Preparation, Characterization and Catalytic Testing over Bimetallic Pt-Pd/HZSM-5 Catalysts in NO Reduction by Propylene
نویسندگان
1 Laboratory of Catalytic Materials and Industrial Processes (LMPCI) Department of Hydrocarbos and Renewable Energies, Faculty of Science and Technology. University of Adrar, National Highway No. 06. Adrar 01000, ALGERIA
2 Department of Chemistry, Faculty of Science and Technology, University of Adrar, National Highway No. 06. Adrar 01000, ALGERIA
3 Laboratory of Catalytic Materials and Industrial Processes (LMPCI) Department of Hydrocarbons and Renewable Energies, Faculty of Science and Technology. University of Adrar, National Highway No. 06. Adrar 01000, ALGERIA
4 Laboratory of Catalytic Materials and Industrial Processes (LMPCI) Department of Hydrocarbons and Renewable Energies, Faculty of Science and Technology. University of Adrar, National Highway No. 06. Adrar 01000, ALGERIA
5 Environmental Research Center (C.R.E), Alzone 23000 Annaba, ALGERIA
6 Department of Chemistry, Faculty of Science and Technology, University of Adrar, National Highway No. 06. Adrar 01000, ALGERIA
7 Department of Chemistry, University of Mostaganem, B.P 1001, 27000 Mostaganem, ALGERIA
8 Research Center in Industrial Technologies CRTI, Cheraga 16014, Algiers, ALGERIA
doi
10.30492/ijcce.2024.2016419.6332چکیده
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.
