Developing
novel sorbents with maximum carbonation efficiency and
good cycling stability for CO2 capture is a promising route
to sequester anthropogenic CO2. In this work, we have employed
a green synthesis method to synthesize CaO-based sorbents suitably
stabilized by MgO and supported by in situ generated
carbon under inert atmosphere. The varied amounts (10–30 wt
%) of MgO were used to stabilize the CaO. The supported mixed metal
oxide (MMO) sorbents were screened for high-temperature CO2 capture under CO2 rich (86% CO2) and lean
(14% CO2) gas streams at 650 °C and atmospheric pressure.
The MMO sorbents captured 53–63 wt % of CO2 per
gram of sorbent under 86 and 14% CO2, accounting for about
98% carbonation efficiency, which outperforms the CO2 capture
capacity of limestone derived CaO (L-CaO) sorbents (22.8 wt %). All
of the synthetic MMO sorbents showed greater capture capacity and
cyclic stability when compared to benchmark L-CaO. Because of the
high carbonation efficiency and cycling stability of g-Ca0.69Mg0.3O sorbent, it was tested for 100 carbonation/regeneration
cycles of 5 min each under CO2 lean conditions. The g-Ca0.69Mg0.3O sorbent showed exceptional CO2 capture capacity and cycling stability and retained about 65% of
its initial capture capacity after 100 cycles.
Platinum nanoparticle intercalated magnesiumaluminum layered double hydroxide (LDH) composite was prepared by restacking the colloidal dispersion of organically modified LDH in the presence of preformed oleylamine capped platinum nanoparticles in n-butanol. The resultant nanocomposite was characterized using powder X-ray diffraction (PXRD), infrared (IR) spectroscopy, transmission electron microscopy (TEM), selected area electron diffraction and energy dispersive X-ray spectroscopy (EDX). The PXRD pattern of the composite indicates an expanded interlayer due to the intercalation of the Ptnanoparticles into the LDH interlayer region. PXRD patterns along with the IR spectra confirm the formation of the precursors and the composite. TEM image of Pt-nanoparticles shows spherical particles with an average particle size of *3 nm and that of the composite shows dispersed Pt-nanoparticles on the LDH matrix. The presence of Pt, Mg and Al in the composite is indicated in the EDX data.
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