Preparation method of palladium-base composite membrane
A composite membrane, palladium-based technology, applied in the field of preparation of composite membrane materials, can solve the problems of low hydrogen permeability, high preparation difficulty and poor selectivity of composite membranes, and achieve the effect of reducing the difficulty of modification, simple operation and high success rate
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Embodiment 1
[0030] A preparation method of a high hydrogen permeability palladium-based composite membrane, the steps are as follows:
[0031] (1) Using tubular porous ceramics as the carrier material, the outer diameter is 12 mm, the inner diameter is 8 mm, the length is 75 mm, and the pore diameter is 0.5-3 μm, which is washed and dried for later use. SEM of porous ceramic supports such as figure 1 As shown, the surface is rough and the pore size is large.
[0032] (2) Preparation of polyvinyl alcohol-TiO 2 Water-based suspension, using water as a medium, dissolves or disperses the above-mentioned organic and inorganic substances to obtain a suspension, and the mass ratio of the two is 1:8. The obtained suspension was coated on the surface of the porous ceramic support by dipping method and dried at room temperature. The dip coating-drying operation was repeated until an organic-inorganic hybrid layer of about 10 μm thick was formed.
[0033] (3) Carry out heat treatment on the coat...
Embodiment 2
[0038] A preparation method of a high hydrogen permeability palladium-based composite membrane, the steps are as follows:
[0039] (1) A tubular porous ceramic / stainless steel material is used as a carrier, with an outer diameter of 12 mm, an inner diameter of 8 mm, a length of 75 mm, and a pore diameter of 2.0-5.0 μm, which is cleaned and dried for later use.
[0040] (2) Preparation of polyvinylpyrrolidone-Al 2 o 3 Aqueous suspension, using water as a medium, dissolve or disperse the above-mentioned organic and inorganic substances to obtain a suspension, in which polyvinylpyrrolidone-Al 2 o 3 The mass ratio is 1:6. The obtained suspension was coated on the surface of porous ceramic / stainless steel support by dipping method and dried at room temperature. The dip coating-drying operation was repeated until an organic-inorganic hybrid layer of about 5 μm thick was formed.
[0041] (3) Carry out heat treatment to the carrier after coating, treatment atmosphere is N 2 gas,...
Embodiment 3
[0046] A preparation method of a high hydrogen permeability palladium-based composite membrane, the steps are as follows:
[0047] (1) Using tubular porous stainless steel as the carrier, the outer diameter is 12 mm, the inner diameter is 8 mm, the length is 75 mm, and the carrier pore diameter is 1.0-3.5 μm.
[0048] (2) Preparation of polyvinyl alcohol-SiO 2 Water-based suspension, using water as the medium, dissolve or disperse the above-mentioned organic and inorganic substances to obtain a suspension, in which polyvinyl alcohol-SiO 2 The mass ratio is 1:6. The resulting suspension was coated on the surface of a porous stainless steel support by spin coating and dried at room temperature. The dip coating-drying operation was repeated until an organic-inorganic hybrid layer of about 15 μm thick was formed.
[0049] (3) Carry out heat treatment on the coated carrier, the treatment atmosphere is argon, the temperature is 700°C, and the time is 3h to obtain carbon-doped SiO...
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