Kinetic modeling and optimization of n-heptane catalytic isomerization using Box-Behnken experimental design

Abstract

The statistical analysis using response surface methodology approach was conducted for optimization of the kinetic conditions of the n-heptane isomerization reaction over Pt-HZSM-5/HMS catalysts. The conditions of the kinetic experiments were as H2 flow rate of 20-45 cc min−1, n-C7 flow rate of 2-4.5 cc h−1, the reaction temperatures in the range of 200-350 °C, and the weight percent of HZSM-5 of 10-40. The results show that the amounts of HZSM-5 into Pt-HMS structure helps the rate of n-heptane isomerization reaction. The surface and contour plots confirm that the reaction rates do not considerably change versus temperature and flow rates of n-heptane and H2. 0.24 mol g−1s−1 is the highest reaction rate obtained in the 4.5 cc h−1 n-heptane flow rate and 45 cc min−1 H2 flow rate. The modelling results show both power-law and Langmuir–Hinshelwood model are in agreement with the experimental data.

Optimization of hexavalent chromium removal from aqueous solutions using Eichhornia crassipes-derived adsorbents through a response surface methodology

“…The outcome also suggested that the quadratic model is considered the most suitable for forecasting the response. for determining the optimal level of each variable to achieve maximum adsorption value [31,34,49].…”

“…In the given equation, Y represents the expected response, β0 represents the constant coefficient, βi represents the linear coefficient, βii represents the quadratic coefficient, βij represents the interaction coefficients, and ε represents the error of the model [34][35][36].…”