期刊
CHEMICAL ENGINEERING JOURNAL
卷 429, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132448
关键词
Open cell foams; Palladium; Cobalt spinel; Kinetic and mass transfer regimes; Heat transfer effects
资金
- Italian Ministry of Education, University and Research (MIUR, Italy) via the ERANETMED network (SOLCARE project) [ENERG-065]
In this study, a combination of silicon carbide and zirconia open cell foams coated with PdO/Co3O4 catalyst were tested for methane oxidation, with the best results achieved when the two supports were used in series with different thermal conductivities. Mass transfer effects, external and internal heat transfer effects were evaluated, and comparisons were made in terms of volumetric heat transfer coefficient and heats of removal/reaction.
For catalytic process intensification, a series of open cell foams (OCFs) made of silicon carbide (SiC) and zirconia (Zir) with pore density of 30 ppi coated with 3 wt% PdO/Co3O4 as catalyst were combined together and tested toward methane oxidation in lean conditions. In each combination, the SiC OCF was positioned in the reactor on the inlet side of the reactant gases followed by the Zir OCF. The reactor was fed at different weight hourly space velocities (WHSV, 30 and 90 NL h(-1) g(cat)(-1)) and inlet methane concentrations (0.5 and 1 vol%). The best results are obtained with the combination where two supports of same length but with different thermal conductivity (higher at the inlet of the reactor, SiC, and lower at the outlet, Zir) are used in series. For all OCF combinations, mass transfer effects were evaluated using the characteristic resistances (kinetic, internal and external mass transfer). The external and internal heat transfer effects were analyzed using the Mears and Anderson criteria. Furthermore, a comparison in terms of volumetric heat transfer coefficient and heats of removal/reaction was performed.
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