Purdue Develops Alloy For Commercially Viable Hydrogen Production
February 21, 2008 1:43 PM
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Jerry Woodall, a professor at Purdue University invented the new alloy production process, promising affordable, easy hydrogen.
(Source: Purdue University)
Pictures of the alloy in water, reacting to produce hydrogen, as evidenced by bubbling.
(Source: Purdue University)
The byproduct of the process is a recyclable mix of aluminum and gallium-indium-tin ores.
(Source: Purdue University)
Here a Purdue researcher uses the hydrogen produced by the process to power an internal combustion engine.
(Source: Purdue University)
While some hydrogen research focuses on simulating nature, a new metal reagent developed by Purdue University promises economic viability
Jerry Woodall, a distinguished professor of electrical and computer engineering at Purdue University, is firmly ground in the world of commercial production. When he began researching ways to improve hydrogen production using aluminum reagents, his goal was simple -- if it wasn't commercially viable, it wasn't a success.
While recent researchers have reported significant breakthroughs in fields such as
microbial hydrogen production
, these methods currently are too inefficient to currently be
feasible as a non-subsidized fuel alternative
. While these methods are exciting in that they may one day lead to cleaner and more effective energy production, many agree that
the time for hydrogen is now
, and waiting for theoretical methods is simply impractical.
Fortunately Purdue's Woodall
developed a more down to Earth method of hydrogen production
that promises a feasible infrastructure and short term commercial viability. Woodall states, "We now have an economically viable process for producing hydrogen on-demand for vehicles, electrical generating stations and other applications."
The key to the method is a new aluminum reagent, which Woodall invented. The new reagent is composed of 95 percent aluminum and then a critical 5 percent mixture of gallium, indium and tin to improve its reactive character. Previous similar alloys used far more gallium, which is very expensive. By cutting down the gallium, Woodall greatly reduced the costs of hydrogen production.
When the new alloy is exposed to water, it reacts to create hydrogen gas and oxygen. The oxygen then bonds to the aluminum to form aluminum oxide, also known as alumina. It is cheaper to recycle alumina back to aluminum than it is to refine aluminum from bauxite ore, which is another element contributing to its efficiency. Woodall illuminates, "After recycling both the aluminum oxide back to aluminum and the inert gallium-indium-tin alloy only 60 times, the cost of producing energy both as hydrogen and heat using the technology would be reduced to 10 cents per kilowatt hour, making it competitive with other energy technologies."
Control of the microscopic structure of the solid aluminum and the gallium-indium-tin alloy mixture is critical to the technology's success. The mixture is a "two-phase" mixture, meaning that it features abrupt changes in composition between one constituent to another. Woodall explains this challenge stating, "This is because the mixture tends to resist forming entirely as a homogeneous solid due to the different crystal structures of the elements in the alloy and the low melting point of the gallium-indium-tin alloy. I can form a one-phase melt of liquid aluminum and the gallium-indium-tin alloy by heating it. But when I cool it down, most of the gallium-indium-tin alloy is not homogeneously incorporated into the solid aluminum, but remains a separate phase of liquid. The constituents separate into two phases just like ice and liquid water."
Researchers had two options -- fast cooling to leave separate alloys or slow cooling to yield a single solid alloy brick. At first they tried fast cooling, which required a puddle of gallium-indium-tin to initiate the reaction. However, when they turned to the slow-cooled alloy, they were impressed to discover that it reacted just as well, or better, eliminating the need for the liquid gallium-indium-tin alloy. Woodall adds, "That was a fantastic discovery. What used to be a curiosity is now a real alternative energy technology."
The Purdue team is currently completing work on developing a production method to produce briquettes of the alloy. These briquettes could be dropped into a tank of water, producing pure hydrogen. This would eliminate both the need for hydrogen storage and hydrogen transportation, two critical obstacles for the hydrogen industry.
The gallium-indium-tin alloy in the process is inert and is able to be recovered with almost 100 percent efficiency. Woodall says even the less efficient aluminum recycling produces much less carbon emissions than traditional fuel. He states, "The aluminum oxide is recycled back into aluminum using the currently preferred industrial process called the Hall-Héroult process, which produces one-third as much carbon dioxide as combusting gasoline in an engine."
In order to fully realize the technology on a national scale for fuel use, alumina recycling infrastructure would need to be dramatically expanded. Additionally, gallium-indium-tin recycling would need to be added. This infrastructure would be expensive, but according to Woodall "the economic risk is large, but the potential payoff is also large."
Woodall won the 2001 National Medal of Technology, the highest award for technological achievement in the U.S. Woodall his fellow researchers will present their findings on Feb. 26, 2008 at the Materials Innovations in an Emerging Hydrogen Economy conference in Cocoa Beach, Fla. The alloy production process's primary patent title is owned by the Purdue Research Foundation. Purdue has licensed the technology to an Indiana startup company, AlGalCo LLC., which Purdue hopes will be the first company to implement the technology commercially.
