Hydroisomerization of N-decane in the presence of sulfur and nitrogen compounds

Galperin, L.B.

doi:10.1016/s0926-860x(00)00759-6

Cited by 40 publications

(27 citation statements)

References 22 publications

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“…Recent experimental studies corroborate molecular simulations indicating that CHA-type molecular sieves also contain too many of these narrow apertures per n-alkane to afford the complete adsorption of n-octane or n-decane [16,17,53,87], so that the conversion of n-octane and n-decane is indeed likely to be limited to the exterior surface and should afford an example of pore mouth and key-lock catalysis. In agreement with catalysis occurring exclusively at the small exterior surface of CHA-type molecular sieves, CHA-type sieves exhibit a dramatically lower n-octane and n-decane conversion activity than sieves with apertures large enough to accommodate reactants and products fully at their large interior surface [88][89][90]. From what little data are available on pore mouth and key-lock catalysis with CHA-type silicoaluminophosphates, it appears that these sieves favor hydrocracking more than hydroisomerization [89,90].…”

Section: Catalysis On Ton-and Mtt-type Zeolites With Inactivated Extementioning

confidence: 60%

“…In agreement with catalysis occurring exclusively at the small exterior surface of CHA-type molecular sieves, CHA-type sieves exhibit a dramatically lower n-octane and n-decane conversion activity than sieves with apertures large enough to accommodate reactants and products fully at their large interior surface [88][89][90]. From what little data are available on pore mouth and key-lock catalysis with CHA-type silicoaluminophosphates, it appears that these sieves favor hydrocracking more than hydroisomerization [89,90]. Pore mouth and key-lock catalysis would predict that the selectivity should shift toward hydroisomerization when a sieve is used in which CHA-sized apertures are more widely dispersed across the exterior crystal surface.…”

Section: Catalysis On Ton-and Mtt-type Zeolites With Inactivated Extementioning

confidence: 60%

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Shape-selective n-alkane hydroconversion at exterior zeolite surfaces

Maesen

Krishna²,

Baten³

et al. 2008

Journal of Catalysis

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A critical review of the adsorption and catalysis of n-and methylalkanes demonstrates that the interior surface of TON-and MTT-type zeolites dominates both adsorption and catalysis, and that the contribution from the exterior surface is negligible. For both n-and methylalkane isomers, the experimental Henry constants at the interior TON-type zeolite surface are more than an order of magnitude greater than those at the exterior surface. Molecular simulations on exclusively interior TON-type silica surface reproduce the adsorption isotherms of n-and methylalkane isomers remarkably well and suggest that even an isomer as bulky as 2,3-dimethylpentane could have access to the interior TON-type zeolite surface. Only the reference state used in solution thermodynamics affords an equitable comparison between internal and external surface thermodynamics. It indicates that methylalkanes adsorb in a structured fashion at the exterior TON-type zeolite surface when the interior surface is inaccessible. But the entropic penalty for this organized exterior surface "pore mouth" or "key-lock" adsorption is high, so that methylalkanes prefer adsorption at the interior surface when it is accessible. We speculate that CHA-and ERI-type sieves exhibit exterior surface catalysis in long n-alkane conversion, but the database remains too small to allow investigation of the full potential of shape selectivity in exterior zeolite surface catalysis.

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Section: Catalysis On Ton-and Mtt-type Zeolites With Inactivated Extementioning

confidence: 60%

Section: Catalysis On Ton-and Mtt-type Zeolites With Inactivated Extementioning

confidence: 60%

Shape-selective n-alkane hydroconversion at exterior zeolite surfaces

Maesen

Krishna²,

Baten³

et al. 2008

Journal of Catalysis

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“…Hydroisomerization reactions are usually carried out over bi-functional catalysts having metal sites for the hydrogenation-dehydrogenation and acidic sites for C-C skeleton rearrangements. If the hydrogenation ability is high enough, then the hydroisomerization selectivity of the bi-functional catalysts is mainly dependent on the pore structure [3][4][5] and the acidity [6][7][8]. Some research works [7,8] have revealed that decreasing of the catalyst acidity is beneficial for reducing the cracking activity.…”

