Effects of cellulose addition on sodium lignosulfonate pyrolysis: Product distribution and formation pathway

Abstract

Copyrolysis of lignin and cellulose can effectively improve pore structure and optimize product distribution. Therefore, the distribution, characteristics, components, and formation mechanism of the copyrolysis products of cellulose and sodium lignosulfonate were studied. The pyrolysis of sodium lignosulfonate was effectively inhibited by cellulose, especially when the amount of doped cellulose was 40 wt.%, and tubes presumed to be carbon nanotubes were prepared under these conditions. For bio‐oil, the contents of phenol, 2‐methoxy‐, and 4‐aminopyridine increased with decreasing amounts of doped cellulose. However, cellulose substantially reduced the content of 2‐furanmethanol. H2, CO2, CO, and CH4 were the main components of the biogas; among them, H2 was the most abundant component in the biogas. Considering the characteristics of the three‐phase product, a higher C content in the volatiles (especially bio‐oil) can promote the formation of carbon nanotubes. Finally, the formation mechanism and interactions of the main components in the volatiles of cellulose and sodium lignosulfonate were proposed.