Design and operational considerations of packed-bed membrane reactor for distributed hydrogen production by methane steam reforming

Methane steam reforming will still account for most of hydrogen production in the coming decades. Membrane reactor can play a key role in both energy saving and process/equipment compactness, particularly for its decentralized applications. Here we design a particles-based packed-bed membrane reactor and explore the operational window and design challenges by conducting systematic study experimentally and computationally, particularly emphasizing geometrical scale of membrane reactor and catalyst activity. The results show that membrane reactor presents maximum hydrogen flux by consuming unit methane under the optimized operation conditions of GHSV (i.e., 1134 hr-1) and steam-tocarbon ratio (i.e., 2), and computational study shows that optimal operation window is around 30 atm and 773.15 K. Moreover, the design criteria of Catalyst activity - Membrane performance - Radial depth is revealed quantitatively and catalyst activity is identified as the key limiting factor for further process intensification. Briefly, these results shed some lights on operation, optimal design, and further improvement of membrane reactor in methane steam reforming.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

Methane steam reforming is expected to be the dominant method for hydrogen production in the future. The use of a membrane reactor can significantly save energy and achieve process and equipment compactness, especially for decentralized applications. This study focuses on the design of a particle-based packed-bed membrane reactor and investigates its operational window and design challenges through experimental and computational approaches, with a particular emphasis on the scale of the reactor and catalyst activity. The results reveal the optimal operation conditions for maximizing hydrogen flux and identify catalyst activity as the key limiting factor for further process intensification.