Pt/Al-SBA-15 catalysts for hydrocracking of C21–C34 n-paraffin mixture into gasoline and diesel fractions

Seo, Myung Gi; Lee, Dae Won; Lee, Kwan Young; Moon, Dong Ju

doi:10.1016/j.fuel.2014.11.028

Cited by 39 publications

(16 citation statements)

References 30 publications

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“…Various porous sulfided catalysts have been used to produce biofuels from plant oils 3 . NiMo 4 5 6 7 , CoMo 8 9 10 , Pt 11 12 and Pd 13 14 based catalysts with porous SiO 2 -Al 2 O 3 15 16 and zeolites 17 18 support have been used for hydrotreating of plant oils 19 . These catalysts were successfuly used to convert renewable feedstocks into green diesel, stimulating exploration of the potential of other porous materials as catalysts.…”

mentioning

confidence: 99%

NiO-PTA supported on ZIF-8 as a highly effective catalyst for hydrocracking of Jatropha oil

Liu

Wang

et al. 2016

Sci Rep

125

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Nickel oxide (NiO) and phosphotungstic acid (PTA) supported on a ZIF-8 (NiO-PTA/ZIF-8) catalyst was first synthesized and it showed high activity and good selectivity for the hydrocracking of Jatropha oil. The catalyst was characterized by SEM, SEM-EDS, TEM, N2 adsorption, FT-IR, XRD and XPS. Compared with the NiO-PTA/Al2O3 catalyst, the selectivity of C15-C18 hydrocarbon increased over 36%, and catalytic efficiency increased 10 times over the NiO-PTA/ZIF-8 catalyst. The prepared NiO-PTA/ZIF-8 catalyst was stable for a reaction time of 104 h and the kinetic behavior was also analyzed. This catalyst was found to bypass the presulfurization process, showing promise as an alternative to sulfided catalysts for green diesel production.

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mentioning

confidence: 99%

NiO-PTA supported on ZIF-8 as a highly effective catalyst for hydrocracking of Jatropha oil

Liu

Wang

et al. 2016

Sci Rep

125

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“…The relative proportion of the Brønsted and Lewis acid sites ( B/L ratio) was calculated from the intensity of the bands at 1540 cm −1 and 1444 cm −1 to quantify the Brønsted and Lewis acid sites of the mixed Mg−Yb oxides. Assuming that the adsorption sites of pyridine are identical to those of ammonia, the densities of Brønsted and Lewis acid sites were calculated by multiplying the total acid density (measured from NH 3 ‐TPD) by ( B/L )/( B/L +1) and 1/( B/L +1), respectively, as shown in Table …”

Section: Resultsmentioning

confidence: 99%

Catalytic Dehydration of 1,4‐Butanediol over Mg−Yb Binary Oxides and the Mechanism Study

et al. 2020

ChemCatChem

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In this study, MgÀ Yb binary oxides were synthesized using different MgO concentrations and investigated for the catalytic dehydration of 1,4-butanediol (BDO) into 3-buten-1-ol (BTO). The physicochemical properties of the catalysts were characterized by N 2 physisorption, X-ray diffraction, Raman spectroscopy, temperature-programmed techniques, and diffuse reflectance infrared Fourier transform spectroscopy. The MgÀ Yb binary oxides exhibited superior catalytic activity and better BTO selectivity compared with the pristine Yb 2 O 3 or MgO. Structures of MgÀ OÀ Yb were generated in the binary oxides via the interchange of Yb or Mg in the MgO or Yb 2 O 3 crystalline phases. Extra basic and acidic sites were formed over the MgÀ Yb binary oxides because of the formation of surface defects and the presence of MgÀ OÀ Yb structures, respectively. The acidic as well as basic sites were observed to influence the catalytic performance: BDO reactivity was enhanced by the more acidic sites, while BTO selectivity was favored by the basic sites. The highest BTO yield of 71.1 % was achieved over the Mg7Yb3 catalyst with 90.4 % BDO conversion and 78.6 % BTO selectivity at 350°C. The in situ DRIFTS results indicated that BDO was first adsorbed on the catalyst and then reacted with the acidic sites to generate butoxides. The β-H of the surface butoxides was abstracted by the basic oxygen anions to produce aldehyde species, which dissociated to form BTO.[a] R.

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“…To investigate the relative concentrations of Brønsted and Lewis acid sites on the surfaces of the Pt-W[x]/TiO2 catalysts, FT-IR (Fourier transform infrared) analyses were performed by adsorbing pyridine at 200 °C. At Brønsted acid sites, pyridine is adsorbed as a pyridinium ion after accepting a proton, whereas it is adsorbed as covalently bonded pyridine at Lewis acid sites via electron-pair To investigate the relative concentrations of Brønsted and Lewis acid sites on the surfaces of the Pt-W[x]/TiO 2 catalysts, FT-IR (Fourier transform infrared) analyses were performed by adsorbing pyridine at 200 • C. At Brønsted acid sites, pyridine is adsorbed as a pyridinium ion after accepting a proton, whereas it is adsorbed as covalently bonded pyridine at Lewis acid sites via electron-pair sharing [20,21]. Figure 6 shows the FT-IR spectra of the pyridine-adsorbed Pt-W[x]/TiO 2 catalysts.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Nitrogen Monoxide and Soot Oxidation in Diesel Emissions with Platinum–Tungsten/Titanium Dioxide Catalysts: Tungsten Loading Effect

Lee

et al. 2020

Catalysts

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Compared with Pt/TiO2, tungsten-loaded Pt–W/TiO2 catalysts exhibit improved activity for NO and soot oxidation. Using catalysts prepared by an incipient wetness method, the tungsten loading effect was investigated using Brunauer–Emmett–Teller surface areas, X-ray diffraction, transmission electron microscopy (TEM), CO pulse chemisorption, H2 temperature-programmed reduction, NH3 temperature-programmed desorption (NH3-TPD), and pyridine Fourier transform infrared (FT-IR) spectroscopy. Loading tungsten on the Pt/TiO2 catalyst reduced the platinum particle size, as revealed in TEM images. CO pulse chemisorption showed that platinum was covered with tungsten and the dispersion of platinum decreased when 5 wt.% or more of tungsten was loaded. The NH3-TPD and pyridine-FT-IR results demonstrated that the number of strong acid sites and Brønsted acid sites in the catalyst were increased by the presence of tungsten. Therefore, a catalyst containing an appropriate amount of tungsten increased the dispersion of platinum, thereby increasing the number of active sites for NO and soot oxidation, and increased the acidity of the catalyst, thereby increasing the activity of soot oxidation by NO2

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Pt/Al-SBA-15 catalysts for hydrocracking of C21–C34 n-paraffin mixture into gasoline and diesel fractions

Cited by 39 publications

References 30 publications

NiO-PTA supported on ZIF-8 as a highly effective catalyst for hydrocracking of Jatropha oil

NiO-PTA supported on ZIF-8 as a highly effective catalyst for hydrocracking of Jatropha oil

Catalytic Dehydration of 1,4‐Butanediol over Mg−Yb Binary Oxides and the Mechanism Study

Nitrogen Monoxide and Soot Oxidation in Diesel Emissions with Platinum–Tungsten/Titanium Dioxide Catalysts: Tungsten Loading Effect

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