The effect of Si/Al ratio of zeolite Y in NiW catalyst for second stage hydrocracking

Golubev, I.S.; Дик, П. П.; Казаков, М. О.; Pereyma, V. Yu.; Климов, О. В.; Smirnova, M. Yu.; Prosvirin, Igor P.; Кондрашев, Д. О.; Golovachev, V. A.; Ведерников, О. С.; Kleimenov, A. V.; Носков, А. С.

doi:10.1016/j.cattod.2021.01.014

Cited by 23 publications

(7 citation statements)

References 44 publications

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“…There was also a moderately negative significant correlation ( R = −0.37, p < 0.01) between the micropore volume and the Si/Al ratio. This phenomenon has been reported in other studies and was attributed to reduced crystallinity and reduction of unit cell size due to delamination processes. , Statistically significant correlations were also observed between the Si/Al ratio and other structural framework variables, i.e., surface area, pore size, and mesoporous volume. This may be attributed to the phenomenon of reduced crystallinity described earlier.…”

Section: Resultssupporting

confidence: 85%

Insight into Adsorptive Desulfurization by Zeolites: A Machine Learning Exploration

et al. 2022

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Adsorptive desulfurization (ADS) of hydrocarbon fuels using zeolite-based adsorbents holds great promise due to the mild conditions required to remove sulfur, thus addressing the energy and environmental concerns. However, screening of the ever-increasing number of potential ADS zeolites for adsorptive capacity is increasingly intractable. Furthermore, there is no consensus on the parameters with a dominating influence; hence, adsorbent synthesis design has remained an art. Machine learning (ML) has gained popularity as a powerful tool for understanding the catalytic mechanism and providing insights into catalytic design. In this study, we used multiple linear regression (MLR) and random forest (RF) regression to explore the process of ADS by zeolites using data from the literature. We found better predictive performance under the RF model (R 2 = 0.93) than the MLR model (R 2 = 0.88), which violated the assumption of linearity. The initial adsorbate concentration showed the highest relative importance of the variables, followed by zeolite properties (metal ion, mesoporous volume, pore size, Si/Al ratio, and surface area) for ADS activity. Our RF prediction model may be used in place of experimental ADS zeolite screening, cutting down on time and resource requirements. This work demonstrates the utility of ML and literature survey data as an inexpensive alternative to experimentation when doing research to obtain mechanistic insight into the complex process of ADS.

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Section: Resultssupporting

confidence: 85%

Insight into Adsorptive Desulfurization by Zeolites: A Machine Learning Exploration

et al. 2022

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“…Furthermore, the Si/Al ratios of HY, 5CaCO3/HY, 10CaCO3/HY, and 20CaCO3/HY catalysts are 26. 08, 29.76, 20.04, and 24.78, respectively. The increased Si/Al ratio changes the acidic zeolite characteristics, resulting in a reduction in the concentration of Brønsted acid sites (Golubev et al, 2021). However, Doyle et al (2016) stated that the increase in the Si/Al ratio of zeolite over 2.5-10.0 increased the strength of Brønsted acid, the hydrophobicity of the catalyst, and the number of acid sites.…”

Section: Morphology Analysis Of Catalysts Using Sem-edxmentioning

confidence: 99%

Bifunctional CaCO3/HY Catalyst in the Simultaneous Cracking-Deoxygenation of Palm Oil to Diesel-Range Hydrocarbons

Febriansyar

Riyanto

Istadi

et al. 2022

Indonesian J. Sci. Technol

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Palm oil is a promising raw material for biofuel production using the simultaneous catalytic mechanism of the bifunctional cracking-deoxygenation reactions. Through the cracking-deoxygenation process, the chains of palmitic acid and oleic acid in the palm oil were converted to diesel-range hydrocarbons. The combination effects of CaCO3 and HY zeolite enhanced the bifunctional catalytic cracking-deoxygenation of palm oil into biofuel, because of the increasing acid and basic sites in the catalysts due to the synergistic roles of CaCO3 and HY. The introduction of CaCO3 on HY zeolite generated both a strong acid and strong basic sites simultaneously on the designed catalyst, which supports the bifunctional mechanisms of hybrid cracking-deoxygenation, respectively. The CaCO3 impregnated on the HY catalyst has a synergistic and bifunctional effect on the catalyst supporting cracking-deoxygenation reaction mechanisms as mentioned previously. The deoxygenation reaction required the bifunctional strong acid and strong basic sites on the CaCO3/HY catalyst through decarboxylation, decarbonylation, and hydrodeoxygenation reaction mechanisms. Meanwhile, the cracking reaction pathway was supported by the strong acid sites generated on the CaCO3/HY catalyst. In other words, the high acidity strength promotes diesel selectivity, whereas the high strength of basicity leads to the deoxygenation reaction.

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“…NiMoS or NiWS supported zeolites have reported as catalysts with high tolerance to hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) reactions occurred through the HC process 20 . Furthermore, with utilizing the zeolite support properties such as Al/Si ratio, 21 acidity, pores, and crystallite size, 22 the necessary balance between activity and selectivity can be achieved.…”

Section: Introductionmentioning

confidence: 99%

Bio‐fuels production through waste tires pyrolytic oil upgrading over Ni‐W/zeolite composites derived from blast furnace slag

El‐Deeb

Ahmed

Dhmees

et al. 2022

Intl J of Energy Research

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Waste tires is one of the solid residuals that can have serious impacts environmentally. Therefore, controlling this waste through conversion into valueadded products such as bio-fuels is highly recommended. Consequently, this work reports catalytic-hydrocracking of waste tire pyrolytic oil (WTPO) to fuels over Ni-W supported on zeolite X and A. The zeolites were hydrothermally synthesized from another type of waste, namely blast furnace slag (BFS). The prepared samples were characterized by X-ray diffraction (XRD) analysis. The successive synthesis of zeolites A and X could be detected through observing cubic and octahedral particles via scanning electron microscopy (SEM). The two prepared catalysts presented mesoporous natures with reasonable specific surface area, as acquired from nitrogen adsorption-desorption analysis. The catalysts activity toward upgrading of WTPO was investigated under different operating conditions. Particularly, both catalysts have exhibited high activity through producing reasonable yields of gasoline (35% and 40%) and high yields of diesel (45% and 30%) by Ni-W loaded zeolite A and X, respectively. Additionally, zeolite X supported catalyst showed a higher selectivity toward catalytic HDS of WTPO than the zeolite A. The former optimum findings were collected at the following operating conditions: 80 bar, 450 C and LHSV of 1.2 h À1 .

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The effect of Si/Al ratio of zeolite Y in NiW catalyst for second stage hydrocracking

Cited by 23 publications

References 44 publications

Insight into Adsorptive Desulfurization by Zeolites: A Machine Learning Exploration

Insight into Adsorptive Desulfurization by Zeolites: A Machine Learning Exploration

Bifunctional CaCO3/HY Catalyst in the Simultaneous Cracking-Deoxygenation of Palm Oil to Diesel-Range Hydrocarbons

Bio‐fuels production through waste tires pyrolytic oil upgrading over Ni‐W/zeolite composites derived from blast furnace slag

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