Effect of silicon precursor on silicon incorporation in SAPO-11 and their catalytic performance for hydroisomerization of n -octane on Pt-based catalysts

Yang, Zhichao; Li, Jilong; Liu, Yunqi; Liu, Chenguang

doi:10.1016/j.jechem.2017.02.002

Cited by 45 publications

(18 citation statements)

References 35 publications

(56 reference statements)

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“…The low magnification SEM image ( Figure 2 c) shows that the SAPO-11 molecular sieve exhibited a spherical structure, with a relatively smooth surface ( Figure 2 d), which is typical of materials obtained from colloidal silica stabilized in aqueous media [ 42 , 43 ]. Figure 2 e, with low magnification, confirms the XRD patterns, showing the morphology of the 24/SH sample, the presence of the AEL structure, and small spherical particles characteristic of SAPO-11, and Figure 2 f shows stick or plate-shaped particles with agglomerated crystals that usually are associated with some contamination, probably from AFI structure, as previously reported [ 34 , 43 , 44 ].…”

Section: Resultssupporting

confidence: 86%

Hydrothermal Synthesis of Silicoaluminophosphate with AEL Structure Using a Residue of Fluorescent Lamps as Starting Material

et al. 2021

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Silicoaluminophosphate molecular sieves of SAPO-11 type (AEL structure) were synthesized by the hydrothermal method, from the residue of a fluorescent lamp as a source or Si, Al, and P in the presence of water and di-propyamine (DPA) as an organic template. To adjust the P2O5/SiO2 and Si/Al and ratios, specific amounts of silica, alumina, or alumina hydroxide and orthophosphoric acid were added to obtain a gel with molar chemical composition 1.0 Al2O3:1.0 P2O5:1.2 DPA:0.3 SiO2:120 H2O. The syntheses were carried out at a temperature of 473 K at crystallization times of 24, 48, and 72 h. The fluorescent lamp residue and the obtained samples were characterized by X-ray fluorescence, X-ray diffraction, scanning electron microscopy, and BET surface area analysis using nitrogen adsorption isotherms. The presence of fluorapatite was detected as the main crystalline phase in the residue, jointly with considered amounts of silica, alumina, and phosphorus in oxide forms. The SAPO-11 prepared using aluminum hydroxide as Al source, P2O5/SiO2 molar ratio of 3.6 and Si/Al ratio of 0.14, at crystallization time of 72 h, achieves a yield of 75% with a surface area of 113 m2/g, showing that the residue from a fluorescent lamp is an alternative source for development of new materials based on Si, Al, and P.

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Section: Resultssupporting

confidence: 86%

Hydrothermal Synthesis of Silicoaluminophosphate with AEL Structure Using a Residue of Fluorescent Lamps as Starting Material

et al. 2021

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“…180 °C and the second peak at ca. 290 °C were assigned to desorption of NH 3 adsorbed on the weak and medium strong acid sites, respectively [9,28] . When the metal component impregnated or precipitated on SAPO-11, the first peak tended to low temperature and the intensity of the second peak decreased, indicating that a part of acid sites were covered by the metal components [18,29] .…”

Section: Characterizations Of the Catalystsmentioning

confidence: 99%

Effect of preparation method on the bimetallic NiCu/SAPO-11 catalysts for the hydroisomerization of n-octane

Yang

Liu

et al. 2019

Journal of Energy Chemistry

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“…Therefore, increasing the medium and strong Brønsted (B) acid content of SAPO-11 is bound to improve the catalytic performance of SAPO-11. At present, noble metals (Pt, Pd) are the most widely used metal components of bifunctional catalysts for the isomerization of alkane, which are highly sensitive to the sulfur-containing compounds in raw materials during the catalytic reaction, and can easily lead to poisoning and deactivation of catalysts ( Yang et al, 2017 ; Lyu et al, 2019 ; Lyu et al, 2020 ). Meanwhile, the high cost of noble metals also increases the cost of preparation of these catalysts, which limits their industrial applications ( Xiao et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Nickel In Situ Modified SAPO-11 Molecular Sieves and Hydroisomerization Performance of Their NiWS Supported Catalysts

et al. 2021

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SAPO-11 molecular sieves were modified with different Ni contents by the in situ modification method. The Ni-modified SAPO-11 molecular sieves were used as the supports to prepare the corresponding NiW-supported catalysts for the hydroisomerization of n-hexadecane. The Ni-modified SAPO-11 and the corresponding NiW-supported catalysts were characterized by X-ray diffraction, scanning electron microscopy, N2 adsorption–desorption, NH3-temperature-programmed desorption, pyridine adsorbed infrared, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. The results showed that Ni in situ modification preserved the crystal structure of SAPO-11; increased the BET specific surface area, mesopore volume, and medium and strong Brønsted acid amount of SAPO-11; and increased the stacking number of the active phase of the catalysts. 3Ni-SAPO-11 possessed the largest BET specific surface area, mesopore volume, and medium and strong Brønsted acid amount. NiW/3Ni-SAPO-11 possessed the highest dispersion of the active phase and the highest sulfidation degree of the active metals. The results of the hydroisomerization of n-hexadecane showed that Ni in situ modification improved the catalytic activity and selectivity of the catalysts for the hydroisomerization of n-hexadecane to varying degrees. Especially, NiW/3Ni-SAPO-11 had the highest catalytic activity and isomer selectivity, and the maximum yield of isomeric hexadecane could reach 71.18%.

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Effect of silicon precursor on silicon incorporation in SAPO-11 and their catalytic performance for hydroisomerization of n -octane on Pt-based catalysts

Cited by 45 publications

References 35 publications

Hydrothermal Synthesis of Silicoaluminophosphate with AEL Structure Using a Residue of Fluorescent Lamps as Starting Material

Hydrothermal Synthesis of Silicoaluminophosphate with AEL Structure Using a Residue of Fluorescent Lamps as Starting Material

Effect of preparation method on the bimetallic NiCu/SAPO-11 catalysts for the hydroisomerization of n-octane

Synthesis of Nickel In Situ Modified SAPO-11 Molecular Sieves and Hydroisomerization Performance of Their NiWS Supported Catalysts

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