Pt-KL zeolite catalysts of different preparation

Manninger, I.; Zhan, Zhaoqi; Xu, Xian Lun; Paál, Z.

doi:10.1016/0304-5102(91)80016-v

Cited by 22 publications

(6 citation statements)

References 36 publications

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“…The interplay between metallic and acidic sites, on the one hand, or metallic and alkaline sites, on the other hand, may result in remarkable changes in this transition region, too. A slightly acidic 0.8% Pt supported on KL zeolite produced still some isomers from n-hexane, and the ratio benzene/fragments was 1.7 at 420 °C (Manninger et al, 1991). The same value was obtained Ind.…”

Section: Is There Any Single "Authentic" Reaction Route Of Reforming?supporting

confidence: 74%

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Some Aspects of the Mechanisms of Catalytic Reforming Reactions

Menon

Paál

1997

Ind. Eng. Chem. Res.

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A brief review is given of the evolution of our ideas on the mechanism of catalytic reforming reactions over the last 40 years. The early bifunctional reaction mechanism, though criticized much, led first to an understanding and optimization of the reforming process and later to several other catalyst and process innovations. Kinetic and tracer studies on model catalysts using single hydrocarbons as reactants and the surface-science approach revealed the finer nuances of the mechanism involved. Simultaneously, the roles of S, Cl, coke, and hydrogen and of a second metal component like Re, Ir, or Sn in the industrial catalyst were also understood to a greater or lesser extent. All these results make the mechanism of reforming reactions a field of fascinating complexity in fundamental and industrial catalysis.

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Section: Is There Any Single "Authentic" Reaction Route Of Reforming?supporting

confidence: 74%

“…A slightly acidic 0.8% Pt supported on KL zeolite produced still some isomers from n-hexane, and the ratio benzene/fragments was 1.7 at 420°C (Manninger et al, 1991). The same value was obtained on a 6% Pt/SiO 2 catalyst.…”

Section: Is There Any Single "Authentic" Reaction Route Of Reforming?supporting

confidence: 58%

Some Aspects of the Mechanisms of Catalytic Reforming Reactions

Menon

Paál

1997

Ind. Eng. Chem. Res.

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“…W drugim etapie przeprowadza się proces redukcji w celu uzyskania fazy aktywnej w postaci metalicznych cząstek. Prekursory metali szlachetnych łatwo redukują się w obecności wodoru [78,86] lub borowodorku sodu [86]. Niekiedy do otrzymywania fazy metalicznej stosuje się łagodniejsze reduktory takie jak kwas cytrynowy czy kwas askorbinowy [87].…”

Section: Osadzanie-redukcjaunclassified

Katalizatory Złotowe Osadzone Na Zeolitach

Walkowiak¹

2021

WiadChem

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Wykaz stosowanych symboli i oznaczeń WprowadzenieMgr Adrian Walkowiak urodził się 3 maja 1996 r. w Wolsztynie. W 2020 r. ukończył studia magisterskie na Wydziale Chemii Uniwersytetu im. Adama Mickiewicza w Poznaniu, broniąc pracy pt. "Katalizatory złotowe bazujące na zeolitach Beta, Nb/Beta i Ce/Beta -wpływ metod preparatyki na właściwości powierzchni". W tym samym roku rozpoczął kształcenie w Szkole Doktorskiej UAM. Od 5 lat związany jest z Zakładem Katalizy Heterogenicznej, gdzie aktualnie realizuje pracę doktorską pod kierunkiem prof. Marii Ziółek. Jest współautorem 6 artykułów w renomowanych czasopismach naukowych.

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“…The aromatization of n-hexane to benzene goes by the ring closure, which proceeds either via a stepwise dehydrogenation (n-hexane-hex ene-hexadiene-hexatriene) or via intermediates bound to the surface by a carbon-like or carbine-like bonds, possibly in combination with a p-complexing of the olefinic bond in the intermediate [37]. Manninger et al [38] expressed a very interesting view that the presence of alkali cations can influence the formation of the intermediates adsorbed on Pt; considered as a sterical or electronic field effect. The aromatization of nhexane to benzene is accompanied by the formation of methylcyclopentane, which is then dehydroisomerized into benzene (Scheme 2).…”

Section: Dehydrocyclization Of N-hexanementioning

confidence: 99%

Influence of Pt nanoparticles modified by La and Ce oxides on catalytic dehydrocyclization of n-alkanes

A.H.Samia

Mohammed

Faramawy

et al. 2015

Egyptian Journal of Petroleum

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Catalytic reforming accounts for a large share of the world's gasoline production, it is the most important source of aromatics for the petrochemical industry. In addition, reforming of hydrocarbon on the dual-function catalysts has been found to form fundamentally different products in hydrogen diluents. Typical catalysts employed for this reforming process are Pt/Al 2 O 3 and Pt-M/Al 2 O 3 , M being the promoter. These solids are characterized by both acid and metal functions which catalyze dehydrocyclization, dehydrogenation, isomerization and cracking processes. In this regard, information about cerium and lanthanum, as promoters, is hardly revealed. The present work aims to study the performance of Pt/Al 2 O 3 catalysts modified by lanthanum or cerium during the conversion of cyclohexane, n-hexane and n-heptane. Catalytic activities of the prepared catalysts were tested using a micro catalytic pulse technique. Physicochemical characterization of the solid catalysts such as, surface area (S BET ), Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), hydrogen-temperature programed reduction (H 2 -TPR), hydrogen-temperature-programed desorption (H 2 -TPD), CO 2 -TPD, NH 3 -TPD, high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) were depicted. Results indicated clearly that Pt/Al 2 O 3 catalyst is selective toward dehydrogenation to benzene which could be explained as due to the decrease in the active acid sites and the comparative segregation of the alumina support especially at 3% load of CeO. The presence of La 2 O 3 in the Pt/Al 2 O 3 catalyst promotes aromatization of n-hexane and n-heptane, also the dehydrocyclization of n-hexane is more difficult than that of n-heptane. Thus, modification of the Pt/Al 2 O 3 catalyst by La, resulted in a more active and selective reforming catalyst. ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of Egyptian Petroleum Research Institute. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

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Pt-KL zeolite catalysts of different preparation

Cited by 22 publications

References 36 publications

Some Aspects of the Mechanisms of Catalytic Reforming Reactions

Some Aspects of the Mechanisms of Catalytic Reforming Reactions

Katalizatory Złotowe Osadzone Na Zeolitach

Influence of Pt nanoparticles modified by La and Ce oxides on catalytic dehydrocyclization of n-alkanes

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