Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide We explore the separation of H 2 from CH 4 using ultrathin DDR membranes across various temperatures and feed pressures. Using a membrane that featured a zeolite film around 700 nm thick, we measured an H 2 permeance of 7.2 × 10 –7 mol/(m 2 ·s·Pa), equivalent to 2.2 × 10 3 GPU, for a 1/1 H 2 /CH 4 gas mixture at 3 bar(a) under ambient temperature. This permeance exceeds previously reported values for DDR membranes by more than 10-fold and is comparable to the permeance reported for the best palladium membranes. Under the same conditions, H 2 /CH 4 separation selectivity reached 207, well above values earlier reported for DDR membranes. These membranes also demonstrate outstanding performance under high pressures and temperatures of up to 180 °C, and high feed pressure is needed for achieving high H 2 /CH 4 selectivities at elevated temperatures. Interestingly, the experimental data fit a mass-transfer model that incorporates surface diffusion and surface barriers, indicating that the selective surface barrier governs the overall selective transport; meanwhile, the important parameters related to the mass transfer of H 2 and CH 4 in DDR zeolite are explored.
Source: Energy & Fuels
Institution: Luleå University of Technology
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
Funder: Vetenskapsrådet
OpenAlex ID: W4414788779