Abstract
Zeolite-supported metal bifunctional catalysts have been widely applied in many chemical industrial processes, and their catalytic performances greatly depend on the synergetic effects between hydro/dehydrogenation and acid functions. In this work, we design and prepare a novel bifunctional catalyst by coupling SOD-encapsulated Pt NPs (Pt@SOD) with HZSM-5 (Pt@SOD + HZSM-5). Successful encapsulation of Pt NPs in sodalite (Pt@SOD) was confirmed by TEM and toluene hydrogenation reaction. Upon mixing Pt@SOD with HZSM-5 and activating at 400 °C, solid-state ion exchange occurred between the Na+ in SOD and the H+ in HZSM-5, resulting in forming surface hydroxyl groups on the Pt@SOD and generating the medium acid sites on HZSM-5. Pt@SOD + HZSM-5 showed an outstanding selectivity to C6-cyclic products in hydrogenative conversion of methylcyclopentane (MCP) via combining spillover hydro/dehydrogenation and acid-catalyzed mechanism. Spillover hydro/dehydrogenation is the key to achieving high selectivity to C6-cyclic products. Pt@SOD + HZSM-5 coupling catalyst exhibited the excellent sulfur-tolerant ability.
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