热解炭在线催化玉米秆热解实验研究

STUDY ON ONLINE CATALYTIC PYROLYSIS OF CORN STALK USING PYROLYTIC CHAR

为探索一种更适用的催化剂,将热解炭用于玉米秆热解挥发分的在线催化。研究结果表明,虽然生物油产率有所下降,但可降低生物油中的酸类物质含量,而酚类物质含量则显著增加。在实验条件下,酚类物质的相对含量可达55%以上。通过比较热解炭脱灰前后及不同添加量的催化效果,发现热解炭表面的碱性位能吸附挥发分中的酸类物质,使其一部分发生中和,另一部分被裂解成小分子气体,从而降低生物油中的酸类物质含量,而热解炭中的碱和碱土金属对生物油中的酚类物质的富集有明显的促进作用。

Online catalytic pyrolysis is an effective way to promote the quality of bio-oil except that the existing catalyst is easily deactivated and a regeneration is necessary. In order to explore a more suitable catalyst,pyrolytic char was used to catalyze the pyrolysis volatile of corn stalk online in this study. The results showed that the yield of bio-oil declined,but the content of acids in bio-oil was decreased accordingly,while the content of phenols had a significant increase. The highest relative content of phenols reached up to more than 55% under the experimental conditions. By comparing the catalytic effects of chars with different dose,before and after deashing,it was revealed that the basic sites on the surface of char can adsorb acids in the volatile and neutralize some acids or crack some acids into gas,which decrease the content of acids in bio-oil. Besides,as proved,the alkali and alkaline earth metals in char can promote the production of phenols.