Catalyst pellet design for propylene self-metathesis was investigated. WO3/Si-Al and hydrotalcite were selected as the catalyst and binder, respectively. The reaction kinetics and mathematical models of catalyst pellet with Knudsen diffusion and one-dimensional axial dispersion reactor were developed and simulated using gPROMS to investigate the performance of propylene self-metathesis over the catalyst pellet. A sensitivity analysis of various operating conditions and parameters such as catalyst pore size and pellet size was performed to determine optimal pellet diameter and pore size to maximize the combined yield of ethylene and butenes at minimal C5+ yield. Simulation results revealed optimal catalysts with pellet diameter and pore size ranging from 0.14-5.3 mm and 42-132 angstrom, respectively depending on operating conditions.