Characteristics and desulfurization-regeneration properties of sol-gel-derived copper oxide on alumina sorbents

Genoveva Buelna, Y. S. Lin

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Mesoporous alumina supported copper oxide granular sorbents were synthesized by the sol-gel method using different raw materials. The copper loading in the sorbents was varied from 5 to 20-wt.% CuO. The effect of the copper content on the surface area of the sorbents and dispersion of the active species was studied. Samples with <14 wt.% CuO did not show any crystalline copper containing phase. For CuO/γ-Al2O3 with 8 wt.% CuO, most of the copper species consisted of Cu2+ ions and no sulfide species were found. The optimum temperature for operation of the sol-gel derived sorbents was 400°C at which more than 85% of the initial sulfation capacity is maintained up to three sulfation-regeneration cycles. The pore structure, crush strength, sulfation capacity and regeneration properties of the sol-gel derived sorbents were studied and compared with those of the similar commercial sorbents used in pilot scale fluidized-bed copper oxide process for flue gas treatment. The sol-gel-derived mesoporous copper oxide coated alumina granules, with a surface area of 220-248 m2/g, pore volume of 0.46-0.48 cm3/g, and pore diameter of 6.7-8.8 nm, offer higher surface area, more uniform pore size distribution, and higher crush strength than the commercially available sorbents for the copper oxide process. For similar copper oxide content the sol-gel derived sorbents showed superior sulfation and regeneration properties than the commercial sorbents, in terms of sulfation capacity, regenerability, and SO2 concentration in the regenerated effluent.

Original languageEnglish (US)
Pages (from-to)167-179
Number of pages13
JournalSeparation and Purification Technology
Volume39
Issue number3
DOIs
StatePublished - Nov 2004
Externally publishedYes

Fingerprint

Copper oxides
Aluminum Oxide
Desulfurization
Sorbents
Sol-gels
Alumina
Copper
Effluent treatment
Sulfides
Pore structure
Fluidized beds
Sol-gel process
Pore size
Effluents
Raw materials
Ions
Crystalline materials

Keywords

  • γ-AlO
  • CuO
  • FGD
  • Monolayer capacity
  • Regeneration
  • Sol-gel
  • Sorbents
  • Sulfation

ASJC Scopus subject areas

  • Filtration and Separation

Cite this

Characteristics and desulfurization-regeneration properties of sol-gel-derived copper oxide on alumina sorbents. / Buelna, Genoveva; Lin, Y. S.

In: Separation and Purification Technology, Vol. 39, No. 3, 11.2004, p. 167-179.

Research output: Contribution to journalArticle

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abstract = "Mesoporous alumina supported copper oxide granular sorbents were synthesized by the sol-gel method using different raw materials. The copper loading in the sorbents was varied from 5 to 20-wt.{\%} CuO. The effect of the copper content on the surface area of the sorbents and dispersion of the active species was studied. Samples with <14 wt.{\%} CuO did not show any crystalline copper containing phase. For CuO/γ-Al2O3 with 8 wt.{\%} CuO, most of the copper species consisted of Cu2+ ions and no sulfide species were found. The optimum temperature for operation of the sol-gel derived sorbents was 400°C at which more than 85{\%} of the initial sulfation capacity is maintained up to three sulfation-regeneration cycles. The pore structure, crush strength, sulfation capacity and regeneration properties of the sol-gel derived sorbents were studied and compared with those of the similar commercial sorbents used in pilot scale fluidized-bed copper oxide process for flue gas treatment. The sol-gel-derived mesoporous copper oxide coated alumina granules, with a surface area of 220-248 m2/g, pore volume of 0.46-0.48 cm3/g, and pore diameter of 6.7-8.8 nm, offer higher surface area, more uniform pore size distribution, and higher crush strength than the commercially available sorbents for the copper oxide process. For similar copper oxide content the sol-gel derived sorbents showed superior sulfation and regeneration properties than the commercial sorbents, in terms of sulfation capacity, regenerability, and SO2 concentration in the regenerated effluent.",
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KW - γ-AlO

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