Commercialized silicoaluminophosphate-34 (SAPO-34) zeolite was successfully blended in the polyethersulfone (PES) polymer to prepare the mixed matrix membranes (MMMs). The CO₂ permeability and CO_2/CH₄ ideal selectivity of 30 wt% SAPO-34/PES MMM at 0.1 MPa and 35 °C were 15 barrer and 51, respectively. In our previous paper, the PES MMMs using laboratory-made SAPO-34 provided both higher permeability and selectivity than the neat PES membrane. The performance of the commercial SAPO-34 filled MMMs in this study exceeded their performance. We also investigated the performance of these MMMs in terms of gas diffusivity and solubility. The increase in the diffusivity selectivity was greater for the commercial SAPO-34 MMMs than for the laboratory-made SAPO-34 MMMs. The difference was attributed to the amounts of defects. The performance of the MMMs in this study was also superior to that of the reported SAPO-34/PES MMMs in literature where the filler surface was modified to improve the compatibility of the filler and PES matrix. These results suggest that the use of the commercial SAPO-34 and an appropriate surface modification has the potential to improve the performance of the MMMs.