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3E6 Group 8 Article Review

Page history last edited by 3E6 group 8 14 years, 9 months ago

Group 8:

Carbon Dioxide Snatched From The Air By ScienceDaily (Apr. 21, 2009)

http://www.sciencedaily.com/releases/2009/04/090420121342.htm

 

Some questions to think about:

The concentration of carbon dioxide in the air today is approximately 0.03%. However, the concentration of carbon dioxide in air has not always been 0.03%. Find out how scientists are able to find out about the amount of carbon dioxide in the air hundred thousand years ago. Clue: ICE.


 

Names  of Group Members:

1. Nicholas Lim

2. Erwin Tan

3. Jesmond Tan

4.

 

Summary of Assigned Article

(Pick out the key points of the article, Less than 200 words)

 Chemists would also like to be able to simply produce carbon compounds out of CO2 from air.

Unfortunately, its carbon–oxygen bonds are too strong to be broken easily. developed a novel reaction scheme by which CO2 can be efficiently converted into methanol under very mild conditions.it is based on an N-heterocyclic carbene catalyst and a silane as the reducing agent. basic framework of an N-heterocyclic carbene is a five-membered ring made of two nitrogen and three carbon atoms Instead of having the usual four bonds, one of these carbon atoms only has two. The two electrons left over in the form of a lone pair, which makes this species highly reactive—reactive enough to attack CO2.The carbene activates the CO2, but is then split off again to end the reaction cycle in its original state. The formal reaction partner is a hydrosilane, an organosilicon compound that acts as a reducing agent. The reaction product into which the CO2 is converted can easily be collected in the form of methanol in the last step of the reaction series. Methanol is an important starting material for many chemical syntheses and serves as an alternative fuel and as a raw material for the production of energy in methanol fuel cells. big advantage: unlike prior reaction mechanisms using metal-containing catalysts, air can be used as the source of the CO2 because the carbene catalyst is not sensitive to oxygen. The carbene is more efficient than the metal-containing catalysts as well, and the reaction can be carried out under very mild conditions.

 

 

 

Further Reading on Related Articles

(Include information from other websites that support and do not support your assigned article. You should provide the link of the websites that you obtain the information from.)

succeeded in unlocking the potential of carbon dioxide – a common greenhouse gas – by converting it into a more useful product.by using organocatalysts, they activated carbon dioxide in a mild and non-toxic process to produce methanol, a widely used industrial feedstock and clean-burning biofuel. 

Organocatalysts are catalysts that are comprised of non-metallic elements found in organic compounds. that are stable and easily stored. They do not contain toxic heavy metals and can be produced easily without high costs.made carbon dioxide react by using N-heterocyclic carbenes (NHCs), a novel organocatalyst. In contrast to heavy metal catalysts that contain toxic and unstable components, NHCs are stable, even in the presence of oxygen. Hence, the reaction with NHCs and carbon dioxide can take place under mild conditions in dry air.only a small amount of NHC is required to induce carbon dioxide activity in a reaction.

 

 

 

http://www.sciencedaily.com/releases/2009/04/090416102247.htm

 

 

 

 

THREE Questions for Critques

(Answers to questions should be found in your wiki article.)

1.Why do scientists envy green plants?

2.What can be done to break down carbon dioxide?

3.Explain briefly how a carbon dioxide atom is broken down

 


Critique Group

 

Group Number:             1     

 

Answers to Questions

1.

2.

3 .

4.

5.

Three things good about the Article Review

i.

ii.

iii.

 

Two learning points from the Article Review

A)

B)

 

One possible improvement for the Article Review

 


 

Critique Group

 

Group Number:            2     

 

Answers to Questions

1.

2.

3.

 

Three things good about the Article Review

i.

ii.

iii.

 

Two learning points from the Article Review

A)

B)

 

One possible improvement for the Article Review

 


 

 

 

 

Comments (2)

3E6 group 6 said

at 3:25 pm on Jun 28, 2009

Sorry Last edited by us cause some one in our group blur blur go edit yours

3E6 group 8 said

at 9:09 pm on Jun 30, 2009

Some times you guys should control your group member on what they do please.

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