Purdue's solution is similar to the University of Leeds'
new method of producing hydrogen from biofuel waste sludge
, in that both solutions are economically feasible, but require the development of production infrastructures. However the new method from Purdue can make hydrogen from a far more plentiful source -- pure water.
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2/22/2008 12:29:28 PM
Ok, here's something. Talking about theoretical maximums in energy production from hydrogen (notice, these values can never be reached because of inefficiencies in capturing and transferring energy, and heat loss): the energy produced by the formation of water is 400 kJ/mol. So, say we have 6 metric tons of hydrogen (from 54 tons of aluminum). That gives us 3,000,000 moles, so reacting all of that to water would give off 1,200,000,000 kJ of energy. Since Joules Per kilowatt-hour (kWh) = 3.6*10^6, we get 333,333 kilowatt-hours from this 1 ton of hydrogen.
Now Chernobyl68 pointed out "it takes some 15.7 kWh of electricity to produce one kilogram of aluminium from alumina". So to recycle 54 tons (54,000 kg) it would take 847,800 kilowatt hours. Therefore, in the end,
we would lose 514,467 kilowatt hours
. That's how much we'd have to put into this process to keep it going. Since the average cost of electricity is something like 10¢/kWh in the U.S. (
), roughly anyways, that's $51,446.70 we'd be spending on energy to make 6 tons of hydrogen if all of the hydrogen's energy was being put right back into the grid and recaptured. A complete waste to do that.
Looking at it from another way for cars (and a more practical way, since the energy from the hydrogen isn't going back into the electrical grid if it's being used in a car), it costs $2,520 per 1 ton of aluminum (
), or $136,080 to buy the 54 tons we used to make 6 tons of hydrogen. From earlier, I calculated 1 ton of hydrogen could fill 75 of the honda fuel cell cars. 6 tons would obviously fill 450 cars. This comes out to
$302.40 per car to fill the 171 liter tank for a rang of 270 miles
! Not good at all. For a little over 20 bucks I could fill my Kia Rio and go about 350 miles if on the highway.
Looking at it this way, this tech doesn't seem good in the least as it is now (as aluminum is processed and costs now). So, you're right, as it stands it's a move sideways, or worst, backwards. (At least if my calculations are correct or anywhere near reality)
2/22/2008 1:11:03 PM
While, I have not had the time or inclanation to double check your numbers. Regardless of our personal opinions regarding global warming, we all agree that reliance on fossils fuels has to come to and end sometime.
I put forth the idea that energy needed to recycle the alumina would come from Nuclear sources rather than coal and/or gas. A nuclear infrustructor could make up the gap you calculations have pointed out.
I also submit that since refinement of alumina to aluminumum requires a large amount of contant electricity. This is the type of power which is acceled by nuclear power plants since demand is constant.
1. build nuclear plants
2. solve the issue of were alumina is recycled.
3. solve the issue of trace elements recycle.
this finally equals a realy economical solution for alternative to gasoline powered vehicles.
2/22/2008 1:47:16 PM
I agree with you fully. However, this is too far out of my league. Still, there should be a way to close the gaps on these figures. For instance, increasing aluminum production and expanding recycling systems should quickly drop the price of aluminum and potentially make the solution competitive. As things are right now, they are not set up for the sort of infrastructure and systems as would be needed by this technology--it is not optimized as gasoline as become from a century of use.
Our reliance on combustion engines does have to end, period. The question is how and when. It won't be easy because gas is so cheap, and it's so hard to move away from what we've already established. I've gone as far as I can in analyzing this, though it still is the best option for making hydrogen yet as far as I see and know; I leave it up to the future to decide.
2/22/2008 4:53:36 PM
checking the numbers
$2500 per ton (I'm going to assume a 2000 lb ton)
so 9 x 2520 = about $22,700 for
for 1 ton of hydrogen, which is about 907kg H2.
at .07 kg/L
907 kg / .07 kg.L = just about 13,000 liters Liquid H2.
Filling a 171 Liter (about 45 US Gal) tank gives you
13,000 / 171 = 76 tanks (pretty close, but I've rounded)
$22,700 / 76 = $298 dollars a tank. not bad
Hydrogen is not a high "energy density" fuel like gasoline or diesel. Ethanol is better, but still not as good as a refined fuel like gasoline as far as energy density (this is why your mpg goes down while driving with ethanol fuel)
My belief is still, that the best course is to pursue all electric cars, or hybrids to help develop the bettery technology to better energy density.
We need a paradigm (sp?) shift in energy production, and hopefully will achieve commercial Fusion power in the next 50 years. Chemical energy production (largely fossil Fuels) will simply change the atmospheric content of our planet over the long term, and will have environmentally damaging effects at some point (when that point is is for better minds than mine).
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