Sulfonated hollow sphere carbon (HSC-SO3H) was synthesized from carbonization of a SiO2–polymer core–shell structure, followed by removal of the SiO2 core and sulfonation with chlorosulfonic acid. HSC-SO3H shows superior performances in acetalisation of glycerol, which is related to the hollow sphere carbon shell with rich microporosity for good mass transfer in the reaction.
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Wang et al. (2013) studied this question.
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