PEAKS ATTRIBUTED TO CUBIC FLUORITE STRUCTURE OF CEO2 (JCPDS #34-0394) AND NO DIFFRACTION PEAKS RELATED TO MN PHASES WERE RECOGNIZED. THE XRD RESULTS REPRESENT THAT MN ATOMS CAN BEEN REPLACED INSTEAD OF SOME CE SITES IN THE CEO2 LATTICE TO FORM A SOLID SOLUTION CATALYST. FURTHERMORE, IT IS PROBABLE THAT THE NANO SIZED MNOX PHASES HAVE BEEN FORMED BESIDE THE CEO2 LATTICE TO PRODUCE A NANO COMPOSITE CATALYST. H2-TPR ANALYSIS CONFIRMED ADDITION OF MN SPECIES INTO CEO2, LEADS TO SHIFT THE REDUCTION TEMPERATURES TO LOWER TEMPERATURES. IT SUGGESTS THAT THERE IS A STRONG INTERACTION OR SYNERGISTIC EFFECTS BETWEEN THE CE AND MN SPECIES.THE ACTIVITY OF PREPARED SOLID SOLUTION CATALYSTS IS EVALUATED IN CATALYTIC REMOVAL OF NOX WITH AMMONIA IN A GAS HOURLY SPACE VELOCITY (GHSV) OF 12000 H-1. IT WAS FOUND THAT THE CATALYTIC PERFORMANCE OF CEO2-MNOX MIXED OXIDES WAS STRONGLY INFLUENCED BY THE MOLAR RATIO OF MN. THE CEO2-MNOX (0.25) EXHIBITED HIGHEST CATALYTIC ACTIVITY AT LOW TEMPERATURE OF 200 °C (83% NO CONVERSION AND 68% N2 YIELD). IT CAN ASCRIBE TO PRESENCE OF WELL DISPERSED EASILY REDUCIBLE SITES OF MN4+ AND MN3+ AND SYNERGISTIC EFFECT BETWEEN CE AND MN THAT ARE APPROVED BY XRD AND H2-TPR RESULTS.

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APA: Copy

MOUSAVI, SEYED MAHDI, Salari, Dariush, NIAEI, ALIGHOLI, & Nakhostin Panahi, Parvaneh. (2013). CATALYTIC REMOVAL OF NO_X BY CEO₂-MNO_X SOLID SOLUTION CATALYSTS. SEMINAR OF CHEMISTRY AND ENVIRONMENT. SID. https://sid.ir/paper/916225/en

Vancouver: Copy

MOUSAVI SEYED MAHDI, Salari Dariush, NIAEI ALIGHOLI, Nakhostin Panahi Parvaneh. CATALYTIC REMOVAL OF NO_X BY CEO₂-MNO_X SOLID SOLUTION CATALYSTS. 2013. Available from: https://sid.ir/paper/916225/en

IEEE: Copy

SEYED MAHDI MOUSAVI, Dariush Salari, ALIGHOLI NIAEI, and Parvaneh Nakhostin Panahi, “CATALYTIC REMOVAL OF NO_X BY CEO₂-MNO_X SOLID SOLUTION CATALYSTS,” presented at the SEMINAR OF CHEMISTRY AND ENVIRONMENT. 2013, [Online]. Available: https://sid.ir/paper/916225/en

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