Hydrogen production from iron sulphate photolysis using mark-5 cycle

Abstract

ABSTRACT Hydrogen production was carried out in a photochemical device in a Mark-5 cycle. The photolysis of iron sulphate solution was carried out in a close periodic system. The reaction mixture was 8.5 g iron sulphate compound (FeSO4•7 H2O), 2.5 g I2 and 1.0 g HI in 100 mL water. Fifty millilitres of this solution was filled into a quartz reactor and connected to cycle system. The optimisation of hydrogen production was achieved by temperature, flow rate and radiation irradiation. The maximum hydrogen generated was 50.0 × 1016 molecules per minute at 120 °C temperature, 0.08 mL/sec. Pump speed, pressure 0.30 MPas, and Hg-vapour λmax = 365 nm. Eact. = 14.92 kC/mol caused bimolecular reactions to occur at low temperatures by photochemical action. Quantum yield of hydrogen depended on the absorbed of 0.5 × 1015 kvant/s. The energy of the quantum above T ≥ 100°C temperatures was φ ≥ 1. The dependence of the hydrogen generation rate (W) increased from 0.001 to 0.0038 × 1016 molecules/sec at 10-90 minutes, respectively.