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CeO2-La2O3/ZSM-5 sorbents for high-temperature H2S removal
Jiang Wu,Weiguo Zhou,Dongjing Liu 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.6
Performance of CeO2-La2O3/ZSM-5 sorbents for sulfur removal was examined at temperature ranging from 500 oC to 700 oC. The sulfur capacity of 5Ce5La/ZSM-5 was much bigger than that of CeO2/ZSM-5. H2 had a negative impact on the sulfidation; however, CO had little influence on sulfur removal. The characterization results showed that CeO2 and La2O3 were well dispersed on ZSM-5 because of the intimate admixing of La2O3 and CeO2, the major sulfidation products were Ce2O2S and La2O2S, the XRD and SEM results revealed that ZSM-5 structure could remain intact during preparation and sulfidation process, the H2-TPR showed that the reducibility of CeO2 can be remarkably enhanced by addition of La.
Yang Ling,Jiang Wu,Lingtao Yang,Dongjing Liu 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.6
The emission of mercury from anthropogenic activities is a serious concern in both developed and developingcountries due to its high toxicity and persistence. Here, carbon nitride nanosheets (CNNS) were attained via atwo-step thermal etching method and applied for Hg0 removal. Proper deposition of ZnS can markedly reinforce the Hg0capture ability of CNNS. 10ZnS/CNNS notably outperforms ZnS and CNNS at 100 oC, which is primarily attributed tosurface chemisorbed oxygen species and polysulfide active sites. Besides, Hg0 adsorption and thermal catalytic oxidationpathways are further disclosed using quantum chemistry calculations based on density functional theory (DFT). The calculation results show that the presence of zinc species is beneficial to the decomposition of adsorbed oxygen,which plays a key role in the catalytic oxidation of Hg0, thereby contributing to the enhancement of mercury removalperformance.