Re: on the track of the hydrogen mine?

From: Dungey, Keenan (Dungey.Keenan@uis.edu)
Date: Tue Oct 01 2002 - 10:11:05 EDT

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    Dr. Campbell,

    Photolysis of water is a "Holy Grail" of modern science (see Accounts of
    Chemical Research, March 1995) for valid reasons and I'm glad to hear
    progress is being made. carbon+titanium oxide would be a very cheap
    catalyst. The pollution problem that you mention is negligible. Water
    vapor is only 1/10 the greenhouse gas that CO2 is, it already is very
    abundant in the atmosphere (1-3% vs. 360 ppm) and there is a vast, natural
    cycle for water.

    The real problem with a hydrogen fuel economy right now is that there isn't
    a good way to make hydrogen. Until photolysis works well, hydrogen is
    created from hydrocarbons, producing CO2 as a byproduct.

    Keenan

    Dr. Keenan E. Dungey
    Assistant Professor
    Chemistry Program, HSB 312
    University of Illinois at Springfield
    P.O. Box 19243
    Springfield, IL 62794-9243
    phone: 217-206-7345
    fax: 217-206-6162
    http://people.uis.edu/kdung1

    Date: Mon, 30 Sep 2002 19:33:07 -0400
    From: "bivalve" <bivalve@mail.davidson.alumlink.com>
    Subject: on the track of the hydrogen mine?

    The latest Science reports a substantially improved catalyst for
    light-induced splitting of water. Addition of carbon to the
    previously known titanium oxide catalyst yielded 8.5 percent rather
    than 1 percent efficiency. Ten percent is the Department of Energy
    estimate for commercial viability, though the energy to make the
    stuff and ease of large-scale production were not discussed in the
    summary. If further work increases the efficiency of this effort, it
    could provide hydrogen as a viable replacement for some uses of
    petroleum-derived fuels.

    Despite the favorable press that this gets as being more ecologically
    firendly, water vapor is a greenhouse gas. However, buring hydrogen
    probably will not have more effect than burning similar amounts of
    hyrdocarbons.

          Dr. David Campbell
          Old Seashells
          University of Alabama
          Biodiversity & Systematics
          Dept. Biological Sciences
          Box 870345
          Tuscaloosa, AL 35487 USA
          bivalve@mail.davidson.alumlink.com

    That is Uncle Joe, taken in the masonic regalia of a Grand Exalted
    Periwinkle of the Mystic Order of Whelks-P.G. Wodehouse, Romance at
    Droitgate Spa



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