Ag-Nb-Pt Bazlı SCR Katalizör Karakterizasyonu

Year 2018, Volume: 33 Issue: 4, 9 - 16, 31.12.2018

Ali Keskin , Abdulkadir Yaşar , Zeycan Keskin M. Atakan Akar İ. Aslan Reşitoğlu , Himmet Özarslan , Kadir Aydın

https://doi.org/10.21605/cukurovaummfd.521723

Abstract

Seçici Katalitik İndirgeme (SCR), dizel motorlarda NOx emisyonlarını azaltmak için kullanılan bir emisyon kontrol sistemidir. Bu çalışmada, SCR sistemi için gümüş esaslı katalizörün sentezlenmesi deneysel olarak incelenmiştir. Bu amaçla, kordiyerit (2Al2O3-5SiO2-2MgO) yapısını daldırma yöntemiyle kaplamak amacıyla gümüş nitrat (AgNO3), niyobyum (V) klorür (NbCl5) ve tetra amin platin (II) nitrat (Pt (NH3)4 (NO3)2) katalizörleri kullanılmıştır. Katalizörün kimyasal ve fiziksel özelliklerini belirlemek için XRF, SEM ve BET analizleri gerçekleştirilmiştir. Sonuçlar, kaplama malzemelerinin gözeneklerin tüm yüzeyine nüfuz ettiğini göstermiştir. Üretilen katalizör ve kordieritin BET yüzey alanlarının sırasıyla 0,2918 m2/g ve 0,4568 m2/g olduğu belirlenmiştir. Yüzey alandaki azalmanın, yüksek sinterleme sıcaklığında meydana gelen kimyasal reaksiyonlarla kristalizasyon artışına bağlı olduğu düşünülmektedir. Ayrıca, XRF analizi sonuçları, kordierit yapısındaki Ag içeriğinin %0,03 olmasına karşın katalizörde Ag, Pt ve Nb içeriğinin sırasıyla %3,67, %0,19 ve %0,12 oranlarında olduğunu ortaya koymuştur. 

Keywords

Katalizör, XRF, SEM, BET, SCR, Egzoz emisyonları

Characterization of SCR Catalyst Based Ag-Nb-Pt

Abstract

Selective Catalytic Reduction (SCR) is an emission control system used in diesel engines to reduce NOx emissions. In this study, synthesized of catalyst for SCR system was investigated as experimentally. For this purpose, silver nitrate (AgNO3), niobium (V) chloride (NbCl5) and tetra amine platinum (II) nitrate (Pt(NH3)4(NO3)2) were used to coat the cordierite (2Al2O3-5SiO2-2MgO) structure with impregnation method. X-ray Fluorescence (XRF), Scanning Electron Microscope (SEM) and Brunauer, Emmett, and Teller (BET) analyzes were carried out in order to determine the chemical and physical properties of the catalyst. Results showed that the coating materials penetrate the entire surface of the pores. It was also determined that the BET specific surface areas of the produced catalyst and cordierite are 0.2918 m2/g and 0.4568 m2/g, respectively. The reduction of surface area could be attributed to the increment of crystallization with chemical reactions occurred at the high sintering temperature. Besides, XRF analysis results demonstrated that content of Ag, Pt and Nb in the in the catalyst was found to be 3.67%, 0.19% and 0.12%, respectively, whereas Ag content in cordierite structure was 0.03%. 

Keywords

Catalyst, XRF, SEM, BET, SCR, Exhaust emissions

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