Due to its sulfonic acid groups, sulfonated poly (ether ether) ketone (sPEEK) can be applied as a polymeric solid-acid catalyst. SPEEK spheres were synthesized with an ion exchange capacity of 0.8 meq/g to 1.8 meq/g, and their activity and stability were tested. In converting methanol to dimethyl ether, sPEEK-25 has its highest activity at 170 °C. In the oleic acid and 1-decanol reaction at 170 °C, sPEEK-49 showed the highest activity compared to all tested commercial catalysts. SPEEK-24 had the highest activity at 150 °C for synthesizing octyl levulinate, compared to Amberlyst™ 36 and Lewatit® K2420. SPEEK remains stable during both reactions.
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Greve et al. (2024) studied this question.
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