Elucidating the role of NiMoS-USY during the hydrotreatment of Kraft lignin

Major hurdles in Kraft lignin valorization require selective cleavage of etheric and C–C linkages subsequent stabilization the fragments to suppress repolymerization reactions yield higher monomeric fractions. In this regard, we report development efficient NiMo sulfides ultra-stable Y zeolites for reductive liquefaction hydrodeoxygenation a Parr autoclave reactor at 400 °C 35 bar H2 (@25 °C). Comparing activity test without/with catalyst, it is revealed that over (silica/alumina = 30) achieved significant reduction (∼50 %) re-polymerized solid residue fraction leading detectable liquid product 30.5 wt% with notable monocyclic alkylbenzenes selectivity (∼61 wt%). A physical mixture counterpart, consisting hydrothermally synthesized unsupported NiMoS Y30, on other hand, shows lower such fractions but due enhanced access active sites. Moreover, an extended reaction time catalyst loading impregnated NiMoY30 facilitated remarkable alkylbenzene (72 wt%) increased 38.9 reduced 16.4 wt%. The reason high NiMoY30, according characterization (H2-TPR, XPS, TEM) can be ascribed depolymerized via H2-activation temperature ability. addition, better proximity acidic deoxygenation sites was beneficial suppressing formation polycyclic aromatics.