The alkyltrimethylammonium templates, cited in the original patent for the preparation of MCM-41, have been replaced by a novel set of templates, 1-alkyl-3-methylimidazolium salts. Systematic studies have revealed subtle differences in the performance of the novel templates, and identify them as viable reagents in the synthesis of good quality MCM-41.
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Adams et al. (2002) studied this question.