CaO-based sorbents for CO2 capture prepared by ultrasonic spray pyrolysis

Abstract

We report the ultrasonic spray pyrolysis (USP) synthesis and characterization of composite calcium oxide-based sorbents for carbon dioxide capture. Inclusion of a small amount of Al 2 O 3 into the CaO matrix (as low as Al/Ca: 0.03) yielded significant enhancement of resistance to recycling degradation. The effective homogenous dispersion of additives in the CaO matrix and the relatively high surface area materials obtained via USP explain the sorbent's high performance. All materials were characterized by XRD, STEM, TEM, SEM, and TGA (for CO 2 uptake measurements). Two common phases of CaAl x O y , Ca 12 Al 14 O 33 and Ca 3 Al 2 O 6 , were formed during multiple cycles of calcination and CO 2 uptake.

High temperature CO2 sorbents and their application for hydrogen production by sorption enhanced steam reforming process

“…The transition between steps 3 and 4 depends on the precursors used during the synthesis step, which can limit Ca 2+ diffusion into the stabilizer structure for further reaction. (1) Recently, different research groups have developed various synthesis methods with the aim of increasing surface area and pore volume and obtaining high dispersion of inert supports within the sorbent structure: wet mixing [12,63,65,66,68,70], limestone acidification by citric acid followed by two step calcination [71], solid state reaction [72], ultrasonic spray pyrolysis (USP) [73], combination of precipitation and hydration [74], coprecipitation [75], citrate preparation [64], sol-gel [77,79], citrate-assisted sol-gel technique followed by two-step calcination [78], single nozzle flame spray pyrolysis (FSP) [69], and precipitation [80]. [89].…”

Enrichment of Hydrogen Production from Biomass‐Gasification‐Derived Syngas over Spinel‐Type Aluminate‐Supported Nickel Catalysts

“…For the Ni/CaAl 2 O 4 sample, small peaks corresponding to a Ca 12 Al 14 O 33 (JCPDS 09‐0413) phase were observed. Similarly, Ca 12 Al 14 O 33 has been reported to form during multiple calcination cycles …”

“…T 33 has been reported to form duringm ultiple calcination cycles. [26] Thet extural and structural properties of the various supports and catalysts are summarized in Table 1. Thea s-synthe- Table 1), which that reveal a higher macropore ratio for Ni/CaAl 2 O 4 than the other catalysts.Ac omparison of the TEM images ( Figure 2d-f) reveals that the Ni/MgAl 2 O 4 catalyst contains particle aggregates and the largest particles.…”

Stabilized Performance of Al‐Decorated and Al/Mg Co‐Decorated Spray‐Dried CaO‐Based CO2 Sorbents

“…Sayyah et al. adopted 100 vol % CO 2 as the carbonation atmosphere that would overestimate the CO 2 capture performance of synthetic sorbents. Comparatively, the testing conditions used in this work are slightly severe because of the high partial CO 2 pressure during the calcination stage.…”

“… synthesized highly efficient and durable MgO‐decorated CO 2 capture sorbents from calcium D ‐gluconte monohydrate and magnesium D ‐gluconate hydrate using a spray‐drying technique at the earliest stage. Ultrasonic spray pyrolysis (USP) synthesis of composite Al‐decorated CaO‐based sorbents for CO 2 capture was also reported . A combined NaCl‐templating and spray‐drying synthesis method could also be used to easily fabricate mesoporous CaO sorbents for CO 2 capture applications .…”