I D
× COMMENTARYCOVER STORYIN THE NEWSNEWSFRONTSCHEMENTATOR + Show More BUSINESS NEWSTECHNICAL & PRACTICALFEATURE REPORTFACTS AT YOUR FINGERTIPSTECHNOLOGY PROFILEEQUIPMENT & SERVICESFOCUSNEW PRODUCTS + Show More SHOW PREVIEWS

Comment uncategorized

Engineering catalysts with ALD

By Scott Jenkins |

Atomic-layer deposition (ALD), a surface engineering technique that applies layers of coatings in a conformal way at single-atom thicknesses, is being investigated for its potential to improve the selectivity and durability of industrial catalysts under a U.S. Dept. of Energy grant awarded earlier this year to Forge Nano Inc. (Thornton, Colo.; www.forgenano.com). The grant will advance the use of Forge Nano’s low-cost ALD techniques for surface engineering of commercial catalyst materials for a range of industrial reactions in food production, petroleum refining and petrochemicals manufacturing. ALD works by exposing a substrate material to alternating pulses of gaseous “precursor” molecules that react with surfaces in self-limiting ways (diagram). ALD can be used with substances from across the periodic table. In a classic ALD example, a surface with hydroxyl-groups is treated with gaseous trimethylaluminum (TMA; the first precursor). When the surface hydroxyls are completely consumed by the TMA, the reaction stops. In a second step, water (second precursor) is pulsed to replace the methyl groups, leaving a layer of aluminum and regenerating the surface hydroxyl groups for another round of layering, if desired. In this way,…
Related Content

Chemical Engineering publishes FREE eletters that bring our original content to our readers in an easily accessible email format about once a week.
Subscribe Now
Temperature Instruments Improve Operations
Steel Belt Units for Medical Membranes
Upstream Oil & Gas: Automation intelligence from wellhead to distribution
Video - CoriolisMaster
Video - Do you really need a thermowell?

View More