Reforming of Ethanol to Produce Hydrogen over PtRuMg/ZrO₂Catalyst

Abstract

A modified PtRu/ZrO 2 catalyst with Mg is evaluated for the oxidative steam reforming of ethanol (OSRE) and the steam reforming of ethanol (SRE). In order to understand the variation in the reaction mechanism on OSRE and SRE, further analysis of both fresh and used catalyst is concentrated on for TEM, TG, Raman, and TPR characterization. The results show that the OSRE reaction requires a higher temperature (T R ∼ 390 • C) to achieve 100% ethanol conversion than the SRE reaction (T R ∼ 2500 • C). The distribution of CO is minor for both reactions (< 5% for OSRE, < 1% for SRE). This demonstrates that the water gas shift (WGS) reaction is an important side-reaction in the reforming of ethanol to produce H 2 and CO 2. A comparison of the temperature of WGS (T WGS) shows it is lower for the SRE reaction (T WGS ∼ 250 • C for SRE, ∼340 • C for OSRE).

Steam reforming and oxidative steam reforming for hydrogen production from bioethanol over Mg2AlNiXHZOY nano-oxyhydride catalysts

“…Moreover, it has to be noted that a higher catalyst mass is used for SRE conditions and to be recalled that much lower energy (extra heating at only 50 C) is required here for OSRE. Clearly, the conversion of ethanol is increased significantly by the addition of O 2 into the reactant mixture, as often accepted in the literature, even if there are some exceptions [9,16,17,20,24]. Moreover, for the same EtOH concentration, lower carbon formation is obtained in OSRE, in agreement also with literature.…”

“…ethanol conversion than the SRE reaction [20]. The H 2 O/EtOH molar ratio was 13 for the SRE reaction, while the O 2 /EtOH molar ratio was 0.26, and the H 2 O/EtOH molar ratio was 4.86 for the OSRE reaction.…”

“…The H 2 O/EtOH molar ratio was 13 for the SRE reaction, while the O 2 /EtOH molar ratio was 0.26, and the H 2 O/EtOH molar ratio was 4.86 for the OSRE reaction. In their case a more pronounced coke formation was observed in the OSRE reaction [20]. Palma et al studied PteNi/CeO 2 /SiO 2 catalysts in the 300e600 C temperature range applying a H 2 O/EtOH molar ratio of 4 and an O 2 / EtOH molar ratio of 0.5 in OSRE conditions [24,25].…”