(453a) Direct Methane Conversion By Atomically Thin Platinum Nanolayers on Two Dimensional Metal Carbides
AIChE Annual Meeting
2022
2022 Annual Meeting
Fuels and Petrochemicals Division
Value-Added Chemicals from Natural Gas II
Wednesday, November 16, 2022 - 8:00am to 8:19am
Efficient and direct conversion of methane to value-added products has been a long-term challenge in natural gas and shale gas applications. In this presentation, we show that atomically thin nanolayers of Pt with a single or double atomic layer thickness, supported on a two-dimensional molybdenum titanium carbide (MXene), catalyse non-oxidative coupling of methane to ethane/ethylene (C2). Kinetic and theoretical studies, combined with in-situ spectroscopic and microscopic characterizations, demonstrate that Pt nanolayers anchored at the hexagonal close-packed sites of the MXene support can activate the first CâH bond of methane to form methyl radicals that favour desorption over further dehydrogenation and thus suppress coke deposition. At 750 °C and 7% methane conversion, the catalyst runs for 72 hours of continuous operation without deactivation and exhibits >98% selectivity towards C2 products, with a turnover frequency of 0.2â0.6 sâ1. Our findings provide insights into the design of highly active and stable catalysts for methane activation and create a platform for developing atomically thin supported metal catalysts.