A series of coal-based active carbon(AC) catalysts loaded by Fe-Cu,Fe-Cu-Ce and Fe-Cu-La were prepared by the sol-gel method for carbon disulfide(CS2) hydrolysis and their performances for CS2 hydrolysis in a fixed-bed reactor were investigated in this work.The results showed that the kind of rare earth oxide and its content had obvious effect on hydrolysis removal of CS2.The effects of temperature,space velocity,CS2 concentration and O2 concentration were also discussed respectively.Furthermore,the suitable operating conditions were obtained.It was found that the poisoning of hydrolysis active sites could result in the formation of sulfuric acid on the catalyst surface.
Fe/Cu/Ce modified coal-based activated carbon(AC) was prepared by the sol-gel method,and the effect of Fe/Cu/Ce on catalytic properties of Fe/AC,Fe-Cu/AC and Fe-Cu-Ce/AC was investigated in the hydrolysis of carbonyl sulfide(COS) at 50 °C.Their surface properties were evaluated by means of nitrogen adsorption and were characterized by using scanning electron microscopy(SEM),X-ray diffracto-metry(XRD) and X-ray photoelectron spectroscopy(XPS).The catalytic activities results showed that addition of Cu and Ce could enhance the activities of COS hydrolysis and Fe-Cu-Ce/AC with n(Fe):n(Ce)=20 exhibited a higher stability.The XRD and XPS results revealed that Cu loading controlled the crystalline phases and Ce could affect the crystalline phase of Fe2O3 and change the products formation and content of SO42-.
A novel type of metal oxide/activated carbon catalyst was prepared by sol-gel method for the hydrolysis of carbonyl sulfide(COS) .The influences of the calcination temperature,additive content(2.5%-10.0%Fe2O3,mass fraction) and the basic density of the activation process were thoroughly investigated.The surface of catalysts was characterized by Boehm titration.The products were characterized by scanning electron microscopy(SEM) ,X-ray diffractometry(XRD) and X-ray photoelectron spectroscopy(XPS) .The results show that catalysts with 2.5%-5.0%Fe2O3 after calcining at 500℃have superior activity.The conversion rate of COS increases with increasing the relative density of basic capacity loaded onto activated carbon(AC) ,and the activity follows the order:KOH>Na2CO3>NaHCO3.Boehm titration data clearly show that the total acidity increases(from 0.06 to 0.48 mmol/g) and the basic groups decrease(from 0.78 to 0.56 mmol/g) after COS hydrolysis and H2S adsorption.The XPS results show that the product of H2S may be absorbed by the interaction with metal compounds and O2 to form sulfate(171.28 eV) and element sulfur(164.44 eV) ,which lead to catalysts poisoning.
