Effect of added basic metal oxides on CO2 adsorption on alumina at elevated temperatures

Horiuchi, Tatsuro; Hidaka, Hiroaki; Fukui, Takehisa; Kubo, Yukio; Horio, Masao; Suzuki, Kenzi; Mori, Toshiaki

doi:10.1016/s0926-860x(97)00318-9

Cited by 106 publications

(58 citation statements)

References 18 publications

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Section: Materials Selectionmentioning

confidence: 99%

“…Alkali and alkaline earth metals form bulk carbonates, and the adsorption of CO 2 on oxides of these metals is characterized by large H ∆ on the order of 160 kJ/mol at low surface coverage [Horiuchi, 1998a]. At similar coverage, rare earth oxides have H ∆ of about 100-140 kJ/mol [Horiuchi, 1998a]; perovskites have lower H ∆ on the order of 50 kJ/mol [Kusakabe, 1994], [Martin, 1981], [Liu, 2005]. Notably, the interaction of CO 2 with basic sites on metal oxides, including perovskites, rare earth oxides and semiconducting oxides, is important in metal oxide-catalyzed reactions such as oxidative coupling of methane, CO 2 reforming of methane, and water gas shift [Tsuji, 2003], [Liu, 2005], [Istadi, 2004].…”

Section: Materials Selectionmentioning

confidence: 99%

“…Dopant cations were chosen based on adsorption data and their tendency to form basic oxide materials. Horiuchi et al [Horiuchi, 1998a] measured retention time of CO 2 on oxide-modified aluminas. Rare earth oxides, alkali metal oxides and alkaline-earth oxides were all shown to increase the retention time of CO 2 .…”

Section: Synthesis Of Functionalized Mesoporous Membranesmentioning

confidence: 99%

“…Three dopant cations were selected for study: the two alkaline earth elements Mg and Sr and one rareearth element La. Horiuchi, et al [Horiuchi, 1998a] observed that those elements increased the CO 2 retention on alumina in the order Sr>La>Mg.…”

Section: Synthesis Of Functionalized Mesoporous Membranesmentioning

confidence: 99%

See 3 more Smart Citations

Integrated High Temperature Coal-to-Hydrogen System with CO2 Separation

Ruud¹,

Ku²,

Ramaswamy³

et al. 2007

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Section: Materials Selectionmentioning

confidence: 99%

Section: Materials Selectionmentioning

confidence: 99%

Section: Synthesis Of Functionalized Mesoporous Membranesmentioning

confidence: 99%

Section: Synthesis Of Functionalized Mesoporous Membranesmentioning

confidence: 99%

See 2 more Smart Citations

Integrated High Temperature Coal-to-Hydrogen System with CO2 Separation

Ruud¹,

Ku²,

Ramaswamy³

et al. 2007

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“…Horiuchi et al 1 showed that basic metal oxides in alumina could enhance the selectivity of CO 2 . The addition of alkali metal oxides such as Cs 2 O and alkaline-earth oxides such as BaO were shown to increase the retention time for CO 2 than pure alumina.…”

Section: Executive Summarymentioning

confidence: 99%

Development of Mesoporous Membrane Materials for Co2 Separation

Shih¹,

Qiang²,

Wang³

2002

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Mesoporous and precipitated alumina were synthesized as the base material for CO 2 adsorbent. The porous alumina is doped with Ba to enhance its CO 2 affinity due to the basicity of Ba. It is shown by gas chromatograph (GC) that the addition of Ba enhances the separation CO 2 from N 2 . It was found that mesoporous alumina has larger specific surface area and better selectivity of CO 2 than precipitated alumina. Ba improves the affinity of mesoporous alumina with CO 2 . Phase may play an important role in selective adsorption of CO 2 . It is speculated that mesoporous alumina is more reactive than precipitated alumina creating the xBaO·Al 2 O3 phase that may be more affinitive to CO 2 than N 2 . On the other hand, the barium alumnate phase (Ba 3 Al 2 O 6 ) in the mesoporous sample does not help the adsorption of CO 2 .

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