Co-Fe-Si Aerogel Catalytic Honeycombs for Low Temperature Ethanol Steam Reforming

Abstract

Cobalt talc doped with iron (Fe/Co~0.1) and dispersed in SiO 2 aerogel was prepared from silica alcogel impregnated with metal nitrates by supercritical drying. Catalytic honeycombs were prepared following the same procedure, with the alcogel synthesized directly over cordierite honeycomb pieces. The composite aerogel catalyst was characterized by X-ray diffraction, scanning electron microscopy, focus ion beam, specific surface area and X-ray photoelectron spectroscopy. The catalytic layer is about 8 µm thick and adheres well to the cordierite support. It is constituted of talc layers of about 1.5 µm × 300 nm × 50 nm which are well dispersed and anchored in a SiO 2 aerogel matrix with excellent mass-transfer properties. The catalyst was tested in the ethanol steam reforming reaction, aimed at producing hydrogen for on-board, on-demand applications at moderate temperature (573-673 K) and pressure (1-7 bar). Compared to non-promoted cobalt talc, the catalyst doped with iron produces less methane as byproduct, which can only be reformed at high temperature, thereby resulting in higher hydrogen yields. At 673 K and 2 bar, 1.04 NL H2 ·mL EtOH(l)

Concentrated Platinum‐Gallium Nanoalloy for Hydrogen Production from the Catalytic Steam Reforming of Ethanol

“…[18,19] Recently, researchers are also finding ways to optimize the yield and selectivity of the products at lower temperature ranges over various catalysts. In this regard, various base and noble metals, such as Pt [20][21][22] Ir, [23] Ru, [24] Pd, [25] Rh, [26][27][28][29] Co, [30][31][32][33] Zn, [34] Al, [35] Cu, [36] and Ni [37,38] have been implemented so far for SRE. The activation pathway for ethanol can be influenced by the nature of the metal surface and is generally categorized into two groups i. e. more-oxophilic metal group (Ru, Ni, Rh, Co) that initiates through OÀ H activation and the less-oxophilic metal group (Pt and Pd) where the α-CÀ H activation occurs.…”

Hydrogen Production by Steam Reforming of Ethanol on Rh-Pt Catalysts: Influence of CeO2, ZrO2, and La2O3 as Supports

“…The ability of base metals, such as Ni [5,7,10,11], Cu [3,7], Al [12], Zn [13], and Co [14][15][16][17], and noble metals, such as Pt [18], Rh [19][20][21][22], Pd [23], Ru [24], and Ir [25], supported on various metal oxides to catalyze the SRE has been widely investigated. Ethanol activation pathways depend on the metal nature, and can be generally divided in two groups: the less-oxophilic metals (Pd and Pt) in which α-C-H activation takes place, and the more-oxophilic metals (Co, Ni, Rh, Ru) that promote activation via O-H.…”

Response Surface Methodology and Aspen Plus Integration for the Simulation of the Catalytic Steam Reforming of Ethanol

“…Nonsignificant terms in the "Coded Factors" ("Probability F" > 0.1) indicate that this effect has no relevance to the response, and they were not included. Meanwhile, the "Actual Factors" of Table 3 can be used to make predictions about the response for given levels of each factor, replacing them in the quartic model shown in Equation (17). The mathematic model from the "Actual Factors" can be used for simulations in commercial software in order to obtain preliminary energy information about the process.…”

“…NRTL-RK was used as thermodynamic package in the simulations in order to simultaneously model condensable and non-condensable compounds present in hydrocarbon reforming [39,77]. This allowed the results of the simulations to be downloaded directly into Excel and used in the mathematical models obtained from the RSM, replacing the "Actual Factors" of Table 3 in Equation (17). The percentage error between the experimental data and the results of the RSM and Aspen Plus integration was calculated according to Equation (21), where Error is the relative error, D exp is the experimental data, and D simu is the result obtained by RSM-Aspen Plus integration.…”

“…Currently, bioethanol is blended with gasoline (8-10 vol %) in transport applications. However, the use of ethanol/gasoline mixtures in Base metals, such as Ni [15], Co [16], and Fe [17], and noble metals, such as Pd [18], Rh [18,19], Pt [7,20], and Ir [21], supported on metals oxides to catalyze SRE have been widely studied. The nature of the catalyst and operational conditions directly affect its performance in SRE [15,22].…”