A fundamental characteristic on photochemical adsorption of carbon dioxide to calcium hydroxide

In photochemical treatments for carbon dioxide (CO/sub 2/) recovery, a suitable photolytic material and a photon device have been required. In this work, a photochemical reaction for CO/sub 2/ adsorption to calcium hydroxide (Ca(OH)/sub 2/) is experimentally investigated. The photon device is evaluated by the photochemical effect of vacuum ultraviolet irradiation from a Xe discharge lamp. The experiment is conducted in following procedures: (1) the generation of OH and H radicals and the conversion to calcium oxide (CaO) from moisturized Ca(OH)/sub 2/ powder activated by ultraviolet irradiation, (2) the conversion of CO/sub 2/ to other molecules such as HCO/sub 3/ and H/sub 2/CO/sub 3/ with generated OH and H radicals, and (3) the final conversion of CaO with generated HCO/sub 3/ and H/sub 2/CO/sub 3/ to calcium carbonate (CaCO/sub 3/). The CO/sub 2/ removal processes and the fundamental characteristic obtained from an experimental approach are presented.