Effect of support type on the magnitude of synergism and promotion in CoMo sulphide hydrodesulphurisation catalyst

Kaluža, Luděk; Gulková, Daniela; Vı́t, Zdeněk; Zdražil, Miroslav

doi:10.1016/j.apcata.2007.02.050

Cited by 69 publications

(22 citation statements)

References 12 publications

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“…Furthermore, the H 2 consumption peak of Co oxide does not individually appear in TPR profiles, which is in accordance with the results of studies by Zhang et al [14,17,18]. They reported that the TPR curves arising from the Co-Mo catalysts were always similar to that of the Mo sample alone and that the peak of Co was suppressed.…”

Section: Tpr Studiessupporting

confidence: 92%

Catalytic performance of Co-Mo-Ce-K/γ-Al2O3 catalyst for the shift reaction of CO in coke oven gas

Zhao

Zhang

2010

Front. Chem. Eng. China

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The catalytic performance of Co-Mo-Ce-K/γ-Al 2 O 3 catalyst for the shift reaction of CO in coke oven gas is investigated using X-ray diffraction (XRD) and temperature-programmed reduction (TPR). The results indicate that Ce and K have a synergistic effect on promoting the catalytic activity, and the Co-Mo-Ce-K/γ-Al 2 O 3 catalyst with 3.0 wt-% CeO 2 and 6.0 wt-% K 2 O exhibits the highest activity. CeO 2 favors Co dispersion and mainly produces an electronic effect. TPR characterization results indicate that the addition of CeO 2 -K 2 O in the Co-Mo-Ce-K/γ-Al 2 O 3 catalyst decreases the reduction temperature of active components, and part of octahedrally coordinated Mo 6+ transforms into tetrahedrally coordinated Mo 6+ , which has a close relationship with the catalytic activity.

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Section: Tpr Studiessupporting

confidence: 92%

Catalytic performance of Co-Mo-Ce-K/γ-Al2O3 catalyst for the shift reaction of CO in coke oven gas

Zhao

Zhang

2010

Front. Chem. Eng. China

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“…All the studied catalysts presented similar degrees of reduction, approximately 70%. Kaluža et al (2007) studied the effect of the support in the reduction of Co/Mo catalysts and they found that the 12.4%Co20.6%Mo/MgO catalyst has a degree of reduction close to value found in our experiment, about 75 %.…”

Section: Characterization Of the Catalystssupporting

confidence: 81%

“…All catalysts exhibited three reduction peaks: the first small peak, at 380 °C, may be assigned to the reduction of cobalt particles with weak metalsupport interaction, possibly in the form of Co 3 O 4 . It has been reported that reduction of Co 3 O 4 happens in a stepwise process around 250-380 °C for bulk Co 3 O 4 and around 470-520 °C for Co/MgO (Kaluža et al, 2007). As the hydrogen consumption was very small in the temperature range of typical Co 3 O 4 reduction, Table 1.…”

Section: Characterization Of the Catalystsmentioning

confidence: 89%

Catalyst Preparation Methods to Reduce Contaminants in a High-Yield Purification Process of Multiwalled Carbon Nanotubes

Esteves

Smarzaro

Caytuero

et al. 2019

Braz. J. Chem. Eng.

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CoMo/MgO catalysts with low loading of cobalt and molybdenum were prepared by incipient wetness impregnation and the sol-gel method for high yield production of carbon nanotubes (CNT). A detailed characterization of the catalysts, as-produced CNT and purified CNT, indicated a relationship between carbon nanotube properties, synthesis and purification steps. Excess of molybdenum in the catalyst caused a decrease in carbon yield and produced CNT with a lower degree of graphitization. Catalysts prepared by the sol-gel method and with higher molybdenum loading showed an improved interaction between cobalt and molybdenum, increasing the formation of CoMoO 4 , which was not completely removed during the purification step. The purification removed all MgO and part of the cobalt and molybdenum present in samples without significant damage to the CNT structure. An increase in sample purity could be achieved by increasing reaction time.

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“…The differences observed in yield towards various products over various catalysts studied could indicate that the nature of the active sites present had been modified by the organic additive. Bataille et al [19] suggested that this fact is associated with a more efficient promotion of MoS 2 slabs by Ni in those catalysts; in agreement with these findings, Kaluža et al [20] reported similar results for Mo catalysts promoted by Co.…”

Section: Introductionmentioning

confidence: 58%

Effect of Chitosan on the Performance of NiMoP-Supported Catalysts for the Hydrodesulfurization of Dibenzothiophene

Ríos-Caloch¹,

Santes²,

Escobar

et al. 2016

Journal of Nanomaterials

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Chitosan-added NiMoP catalysts supported on alumina and alumina-titania were studied in the hydrodesulfurization (HDS) of dibenzothiophene (DBT). The preparation of catalysts containing Mo (12 wt%), Ni (3 wt%), P (1.6 wt%), and chitosan/nickel = 2 (mol ratio) was accomplished by sequential pore-filling impregnation varying the order of chitosan integration. Materials were characterized by DRIFTS, TPR, TG-DTA, and XPS techniques. The TG-DTA study showed that the nature of the support influences the degradation of chitosan onto the catalytic materials and also influences the HDS of DBT and the product distribution as well. The series of catalysts supported on alumina presented the most remarkable effect of chitosan, in which the OH and NH groups of the organic molecule interact with acid sites of the support weakening the interaction between alumina and deposited metal phases. In all cases, DBT was converted mainly through direct sulfur removal. The catalysts ChP3/A (alumina support impregnated with chitosan in phosphoric acid solution, prior to NiMoP deposition) and ChP4/AT (alumina-titania support impregnated with NiMoP solution, prior to contacting with a solution comprising chitosan and phosphorus) exhibited the best performance in HDS reactions and also showed the highest selectivity in biphenyl formation. Presence of carbonaceous residua on the catalyst’s surface, as shown by XPS, could enhance the HDS activity over the ChP4/AT sample.

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Effect of support type on the magnitude of synergism and promotion in CoMo sulphide hydrodesulphurisation catalyst

Cited by 69 publications

References 12 publications

Catalytic performance of Co-Mo-Ce-K/γ-Al2O3 catalyst for the shift reaction of CO in coke oven gas

Catalytic performance of Co-Mo-Ce-K/γ-Al2O3 catalyst for the shift reaction of CO in coke oven gas

Catalyst Preparation Methods to Reduce Contaminants in a High-Yield Purification Process of Multiwalled Carbon Nanotubes

Effect of Chitosan on the Performance of NiMoP-Supported Catalysts for the Hydrodesulfurization of Dibenzothiophene

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