Titanium Silicalite-1 Nanosheet-Supported Platinum for Non-oxidative Ethane Dehydrogenation

Abstract

Studies of stable catalysts for non-oxidative dehydrogenation of ethane (NDE) have been challenged by coke deposition from side reactions and thermal sintering of active species. Herein, we report a catalyst mechanism that overcomes both challenges to enable highly stable, active, and selective NDE. The catalyst is made of subnanometric platinum (Pt) species (i.e., single atoms and clusters) habituated on a two-dimensional (2D) multilamellar titanium silicalite-1 (M-TS-1) zeolite nanosheet support (i.e., Pt/M-TS-1). The ultrathin (∼3 nm) M-TS-1 nanosheets provide high external surface areas, high terminal silanol/titanol (−OH) groups, and weak Lewis acid sites. The first two characteristics enhance molecular transport and Pt dispersion in the catalyst support. The third characteristic prohibits side reactions to avoid coking and create strong Pt–support interaction, leading to well-dispersed Pt species against thermal sintering. The M-TS-1 nanosheet-supported Pt catalyst exhibited durable catalytic activity and high ethylene selectivity in the NDE.

Light olefin synthesis from a diversity of renewable and fossil feedstocks: state-of the-art and outlook

“…Single-atomic Pt distribution inside the 2D-layered Ti-Si-zeolite nanosheets and embedding of nanoclusters in HZSM-5 resulted in significantly better stability, higher activity and ethylene selectivity. 91,92 Application of MFI silicalite as support allowed obtaining highly active and stable Cr-based catalysts. Their catalytic performance was attributed to the Cr II (O-SiR) 2 sites identified by operando XAS.…”

Highly Dispersed Pt Stabilized by ZnOx-Si on Self-Pillared Zeolite Nanosheets for Propane Dehydrogenation

“…In general, the immobilization of metals by physical confinement is a common method, but it sometimes restricts the accessibilities of active sites under high temperature conditions . Therefore, enhancing metal–support interactions (MSI) by anchoring metals with support defects is an effective method against sintering. − Zhu et al prepared mesoporous Al 2 O 3 -supported PtSn clusters . The high-surface-area support with abundant defects formed by coordinatively unsaturated pentacoordinate Al 3+ could anchor Pt species.…”

“…Zeolite nanosheets are considered as ideal supports to anchor metals due to their high specific surface areas and abundant Si-OH. ,,− Yu et al supported ultrasmall metal clusters on self-pillared MFI zeolites . The loaded Rh–Ru bimetallic clusters were less than 1 nm under high temperature, resulting from the affluent Si-OH sites which were beneficial to stabilize ultrasmall metal species and inhibit agglomeration.…”

Stable co-production of olefins and aromatics from ethane over Co2+-exchanged HZSM-5 zeolite

“…For the production of aromatics from various light nparaffins, zeolites that have appropriate acidity and a ten-membered-ring channel structure such as HZSM-5 are essential for efficient aromatization catalysts, in addition to the also necessary components capable of dehydrogenation of alkanes. However, the reported catalyst systems are mainly limited to the Mo-, Zn-and Ga-based zeolite catalysts, [24][25][26][27] while the components like Pt or PtSn, [28][29][30] V (ref. 31 and 32) and Cr (ref.…”