A recent discovery opens new possibilities in the quest to remove agricultural fertilizer runoff from water. Chemical engineers at Rice University have discovered a promising alternative to the widely used palladium-based catalysts currently used to clean water of nitrites. Their work uses a rhodium catalyst, which presents new capabilities beyond current technology.
New capabilities with rhodium catalyst
The researchers, led by Rice University’s Michael S. Wong, originally set out to find catalysts that were cheaper than palladium catalysts. In their search, however, they discovered that rhodium, while not cheaper than palladium, actually performs better under certain circumstances and can also be used to create additional compounds.
For example, the researchers discovered that at higher pH values, palladium created mostly dinitrogen, while rhodium created significant quantities of ammonium. In addition to working better at higher pH levels, the rhodium catalyst also created hydrazine. This discovery opens new doors for creating additional useful chemicals from nitrite wastewater.
The researchers speculate that catalytic converter technology based on the new rhodium catalyst could be most useful as a filter installed at sites prone to runoff, such as farms.