Influence of steam partial pressures in the CO2 capture capacity of K-doped hydrotalcite-based sorbents for their application to SEWGS processes

Challenges and strategies for optimization of glycerol steam reforming process

“…A comparison between a commercial hydrotalcite and two potassium and potassium-sodium containing hydrotalcites allowed to conclude that the last one presented the highest adsorption capacity while the potassium containing hydrotalcite presented no significative deactivation after more than 50 cycles of operation [142]. Kdoped hydrotalcite-based sorbents have been reported elsewhere to present a CO2 capture capacity as high as 9 mol·kg -1 at 300 ºC but under wet conditions (Table 9) [141]. Under dry conditions, the maximum value reported was around 1.8 mol·kg -1 (Table 9), which is an outstanding value taken into account the temperature (300 ºC) and that it was not tested under the presence of steam.…”

“…Different materials like hydrotalcites [140][141][142][143][144], CaO-based materials [145][146][147][148][149], lithium zirconates [150][151][152][153][154] and lithium silicates [155][156][157][158][159], among others, have been reported in the literature as CO2 sorbents for SERs applications. It is expected from a good CO2 sorbent to couple in a GSR process to present high CO2 capture capacity and selectivity at moderated temperatures (300-500 ºC), good regenerability (adequate sorptiondesorption kinetics), good hydrothermal and mechanical stability and low-cost [160][161][162][163].…”

Upgrading the Glycerol from Biodiesel Production as a Source of Energy Carriers and Chemicals—A Technological Review for Three Chemical Pathways

“…Losses of particles over the reforming reactions are of about 5% for every 5 min. are thereby adjusted by injection of particles of catalyst and sorbent on the top [74,99,100].…”

“…The different CO 2 sorbents are materials such as hydrotalcites, a group of clay minerals with a structure of hydroxide layers [100,101], lithium zirconates or lithium silicates [102][103][104][105]. The sorption capacity (mol/kg) of K-doped hydrotalcite is significantly high (9.4 mol·kg −1 ) under wet conditions.…”

“…Obviously, the temperature reduction is mandatory for the diminishing of production costs and therefore there is a convenience in working at temperatures in the range of 300-500 • C. Under this range of temperatures, hydrotalcites have been reported as having good performance on the kinetics of CO 2 adsorption capacities, with a special enhancement of that performance under wet conditions typical of GSR processes [100,101]. The sorbent/glycerol ratio is also a relevant variable in GSR.…”