Molecular-level structures and distribution of refractory polycyclic aromatic sulfur heterocycles (PASHs) during residue hydrotreating process (RHT) are investigated. A prior atmospheric pressure photoionization (APPI) FT-ICR MS was used to obtain…
Only trace amounts of sulfur (tens to thousands of ppm) are present in bio-oils produced from fast pyrolysis of lignocellulosic biomass. However, even such small amounts of sulfur-containing compounds can act as catalytic poisons during bio-oil…