Study of the performance of Rh/La2O3–SiO2 and Rh/CeO2 catalysts for SR of ethanol in a conventional fixed-bed reactor and a membrane reactor

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

“…RhPt/La2O3 (Figure 2c) showed increased H2 production until stabilization was observed around 64 mol%. Da Silva et al [44] reported a stable product distribution during total ethanol conversion on 0.6%Rh/La2O3-SiO2 and 0.6%Rh/CeO2 catalysts for the SRE during 28 h TOS (500 °C; H2O:ethanol, molar ratio 3:1; 2.5% ethanol; 30 mL/min gas stream). In the current study, the total gas feed and temperature were extreme, looking forward to affecting the catalyst stability faster, in order to see possible differences between the supported catalysts.…”

“…ZrO2 and La2O3 showed larger amounts of ethylene than CeO2, which could result from a major contribution from the dehydration of ethanol (Equation (8)) instead of the dehydrogenation reactions. This phenomenon can be ascribe to a lower oxygen storage capacity of these supports at 700 °C compared with CeO2 [43,44], which could cause a failure to degrade C2 intermediates.…”

Enhanced hydrogen production from thermochemical processes

“…161 Instead, the permeate flux can be improved by magnifying the permeation driving force. This can be achieved by using a sweep gas (generally Ar 101,124 and N2 135,136,139,148 ) on the permeate side to maintain a high H2 pressure gradient between the two sides of the membrane. However, the use of sweep gas is not desirable, as the purified H2 is mixed with another gas, therefore, defeating the purpose of using membranes for gas separation.…”

Hydrogen production by steam reforming of ethanol on a RhPt/CeO2/SiO2 catalyst: Synergistic effect of the Si:Ce ratio on the catalyst performance

“…Specifically, SiO 2 has a higher surface area and larger average pore size, which allows for a better dispersion and stabilization of the metals [23]. These features allow for the integration of SiO 2 into the matrices mixed with other carriers to promote higher activity, selectivity, and stability [24], and allow the exploitation of the advantages of both materials. This study aims to identify an active, selective, and stable catalyst for H 2 production from SRE for its further use with real bioethanol samples and under FC operation conditions.…”

“…1f) and the coke formation (Section 3.3.4). Some catalysts used in the SRE have a deficiency to reform CH 4 and a favorability to produce ethylene, which was linked to excessive acid sites in the catalysts [22,24,40]. Therefore, RhPt/CeSi-33 could provide an interesting equilibrium between basicity (to maximize H 2 and avoid excess of ethylene and coke formation) and acidity (to promote CH 4 formation and H 2 O activation), which would provide a very active and selective catalyst for the SRE.…”