Selective catalytic reduction of NO by propylene over bifunctional and bimetallic material type Pt-Pd/ZSM-5

Articles in Press

Document Type : Research Article

Authors

1 Department of hydrocarbons and renewable energies, Faculty of Science and Technology. University of Adrar

2 Department of chemistry, Faculty of Science and Technology, University of Adrar

3 Department of Chemistry, University of Mostaganem

4 Research center in industrial technologies CRTI, Cheraga6 Algiers

5 Research center in industrial technologies CRTI, Cheraga ?Algiers

10.30492/ijcce.2024.2016419.6332

Abstract

Bi-functional and bi-metallic ZSM-5 catalysts with different noble metal mass ratios were prepared using the deposition-precipitation method and ionic exchange with NH4+. Systemic XRD, BET/BJH, STEM, and XPS spectroscopy investigations of the structural and electronic properties of these catalysts showed that 2⁓3-nm Pt and Pd metallic nanoparticles were highly dispersed over the ZSM-5 support, with strong interactions between Platinum and Palladium, and a good distribution of the acid sites on the surface of the catalysts which have been observed using the FTIR method by adsorption of pyridine. Considering optimized values of NO/C3H6 ratio=1 and GHSV= 22000 h-1, some parameters, acidity, temperature, surface morphology, and catalytic activity performance of Pd-Pt/HZSM-5 zeolites were investigated in the selective catalytic reduction of NO by C3H6, Pd-Pt/HZSM-5 bi-functional catalysts exhibited improved catalytic properties relative to their monometallic counterparts. The results show that the active components are uniformly dispersed and distribute well in the micro-porous support. For the Pt0.6Pd0.4/HZSM-5 catalyst, the maximum conversion of NO to N2 approached 63% at 450 ºC with 100% N2 selectivity. By contrast, for the 1%Pt/HZSM-5 catalyst, the maximum NO conversion to N2 reached 52% at 450 ºC and only 42% for 1%Pt/HZSM-5. The Pt0.6Pd0.4/ZSM-5 catalyst also exhibited high durability and catalytic activity at high reaction temperatures.

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Iranian Journal of Chemistry and Chemical Engineering

Articles in Press, Accepted Manuscript
Available Online from 19 March 2024

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