Investigation of products characteristics from microwave catalytic pyrolysis of furfural residue based on the effects of Fe/Mn modified biochar

In this paper, the effect of MnCl2 and FeCl3 modified biochar catalysts on the catalytic pyrolysis products of furfural residue (FR) under microwave field was investigated. The results showed that the highest content in the pyrolysis gas obtained from microwave catalytic pyrolysis (MCP) with modified biochar catalysts was CO, while phenols were found in bio-oil. After metal loading, the specific surface area of the catalyst decreased significantly. The CO production was promoted by microwave pyrolysis of FR over modified biochar catalyst, and MFRC gain was more obvious. The content of H2 all continued to increase with increasing mass of loaded metals, and the opposite was true for CO. The highest relative content of phenols in the bio-oils of FFRC and MFRC were 66.76 % for 2FFRC and 63.66 % for 4MFRC, where the relative content of phenols was 15.50 % and 19.27 %, respectively. The production of sugars and ketones was also promoted by Fe and Mn. The lower loading of active metals significantly promoted the conversion of pyrolysis vapors to phenols while releasing more CO. A possible mechanism of MCP of FR was proposed. The results showed that Fe/Mn-modified char-based catalysts could effectively modulate the composition of bio-oil. © 2024