Effect of chelating ligands on Ni–Mo impregnation over wide-pore ZrO2–TiO2

Escobar, José; Barrera, María C.; Reyes, J.A. de los; Toledo, J. A.; Santes, Vı́ctor; Colín, José A.

doi:10.1016/j.molcata.2008.02.022

Cited by 75 publications

(31 citation statements)

References 38 publications

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“…1), where no characteristic peaks of metallic Pd or its oxides were detected in all supported Pt-Pd catalysts. However, consistent with both is that the Pd particles may be well-dispersed or comprised of small crystals amorphous to the X-ray radiation [42,43]. Indeed, SEM-EDX analysis revealed that the quantity of Pt in all supported PtPd catalysts was smaller than the quantity of Pd (Table 2).…”

Section: Pt-pd/hbsupporting

confidence: 60%

Effect of supports on activity and stability of Pt–Pd catalysts for oxygen reduction reaction in proton exchange membrane fuel cells

Limpattayanate

Hunsom

2013

J Solid State Electrochem

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The platinum-palladium alloy (Pt-Pd) catalysts were prepared on various supports including Vulcan XC72, Hicon Black (HB), multiwalled carbon nanotubes (MWCNTs), and titanium dioxide (TiO 2 ) by a combined approach of impregnation and seeding using NaBH 4 reduction at low temperature. Their oxygen reduction reaction (ORR) activities in single proton exchange membrane fuel cell (PEMFC) under a H 2 /O 2 environment and their stability in an acid electrolyte (0.5 M H 2 SO 4 ) were tested and compared with the Vulcan XC72-supported Pt (Pt/C) catalysts. The presence of the Pd metal as well as different types of supports affected the ORR activity in H 2 /O 2 environment and stability in the acid electrolyte. Overall, the HB-supported Pt-Pd (Pt-Pd/HB) catalysts provided the highest current density at 0.6 V under a H 2 /O 2 environment, while the MWCNT-supported Pt-Pd (PtPd/MWCNT) catalyst provided the best stability in an acid electrolyte.

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Section: Pt-pd/hbsupporting

confidence: 60%

Effect of supports on activity and stability of Pt–Pd catalysts for oxygen reduction reaction in proton exchange membrane fuel cells

Limpattayanate

Hunsom

2013

J Solid State Electrochem

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“…The HDS kinetic constant over the catalysts increases in the following order of supports: alumina < C 2 < C 3 < C 1 . In [34] the case of catalysts with the complexing agent, the corresponding kinetic constant decreases in the following CYDTA/ Co mole ratio order: 1.2 > 1.8 > 0.6. Finally, the activity of the best sample, Y 1.2 C 1 , from the present work is higher than a commercial catalyst, PCoMo/Al 2 O 3 (sample S-4 in Tab.…”

Section: Discussionmentioning

confidence: 97%

Hydrodesulfurization‐Supported Catalysts: Effect of the Preparation Method

Moradi

Parvari

2011

Chem Eng & Technol

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Hydrodesulfurization (HDS) of dibenzothiophene in a batch reactor was performed at 5.5 MPa and 320°C on CoMoS/Al 2 O 3 -TiO 2 using trans-1,2-cyclohexanediamine-N,N,N′,N′-tetraacetic acid (CYDTA) as a complexing agent for the preparation method. The effects of titania, concentration of CYDTA, and preparation procedure were investigated by using X-ray diffraction, BET, Fourier transform infrared spectroscopy, and temperature-programmed desorption of ammonia experiments. The catalyst prepared by impregnation with c-alumina and titanium isopropoxide as raw materials and a CYDTA/Co mole ratio of 1.2 provided an HDS activity (on a pseudo-first-order kinetic constant basis) value ∼3.8 times higher compared to that of a CoMo/Al 2 O 3 catalyst.

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“…Therefore, several attempts were performed to enhance the photocatalytic activity of TiO 2 . These include doping of transition metals into the surface of TiO 2 (Nahar, Hasegawa, Kagaya, & Kuroda, 2007;Wang, Ye, Wu, & Hu, 2008), acid pre-treatment of the anatase surface (Colon, Sanchez-Espana, Hidalgo, & Navio, 2006), impregnation with different dyestuff and complexes (Escobar, et al, 2008;Kawamura, Okuto, Taruta, Takusagawa, & Kitajima, 1996;Moon, Yun, Chung, Kang, & Yi, 2003), modification with other semiconductors (Ma, Brown, Howe, Overbury, & Dai, 2008) or supporting on surface of activated carbon, aluminosilicates and zeolite (Gan, Liu, Zhang, & Chen, 2008;Jayasankar, Ananthakumar, Mukundan, Wunderlich, & Warrier, 2008;Mahalakshmi, Vishnu Priya, Arabindoo, Palanichamy, & Murugesan, 2008;Razavi, Rahimipour, & Kaboli, 2008;Yang, Liu, Yang, & Yu, 2008).…”

Section: Ho Andmentioning

confidence: 99%

Photocatalytic Degradation of Phenol using Fe-TiO2 by Different Illumination Sources

Shawabkeh¹,

Khashman²,

Bisharat³

2010

IJC

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A Fe-doped titanium dioxide (Fe-TiO 2 ) was prepared using hydrothermal method and used for degradation of phenol from aqueous solution. The samples were characterized by X-ray diffraction (XRD) and showed a presence of both TiO 2 and Fe 2 O 3 peaks. The photocatalytic activity of Fe-TiO 2 catalyst was evaluated for oxidation of phenol in aqueous solution using different illumination sources. Visible light irradiation from sun, UV light sources with 190 and 390 nm, fluorescence and dark environment were used and found that the degradation of phenol was in the order of 7.8%, 12%, 7.5%, 6.8% and 5% obtained after 24 h, respectively. It was found that the increase in exposure time to UV, the increase in solution temperature and pH have increased the rate of phenol degradation in solution. This rate was best fitted using first order kinetic model with reaction constant of 3 10 268 . 6 − × .

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Effect of chelating ligands on Ni–Mo impregnation over wide-pore ZrO2–TiO2

Cited by 75 publications

References 38 publications

Effect of supports on activity and stability of Pt–Pd catalysts for oxygen reduction reaction in proton exchange membrane fuel cells

Effect of supports on activity and stability of Pt–Pd catalysts for oxygen reduction reaction in proton exchange membrane fuel cells

Hydrodesulfurization‐Supported Catalysts: Effect of the Preparation Method

Photocatalytic Degradation of Phenol using Fe-TiO2 by Different Illumination Sources

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