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- 저자 : Gao Ruiyao (검색결과 2 건)
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Effects of Pyrolyzing and Phosphiding on Dibenzothiophene Hydrodesulfurization of MOF-Derived Ni2P
Liu Yanyan,Wang Zhiheng,Li Xin,Gao Ruiyao,Sun Jiong,Liu Jiankun,Yao Songdong 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.6
To investigate the potential utilization of MOF templates in hydrodesulfurization (HDS) of large sulfur-containing compounds, MOF-derived Ni 2 P was prepared and characterized by XRD, TG, SEM, TEM, XPS and Raman. The fi ndings indicate that MOF-derived Ni 2 P catalyst exhibits signifi cantly enhanced Hydrodesulfurization (HDS) activity compared to conventional unsupported Ni 2 P. A modifi ed pyrolysis and phosphiding condition allowed the stacking of central Ni atoms to be aggregated loosely, and morphology of MOF-derived Ni 2 P can be controllably transmitted from polyhedral to petal-like. A lower pyrolysis temperature tends to reduce density of Ni aggregates and cluster size of Ni 2 P(111), thereby facilitating the phosphiding of Ni aggregates and enhancing the catalytic activity of MOF-derived Ni 2 P in HDS process. Increasing the duration time of pyrolysis at lower temperatures does not accelerate the aggregation of particles, but makes petals on surface of MOF-derived Ni become thinner and eventually disappear, until coral-like nanosphere aggregates with uniform size are formed. The gradually elimination of MOF framework renders nickel aggregates more susceptible to phosphiding. The collapse of pore structure of MOF template can impact HDS activity of MOF-derived Ni 2 P. Prolonging pyrolysis time causes the spacing between Ni 2 P clusters to diminish, thereby signifi cantly decreasing reactivity of Ni 2 P-400-4-275 compared to Ni 2 P-400-2-275 in DBT–HDS.
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Yanzeng Dong,Xiaohang Yu,Zhiheng Wang,Xin Liu,Yanyan Liu,Ruiyao Gao,Songdong Yao 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
Effects of HY addition on NiMoS active phase of NiMo(NH3) impregnated NiMo/Al2O3-HY and its role in4,6-dimethyl-dibenzothiophene hydrodesulfurization was investigated. The results show that HY canpromote HDS reaction by changing the morphology of NiMoS nanoclusters even when isomerization of4,6-DMDBT is not involved. In the absence of strong acid sites, TOF of NiMo/Al2O3 catalyst was stillimproved by 90%. XRD, H2-TPR, Raman, TEM, and XPS characterization show that proper metal supportinteraction caused by HY addition is beneficial to the formation of large-scale multilayer NiNoS clusters,the enrichment of Ni in NiMoS clusters and the increase of NiMoS active sites, thereby leading HDS catalystexhibiting highest intrinsic activity (TOF). However, too strong or too weak metal support interactionwill reduce intrinsic activity for HDS catalysts. When pH value of impregnation solution is 10, thestrong metal support interaction reduces layer numbers of NiMoS clusters. When pH value of impregnationsolution is 11, negative charge hinders the formation of NiMoS clusters. This not only leads to a furtherdecrease HYD pathway selectivity, but also significantly reduces the initial reaction rate of HDScatalyst.
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