Abstract：Catalytic conversion of dimethyl ether to hydrocarbon and effect of isobutane co-feed on catalytic performance were studied over H-MCM-22 and Pt/H-MCM-22. Comparisons of catalyst lifetime, product distribution and overall productivity were elucidated based on dual-cycle mechanism and homologation pathway. Both catalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), nitrogen adsorption, ammonia temperature-programmed desorption (NH3-TPD), pyridine adsorption infrared spectroscopy (Py-IR), solid-state 27Al magic-angle spinning (MAS) NMR. Isobutane co-feed could enhance both olefin-based cycle and aromatic-based cycle and was proved to be effective for product selectivity adjusting and induction period reducing due to the enhanced overall productivity in the early stage but at the cost of shorter lifetime of catalyst. Pt loaded on zeolite provided extra Lewis acidity and lead to faster deactivation, it could also benefit hydrogen transfer, hydrogenolysis and dehydrogenation of alkanes at the same time.
Duan Yuezhang,Zhai Miao,Zhou Xinggui et al. Effect of Isobutane Co-Feed over Pt/H-MCM-22 on Selectivity of the Dimethyl Ether to Hydrocarbon Conversion[J]. 化学反应工程与工艺, 2018, 34(1): 20-27.
