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Heterogeneous Catalysis of the Photodegradation of Chloroform
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The ability of five substances – Amberlite IRA-900 anion exchange resin in the Cl<sup>-</sup> form, CuCl<sub>4</sub>
<sup>2-</sup> supported on
Dowex 2-X8 anion exchange resin (CuCl<sub>4</sub>
<sup>2-</sup>/Dowex), FeCl<sub>4</sub><sup>-</sup> supported on Dowex 2-X8 (FeCl4<sup>-</sup>/Dowex), FeCl3 supported
on silica gel (FeCl<sub>3</sub>/SiO<sub>2</sub>), and unmodified MCM-41 mesoporous silica – to catalyze the photodecomposition of chloroform
to COCl<sub>2</sub> and HCl in a suspension irradiated under oxygen at wavelengths above 345 nm was compared, choosing
amounts of each catalyst to optimize the decomposition rate. Amberlite, FeCl<sub>4</sub><sup>-</sup>/Dowex, and MCM-41 were the most active.
The same comparison was made for chloroform irradiated under air by sunlight, for which Amberlite, CuCl<sub>4</sub>
<sup>2-</sup>
/Dowex, and MCM-41 were the most active. After irradiation, all samples had a COCl<sub>2</sub> to HCl ratio greater than 10:1. A
photodecomposition mechanism different from that observed in the gas phase is proposed that includes the participation
of trichloromethylhydroperoxide.
Title: Heterogeneous Catalysis of the Photodegradation of Chloroform
Description:
The ability of five substances – Amberlite IRA-900 anion exchange resin in the Cl<sup>-</sup> form, CuCl<sub>4</sub>
<sup>2-</sup> supported on
Dowex 2-X8 anion exchange resin (CuCl<sub>4</sub>
<sup>2-</sup>/Dowex), FeCl<sub>4</sub><sup>-</sup> supported on Dowex 2-X8 (FeCl4<sup>-</sup>/Dowex), FeCl3 supported
on silica gel (FeCl<sub>3</sub>/SiO<sub>2</sub>), and unmodified MCM-41 mesoporous silica – to catalyze the photodecomposition of chloroform
to COCl<sub>2</sub> and HCl in a suspension irradiated under oxygen at wavelengths above 345 nm was compared, choosing
amounts of each catalyst to optimize the decomposition rate.
Amberlite, FeCl<sub>4</sub><sup>-</sup>/Dowex, and MCM-41 were the most active.
The same comparison was made for chloroform irradiated under air by sunlight, for which Amberlite, CuCl<sub>4</sub>
<sup>2-</sup>
/Dowex, and MCM-41 were the most active.
After irradiation, all samples had a COCl<sub>2</sub> to HCl ratio greater than 10:1.
A
photodecomposition mechanism different from that observed in the gas phase is proposed that includes the participation
of trichloromethylhydroperoxide.
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