“…Until now, available process studies give little or insufficient emphasis on the transition from ortho-to para-hydrogen and the accompanied heat release. Existing studies use staged isothermal conversion [16,17], rely on equilibrium ortho-para conversion without a kinetic model [18], or apply simplified, empirical kinetic models [12,19,20]. In this study, the obtained kinetics are implemented in a one-dimensional pseudo-homogeneous heat exchanger model, which is capable to describe the heat, mass, and momentum transport inside a packed-bed heat exchanger together with the catalytic conversion of orthohydrogen.…”