Table 1.
The composition of several components in biogas production [2].
Fig 1.
H2S adsorption system used in this study.
(a) Schematic diagram. (b) Actual photo.
Fig 2.
SEM micrograph images of the adsorbent samples at 2.5 k X (10 μm).
(a) Raw CAC. (b) KOH–CAC. (c) KI–CAC. (d) CuSO4–CAC. (e) Na2CO3–CAC. (f) ZnAc2–CAC.
Table 2.
Contents of elements (C, O, S, Zn, I, Ca, Na and K) in the fresh adsorbent.
Table 3.
Porous properties for fresh adsorbents sample from BET analysis.
Fig 3.
X-ray diffraction (XRD) patterns.
Table 4.
Percentage crystallinity and amorphousness of adsorbents.
Fig 4.
(a) Raw CAC (b) ZnAc2–CAC (c) Na2CO3–CAC (d) CuSO4–CAC (e) KOH–CAC (f) KI-CAC.
Table 5.
Surface functional groups.
Fig 5.
TGA curve for different adsorbent types.
Table 6.
Adsorbent weight loss at different temperature ranges.
Fig 6.
The breakthrough curve on the effect of feed flow rate using raw CAC with H2S/N2 feed.
Fig 7.
The breakthrough curve on the effect of L/D ratio for raw CAC as an adsorbent with H2S/N2 feed.
Table 7.
H2S adsorption performance at difference lengths of bed used.
Fig 8.
Comparison of adsorption capacity between H2S/N2 and H2S/N2/CO2 gas composition with their deficiency.
Fig 9.
Adsorption-desorption cycle profile for H2S removal using ZnAc2-CAC.
Table 8.
Regeneration performance ZnAc2-CAC.
Fig 10.
SEM micrograph image of the adsorbents at 2.5 k X (10 μm) (a) ZnAc2–CAC_A; (b) ZnAc2–CAC_D.
Table 9.
Contents of elements in the regeneration of ZnAc2–CAC sample.
Table 10.
Porous properties for regeneration of ZnAc2–CAC sample from BET analysis.
Fig 11.
Thermal profile for regeneration of ZnAc2–CAC sample.