The Effect of Zeolites on the Catalytic Performance of Pt/(13X, HY & HZSM-5)-HMS Micro/Mesoporous Composites in the Selective Isomerization Process of Normal Heptane

With growing concerns about environmental pollution, the oil industry has begun to look for ways to reduce fuel pollution. Catalytic isomerization is a method in which the fuel octane number is increased without producing air pollutants. In the present work, three composite catalysts with one mesoporous silica and zeolite sections were prepared and used in the normal heptane isomerization reaction in the temperature range of 200-350 °C. The catalysts were identified using various tests such as XRD, XRF, UV-Vis DRS, nitrogen adsorption-desorption, FT-IR, NH3-TPD, and TG/DTA. The kinetics of this reaction was also investigated using two models the power law and the Langmuir-Hinshelwood. According to the obtained results, the Pt/XH catalyst showed the highest reaction yield (23.9%) and selectivity to isomerization products (51.8%) and the Langmuir-Hinshelwood model presented the best correlation (more than 0.9) with the experimental data.