TY - JOUR
T1 - Ethane and propane dehydrogenation over PtIr/Mg(Al)O
AU - Wu, Jason
AU - Mallikarjun Sharada, Shaama
AU - Ho, Chris
AU - Hauser, Andreas
AU - Head-Gordon, Martin
AU - Bell, Alexis T.
PY - 2015/10/5
Y1 - 2015/10/5
N2 - 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. The present 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.
AB - 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. The present 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.
KW - Bimetallic alloy
KW - Catalyst deactivation
KW - Ethane dehydrogenation
KW - Iridium
KW - Platinum
KW - Propane dehydrogenation
KW - Tin
UR - http://www.scopus.com/inward/record.url?scp=84940975151&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2015.08.029
DO - 10.1016/j.apcata.2015.08.029
M3 - Article
AN - SCOPUS:84940975151
SN - 0926-860X
VL - 506
SP - 25
EP - 32
JO - Applied Catalysis A
JF - Applied Catalysis A
ER -