2 research outputs found
Self-Reactivated Mesostructured Ca–Al–O Composite for Enhanced High-Temperature CO<sub>2</sub> Capture and Carbonation/Calcination Cycles Performance
In
this study, highly efficient high-temperature CO<sub>2</sub> sorbents
of calcium aluminate (Ca–Al–O) mesostructured
composite were synthesized using presynthesized mesoporous alumina
(MA) as a porous matrix to react with calcium nitrate through a microwave-assisted
process. Upon annealing at 600 °C, a highly stable mesoporous
structure composed of poorly crystalline Ca<sub>12</sub>Al<sub>14</sub>O<sub>33</sub> phase and the CaO matrix was obtained. The Ca–Al–O
mesostructured sorbents with a Ca<sup>2+</sup>/Al<sup>3+</sup> ratio
of 5:1 exhibit an enhanced increasing CO<sub>2</sub> absorption kinetics
in the CO<sub>2</sub> capture capacity from 37.2 wt % to 48.3 wt %
without apparent degradation with increasing carbonation/calcination
cycling up to 50 at 700 °C due to the strong self-reactivation
effect of the mesoporous Ca–Al–O microstructure. Remarkable
improvements in the CaO-CaCO<sub>3</sub> conversion attained from
the mesostructured Ca–Al–O composite can be explained
using the concept combined with available mesoporous structure and
Ca<sub>12</sub>Al<sub>14</sub>O<sub>33</sub> phase content. However,
a high Ca<sup>2+</sup>/Al<sup>3+</sup> =8:1 Ca–Al–O
composite causes degradation because the pores become blocked and
partial sintering induces CaO agglomeration
Additional file 1: of Characterization of the hepatitis B virus DNA detected in urine of chronic hepatitis B patients
Urine DNA analysis by qPCR assays targeting multiple locations in the HBV genome. Raw data for Fig. 2. (XLSX 18 kb