| A series of V2O5 doped Ti-Ce-pillared interlayeredclays(V2O5/Ti-Ce-PILCs)were prepared and characterized using X-ray diffraction(XRD),surface area-pore volume measurements,Fourier Transform Infrared(FT-IR)spectroscopy,X-ray photoelectron spectroscopy(XPS),temperature-programmed reduction by H2(H2-TPR),thermogravimetric(TG)analysis,temperature-programmed desorption of ammonia(NH3-TPD)TEM,SEM and XRF.(1)The interaction of V2O5、TiO2、CeO2 plays a role on the catalytic performance of the catalysts.CeO2 helps increase the thermostability of catalyst and provided more lattice oxygen which enhanced redox of V2O5 and decreased the favored operation temperature.The addition of TiO2 postponed the catalyst deactivation owing to the reoxidation of VOx、CeOx,and retarded the catalyst deactivation resulted from sulfate coverage.(2)Surfactants had a strong interaction with the pillars,and the chemical composition and crystal structure of PILC catalysts,as well as their pore structure was affected.The content and distribution state of pillars could be tailored by the choice of the surfactants and adjusting the amount of the surfactants added.(3)O2/H2S ratio of reaction impacts on the catalytic performance of the catalysts.CeO2 could promote the formation of chemisorbed oxygen,release and store the lattice oxygen to reduce the deactivation rate of catalysts.The O2/H2S ratio was tightly related to the H2S conversion and selectivity of catalysts.The experimental results indicated that the PILCs catalysts modified by PEO surfactants with a Ti/PEO ratio of 30 mmol· g-1 at O2/H2S ratio of 0.75 showed very good catalytic performance in selective catalytic oxidation of H2S at 180℃.And the H2S conversion rate can reach 98%.(4)As poor analysis of the relationship between the intermediums(pillaring agent)and surfactants with experiments and characterization,a molecular dynamics study was performed to analyze the interaction energy between pillaring agent and surfactants. |
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