Preparation of Co–Mo/B2O3/Al2O3 catalysts for hydrodesulfurization: Effect of citric acid addition

Rinaldi, Nino; Usman, .; Al-Dalama, Khalida; Kubota, Takeshi; Okamoto, Yasuaki

doi:10.1016/j.apcata.2009.03.006

Cited by 63 publications

(37 citation statements)

References 41 publications

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“…The use of these compounds for improving the final activity of HDS catalysts was reported in patents [20,21] and in several academic studies [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. On silica support, Niemantsverdriet and co-workers [23][24][25][26][27] have studied the role of NTA (nitrilotriacetic acid), EDTA (ethylenediaminetetraacetic acid), and CyDTA (1,2-cyclohexanediamine-N, N, N 0 , N 0 -tetraacetic acid) on CoMo, NiMo, NiW and CoW catalysts.…”

Section: Introductionmentioning

confidence: 97%

Maleic acid, an efficient additive for the activation of regenerated CoMo/Al2O3 hydrotreating catalysts

Bui

Geantet

Berhault

2015

Journal of Catalysis

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Section: Introductionmentioning

confidence: 97%

Maleic acid, an efficient additive for the activation of regenerated CoMo/Al2O3 hydrotreating catalysts

Bui

Geantet

Berhault

2015

Journal of Catalysis

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“…The preparation of highly active CoMo-based HDS catalysts has been widely investigated, such as Timodification of Al2O3 support 1) , Co-CVD technique 2), 3) , and addition of chelating agents 4), 5) , citric acid 6) and phosphorus 3),7), 8) . Furthermore, new active phases, not sulfided CoMo catalysts, have been reported by many researchers.…”

Section: Introductionmentioning

confidence: 99%

Effects of Support on Formation of Active Sites and Hydrodesulfurization Activity of Rhodium Phosphide Catalyst

Kanda

Nakata

Temma

et al. 2012

J. Jpn. Petrol. Inst.

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The effects of the support on active site formation and hydrodesulfurization (HDS) activity of Rh2P catalyst were examined, using metal oxides (MOx), such as SiO2, TiO2, Al2O3, MgO and ZrO2, as the support. Rh2P was formed on MOx support after reduction of supported rhodium and phosphorus (Rh _ P) catalysts. However, differences in the formation temperatures of Rh2P were observed by changing the MOx support. Furthermore, the HDS activities of the supported Rh _ P catalysts strongly changed with higher reduction temperature. The order of HDS activities of Rh _ P/MOx catalysts reduced at optimal temperatures was SiO2 ~ TiO2 ~ Al2O3 MgO ZrO2. The TOF of Rh _ P/MOx catalysts was enhanced by increasing the reduction temperature to form Rh2P. The order of TOF of supported Rh2P catalysts was TiO2 ZrO2 Al2O3 SiO2 MgO, and this order disagreed with that of thiophene conversion. The high TOF of Rh _ P/TiO2 catalyst may be explained by formation of partially sulfided TiO2 in the HDS reaction. The low TOF of Rh _ P/MgO catalyst was attributed to the basicity of the support with low sulfur tolerance.

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“…Addition of citric acid increased the activity of TiO2 _ ZrO2-supported Ni _ Mo catalysts for the HDS of dibenzothiophene 14) . Addition of citric acid to a simultaneous impregnation solution also increased the HDS activity of Co _ Mo/Al2O3 and Co _ Mo/B2O3/Al2O3 catalysts, possibly by increasing the dispersion of MoS2 particles as well as the increased Co coverage of the MoS2 edges 15) . X-ray photoelectron spectroscopy (XPS) showed that the sulfidation of Mo is improved by the addition of citric acid 11), 16) .…”

Section: Introductionmentioning

confidence: 95%

Hydrodesulfurization Activity of Co–Mo/Al<sub>2</sub>O<sub>3</sub> Catalysts Prepared with Citric Acid: Post-treatment of Calcined Catalysts with High Mo Loading

Rinaldi

政裕

岳志

et al. 2010

J. Jpn. Petrol. Inst.

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Co _ Mo/Al2O3 catalysts with high loading of Mo (20 wt% Mo) were prepared by the addition of citric acid (CA) using a simultaneous impregnation method or a post-treatment method. The catalyst activity was investigated for the hydrodesulfurization (HDS) of dibenzothiophene. TEM, Co K-edge XANES, NO adsorption capacity, and surface area measurements were conducted to characterize the catalysts. The catalysts were also investigated by the chemical vapor deposition technique using Co(CO)3NO to prepare Co/MoS2 and Co/Co _ MoS2 catalysts. Addition of citric acid by the post-treatment method to calcined (Co) _ Mo/Al2O3 oxide catalysts significantly enhanced the edge dispersion of MoS2 particles and the catalytic activity of Co/Mo/Al2O3 and Co _ Mo/Al2O3, whereas citric acid addition by the simultaneous impregnation method hardly affected the edge dispersion. The highest HDS activity was obtained with a CA/Mo mole ratio of 1.5-2 for the post-treatment catalysts. The posttreatment method may be applicable to the regeneration of deactivated HDS catalysts.

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Preparation of Co–Mo/B2O3/Al2O3 catalysts for hydrodesulfurization: Effect of citric acid addition

Cited by 63 publications

References 41 publications

Maleic acid, an efficient additive for the activation of regenerated CoMo/Al2O3 hydrotreating catalysts

Maleic acid, an efficient additive for the activation of regenerated CoMo/Al2O3 hydrotreating catalysts

Effects of Support on Formation of Active Sites and Hydrodesulfurization Activity of Rhodium Phosphide Catalyst

Hydrodesulfurization Activity of Co–Mo/Al<sub>2</sub>O<sub>3</sub> Catalysts Prepared with Citric Acid: Post-treatment of Calcined Catalysts with High Mo Loading

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