[Stoves] Re Alexis Belonio article

[Thomas Reed]

Dear Taylor and all:

The "Watergas Shift" equation is always written

CO + H2O ==>  CO2 + H2O

No OH free radicals needed or possible...

Yours truly,

TOM REED       BEF

AJH wrote:
> On Fri, 06 Apr 2007 17:56:08 -0500, Robert Penn Taylor wrote:
>
>   
>> The equation Hugh gives looks like a one-step forward reaction rate of 
>> CO to CO2.  There's no nitrogen involved because this rate equation only 
>> describes the reaction:
>>
>> CO + OH --> CO2 + H
>>
>> where OH is created (I assume) via:
>>
>> O + H2O --> OH + OH
>>
>> These two reactions can be written as a single reaction:
>>
>> 2 CO + H2O + O --> 2 CO2 + 2 H
>>
>> and by dividing stoichiometric coefficients to remove the 2 in front of 
>> CO we get the form:
>>
>> CO + 0.5 H2O + 0.25 O2 --> CO2 + H
>>
>> As Hugh mentioned, the terms [CO], [O2], etc in the expression for 
>> forward reaction rate are the molar concentrations of the respective 
>> chemical species.  The exponents on these terms come directly from the 
>> stoichiometry of the reaction, so [CO] gets an exponent of 1, [H2O] gets 
>> an exponent of 0.5, and [O2] gets an exponent of 0.25.  The remainder of 
>> the equation is an Arrhenius expression for the rate constant associated 
>> with this combined reaction.
>>
>> --Penn Taylor
>>     
>
>
> Thanks Penn, part of my continuing education. So it shows how water
> can be involved in the CO to CO2 reaction but does it say anything
> about whether this creates favourable conditions over and above the
> simple 2CO+O2 reaction? Of course when burning wood there will always
> be some H2O present.
>
> AJH
>
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