Pt–Sn/γ-Al2O3 and Pt–Sn–Na/γ-Al2O3 catalysts for hydrogen production by dehydrogenation of Jet A-1 fuel: Characterisation and preliminary activity tests

Abstract

The partial dehydrogenation of fuels like diesel or kerosene cuts to produce H 2 is an emerging idea of increasing interest. In the present work the study of the partial dehydrogenation of Jet A-1 fuel on PteSn/g-Al 2 O 3 based catalysts to produce H 2 to feed an on-board (aircraft) proton exchange membrane fuel cell is presented. Extensive physico-chemical characterization of 5% wt.Pt-1% wt.Sn/g-Al 2 O 3 and 5%wt.Pt-1%wt.Sn-1%wt.Na/g-Al 2 O 3 pelleted materials has been performed. A gradient of the active metals from the edge to the centre of the pellet has been observed. A higher concentration of Pt 0 has been detected on the outer part of the pellet than in the inner part, whereas Sn has been detected only on the external part of the pellet. The investigated materials are active as catalysts for the partial dehydrogenation of normal and desulfurised Jet A-1 kerosene fuel. The presence of sulfur compounds and coke deposition strongly affects the H 2 productivity which decreases rapidly with time on stream. The presence of a Na cation addition contributes to give the highest and most sustained H 2 production. The condensed outlet liquid stream retains the fuel properties in the range of the Jet A-1 kerosene fuel. These are encouraging preliminary results, inviting further research; coking and sulfur poisoning as well as identification of appropriate reaction conditions are the main challenges to be overcome in the immediate future.

High-Purity Hydrogen Generation via Dehydrogenation of Organic Carriers: A Review on the Catalytic Process

“…, and the deactivation is reduced to a loss of 24% activity in 4 h. The activity is considerably higher for both feeds, comparing these to the previous results by Resini et al; 27 however, for Lucarelli et al, 28 no hydrogen purity data is available. The catalysts used are both Pt-Sn-based, and the differences are attributed principally to the higher reaction temperature and feed used by Lucarelli et al 28 They worked with a five-component surrogate, while in the previous case the fuel was a commercial Jet A-1, containing more than 300 compounds.…”

CuZnAl-Oxide Nanopyramidal Mesoporous Materials for the Electrocatalytic CO2 Reduction to Syngas: Tuning of H2/CO Ratio

“…Moreover, it agrees with the water sensitivity of CZA catalysts in the thermocatalysis process [53]. Indeed, the HER is more striking on the CuZA-06-03-01 electrodes, which is correlated to the behavior of alumina-supported catalysts currently employed to reform hydrocarbons suitable for H 2 production by partial dehydrogenation reactions [54]. On the other hand, as already observed for a thermocatalytic system, adding metal oxides (ZnO and Al2O3) to Cu-based catalysts increases the catalyst surface area, contributes to the enhancement of the CO2 adsorption on the catalyst surface, and is useful in tuning the binding energies of *CO, *CHO (or *COH) intermediates, favoring C1 products such as CO and methanol [49,50].…”

Highly Selective and Stable NiSn/SiO2 Catalyst for Isobutane Dehydrogenation: Effects of Sn Addition

“…[42] Generally,t he separation effect of SnO x inhibits the migration and sintering of Pt atoms under high temperature. [57][58] Moreover,t he presence of SnO x also facilitates the migration of cokef rom the active Pt atoms to the support, [59] leading to good stability. Nevertheless, Sn should be reduced prior to the reaction with regard to the Ni/Sn catalyst, as the formation of the NiSn alloy is indispensable for dehydrogenation.…”