Ethane and propane dehydrogenation over PtIr/Mg(Al)O

Wu, Jason; Mallikarjun Sharada, Shaama; Ho, Chris; Hauser, Andreas W.; Head-Gordon, Martin; Bell, Alexis T.

doi:10.1016/j.apcata.2015.08.029

Ethane and propane dehydrogenation over PtIr/Mg(Al)O

Journal Article · Fri Aug 28 00:00:00 EDT 2015 · Applied Catalysis. A, General

DOI:https://doi.org/10.1016/j.apcata.2015.08.029· OSTI ID:1469123

Wu, Jason ^[1]; Mallikarjun Sharada, Shaama ^[1]; Ho, Chris ^[1]; Hauser, Andreas W. ^[1]; Head-Gordon, Martin ^[1]; Bell, Alexis T. ^[1]

University of California, Berkeley, CA (United States)

Increased demand for light alkenes has motivated research on the catalytic dehydrogenation of the light alkanes and on understanding the role of catalyst composition on the activity, selectivity, and stability of Pt-based catalysts used for this purpose. This study examines the structure and performance of Pt-Ir catalysts for ethane and propane dehydrogenation, and compares them with the performance of Pt and Pt-Sn catalysts. Nanoparticles of Pt, PtSn, and PtIr were prepared in a colloidal suspension and then dispersed onto calcined hydrotalcite (Mg(Al)O). After characterization to confirm formation of a bimetallic alloy, it was observed that at high conversions, Pt₃Ir/Mg(Al)O exhibited lower initial activity than Pt₃Sn/Mg(Al)O but greater stability to coke deposition. Intrinsic rate measurements at low feed residence time revealed the following trend in activity: Pt₃Sn > Pt₃Ir > Pt. DFT calculations carried out on tetrahedral clusters (Pt₄, Pt₃Ir, Pt₃Sn) reveals that this trend in activity can be replicated and Ir is capable of alkane activation, a trait unique to this bimetallic system.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Chevron Energy Technology Co.

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1469123

Alternate ID(s):: OSTI ID: 1250092

Journal Information:: Applied Catalysis. A, General, Journal Name: Applied Catalysis. A, General Journal Issue: C Vol. 506; ISSN 0926-860X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Ethane and propane dehydrogenation over PtIr/Mg(Al)O

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