Iranian Journal of Catalysis (IJC) CO Hydrogenation over functionalized AlMCM-41 materials and ZSM-11/5 zeolites as catalysts Volume 12 (2022) IJC Issue 3, September 2022 2023 12 24 CO Hydrogenation over functionalized AlMCM-41 materials and ZSM-11/5 zeolites as catalysts 10.30495/ijc.2022.1956221.1928 EN B. Smili Laboratory of Energy Environment and Information System (LEEIS), Department of Material Sciences, Faculty of Sciences and Technology, University of Adrar, National Highway No. 06. Adrar 01000, Algeria. 0000-0001-9338-6149 M. Sakmeche Laboratory of Saharan natural resources (LRNS), Department of hydrocarbons and renewable energies, Faculty of Science and Technology. University of Adrar, National High way No. 06. Adrar 01000, Algeria. 0000-0003-0859-9700 A. Belhakem Department of Chemistry, University of Mostaganem, B.P 1001, 27000 Mostaganem, Algeria L. Belgacem Research center in industrial technologies CRTI, Cheraga 16014, Algiers, Algeria C. Tabti Department of Chemistry, University of Mostaganem, B.P 1001, 27000 Mostaganem, Algeria Journal Article 2023 12 24 We studied the reaction in which carbon monoxide is converted to hydrocarbons, and investigated the behaviors and the combination system of catalysts exchanged with platinum and ammonium ions. Experiments were conducted at 1.2 MPa, 523K, and CO/H2=1 ratio. The structure and the texture of the catalysts, assessed by XRD, BET/BJH, and SEM, exhibited a microporosity for ZSM-5/11 and a micro/mesoporosity for AlMCM-41, which implies a direct effect on the catalytic properties of these materials. The conversions obtained were 60%, 55%, and 50% for Ptn+/H+-catalysts, Ptn+-catalysts, and H+-catalysts respectively. Such conversions could be attributed to the good acidity resulting from the simultaneous presence of Ptn+/H+ at different oxidation states of platinum, which was revealed by XANES PtLIII analysis, and their uniform dispersion within the inner surface and its grain size average conducted by the titration of adsorbed H2-O2. FTIR analysis showed a better distribution of acid sites for bi-exchanged catalysts over mono-exchanged ones, which resulted in a good catalytic activity. These results suggest a strong correlation between the high selectivity of light hydrocarbon products, the ions, and the catalyst types. These differences depended mainly on the facility of forming different products, such as n/iso-alkanes and alkenes. Skeletal isomerization was the main transformation observed on exchanged catalysts, particularly those with Ptn+/H+ ions. A deactivation process of catalysts, versus time-on-stream, begins after 70 minutes, especially for combined exchanged materials.   Highlights CO conversion over Ptn+/H+-catalysts is a good process for obtaining light products. Behaviours of AlMCM-41, ZSM-(5and11) functionalized as bi-functional catalysts. Good acidities due to the presence of Ptn+/H+ ions in surface of catalysts. XANES PtLIII and titration H2-O2 are good techniques for characterization of Pt spices. Ptn+/H+-catalyst have a good catalytic performances than H+-catalyst.