n-Heptane hydroisomerization over Pt-containing mixtures of zeolites with inert materials

Kinger, Gerald; Majda, Dorota; Vinek, H.

doi:10.1016/s0926-860x(01)00876-6

Cited by 61 publications

(29 citation statements)

References 29 publications

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“…The isomerization reaction rate and the product distribution are greatly influenced by the diffusion performance [24]. As Höchtl et al [25] reported that bifunctional catalyst with 0.5 wt% Pt loaded with the impregnation method could provide sufficient metal sites for matching with the acid sites of the catalyst supports.…”

Section: Hydroisomerization Of Hexadecanementioning

confidence: 99%

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Synthesis, Characterization and Hydroisomerization Performance of SAPO-11 Molecular Sieves with Caverns by Polymer Spheres

2009

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Silicoaluminophosphates SAPO-11 molecular sieves with caverns were synthesized using polystyrene (PS) micro-spheres as template. The morphologies of the cavitary SAPO-11 molecular sieves exhibit spherical particles ranging 7-10 lm aggregated from cubic plate microcrystallites which just like the SAPO-11 molecular sieves synthesized with the conventional method, but some caverns of 500-1,200 nm pore size in diameter can be observed on the former material. The strength and distribution of the acid sites of the cavitary SAPO-11 are similar to that of the conventional SAPO-11, but the acid density is slightly low owing to the decreased crystallinity of the cavitary SAPO-11. The micropores size and mesopores size of the conventional SAPO-11 are centered at about 0.45 and 3.8 nm, respectively, while the cavitary SAPO-11 has, in addition to the micropores and mesopores, large mesopores ranging 5-30 nm and macropores ranging from about 100 to 1,200 nm, which were derived from the PS sphere template. Hydroisomerization of n-hexadecane was performed to investigate the catalytic performance of the cavitary SAPO-11. The result showed that, in comparison with the conventional SAPO-11, the cavitary SAPO-11 has high activity based on per active site and high selectivity, owing to the fast diffusion of the reactant and isomer products inside the catalyst.

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Section: Hydroisomerization Of Hexadecanementioning

confidence: 99%

“…In general, besides the conversion of reactant, the activity of catalyst can also be expressed by the apparent reaction rate or by the turnover frequency (TOF) on each active site [24,26]. The apparent reaction rate is defined as the molar number of reacted reactant per time on per weight of catalyst.…”

Section: Hydroisomerization Of Hexadecanementioning

confidence: 99%

Synthesis, Characterization and Hydroisomerization Performance of SAPO-11 Molecular Sieves with Caverns by Polymer Spheres

2009

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“…According to this author the beneficial effect of the hybrid system, when compared with ZSM-5 zeolite alone, is attributed to the formation of a micropore-mesopore continuum within the hybrid catalysts system which decreases the resistance to the outward diffusion of products, mainly for bulkier product molecules. Kinger et al [8] also found higher activity and selectivity for composite catalysts made of HMCM-22 or BEA with MCM-41 or SiO 2 in n-heptane hydroisomerization. The results were explained by the faster adsorption and desorption rates of reactive molecules in the composite.…”

Section: Introductionmentioning

confidence: 94%

n-Hexane Hydroisomerization Over Composite Catalysts Based on BEA Zeolite and Mesoporous Materials

et al. 2009

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“…The path and mechanism of the involved reactions, the nature and mode of action of the diverse catalytically active sites in the individual catalyst components, the role of the chain length of the paraffinic reactants and reaction conditions, and the significance of the crystal structure of the zeolite applied as acidic component of the catalyst have been studied in detail. In the last decade, however, mesoporous molecular sieves, such as MCM-41 [8][9][10] were also investigated in the hydroconversion of n-paraffins. Several processes using bifunctional zeolite catalysts were upgraded to the industrial scale for, e.g., improvement of the octane number of gasoline fractions by hydroisomerization or dewaxing of gas oils by concerted hydrocracking and hydroisomerization.…”

Section: Introductionmentioning

confidence: 99%

n-Heptane hydroconversion over nickel-loaded aluminum- and/or boron-containing BEA zeolites prepared by recrystallization of magadiite varieties

Mihályi

Lónyi

Beyer

et al. 2013

Journal of Molecular Catalysis A: Chemical

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Phase-pure [Al]BEA and [Al,B]BEA zeolites, prepared by solid-state recrystallization of synthetic aluminum-containing magadiites and conventionally synthesized [B]BEA, were tested, after ion exchange with nickel, as bifunctional catalysts for hydroconversion of n-heptane. The reducibility of nickel ions incorporated into BEA zeolites by ion exchange was investigated by temperature-programmed reduction (TPR). The acidity of the samples was characterized with strong (pyridine (Py), ammonia (NH 3 )) and weak (nitrogen) bases. The adsorbed bases were studied by transmission FT-IR (Py), diffuse reflectance infrared Fourier-transform (DRIFT) spectroscopy (N 2 ), and temperatureprogrammed ammonia evolution (TPAE, NH 3 ). Over Ni/H-[B]BEA the reactants were completely converted via fast hydrogenolysis, whereas this reaction pathway plays only a negligible role in the hydroconversion over Ni/H-[Al]BEA and Ni/H-[Al,B]BEA zeolites. Boron-containing BEA zeolites were less active catalysts than the boron-free catalyst in the principal unimolecular hydroconversion reactions. However, incorporation of boron into the framework of BEA zeolite results in a considerable selectivity shift towards isomerization. Results suggest that the acid strength of bridged hydroxyls, probed with weak (N 2 ) and strong basis (pyridine), was found to be similar in the boron-free and boroncontaining BEA samples. The decrease in the isomerization rate and the increase of the apparent activation energy upon incorporation of boron may be attributed to the decrease in the heat of n-heptane adsorption.

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n-Heptane hydroisomerization over Pt-containing mixtures of zeolites with inert materials

Cited by 61 publications

References 29 publications

Synthesis, Characterization and Hydroisomerization Performance of SAPO-11 Molecular Sieves with Caverns by Polymer Spheres

Synthesis, Characterization and Hydroisomerization Performance of SAPO-11 Molecular Sieves with Caverns by Polymer Spheres

n-Hexane Hydroisomerization Over Composite Catalysts Based on BEA Zeolite and Mesoporous Materials

n-Heptane hydroconversion over nickel-loaded aluminum- and/or boron-containing BEA zeolites prepared by recrystallization of magadiite varieties

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