n-Nonane hydroconversion on Ni and Pt containing HMFI, HMOR and HBEA

Kinger, Gerald; Vinek, H.

doi:10.1016/s0926-860x(01)00629-9

Cited by 68 publications

(32 citation statements)

References 30 publications

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“…3), n-octane conversion increased as increasing the platinum content, except for the catalyst 0.75Ni0.25Pt that showed the lowest conversion in all the range of temperature. This behaviour can be explained according to the acid site density of the catalyst (Table 1), which affected to the paraffins conversion [19,20]; specifically, strong acid sites were the responsible of the isomerization reaction [21]. As above mentioned, the acidity values decreased as the nickel content was increased.…”

Section: Catalysts Characterizationmentioning

confidence: 84%

Influence of the Addition of a Second Metal on the Catalytic Performance of Pt-Beta Agglomerated Catalyst in the Hydroisomerization of n-Octane

et al. 2008

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Section: Catalysts Characterizationmentioning

confidence: 84%

Influence of the Addition of a Second Metal on the Catalytic Performance of Pt-Beta Agglomerated Catalyst in the Hydroisomerization of n-Octane

et al. 2008

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“…Meanwhile, the decrease of conversion is most related to the decrease of the amount of acid sites, especially the strong acid sites, due to those treatments (Fig. 8) [46][47]. Compared to Pt/ (BM), Pt/BM (40) had much higher selectivity to isomerization coupled with a considerable conversion.…”

Section: Nh 3 -Tpdmentioning

confidence: 98%

Effect of SiO₂/Al₂O₃Ratio on Micro-Mesopore Formation for Pt/Beta-MCM-41 via NaOH Treatment and the Catalytic Performance in N-heptane Hydro isomerization

Gao

Shi²,

Liu

et al. 2018

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. Micro-mesoporous composite material Beta-MCM-41(BM) were hydrothermally synthesized by treating parent beta with molar SiO 2 /Al 2 O 3 ratios of 12.5, 20 and 30 as precursors. The influence of SiO 2 /Al 2 O 3 ratio of zeolite beta on effective micro-mesoporous composite formation was studied by investigating the crystallinity, morphology, chemical composition, acidity and textural property of Beta-MCM-41 through XRD, nitrogen adsorption, SEM, TEM, NH 3 -TPD, FTIR and Pyridine-FTIR. The catalytic performance was evaluated in terms of n-heptane hydro isomerization. The results demonstrated that Beta-MCM-41 supported Pt catalysts showed higher selectivity to isoheptanes than Pt/Beta. It was attributed to the superiorities of the pore structure and mesoporous accelerated the diffusion of larger molecules of isoheptanes.

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“…This Dn OH shift of 88 cm -1 was found for all BEA zeolites independently from their framework boron contents. Since Dn OH reflects the deprotonation energy of the OH group [16], it can be concluded that in BEA zeolites bridged hydroxyls associated with Al(OSi) 4 units are, independently of co-existing framework boron, of the same intrinsic acid strength. The intrinsic acid strength was also not affected by incorporation of sodium cations by ion exchange up to exchange levels of 50-60 % (spectra are not shown).…”

Section: Acidity Of Parent Bea Zeolitesmentioning

confidence: 99%

“…[6,7]. In contrast, only a few studies [14][15][16][17], deal with the catalytic behavior of Ni/H-BEA. The isomerization/crack selectivity of these catalysts is known to depend crucially on the acid site density, the acid strength of the sites and the metal/acid ratio.…”

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-Nonane hydroconversion on Ni and Pt containing HMFI, HMOR and HBEA

Cited by 68 publications

References 30 publications

Influence of the Addition of a Second Metal on the Catalytic Performance of Pt-Beta Agglomerated Catalyst in the Hydroisomerization of n-Octane

Influence of the Addition of a Second Metal on the Catalytic Performance of Pt-Beta Agglomerated Catalyst in the Hydroisomerization of n-Octane

Effect of SiO₂/Al₂O₃Ratio on Micro-Mesopore Formation for Pt/Beta-MCM-41 via NaOH Treatment and the Catalytic Performance in N-heptane Hydro isomerization

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

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n-Nonane hydroconversion on Ni and Pt containing HMFI, HMOR and HBEA

Cited by 68 publications

References 30 publications

Influence of the Addition of a Second Metal on the Catalytic Performance of Pt-Beta Agglomerated Catalyst in the Hydroisomerization of n-Octane

Influence of the Addition of a Second Metal on the Catalytic Performance of Pt-Beta Agglomerated Catalyst in the Hydroisomerization of n-Octane

Effect of SiO2/Al2O3Ratio on Micro-Mesopore Formation for Pt/Beta-MCM-41 via NaOH Treatment and the Catalytic Performance in N-heptane Hydro isomerization

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

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Effect of SiO₂/Al₂O₃Ratio on Micro-Mesopore Formation for Pt/Beta-MCM-41 via NaOH Treatment and the Catalytic Performance in N-heptane Hydro isomerization