生物油制氢中CO_2吸收剂改性研究

THE MODIFYING OF CARBON DIOXIDE SORBENTS IN HYDROGEN PRODUCTION FROM BIO-OIL

在耦合CO2吸收剂的生物油水蒸气重整反应中,通过在白云石中添加碱金属钾元素提高吸收剂的性能,进而提高H2产率与产气中的H2含量。研究表明:添加K2CO3的白云石经煅烧后制成的吸收剂有效促进了重整反应的进行,其中添加2%K2CO3的白云石在煅烧后反应效果最好,H2产率提高20%以上。在添加2%K2CO3基础上,进一步研究得到:在不同的水油比实验中,水蒸气重整反应最佳水油比从7.5降低到4.7;在不同的重整反应温度下,添加钾元素的煅烧白云石吸收剂在600℃下吸收效果最佳。

In order to enhance the hydrogen product yield and content, the effects of dropping alkali metal K to dolomite sorbents in the steam reforming of bio-oil aqueous fraction coupled with in situ carbon dioxide capture for hydrogen production was studied. It showed that the steam reforming was obviously promoted by K2CO3 in dolomite sorbents, and the hydrogen product yield was raised by more than 20 percent points on the K2CO3 content of 2wt%. The experiments in different water to bio-oil ratios showed that the best ratio is decreased from 7.5 to 4.7as the result of dropping alkali metal K, and the best temperate for the CO2 adsorption on the modified sorbents is near 600℃.