jueves, 16 de julio de 2009

ExxonMobil Bets $600 Million on Algae


TOMADO DE: Scientific American, http://www.scientificamerican.com/article.cfm?id=biofuels-algae-exxon-venter

Oil giant Exxon Mobil Corp. is making a major jump into renewable energy with a $600 million investment in algae-based biofuels.

Exxon is joining a biotech company, Synthetic Genomics Inc., to research and develop next-generation biofuels produced from sunlight, water and waste carbon dioxide by photosynthetic pond scum.

"The world faces a significant challenge to supply the energy required for economic development and improved standards of living while managing greenhouse gas emissions and the risks of climate change," said Emil Jacobs, vice president of research and development at Exxon Mobil Research and Engineering Co. "It's going to take integrated solutions and the development of all commercially viable energy sources, improved energy efficiency and effective steps to curb emissions. It is also going to include the development of new technology."

Exxon Mobil's collaboration with Synthetic Genomics will last five to six years, Jacobs said, and will involve the creation of a new test facility in San Diego to study algae-growing methods and oil extraction techniques. After that, he said the company could invest billions of dollars more to scale up the technology and bring it to commercial production.

"We're not claiming to know all the answers," said Craig Venter, founder and CEO of Synthetic Genomics, which has so far done early work on algae strains. "There are different approaches to what is truly economically scalable, so we're testing things and giving a new reality to the timelines and expectations of what it takes to have a global impact on fuel supply."

Jacobs and Venter are mum about the specific technology the collaborative effort would employ. They said the team would investigate all options, including growing organisms in open ponds and in closed photobioreactors.

They added that they were likewise uncertain what end-product fuels would result from the collaboration. Other startup companies have announced that they were producing both synthetic crude and biodiesel using photosynthetic algae (Greenwire, April 28).

"As far as products to expect from this program, our intent is to make hydrocarbons that look a lot like today's transportation fuels," Jacobs said. "We want to produce hydrocarbons that look like today's refinery products, that can go into a refinery to be processed along with other petroleum streams and then used in the transportation fleet or even jet fuel. And we think we've got a good chance of doing that."

Exxon Mobil launched the partnership after years of being publicly opposed to investing in renewable energy. Privately, though, Jacobs said the company has been investigating the sector for years.

"It's fair to say that we looked at all the biofuels options," Jacobs said. "Algae ended up on top."

Others in the algae-biofuels industry say Exxon Mobil's investment validates the sector.

"A couple years ago, the petroleum institute said there's only a couple of years left for oil, and now they're really finally acting on that," said Riggs Eckelberry, president and CEO of OriginOil Inc. "Algae is the feedstock to overtake petroleum. It's the real alternative to petroleum."

Environmentalists were more cautious in their appraisal of the Exxon Mobil-Synthetic Genomics plan.

"They've never done anything like this before -- invested real money in the renewables sector," said Kert Davies, research director at Greenpeace. "We've always said [the oil industry] has to be part of the climate change solution. We can't solve anything without companies like Exxon helping."

He added, "I'm guarding my optimism."

Exxon Mobil's timing is noteworthy, Davies said, because of the ongoing energy and climate legislative fight.

"It's interesting timing as the oil companies are struggling to find a place at the table," Davies said.

martes, 14 de julio de 2009

Británicos crean miniauto que funciona con hidrógeno


TOMADO DE: La Nación, http://www.nacion.com/ln_ee/2009/julio/14/aldea2026301.html

Científicos de las universidades de Oxford y Cranfield, en el Reino Unido, mostraron al público el primer prototipo de un carro ligero con motor de hidrógeno que es tres veces más limpio que todos los carros ecológicos actuales y que es capaz de recorrer casi 400 kilómetros utilizando solo un kilo de ese gas.

El vehículo se llama el Riversimple y consiste en un automóvil compacto con carrocería hecha en fibra de carbono que apenas pesa 350 kilos.

Este se parece bastante a los conocidos autos Smart Fortwo, pero no emite dióxido de carbono, solo agua.

El carro funciona con una sola batería de seis kilovatios que es alimentada por hidrógeno (H). Este hidrógeno proviene de la separación de los elementos fundamentales del agua que son precisamente oxígeno e hidrógeno.

Para lograr esta separación, los expertos utilizan la energía solar y la inyección de electricidad, en un proceso conocido como electrólisis.

Una vez cargada, la batería de hidrógeno del Riversimple brinda energía a los motores eléctricos en cada una de sus cuatro ruedas, los cuales también sirven como frenos y generadores de electricidad.

Gracias a esta tecnología, la velocidad máxima del carro es 80 kilómetros por hora. El vehículo puede alcanzar hasta los 55 kilómetros por hora en solo 5,5 segundos.

Pros y contras. A pesar de que el invento tiene buenas intenciones, algunos expertos creen que está destinado al fracaso por lo costosa que es aún la tecnología que utiliza hidrógeno. Además, sus detractores destacan que no existe una red para el abastecimiento de los vehículos con este combustible, lo que podría disuadir a los compradores.

Sin embargo, anticipándose a estos malos augurios, sus promotores idearon dos formas para superar los obstáculos.

Primero, con el fin de mejorar la tecnología y abaratar los costos, ellos colocaron los planos del nuevo carro en línea, para que estén disponibles de forma gratuita para diseñadores y especialistas de todo el mundo desde un sitio web.

“Los interesados en carros con motor de hidrógeno pueden conocer todos los pormenores técnicos logrados por nuestro equipo hasta ahora y, partir de ahí, mejorarlos a su antojo”, dicen los británicos en el sitio riversimple.com.

“Cualquier empresa que quiera fabricar su propia versión de este vehículo podrá hacerlo sin ninguna repercusión legal y utilizando materiales locales con el fin de abaratar los costos”, agregaron sus creadores.

A esto se le llama la tecnología libre open-source , o código abierto, porque permite a los internautas acceder a la materia prima con la que se fabricó el producto y alterarlo a su antojo. Además, se les da la oportunidad de fabricar y vender su producto libremente.

En segundo lugar, los expertos no pretenden vender el vehículo, sino alquilarlo, garantizando ellos mismos el mantenimiento y abastecimiento del combustible requerido. El alquiler será de $315 al mes (¢180.000) y podrá arrendarse hasta por 20 años, que es la vida útil del carro.