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Ammonia - Fritz Haber

  1. Feb 27, 2006 #1
    Why did Fritz Haber develop a process for systhesis of ammonia?

    Which are the other production processes of ammonia? (except the ones named below)

    One more time I need help. Thank you. :smile:
     
  2. jcsd
  3. Feb 27, 2006 #2

    Astronuc

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    http://en.wikipedia.org/wiki/Haber_Process

    Not exactly an example of better living through chemistry.
     
  4. Mar 6, 2006 #3

    siddharth

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    On the other hand, this process contributed to the availability of fertilizers on a commercial scale.


    http://www.efma.org/Publications/10anniversary/Section02.asp
     
  5. Jun 21, 2007 #4
    Haber had to invent the process because there were not enough natural sources to supply the demand for nitrogen compounds for fertilizers. Nitrogen makes up a significant portion of organic molecules necessary for life (and the products of agriculture (food)). It's been estimated that if Haber had not figured this out, a problem that had stumped many great minds, then 2 billion of the human population that exists today could not be supported. It was necessary because N2 makes up 80% of our atmosphere, but is unreactive.

    Another process for N fixation is via bacteria metabolism and via passing air through electric arcs. The only practical method on a practical scale is the Haber-Bosch process however.
     
  6. Jun 21, 2007 #5

    chemisttree

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    Another method involves photochemically generating ammonia by the action of sunlight on transition-metal doped silicas. This was first discovered in the desert southwest where after rainstorms ammonia concentrations in desert sands were unusually high. It has since been repeated in the laboratory using iron, zirconia and titanium.
     
  7. Jun 23, 2007 #6

    siddharth

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    That sounds interesting, I've not come across this. Do you have any links or book references where I can learn more?
     
  8. Jun 23, 2007 #7

    chemisttree

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    Schrauzer, G. N., "Photofixation of milecular nitrogen by Desert Sands", American Institute of Mining, Metallurgical and Petroleum engineers, 109th Annual Meeting, Feb. 24-28, 1980.

    Augugliaro, V. et. al, "Conversion of Solar Energy to Chemical Energy by Photo-Assisted Processes- I. Preliminary Results on Ammonia Production Over Doped Titanium Dioxide Catalysts in a Fluidized Bed Reactor", International Journal of Hydrogen Energy, Vol. 7, No. 11, pp 845-849, 1982.

    Augugliaro, V. et. al, "Conversion of Solar Energy to Chemical Energy by Photo-Assisted Processes- II. Influence of the Iron Oxide Content of the Activity of Doped Titanium Dioxide Catalyst for Ammonia Photo Production", International Journal of Hydrogen Energy, Vol. 7, No. 11, pp 851-855, 1982.

    Schrauzer, G. N., Schlesinger, G., Doemeny, P. A., "Chemical Evolution of a Nitrogen ASE Model III", Reduction of Nitrogen to Ammonia: Journal of the American Chemical Society, Vol. 93, No. 7, pp 803-804.
     
    Last edited: Jun 23, 2007
  9. Jun 24, 2007 #8

    siddharth

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    Thanks chemisttree
     
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