by mikey123 » Sat 13 Dec 2014, 11:09:10
This is a good summary from the same article explaining how their process differs from previous efforts to covert methane through oxidative coupling
$this->bbcode_second_pass_quote('', 'I')n the 1970s and 1980s, there was much research on oxidative coupling, the technique Siluria uses. But research stalled in subsequent decades, said Lance Lobban, a professor at the University of Oklahoma's school of chemical, biological and materials engineering.
The process works by combining methane with oxygen - which usually results in combustion, but produces ethylene and water when a catalyst is added to precise measures of oxygen and methane.
Interest waned after the earlier research because the process required a great deal of heat and the catalysts proved unstable. The energy needs made oxidative coupling uneconomic.
"If you could improve the catalyst so the reaction would take place at lower and lower temperatures," Lobban said, "that's sort of an economic breakthrough."
That's what Dineen says his company has achieved, largely because it has used techniques that didn't exist before to develop its catalyst. The company tried out more than 75,000 different catalysts before settling on the right one.
Additionally, Siluria says it's developed a method to convert that ethylene into transportation fuels like gasoline, diesel and jet fuel with the help of a different catalyst. It says the process is more efficient than the current gas-to-liquids standard, called the Fischer–Tropsch technique.
Zaziski said applying Siluria's technology to an existing gas plant would allow it to produce gasoline from natural gas for $1 per gallon, about half the cost it takes to produce it from crude. The resulting products are "chemically indistinguishable" from petroleum-based fuels, he said, so they can be used in existing vehicles and infrastructure.
The company has produced ethylene and liquid fuels at pilot facilities in California. The new La Porte plant will be capable of producing about a ton of ethylene daily.
Siluria hopes to deploy its technology on a commercial scale in 2017 or 2018, Dineen said. If that happens, and the technology is widely adopted, the implications could be significant.
Natural gas priced so low it wasn't worth producing might become more attractive to energy companies. That could prompt other countries to pursue the shale drilling that has produced the U.S. gas bounty.
Still, Dineen acknowledged that his company faces a challenge in convincing the world of its results. "Because of prior efforts - and we're a small company - yes, there's skepticism," he said. But he expects Saudi Aramco and other major partners to lend credence to his company's work.
Chang, the IHS analyst, said Siluria still has a way to go before its results can be considered conclusive.
"Going from the advanced pilot stage to the commercial stage is still a big step they need to demonstrate," he said.