Postlaboratory Problems And Questions

1. Find in the literature an example of a direct electrochemical treatment of a polluting gas. *2. The general process for the electrocatalytic oxidation of an organic molecule (C„H^Oy) by Ag(II) ions in the form of AgNO4 is as follows. First, Ag(I) is oxidized to Ag(II) at the anode of an electrochemical cell. Then, Ag(II) oxidizes the organic to C02:

aAgNO^" + QjHtOy + bU20 = aAg+ + «C02 + aHN03

and the cycle can be repeated again. For example, for the oxidation of the two carbons in acetic acid to CO2 (where the carbon atom is in an oxidation state of +4), eight electrons need to be removed, whereas the same procedure for ethanol requires removal of 12 e~.

With this information write the above equation for the following substances and balance the resulting equations: ethylene glycol, acetone, and benzene.

*3. The electrocatalytic reduction of CO2 to produce n-alcohols, R-OH can occur as follows:

where R is a Ci, C2, or C3 aliphatic carbon chain.

a) Write the balanced equations for the production of methanol, ethanol, and n-propanol.

b) Find three generalized algebraic equations that relate the stoichiometric coefficients as follows: n with c, n with a, and n with b. [In other words, n = f(c), n =f'(a), n =f"(b)].

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