Surface roughness improvement of Hastelloy X tubular filters for H2 selective supported Pd–Ag alloy membranes preparation

Thin Pd–Ag layers have been successfully deposited on ceramic supports with controlled surface characteristics. The need for less fragile membranes and ease of sealing connection leads to the study metallic thin Pd-based membrane development. Metallic supported are prone intermetallic diffusion issues so an interdiffusion barrier must be introduced. However, sufficient quality direct deposition expensive not readily available in market. It is thus important how improve roughness commercially rough filters, order allow a smooth, delamination-free layer. This work reports first attempt towards standardized preparation procedure cheap, rough, unrefined Hastelloy X tubular filters. focus reduction, uniform selective tubes tuned via 1) polishing 2) addition smoothening layer based boehmite dip-coated dispersion. time was assessed by studying average support's variation, permeation behavior ability retain coating. found that best trade-off between extent gas permeance support amounts 6 h. Moreover, it increasing load precursor solution thicker larger but greater instability. 1,2%wt proved reproducibility coverage. Different dipping-sintering routes were evaluated surface's suitability electroless plating: single route most suitable deposition. plating performed onto treated results continuous layer, proving possible selected