Results in Engineering (Dec 2024)
The effect of HZSM-5, HY, and TiO2 on the n-heptane selective isomerization of Pt/MCM-48 catalyst: Optimal experimental design and kinetic study
Abstract
This study presents a comprehensive kinetic investigation of n-heptane isomerization over micro/mesoporous Pt/MCM-48-(HZSM-5, HY, and TiO2) composite catalysts in the presence of hydrogen. Employing Response Surface Methodology with Central Composite Design (RSM-CCD), the effects of temperature, hydrogen flow rate, n-heptane flow rate, and contact time were examined on the reaction rate. The findings reveal optimal conditions for Pt/MCM-48-HZSM-5 catalyst at 200 °C, 1-hour contact time, high H2 flow rate (45 ml min−1), and high n-C7 flow rate (4.5 ml h−1), resulting in a reaction rate of 0.154 mol g−1 s−1. Mathematical modeling using both power law and Langmuir-Hinshelwood approaches yielded activation energies ranging from 5.71 to 54.24 kJ mol−1 and 5.79 to 18.66 kJ mol−1, respectively. These findings provide valuable insights into the complex interplay of reaction parameters and offer guidance for optimizing n-heptane isomerization processes over composite catalysts.
