Support effect on the formation of catalytic site precursors in the thiophene hydrodesulfurization

Kraleva, Elka; Spojakina, A.; Jirátová, Květa; Petrov, L.

doi:10.1007/s10562-006-0110-2

Cited by 5 publications

(4 citation statements)

References 28 publications

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“…The subsequent results are shown in Figure for the Mo 3d 5/2 XPS spectra. In the latter plot, the Mo 6+ with binding energy ( E ) of 232.5 eV is related to oxide polymolybdate phases . Other results also show that the sulfide phase is not stable at this stage and the sample oxidizes quickly due to contact with air, which is why the Mo 4+ peak related to MoS 2 , is not observed in the plot.…”

Section: Resultsmentioning

confidence: 93%

“…When the metal particles spread more evenly, it is expected that agglomeration of the particles reduces leading to smaller particle sizes. Reduced particle sizes and higher dispersion suggest more pronounced catalytic activity. , Higher dispersion can also be due to the mesoporous structure of the activated carbon samples as well as acidic surface agents …”

Section: Resultsmentioning

confidence: 99%

“…In the latter plot, the Mo 6+ with binding energy (E) of 232.5 eV is related to oxide polymolybdate phases. 41 Other results also show that the sulfide phase is not stable at this stage and the sample oxidizes quickly due to contact with air, which is why the Mo 4+ peak related to MoS 2 , is not observed in the plot. Regarding the Fe 2 P diagram in Figure 9, the peaks represent Fe 3+ and three different combinations of Fe.…”

Section: Tpr Testmentioning

confidence: 93%

“…Reduced particle sizes and higher dispersion suggest more pronounced catalytic activity. 1,41 Higher dispersion can also be due to the mesoporous structure of the activated carbon samples as well as acidic surface agents. 42 3.3.2.…”

Section: Catalyst Characterizations 331 Xrd Analysismentioning

confidence: 99%

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Effectiveness Study of Mesoporous Size, Acidity, and Precursor Type on Characterization of Activated Carbon as an Fe–Mo Catalyst Support for Hydrodesulfurization of Heavy Naphtha

Soleymani

Karimzadeh

Rashidi³

et al. 2023

Ind. Eng. Chem. Res.

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The main goal of this research is to evaluate the effects of various parameters on the synthesis of a Fe−Mo catalyst supported on an in-house developed mesoporous activated carbon. For this purpose, mesoporous carbon has been prepared from grape branches and oil palm trunks under various activation times and drying periods. Consequently, optimum values of the aforementioned parameters have been obtained in order to synthesize an efficient support for developing a heavy naphtha hydrodesulfurization (HDS) catalyst. Subsequently, a mixture of Fe−Mo with a weight ratio of 1:3 has been loaded on the developed supports through a wet impregnation method. Various experimental analyses including X-ray diffraction (XRD), Fourier transform infrared (FTIR), Brunauer−Emmett−Teller (BET), temperature programmed desorption (TPD), temperature programmed reduction (TPR), field-emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), X-ray fluorescence (XRF), thermogravimetric analysis (TGA), and energy dispersive X-ray (EDX) have been undertaken to determine the characteristics of synthetic catalysts and activated carbons. Once an appropriate catalyst has been synthesized on the basis of the experimental analyses, its performance for hydrodesulfurization of heavy naphtha has been investigated and has been compared to the efficiency of a catalyst with a commercial activated carbon support. The obtained results reveal that the sulfur conversions of heavy naphtha containing 900 ppm sulfur compounds at atmospheric pressure and at 340 °C are around 78 and 55% for the desulfurization process using the synthesized catalyst in the present work and the used commercial catalyst, respectively. It has also been found that a combination of grape branches and oil palm trunks contributes to an efficient mesoporous carbon structure, an acceptable thermal stability, and the development of a cost-effective support for the synthesis of an industrially viable HDS catalyst.

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Section: Resultsmentioning

confidence: 93%