Photoreductive Sequestration of CO(sub 2) to Form C(sub 1) Products and Fuel. Quarterly Progress Report No. 3 for the Months of October through December 2002.

Mill, T. ; Tungudomwongsa, H.

Technical Information Center Oak Ridge Tennessee

关键词: Synthetic fuels;    Carbon dioxide;    Analytical methods;    Formaldehyde;    Formates;   

RP-ID  :  DE2005837760

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Analytical methods for determining formic and oxalic acids, formaldehyde and methanol have been evaluated and/or optimized for measuring products from photoreduction of CO(sub 2) in illuminated, aqueous suspensions of photocatalysts. An electrophoretic analysis method can detect aqueous formate and oxalate ions at 3 and 1 (micro)M respectively. Recalibration of the Nash formaldehyde determination shows that as little as 0.5 (micro)M can be detected spectrally. Several experiments using suspensions of TiO(sub 2), SrTiO(sub 3) and SrTiO(sub 3) with Cr and Sb were tested in CO(sub 2) saturated solutions. No formate was detected in most experiments. However adding 2-propanol to a CO(sub 2)/TiO(sub 2) suspension gave significant amounts of formate and some formaldehyde by blocking the re-oxidation of formate by semiconductor holes. Loss of C(sub 1) products by re-oxidation is probably an important process limiting the accumulation of formate, formaldehyde and methanol.