(560ee) Synthesis, Characterization and Mechanistic Study of Structured Ga and Gapt Promoted ZSM-5 in Ethane Dehydroaromatization

The existence of ethane in shale gas pipeline causes condensation, and the separated ethane is often referred to as stranded gas. Therefore, the utilization of stranded ethane has drawn significant interest by researchers due to its economic value. Previously, we have investigated GaPt/ HZSM-5, Pt/ HZSM-5, and Ga/ HZSM-5 for ethane dehydroaromatization (DHA) in a conventional fixed bed reactor. The GaPt/HZSM-5 showed the best performance by having good aromatic and hydrogen selectivity. It also showed a higher activity with a slower deactivation than the other catalysts. In comparison an additional set of Ga catalysts were made using a different preparation method. The galloaluminosilicate ZSM-5 (GaMZ-5) was prepared by hydrothermal in-situ synthesis method. When compared with the GaPt/ HZSM-5 prepared by dry impregnation method, the GaMZ-5 shows higher ethane conversion and aromatics selectivity in ethane DHA using a fixed bed reactor. Similar trend was observed on platinum promoted GaMZ-5. Furthermore, these two catalysts system are tested in microwave reactor to compare their performance under electromagnetic excitations. Pyridine DRIFTS, surface area analysis, NH₃ temperature programmed desorption and other technologies were applied to characterize both dry-impregnated and hydrothermal in-situ synthesized Ga-Pt catalysts.