raw · papers · ingested 2026-06-26
Sorption rate enhancement in SAPO-34 zeolite by directed mass-transfer channels (Ammann et al.)
Source: https://www.sciencedirect.com/science/article/abs/pii/S0017931018332198
Source: Int. J. Heat and Mass Transfer, 2019. Publisher full-text blocked; numbers from search snippets — verify before verbatim citation. Credibility: High (peer-reviewed, experimental). Confidence: medium-high (snippet-level numbers).
Key findings
- Introduced uniformly spaced 75 µm longitudinal channels into SAPO-34 coatings → anisotropic hierarchical structure (adsorbent interspaced with open transport channels).
- 2× water sorption rate and +100% per-cycle power-energy product at the same adsorbent mass per unit area — no added equilibrium capacity/surface area; the gain is purely transport.
- Water adsorption in SAPO-34 coatings is explicitly “limited by mass transfer.” Optimal ratio of characteristic transport length for heat vs mass ≈ 6.
- Companion coated-HX data: ~90 kW/m³ volumetric SCP (coated) vs ~59 kW/m³ (pellet-packed), same zeolite.
Relevance
The keystone supporting source for fractal-hierarchical-bed-geometry: geometry that eases transport — not surface area — doubles power at fixed capacity.