n-Octane reforming over modified catalysts

Fürcht, Ákos; Tungler, Antal; Szabó, S.; Schay, Z.; Vida, László; Gresits, I.

doi:10.1016/s0926-860x(02)00048-0

Cited by 17 publications

(13 citation statements)

References 22 publications

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“…F ü rcht et al modifi ed Pt -Sn/ -Al 2 O 3 by addition of Te, Bi [89] or Au, Ir and Pd [90] by the refi lling method. F ü rcht et al modifi ed Pt -Sn/ -Al 2 O 3 by addition of Te, Bi [89] or Au, Ir and Pd [90] by the refi lling method.…”

Section: Naphtha Reformingmentioning

confidence: 99%

Multimetallic Nanoparticles Prepared by Redox Processes Applied in Catalysis

Epron

Especel

Marécot

2007

Nanoparticles and Catalysis

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280 Multimetallic Nanoparticles Prepared by Redox Processes Applied in Catalysistechniques differ according to this last step. Indeed, four preparation methods can be chosen as a function of the reversible Nernst potential of the different species involved in the preparation procedure, namely (i) direct redox reaction (process also called " cementation " ) between the " parent " metal and the oxidized form of the modifi er, (ii) redox reaction between an adsorbed reducing agent and the oxidized form of the modifi er, (iii) catalytic reduction and (iv) underpotential deposition. According to these techniques, trimetallic catalysts can also be prepared by replacing the parent monometallic catalyst with a bimetallic one. This can be extended to the preparation of multimetallic catalysts. Preparation of Bimetallic Catalysts by Direct Redox ReactionIn this case, metal -metal interactions result from surface redox reactions between the prereduced parent metal M and the oxidized form of the modifi er M ′ Z ′ + .The half reaction corresponding to the oxidation of the parent metal is the following:

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Section: Naphtha Reformingmentioning

confidence: 99%

Multimetallic Nanoparticles Prepared by Redox Processes Applied in Catalysis

Epron

Especel

Marécot

2007

Nanoparticles and Catalysis

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“…It was explained that the acid copolymer used as a support could act as a buffer on the catalytic sites where the reaction occurs, thus improving the selectivity towards nitrogen. [129] The refilling and the catalytic reduction methods also enabled the preparation of trimetallic catalysts, such as Pt-Ir-Sn [121,122] , Pt-Ir-Ge [138][139][140] , Pt-Re-Ge [138,140,141] , Pt-Re-Sn [142,143] , Pd-Sn-Au [144] , Pt-Ru-Sn [145] , Pt-Ru-Mo [145] , Pt-Sn-Te [146] , Pt-Sn-Bi [146] , Pt-Sn-Au [147] , Pt-Sn-Ir and Pt-Sn-Pd [147] .…”

Section: Hydrogen As Reducing Agentmentioning

confidence: 99%

“…In the area of naphtha reforming, the Szabo's group modified Pt-Sn/γ-Al2O3 by addition of Sn, Te, Bi [146] or Au, Ir and Pd [147] by the refilling method whereas Pieck et al , in Santa Fe (Argentina) in collaboration with the group of Poitiers, studied several Pt based trimetallic catalysts prepared by catalytic reduction (Pt-Ir-Ge [138][139][140] , Pt-Re-Ge [138,140,141] , Pt-Re-Sn [142,143] ). The results indicate that both methods are suitable for preparing trimetallic catalysts and in general the addition of the third metal modifies the properties of both the metal and acid functions of the bimetallic catalysts.…”

Section: Hydrogen As Reducing Agentmentioning

confidence: 99%

Bimetallic Catalysts for Sustainable Chemistry: Surface Redox Reactions For Tuning The Catalytic Surface Composition

2023

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The development of a bimetallic catalyst for a given reaction requires not only the selection of the appropriate metals M1 and M2 but also the control as far as possible of the distribution of the two metals together and at the support surface in the case of supported catalysts.Preparation methods using redox reactions specifically enable the deposition of a second metal M2 at the surface of monometallic M1 nanoparticles, leading in most cases to core-shell nanoparticles with strong metal-metal interactions. Various methods are possible depending on the electrochemical potentials of the species involved: either a direct redox reaction, also named galvanic replacement, or the reduction of an intermediate reducing agent activated at the surface of M1. In this minireview, the fundamental bases of the preparation of bimetallic catalysts by both types of redox reactions and the recent advances in that domain are described.

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“…Since the concentrations of Pt, Re and Sn are too small and they contributed in the catalyst system as amorphous materials, hence no peaks of these metals were detected. Furcht et al [16] reported that when the support is alumina for Pt reforming catalyst, the Pt 4f peak usually cannot be detected because of the large Al 2p peak of the support, while the smaller Pt 4d signal was below the detection limit. Indeed, this result demonstrated that the structure of the parent catalyst network didn't collapse as a result of anchoring with Sn species.…”

Section: Characterizationmentioning

confidence: 99%

Optimization of Isomerization Activity and Aromatization Activity in Catalytic Naphtha Reforming over Tri-Metallic Modified Catalyst using Design of Experiment Based on Central Composite Design and Response Surface Methodology

Elfghi¹,

Amin²,

Elgarni³

2015

J. Adv. Catal. Sci. Techno.

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In this work, the estimation capacity of the response surface methodology (RSM), in the catalytic naphtha reforming to enhance the octane number of reformats via isomerization reaction pathway and minimize the aromatization activity over tri-metallic modified Pt-Re/Al2O3 catalyst were investigated by applying Design of experiment (DOE). The parent bimetallic catalysts were modified using a relatively inactive metal (Sn) by means of employing non-conventional method of anchoring technique called controlled surface reaction (CSR) method in order to favor the intimate contact of Sn with the active phase to suppress the metallic character of Pt metal. The correlations between RON, aromatization and isomerization activities with three reaction variables namely temperature (480-510 o C), pressure (10-30 bar) and space velocity LHSV (1.2-1.8 h-1) were presented as empirical mathematical models via reforming of a complex mixture (80 o C-185 o C). Numerical results indicated that the minimum aromatization activity was 20% when reaction temperature was 460 o C and pressure of 35 bar. Results also show that maximum isomerization activity of 58% was achieved when pressure is 30 bar and space velocity is 1.8 h. it has been found that optimum value of RON = 89 was attained at 449.9 o C, 32 bar and 1.7 h-1. However, high operating pressure and low reaction temperature significantly decrease the aromatization activity coupled with substantial decrease in RON which can be enhanced by producing high yield of isomers.

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n-Octane reforming over modified catalysts

Cited by 17 publications

References 22 publications

Multimetallic Nanoparticles Prepared by Redox Processes Applied in Catalysis

Multimetallic Nanoparticles Prepared by Redox Processes Applied in Catalysis

Bimetallic Catalysts for Sustainable Chemistry: Surface Redox Reactions For Tuning The Catalytic Surface Composition

Optimization of Isomerization Activity and Aromatization Activity in Catalytic Naphtha Reforming over Tri-Metallic Modified Catalyst using Design of Experiment Based on Central Composite Design and Response Surface Methodology

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