Non Monotonous Product Distribution Dependence on Pt/γ‐Al₂O₃−Cl Catalysts Formulation in n‐Heptane Reforming.

Abstract

The synthesis of 19 carefully selected Pt/γ-Al 2 O 3 À Cl formulations was followed by high-throughput catalytic testing in order to unravel the effect of an active phase formulation change on nheptane reforming performances. Pt/γ-Al 2 O 3 À Cl catalysts were prepared with different Pt (0.3-1 % wt ) and Cl (0.1-1.4 % wt ) contents and using two γ-Al 2 O 3 supports so that both sites concentrations and sites locations at the crystallite surface vary among the catalyst pool. Catalytic tests were conducted in mild conditions for a comparison of catalysts in kinetic regime.Results show that Pt and Cl concentrations control the competition between hydroisomerisation, hydrogenolysis and hydrocracking pathways. Aromatisation, on the contrary, is poorly affected by formulation changes. Non-monotonous trends linking Pt/Cl ratio to isomerisation selectivity are found for both γ-Al 2 O 3 supports. This study provides new insights for the description of bi-functional transformations in catalytic naphtha reforming.

Kinetic modelling of Pt/γ-Al2O3–Cl catalysts formulation changes in n-heptane reforming

“…This can be compared to the experimental observation according to which it is the competition between hydrogenolysis and hydroisomerisation reactions that was mainly affected by formulation variations. 15 Hydrogenolysis and naphthene dehydrogenation pathways were expected to be catalysed by the metallic phase only. As illustrated on…”

“…A dedicated article reports the catalytic testing experiments that are modelled in this kinetic study. 15 Low to medium conversion ranges (up to 70%) were explored in mild conditions. 97.5 to 100% of the hydrocarbons detected by gas chromatography flame induction detector are C 1 -C 7 paraffins, naphthenes and aromatics.…”

“…Deactivation phenomena are also neglected in this model. The validity of these hypotheses was checked during the experimental validation phase (see 15,18 ). An ideal gas thermodynamic model was arbitrarily chosen.…”

“…Results have already been published and describe the effect of catalyst formulation over a broad range of mild nheptane reforming conditions. 15 The present article presents a kinetic model using power law kinetics and gathering reforming reactions into families through Linear Free Energy Relationships (LFER). This model describes the impact of an active phase formulation change on a limited number of apparent rate constants.…”

Highly Versatile, Non‐noble Metal‐Based Catalytic Process for the Production of Green Aromatics and High‐Octane Fuel from Bio‐Derived Hydrocarbon Mix

“…[2,8,17,18] Conversion of unconventional feeds like bio-derived hydrocarbon mix obtained during bio-diesel synthesis, naphtha obtained during waste plastic-to-fuel conversion or crudederived hydrocarbon mix into chemicals is in the early stage of development and has tremendous scope for improvement. [19] Recently production of aromatics from bio-derived naphtha/ bio-oil has been studied using noble metals and some of the non-noble metal-based catalysts like Pd/γ-Al 2 O 3 , [20] Pt/γ-Al 2 O 3 -Cl [21] and Fe/H-ZSM-5, [22] Ni/γ-Al 2 O 3 , [23] Mo-Ga/ZSM-5, [24] Ni/ZSM-5, [25] etc. Use of non-noble metal-based catalyst is desirable to improve process economics.…”