Abstract
AbstractSilica supported, 2 nm Pt and Pt–Cu catalysts with different Cu:Pt atomic ratios and similar size were evaluated for propane dehydrogenation at 550 °C. Monometallic Pt showed low propylene selectivity of 61% at 20% conversion and a TOR of 0.06 s−1. For the Pt–Cu catalysts, the dehydrogenation selectivity and TOR continuously increased with increasing Cu level in the nanoparticle, to eventually 96% selective at 20% conversion with a TOR of 0.98 s−1 for a catalyst with a Cu:Pt atomic ratio of 7.3. Synchrotron in situ X-ray diffraction and X-ray absorption spectroscopy analysis showed that Pt–Cu catalysts with increasing Cu loading formed solid solution type bimetallic structures. For example, a Pt–Cu catalyst with Cu:Pt atomic ratio of 7.3 formed solid solution containing 87% Cu. In this catalyst, the Pt active sites were geometrically isolated by the inactive metallic Cu, which was suggested to be responsible for high selectivity to propane dehydrogenation. The Cu neighbors surrounding the Pt also ...
Highlights
For the conversion of the abundant shale gas resources, Pt bimetallic catalysts are used in light olefin production through alkane dehydrogenation
For the Pt–Cu catalysts, the dehydrogenation selectivity and turnover rate (TOR) continuously increased with increasing Cu level in the nanoparticle, to eventually 96% selective at 20% conversion with a TOR of 0.98 s−1 for a catalyst with a Cu:Pt atomic ratio of 7.3
Synchrotron in situ X-ray diffraction and X-ray absorption spectroscopy analysis showed that Pt–Cu catalysts with increasing Cu loading formed solid solution type bimetallic structures
Summary
For the conversion of the abundant shale gas resources, Pt bimetallic catalysts are used in light olefin production through alkane dehydrogenation. After addition of Zn or In to Pd, the olefin selectivity increased to near 100% This high dehydrogenation selectivity was proposed to originate from the formation of the PdZn and PdIn intermetallic alloy structure on the catalyst surface which geometrically isolated the Pd catalytic sites by non-catalytic Zn or In atoms [12,13], i.e. a site isolation effect. This geometric effect is very likely applicable to other active metals including Pt and other promoters
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