CFD modeling and experimental validation of sulfur trioxide decomposition in bayonet type heat exchanger and chemical decomposer for different packed bed designs

Sulfur trioxide electrolysis studies: Implications for the sulfur–iodine thermochemical cycle for hydrogen production

“…Group I and II elements (the alkaline metals and alkaline earths), the rare earths, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ag, In, Sn, Pb, and Bi all form sulfates that are more stable than their oxides and therefore their oxides cannot be incorporated in any component that comes into contact with sulfur. For purely structural components, silicacoated metal at moderate temperatures (<600 C) or silicacoated SiC at high temperatures would be cost effective [10]. The implications of the limited materials selection on SO 3 electrode materials development and electrolyzer design are much more complicated.…”

“…(3) for the SeI thermochemical cycle shown in Section 1 is typically carried by thermal decomposition of SO 3 to SO 2 [10]. Due to Le Chatlier's principle, the SO 3 to SO 2 conversion reaction reaches an equilibrium point that inhibits the conversion of 100% of the SO 3 to SO 2 .…”

Numerical study of heat transfer and sulfuric acid decomposition in the process of hydrogen production

“…For the nonporous media region, S i is equal to 0, while for the porous media region, S i includes the viscous and inertial loss terms. The inertial and viscous resistance coefficients are based on the catalyzer pellet diameter and porosity as follows: where D p is the pellet diameter and ε is the porous region porosity. The reciprocals of a (m 2 ) and C 2 (1/m) were used as the viscous and inertial resistance coefficients.…”

“…For the nonporous media region, S i is equal to 0, while for the porous media region, S i includes the viscous and inertial loss terms. The inertial and viscous resistance coefficients 23 are based on the catalyzer pellet diameter and porosity as follows 31 :…”

Sulphur trioxide decomposition with supported platinum/palladium on rutile catalyst: 2. Performance of a laboratory fixed bed reactor

“…The results were obtained under unsteady state conditions involving variation of temperature and pressure and the effect on conversion. A bayonet type decomposer was successfully constructed, modelled and validated by Nagarajan et al [22] using a catalyst consisting of 1 wt.% platinum supported on silica at pressures of 1e5 bar and an inlet temperature of 923 K. Connolly et al [23] designed a multistage decomposer consisting of a combined bayonet type reactor system with pre-heating, concentrating and decomposition of sulphuric acid. Regarding solar heated reactors a number of solar reactors have been modelled and evaluated experimentally.…”