Hydrocracking and Diffusion of Pure Compounds on Mordenite Catalysts

Beecher, Richard; Voorhies, Alexis; Eberly, P. E.

doi:10.1021/i360027a010

Cited by 34 publications

(28 citation statements)

References 4 publications

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“…The studies here help to explain some selectivity phenomena reported on molecular sieve catalysts. Beecher et al (1968) studied the hydrocracking of pure n-decane, decalin, and a 46/54 mole % mixture over Pd-H-mordenite. They found that with the 46/54 mixture of n-decane and decalin, relatively little n-decane was converted, although n-decane alone was more readily hydrocracked than decalin.…”

Section: Selective Adsorption and Reaction Selectivitymentioning

confidence: 99%

Liquid sorption equilibria of selected binary hydrocarbon systems in type Y zeolites

Satterfield

Cheng

1972

AIChE Journal

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On NaY and HY, aromatic compounds are selectively adsorbed in preference to paraffins and naphthenes. Smaller aromatic compounds are adsorbed in preference to larger aromatic compounds. All the compounds studied can be sorbed into the pore structure of the zeolites and the selectivities are primarily a reflection of relative affinity for the zeolite and steric effects rather than a sieving effect.

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Section: Selective Adsorption and Reaction Selectivitymentioning

confidence: 99%

Liquid sorption equilibria of selected binary hydrocarbon systems in type Y zeolites

Satterfield

Cheng

1972

AIChE Journal

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“…The rate of reaction of the reactant is the key approximation to take into account, as reported previously. [32] In an ideal bifunctional catalyst, the metal phase only (de)hydrogenates, while the rate-determining step is the rearrangement and/or scission of the intermediates at the acidic sites.…”

Section: Resultsmentioning

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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“…Recent papers on H-mordenite-catalyzed reactions, which also give guidance to earlier literature, include studies of hydrocracking of n-hexane and cyclohexane (Voorhies and Hatcher, 1969), of hexane isomerization (Beecher and Voorhies, 1969), and of methanol dehydration (Swabb and Gates, 1972). Acid-leached mordenites of various silica-alumina ratios were studied by Eberly and Kimberlin (1970) far cracking of cumene, by Beecher et al (1968) for hydrocracking of n-decane and Decalin, by Hopper and Voorhies (1972) for hydroisomerization of cyclohexane and n-pentane, and by Thakur and Weller (1973) for cracking of hexane.…”

Section: Conclusion and Significancementioning

confidence: 99%

Sorption and diffusivity characteristics of acid‐leached mordenites

Satterfield

Chiu

1974

AIChE Journal

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The apparent diffusivity for the binary liquid systems benzene-cumene and cyclohexane-cumene in H-mordenite crystals at 25OC to 44OC was increased by an order of magnitude or more after the zeolite was acid-leached to increase the silica-alumina mole ratio from the range of 14 to 18 to the range of 70 to 89. The calculated diffusivities, which range from to 10-'6 cmZ/s, decrease with approach to sorption equilibrium and may be markedly reduced under some circumstances by adsorption of molecules from the bulk liquid, causing blockage of pores.Comparison of sorption capacities as a function of silica-alumina ratio as reported by various investigators indicates that considerable differences exist in the properties of acid-leached mordenites of the same silica-alumina ratio but of different origins. SCOPEH-mordenite and acid-leached mordenites have remarkable catalytic activities for acid-catalyzed reactions, but the rate and selectivity of these reactions can be profoundly affected by the rate of counterdiffusion of product and reactant molecules inside the fine pore structure of these zeolites. Acid leaching removes alumina from the silica-alumina matrix and opens up the pores of mordenites, thereby increasing the rate of diffusion. However, leaching also reduces the concenbation of acid sites, thereby presumably decreasing the intrinsic reactivity of the catalyst. The two effects act in opposite directions on the apparent reactivity of the mordenite under diffusionlimiting conditions. A principle objective of this work was to determine quantitatively the effect of acid leaching on diffusivity in mordenites. Diffusion measurements were made by observing the rate of disappearance of a hydrocarbon species A by adsorption from a dilute solution of A in B into mordenite crystals previously saturated with B-termed here adsorption measurements; or by observing the rate of appearance of B from saturated mordenite into bulk liquid consisting initially of pure A-termed here desorption measurements.Sorption capacities for benzene or cumene vapors were also determined as a function of silica-alumina ratio and compared to previous reports on sorption of these and other hydrocarbons. Sorption capacities are of interest in themselves in connection with adsorption processes, and they also provide some insight into the nature of the fine pore structure.

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Hydrocracking and Diffusion of Pure Compounds on Mordenite Catalysts

Cited by 34 publications

References 4 publications

Liquid sorption equilibria of selected binary hydrocarbon systems in type Y zeolites

Liquid sorption equilibria of selected binary hydrocarbon systems in type Y zeolites

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

Sorption and diffusivity characteristics of acid‐leached mordenites

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