Section: Introductionmentioning

confidence: 99%

“…If the hydrogenation ability is high enough, then the hydroisomerization selectivity of the bi-functional catalysts is mainly dependent on the pore structure [3][4][5] and the acidity [6][7][8]. Some research works [7,8] have revealed that decreasing of the catalyst acidity is beneficial for reducing the cracking activity. It was showed that medium-pored ZSM-22 [5,9], ZSM-23 [10] and SAPO-11 [2][3][4][11][12][13]] molecular sieves loaded with Pt or Pd exhibited high hydroisomerization selectivities.…”

Section: Introductionmentioning

confidence: 99%

Hydroisomerization of Long-Chain Alkane Over Pt/SAPO-11 Catalysts Synthesized from Nonaqueous Media

et al. 2005

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SAPO-11 molecular sieves were synthesized from nonaqueous media. The effects of Si and Al sources as well as solvents on the catalytic performance of SAPO-11 were investigated by the hydroisomerization reaction of n-dodecane. The samples were characterized by XRD, XRF, N 2 -adsorption, SEM, NH 3 -TPD, IR-NH 3 and 29 Si CP MAS NMR. The SAPO-11 samples synthesized with tetraethoxysilane as the Si source showed higher Si incorporation contents than the SAPO molecular sieves prepared with polymeric Si sources (fumed silica and Si colloidal gel). The reaction results showed that Pt/SAPO-11 catalysts synthesized from ethylene glycol and glycerol media with the monomeric Si and Al sources (tetraethoxysilane, aluminum isopropoxide) exhibited higher catalytic activities than those catalysts with the polymeric Si or Al (pseudo-boehmite) sources, due to the larger external surface area and higher acidity of the former ones. Especially, the catalyst synthesized in an ethylene glycol medium possessed the highest catalytic activity. Over this catalyst, 88% conversion of n-dodecane was achieved at a low temperature of 250°C.

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“…The major parameters influencing the reaction selectivity are the pore structure [7][8][9] and the acidity. [10][11][12] The key to the successful preparation of active and selective catAbstract: Platinum nanoparticles supported on Al-MCM-48 materials have been prepared. The resultant catalysts have been characterized by means of XRD, N 2 physisorption experiments, scanning electron microscopy (SEM), transmission electron microscopy (TEM), temperature-programmed reduction (TPR), and diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS).…”

Section: Introductionmentioning

confidence: 99%

Preparation of Highly Active and Dispersed Platinum Nanoparticles on Mesoporous Al‐MCM‐48 and Their Activity in the Hydroisomerisation of n‐Octane

Campelo

Lee

Luque

et al. 2008

Chemistry A European J

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Platinum nanoparticles supported on Al-MCM-48 materials have been prepared. The resultant catalysts have been characterized by means of XRD, N2 physisorption experiments, scanning electron microscopy (SEM), transmission electron microscopy (TEM), temperature-programmed reduction (TPR), and diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS). The activity of these nanoparticles has been tested in relation to the hydroisomerisation of n-octane. The catalytic activities were typically 50 %, with selectivities in the isomerisation process in excess of 70 %, favouring the formation of the 3-methylheptane isomer with respect to the 2- and 4-methylheptanes.

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Hydroisomerization of N-decane in the presence of sulfur and nitrogen compounds

Cited by 40 publications

References 22 publications

Shape-selective n-alkane hydroconversion at exterior zeolite surfaces

Shape-selective n-alkane hydroconversion at exterior zeolite surfaces

Hydroisomerization of Long-Chain Alkane Over Pt/SAPO-11 Catalysts Synthesized from Nonaqueous Media

Preparation of Highly Active and Dispersed Platinum Nanoparticles on Mesoporous Al‐MCM‐48 and Their Activity in the Hydroisomerisation of n‐Octane

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