Preparation and characterisation of palladium-loaded polypropylene porous hollow fibre membranes for hydrogenation of dissolved oxygen in water

Adlayers of palladium particles and their aggregates on porous polypropylene hollow fiber membranes as hydrogenization contractors/reactors

“…Follow-up studies on the development of polymeric catalytic membranes were performed in the two following directions: (i) dense catalytic membranes [9][10][11][12][13][14][15][16][17][18] and (ii) porous catalytic membranes for both gas phase hydrogenation [19][20][21][22][23][24] and liquid phase hydrogenation [25][26][27][28][29][30][31][32][33][34][35].…”

“…Noteworthy is that the correct design of porous polymeric catalytic membrane makes it possible to achieve both flow-through [25][26][27][28][29], and interfacial [30][31][32][33][34][35] contactor modes. This study is devoted to the further development of research activities on the preparation of CMRs, namely, contactors of interfacial mode for the removal of dissolved oxygen (DO) from water.…”

“…Then, their outer surface was etched either by strong inorganic acids or by strong inorganic bases. In the next step, one of the two methods of electroless deposition of Pd was used: (i) reduction of palladium tetraaminochloride by hydrazine hydrate (initial membranes were Accurel Q3/2 and Accurel S6/2) [32,34,35]) and (ii) reduction of palladium chloride or palladium acetate by aliphatic alcohol (Accurel Q3/2 [32,34], Celgard X50 [33,35]). Fig.…”

“…At the present time, both dimensions [41] and shape [42] of catalytic particles can be controlled. The most traditional methods for the characterization of Pd nanoparticles in polymeric catalytic membranes are the methods of X-ray diffraction (XRD) and electron spectroscopy [11,12,14,34,43,44]. For crystalline nanoparticles, the average dimensions L can be estimated by the XRD [45].…”

Removal of dissolved oxygen from water using a Pd-resin based catalytic reactor

“…They are undesirable because of the toxicity of the hydrazine material and also because of the increase of solid contents in water due to the addition of sodium sulfite. Reaction with a reducing agent such as hydrogen in the presence of a catalyst [8,9], Catalytic polymeric membranes [10,11] or UV light [12,13] to form water is an attractive method as it produces no by-product to contaminate the produced water.…”