Calcium cobaltate: a phase-change catalyst for stable hydrogen production from bio-glycerol

Abstract

Layered calcium cobaltates exhibit a very stable performance in SESR of glycerol producing hydrogen because of a reversible phase change.

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

“…Overall, the reports summarized above show clearly that a better fundamental understanding of the mechanisms through which alkali-based promoters and carbonates enhance the uptake of Calcium cobalt oxide has been used in the sorption-enhanced steam reforming of glycerol to produce hydrogen of high purity [448]. Under reforming conditions, the calcium cobalt oxide decomposes to cobalt (oxide) and CaO, which absorbs the CO2 co-produced and thereby enables higher yields of the reforming product hydrogen; the cobalt functions as a reforming catalyst.…”

“…CH4 [671]- [674], biomass [413], glycerol [448], [675]- [678] or ethanol [679]- [682]), to capture CO2 at a high efficiency for a long time, and possibly to enable redox-reactions simultaneously for a better heat integration [683]- [686]. Combining these functionalities in a single particle (bi-functional or tri-functional catalyst-sorbent [687]) would maximize the heat integration of the different sub-reactions, but the design of such multifunctional materials is challenging so that typically separated particle systems (i.e.…”

Intensification of Chemical Looping Processes by Catalyst Assistance and Combination

“…What to do? A possible solution can be provided by chemical looping [7][8][9][10][11][12][13][14][15][16], a promising technology of low emission, with applications in electricity or heat production, as well as in chemicals and fuels. This novel technology is rapidly evolving towards an established "clean combustion" due to the intrinsic, very efficient CO2 separation.…”

Bi-functional Ru/Ca3Al2O6–CaO catalyst-CO2 sorbent for the production of high purity hydrogen via sorption-enhanced steam methane reforming

“…[21][22][23] In addition, material migration during CO 2 uptake and regeneration may block the active sites of the catalyst. In order to overcome the sintering-induced deactivation, approaches that incorporate an structural stabilizer such as Mg x Al y O z , 24 24,25,33 have been typically required to obtain materials with acceptable SMR activity. However, such high catalyst loadings lead to a reduced CO 2 uptake capacity per gram of material, thus, affecting negatively the economics of the SE-SMR process.…”