水热法合成催化氧化高含硫废水的Ni-MnO2/Al2O3制备条件优化OA

To meet the requirement of rapid oxidation treatment of high sulfur wastewater in oil and gas fields,Ni-MnO2/Al2O3 catalysts were prepared using the hydrothermal method with Ni as a metal additive and MnO2 as the active component.The preparation conditions of Ni-MnO2/Al2O3 were optimized by studying its catalytic oxidation performance on high sulfur wastewater.Characterization results from BET,XPS,and SEM showed that the molar ratio of Ni to Mn significantly affected the specific surface area of the catalyst,reaching a maximum of 232.5 m2/g at a ratio of 2∶10,with a high ratio of adsorbed to lattice oxygen at 2.02.The hydrothermal temperature influenced the catalyst's morphology,forming rod-like structures at low temperatures and ordered sheet structures at 110℃,while excessive temperatures caused grain aggregation.The high catalytic activity is attributed to the large specific surface area,rich porous structure,and high adsorbed oxygen content.The catalyst prepared under the conditions of a Ni to Mn molar ratio of 2∶10,hydrothermal temperature of 110℃,hydrothermal time of 12 hours,and calcination temperature of 400℃ exhibited the highest catalytic activity,with a sulfur ion conversion rate of 96.6％for wastewater with a sulfur ion concentration of 3 000 mg/L.