catalyst graphic (IMAGE)
Caption
This scanning tunneling electron microscope image shows the structure of a copper-zinc oxide catalyst that converts methane to methanol with and without water. Triangular zinc-oxide "islands" rest on a copper-oxide thin film (flat background) over a copper substrate (not seen). The "step" edges between copper-oxide and zinc-oxide (A, where blue is zinc, red is oxygen) are the main active sites for producing methanol when no water is present. The semi-flat areas have a relatively perfect crystal structure (B) and are inert during the reaction. The very rough areas are likely associated with defects—in this case with fewer zinc atoms and an oxygen-rich crystal structure (C)—and are the most active sites for methanol production when water is present.
Credit
Brookhaven National Laboratory
Usage Restrictions
OK for use with stories about this research.
License
Original content