This book will focus on the microporous materials with their potential membrane applications. A variety of porous materials will be introduced in this book including microporous silica, porous carbons, zeolites, metal-organic frameworks (MOFs), and porous organic frameworks (POFs). This book will also cover broad topics of membrane separations, such as hydrogen recovery, carbon dioxide capture, air purification, hydrocarbon separation, pervaporation, and water treatment. Moreover, this book talks about the most recent materials for preparing microporous membranes, as well as highlights the most promising applications of industrial interest.