Extended Data Fig. 7: Propane dehydrogenation performance of catalysts using mz-deGa support.
From: Rare-earth–platinum alloy nanoparticles in mesoporous zeolite for catalysis
a, Propane conversion as a function of time on stream. b, Propylene selectivity as a function of time on stream. The supported catalysts are composed of either 1 wt% Pt or 1 wt% La. The PDH reaction conditions were as follows: 50 mg catalyst, WHSV = 11 h−1 with pure propane gas flow, and temperature of 580 °C. To determine the effect of remaining Ga species in mz-deGa on PDH performance, Pt/mz-deGa, La/mz-deGa and mz-deGa catalysts were tested. The mz-deGa catalyst showed negligible propane conversion, indicating that the remaining Ga species in the zeolite framework were not effective for PDH. Moreover, the La/mz-deGa sample showed negligible propane conversion, implying that the single atomic La species do not have PDH activity. Both mz-deGa and La/mz-deGa showed much poorer propylene selectivity compared to the Pt–REE/mz-deGa samples in Fig. 2. In the case of the Pt/mz-deGa sample, the initial propane conversion is slightly higher than that of Pt/mz shown in Fig. 2. In addition, the Pt/mz-deGa gave a noticeably lower deactivation rate than the Pt/mz sample. However, the improvement of Pt/mz-deGa in catalytic lifetime was almost insignificant when compared to that of the Pt–REE/mz-deGa catalysts. On the basis of these catalytic results, we can conclude that the remaining Ga species in mz-deGa could somehow promote the PDH performance of the supported Pt catalyst. However, this Ga contribution would be almost insignificant compared to that of Pt–REE alloy formation in the case of the Pt–REE/mz-deGa catalysts.
