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5 December 2013 11:26 am ,
Vol. 342 ,
An animal rights group known as the Nonhuman Rights Project filed lawsuits in three New York courts this week in an...
Researchers have been hot on the trail of the elusive Denisovans, a type of ancient human known only by their DNA and...
Thousands of scientists in the Russian Academy of Sciences (RAS) are about to lose their jobs as a result of the...
Dyslexia, a learning disability that hinders reading, hasn't been associated with deficits in vision, hearing, or...
Exotic, elusive, and dangerous, snakes have fascinated humankind for millennia. They can be hard to find, yet their...
Researchers have sequenced and analyzed the first two snake genomes, which represent two evolutionary extremes. The...
Snake venoms are remarkably complex mixtures that can stun or kill prey within minutes. But more and more researchers...
At age 30, Dutch biologist Freek Vonk has built up a respectable career as a snake scientist. But in his home country,...
- 5 December 2013 11:26 am , Vol. 342 , #6163
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Green Gas Gets Greener
12 April 2002 (All day)
ORLANDO, FLORIDA--Kermit was right: It's not easy being green. The compounds that can help gasoline burn more cleanly often create their own environmental problems, or they are expensive and difficult to produce. Now, there's a way to make one of the most attractive gasoline additives--a product called dimethyl carbonate (DMC)--from cheap and nonhazardous starting materials.
"It's a very interesting result," says Michele Aresta, a chemist at University Campus in Bari, Italy. However, due to proprietary concerns, the researchers didn't reveal the details of the new process when they presented it here at a 9 April meeting of the American Chemical Society, and Aresta and others note that key details determining the process's commercial viability remain unknown.
Many U.S. cities currently use an oxygen-rich compound called MTBE to reduce smog-forming exhaust. But MTBE readily dissolves in water and has fouled groundwater supplies around the country. DMC is seen as a possible replacement, because it is nontoxic and it does an even better job at helping gasoline burn cleanly. But the most prevalent production scheme uses a poisonous gas called phosgene. Moreover, DMC synthesis generates a variety of chlorinated byproducts that can damage wastewater streams.
Chemist Yiling Tian at Tianjin University in China says he and his colleagues found a better way when they devised a catalyst that makes DMC from nontoxic ingredients: methanol, dimethyl ether--a cheap methanol derivative--and a pressurized form of CO2 called supercritical CO2. What is more, Tian says that the reaction works under mild conditions and turns out DMC in high yield with no harmful byproducts.
The new process could have other environmental benefits as well, Tian contends. The process could be designed to tap CO2 present in oilfields instead of releasing it to the atmosphere, and thereby prevent the buildup of excess greenhouse gases. According to Tian, the Chinese energy giant Sino Petroleum, which funds a portion of his work, is considering scaling up the new process. If it's successful, it may be a little easier for petroleum companies to follow Kermit's lead.