explores recent developments and future perspectives in the area of membrane reactor (MR) systems. It includes fundamental principles, the different types of membrane materials (such as polymeric and inorganic), the different types of membrane reactors (such as Micro MRs, Enzymatic MRS, Photo-catalytic MRs, Pervaporation MRs, Electrochemical MRs, etc.), their industrial perspective and, finally, there also is an economic evaluation of the metallic MRs. The book provides an extensive review in the area of MRs for each kind of application present in the specialized literature and discusses their modelling and design approaches necessary for MR systems validation in achieving high conversions, energy savings, high yields and high hydrogen (or others) products of the reactions studied.