Browsing by Author "Xue Xiaojun"

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    Rational construction and reaction mechanism of bimetal oxides/carbon nanofibers sorbent for H2S removal at high temperature
    (Elsevier, 2025) Mishra Ajay; Xue Xiaojun; Li, Zidan
    Incorporation of decentralized active components with high loadings holds significant potential to enhance mass transfer efficiency and H2S affinity of sorbent during desulfurization. Consequently, this study focuses on developing composited metal oxides desulfurization sorbents utilizing carbon nanofibers (CNFs) as a structural support matrix for coal gas desulfurization. Electrospinning, hydrothermal growth and thermal treatment were employed to fabricate sorbents, the metal species were precisely controlled to synthesize ZnX/CNFs (X = Co, Fe, Ni, Cu) sorbents. The obtained sorbents characterized by methods including microscopic morphological analysis, compositional examination, and evaluation of their desulfurization performance. Comparative evaluation of transition metal-doped composites demonstrated significant variations in sulfur capacity, with ZnCo/CNF exhibiting superior performance at 12.42 g S/100 g sorbent, followed by ZnCu/CNF (8.24 g S/100 g sorbent), ZnFe/CNF (7.03 g S/100 g sorbent), and ZnNi/CNF (2.23 g S/100 g sorbent). The ZnX-ZIF/PAN displayed different phase transition rates in hydrothermal as referring to the metal types, leading to substantial variations in size and morphology of ZnX-ZIF nanoparticles, which resulted in differences in various active component contents. It is also worth noting the Kirkendall effect was triggered and led to the formation of hollow metal oxide structure that facilitated the desulfurization. The superior activity, dispersion and high loading of activecomponents in ZnCo/CNFs attributed to its increased mass transfer rate and promoted performance.