In this project, heterogeneously catalyzed continuous flow processes for Diels-Alder reactions will be studied. The use in industry of Diels-Alder reactions is being limited due to safety concerns regarding upscaling. In the beginning, a generic reaction will be optimized. Next, various industrial relevant Diels-Alder reactions will be studied. Zeolites and functionalized mesoporous silica will be evaluated as solid acid catalysts.