Table S2 displays the Box–Behnken experimental results for the
yields of the aqueous products, as well as the TOC with xylan as
the feedstock under various reaction conditions. The data analysis revealed that temperature and catalyst loading amount had the
greatest effects on xylan conversion. Practically, less lactic acid was
formed when the catalyst level was low even at high temperatures.
Contrarily, at a high ratio of ZrO2 to xylan, a significant amount
of lactic acid was formed even at the low reaction temperature of
180 ◦C. Reaction time also appeared to be a variable that affects the
lactic acid yield, and the longer reaction times, the higher yields.