Abstract
This research investigates hydrogen production from urban pruning waste biomass through combined hydrothermal treatment and aqueous phase reforming. Optimization of treatment parameters (temperature, time and pH) yielded a hydrolysate rich in water-soluble compounds. The most effective conditions were found at 180 °C and 60 min, achieving a balanced hydrolysis and solubilization of lignocellulosic waste. Low pH, induced by organic acids from the waste, drove hydrotreatment, but further acid addition hindered solubilization. Aqueous phase reforming at 220 °C with a carbon-supported Pt catalyst resulted in enhanced carbon conversion and H2 production at an initial carbon concentration of 1,000 mg/L. Increasing Pt load from 3 to 5 % wt. improved production and selectivity, plateauing at 7.5 % wt. Optimal conditions demonstrated a H2 production of 17 mmol per gram of dissolved organic carbon, affirming the viability of this scheme for pruning waste valorization.
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