Changing Surface Composition and Product Yields of Perovskite Catalysts (IMAGE)
Caption
How perovskite catalysts are made and treated changes their surface compositions and ultimate product yields. If certain perovskite catalysts of the formula ABO3 are heat-treated, the catalyst's surface terminates predominantly with A (a rare-earth metal cation depicted in light purple) and less with B (a transition-metal cation shown in dark purple)--and isopropanol conversion over this basic catalyst primarily yields acetone. If the same catalyst is treated chemically instead of with heat, the catalyst's surface termination is instead mostly B and less A and is more acidic--and isopropanol conversion yields mainly propylene.
Credit
Image credit: Oak Ridge National Laboratory, U.S. Dept. of Energy; illustrator Adam Malin
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