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Wang W.,Dalian University of Technology | Wang W.,Yinchuan Energy Institute | Wang A.-J.,Dalian University of Technology | Wang A.-J.,Liaoning Key Laboratory of Petrochemical Technology and Equipment | And 3 more authors.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2015

The bulk Ni2P was synthesized by means of hydrogen plasma reduction (PR). A mixture of 10% H2S in Ar was used to passivate the freshly-synthesized Ni2P to protect their crystal structures before entering the fixed bed reactor. The experimental results show that their catalytic performances are higher in the hydrodesulfurization (HDS) than those prepared by the conventional temperature-programmed reduction (TPR) method. XRD characterization results reveal that there exist more active sites in the PR-synthesized Ni2P than in the TPR-synthesized ones due to the decreased particle sizes of the PR-synthesized Ni2P. The PR-synthesized Ni2P exhibits a good stability during HDS reaction. ©, 2015, Editorial Office of Chemical Engineering (China). All right reserved. Source


Yu Z.,Dalian University of Technology | Wang F.,Dalian University of Technology | Xu X.,Dalian University of Technology | Wang Y.,Dalian University of Technology | And 5 more authors.
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | Year: 2015

Pd/Hβ and Pd/Ce-β (1%, mass fraction) were prepared by the incipient impregnation method. Their catalytic performances in aqueous-phase hydrodeoxygenation (HDO) of phenol were investigated with a model fuel containing 5.0% (mass fraction) phenol in water as raw material. It was found that the hydrogenation of cyclohexanone to cyclohexanol was the rate-determining step in the aqueous-phase HDO of phenol. Bi-cyclohexane was generated from the alkylation of cyclohexanone with cyclohexanol. Pd/Ce-β showed higher HDO activity than Pd/Hβ, meaning that Ce modification of β can enhance the hydrogenation activity and suppress the alkylation reactivity of the Pd supported catalyst. ©, 2015, Science Press. All right reserved. Source


Teng Y.,Dalian University of Technology | Wang A.-J.,Dalian University of Technology | Wang A.-J.,Liaoning Key Laboratory of Petrochemical Technology and Equipment | Li X.,Dalian University of Technology | And 4 more authors.
Dalian Ligong Daxue Xuebao/Journal of Dalian University of Technology | Year: 2010

MCM-41-supported Ni2P, MoP and WP catalysts were prepared by an in-situ temperature programmed reduction method from their oxide precursors and characterized by XRD and CO chemisorption. The hydrodesulfurization (HDS) performances of the three catalysts were evaluated using a model fuel containing 0.8% dibenzothionphene (DBT) in decalin. The results indicate that MCM-41-supported Ni2P catalyst shows the highest HDS performance, exhibiting the highest HDS reaction rate constant and TOF, while WP/MCM-41 is the lowest. The HDS reaction routes over the three catalysts exhibit different trends towards different temperatures. The presence of H2S in the feed significantly suppresses the hydrogenation pathway of Ni2P/MCM-41, and leads to a drastic decrease in the HDS activity. MoP/MCM-41 exhibits better sulfur resistance compared with other catalysts. Source


Wang A.-J.,Dalian University of Technology | Wang A.-J.,Liaoning Key Laboratory of Petrochemical Technology and Equipment | Wang Y.,Dalian University of Technology | Wang Y.,Liaoning Key Laboratory of Petrochemical Technology and Equipment | And 6 more authors.
Dalian Ligong Daxue Xuebao/Journal of Dalian University of Technology | Year: 2016

With the dwindling of fossil energy, much attention has been paid to the research of renewable bio-oil from lignocellulose biomass. Compared with the petroleum, the high oxygen content imparts some disadvantages to the bio-oil, such as low energy density, high viscosity, poor thermal and chemical stability. The bio-oil must be further deoxygenated to supply the conventional engine fuel. Hydrodeoxygenation (HDO) is the most common and promising method to upgrade bio-oil. The development of HDO catalyst for lignocellulose bio-oil, including transition metal sulfide, phosphide, nitride and carbide, noble metal, "metal-acid" bi-functional catalyst, transition metal and amorphous alloy, is reviewed. Over transition metal sulfide, the sulfur might be replaced by oxygen from oxygenates and water, leading to the deactivation. Noble metal possesses higher HDO activity and product selectivities, whereas the high cost and less resources suppress the large-scale industrial application. Transition metal nitride, carbide and transition metal have been shown to hydrodeoxygenate bio-oil effectively, but the oxygen accumulation and carbon deposition might lead to the deactivation. Despite the high HDO activity of amorphous alloy, the thermostability is poor. However, transition metal phosphide attracts more attention, due to the high HDO activity and good stability. The support effect is summarized as surface properties and pore structure. Moreover, carbon deposition and structure damage are the main causes of catalyst deactivation. © 2016, Editorial Office of Journal of Dalian University of Technology. All right reserved. Source


Li X.,Dalian University of Technology | Li X.,Liaoning Key Laboratory of Petrochemical Technology and Equipment | Zhu H.,Liaoning Key Laboratory of Petrochemical Technology and Equipment | Wang A.,Dalian University of Technology | And 4 more authors.
Chemistry Letters | Year: 2013

WO3/γ-Al2O3 exhibited a lower activity than WO3/SiO2 in oxidative desulfurization (ODS) of dibenzothiophene using cumene hydroperoxide as the oxidant. This could be a result of the strong interaction between WO3 and γ-Al 2O3. The crystalline WO3 was more active than the tetrahedrally coordinated tungsten oxide species bound on the surface of γ- Al2O3. The loss of WO3 was negligible for WO3/SiO2 after the reaction. These features make SiO2 a promising support for the supported WO3 ODS catalyst. © 2013 The Chemical Society of Japan. Source

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