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(a) Nitrogen adsorption isotherms of SBA-15 and 5 wt% (Fe, Co, Ni)-SBA-15. (b) Nitrogen adsorption isotherms of 2–8 wt% of Fe-SBA-15. (c) Nitrogen adsorption isotherms of 2–8 wt% of Co-SBA-15. (d) Nitrogen adsorption isotherms of 2–8 wt% of Ni-SBA-15.
