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Template Removal from SBA-15 by Ionic Liquid for Amine Grafting: Applications to CO2 Capture and Natural Gas Desulfurization
journal contribution
posted on 2020-05-22, 14:12 authored by Yiren Wang, Ralph T. YangA new ionic liquid treatment method
has been developed for removing
the organic template from mesoporous silica SBA-15. Compared with
conventional template removal by air calcination, the novel ionic
liquid treatment method efficiently removed the organic template at
a low temperature and preserved the surface silanol groups. The significantly
increased silanol density led to higher amine loadings on amine grafted
SBA-15. Consequently, the ionic liquid treated sample showed 63% more
CO2 capacity at conditions relevant to CO2 capture
from flue gas. Moreover, the ionic liquid treated sample exhibited
significantly higher capacities for H2S capture from natural
gas as well as CO2 adsorption capacities for direct air
capture which were nearly 3 times higher than the conventionally treated
sample. The adsorbent stability, the isosteric heats of adsorption,
and the effect of moisture were also investigated for the ionic liquid
treated sample. The mechanism of template removal by ionic liquid
is discussed, and the feasibility of recovery/reuse of the ionic liquid
and the template is shown.