Discovery May Yield Cheaper, More Efficient Alternative to Platinum in Automotive Engines

Engineers at a company co-founded by a University of Texas at Dallas professor have identified a material that can reduce the pollution produced by vehicles that run on diesel fuel.

The material, from a family of minerals called oxides, could replace platinum, a rare and expensive metal that is currently used in diesel engines to try to control the amount of pollution released into the air.

Dr. Kyeongjiae "K.J." Cho, professor of materials science and engineering and physics at UT Dallas, says platinum is too scarce and expensive to be a long-term answer to diesel's pollution problems. University of Texas at Dallas

In a study published in the August 17 issue of Science, Dr. Kyeongjae "K.J." Cho, professor of materials science and engineering and physics at UT Dallas, and others, found that when a manmade version of the oxide mullite replaces platinum, pollution is up to 45 percent lower than with platinum catalysts.

“Many pollution control and renewable-energy applications require precious metals that are limited – there isn’t enough platinum to supply the millions and millions of automobiles driven in the world,” said Cho, a senior author of the study and co-founder of the company Nanostellar. “Mullite is not only easier to produce than platinum, but also better at reducing pollution in diesel engines.”

For the environmentally conscious, the higher fuel efficiency of diesel engines makes an attractive alternative to engines that run on gasoline. On the flip side, compared with gasoline engines, diesel vehicles produce more nitric oxide (NO) and nitrogen dioxide (NO₂), which are known as NOx pollutants.

In June, the World Health Organization upgraded the classification of diesel engine exhaust as carcinogenic in humans, putting it in the same category as cigarette smoke and asbestos. Countries throughout the world have drafted guidelines to reduce diesel air pollution in the next decade.

Platinum, because of its expense to mine and limited supply, is considered a precious metal. Estimates suggest that for 10 tons of platinum ore mined, only about 1 ounce of usable platinum is produced.

In 2003, Cho became a co-founder and lead scientist at Nanostellar, a company created to find catalysts through a material design that would replace platinum in reducing diesel exhaust (carbon monoxide, or CO, and NOx pollutants). His company has designed and commercialized a platinum-gold alloy catalyst that is a viable alternative to platinum alone, but until this experiment with mullite, had not found a catalyst made of materials that are less expensive to produce.

Dr. Weichao Wang, who earned his Ph.D. from UT Dallas in 2011, was part of the research team. University of Texas at Dallas

Cho, also a visiting professor at Seoul National University in South Korea, and his team suspected that the oxygen-based composition of mullite, originally found off the Isle of Mull in Scotland, might prove to be a suitable alternative. His team synthesized mullite and used advanced computer modeling techniques to analyze how different forms of the mineral interacted with oxygen and NOx. After computer modeling confirmed the efficiency of mullite to consume NOx, researchers used the oxide catalyst to replace platinum in diesel engine experiments.

“Our goal to move completely away from precious metals and replace them with oxides that can be seen commonly in the environment has been achieved,” Dr. Cho said. “We’ve found new possibilities to create renewable, clean energy technology by designing new functional materials without being limited by the supply of precious metals.”

The mullite alternative is being commercialized under the trademark name Noxicat. Dr. Cho and his team will also explore other applications for mullite, such as fuel cells.

Dr. Weichao Wang, who earned his Ph.D. in materials science and engineering in 2011 under Dr. Cho’s supervision in Erik Jonsson School of Engineering and Computer Science at UT Dallas, was lead author of this study. Researchers from the University of Kentucky and Huazhong University of Science and Technology in China were also involved in this work.

The study was supported by the Texas Advanced Computing Center, Nanostellar and the National Research Foundation of South Korea.