%0 Journal Article
%A Wang, Jian
%A Yang, Chao
%A Zhao, Ying-Rui
%A Fan, Hui-Ling
%A Wang, Zhong-De
%A Shangguan, Ju
%A Mi, Jie
%D 2017
%T Synthesis of Porous Cobalt Oxide and Its Performance
for H2S Removal at Room Temperature
%U https://acs.figshare.com/articles/journal_contribution/Synthesis_of_Porous_Cobalt_Oxide_and_Its_Performance_for_H_sub_2_sub_S_Removal_at_Room_Temperature/5532274
%R 10.1021/acs.iecr.7b02934.s001
%2 https://acs.figshare.com/ndownloader/files/9579412
%K surface area
%K 3 D-SCN 57-500
%K crystal template method
%K sol precursors
%K H 2 S Removal
%K Co 3 O 4
%K ethylene glycol
%K breakthrough H 2 S capacity
%K adsorption experiments show
%K breakthrough sulfur capacity
%K 3 D-SCE 57-500
%K H 2 S
%K 3 DOM samples
%K H 2 S removal
%K 3 DOM structure
%K Co 3 O 4 utilization
%K adsorbent
%K butyl alcohol
%K Porous Cobalt Oxide
%X Two types of cobalt oxide–silica
composites were prepared
by sol–gel method using different alcohols (n-butyl alcohol and ethylene glycol) in sol precursors. The corresponding
adsorbents with 3DOM structure were also fabricated via a colloidal
crystal template method. Physicochemical properties of the materials
were characterized by means of numerous techniques, and the performance
for hydrogen sulfide (H2S) removal were evaluated at room
temperature. It was found that using n-butyl alcohol
in sol precursors could achieve a material (SCN57-500) with plentiful
ordered mesoporous in grains and thus had very large surface area
(314.5 m2/g), whereas the sample obtained from ethylene
glycol (SCE57-500) only possessed a smaller surface area. After introducing
3DOM structure into the bulk counterpart, the surface area improved
remarkably as in the case of 3D-SCE57-500, which is consistent with
our previous studies. However, 3D-SCN57-500 showed a decreased surface
area compared with SCN57-500. The loss of surface area was due to
the sharply decreased pores in grains, which is originated from sintering
when the hard template was burning out during the preparation process.
It can be deduced that the increased surface area after introducing
3DOM structure was ascribed to the excellent dispersion, i.e., the
newly formed very small nanoscale grains. The results of adsorption
experiments show that although SCN57-500 owned the highest surface
area among these four adsorbents, however, it exhibited a poorest
performance for H2S capture. Both 3DOM samples possessed
very favorable breakthrough H2S capacity compared to the
counterparts without 3DOM structure. The results indicated that size
of crystalline or dispersion and not the surface area is what contributes
to the reactivity of the adsorbent. The well-ordered and interconnected
macropores play an important role as well. The breakthrough sulfur
capacity of 3D-SCE57-500 could reach as high as 189 mg/g with Co3O4 utilization of 63%. The involved reactions for
H2S removal by Co3O4 in experimental
conditions were suggested.
%I ACS Publications