Membrane-based gas separation

Membranes for gas separation

This review highlights various aspects of current palladium membrane research and serves as a comprehensive bibliography covering palladium membrane preparation methods and applications. There are many promising uses for palladium membranes, although widespread use of the available technologies is constrained primarily by the high cost of palladium, lack of durability due to hydrogen embrittlement, and susceptibility to fouling. Various researchers in the field are tackling these problems and fabricating thinner palladium alloy composite membranes that better withstand contaminantion and thermal cycling. What has been accomplished to address these issues and the directions presently being explored are discussed.

Innovations in palladium membrane research

Inorganic membranes for hydrogen production and purification: A critical review and perspective

Recent advances in aerosol and combustion science and engineering now allow scalable flame synthesis of mixed oxides, metal salts and even pure metals in the form of nanoparticles and films with closely controlled characteristics. In this way, high purity materials with novel metastable phases are made that are not accessible by conventional wet-phase and solid state processes. Here, flame processes are classified into vapour-fed and liquid-fed ones depending on the employed state of the metal precursor. Liquid-fed flame processes are distinguished for their flexibility in producing materials of various compositions and morphologies that result in unique product functionalities. Parameters controlling the characteristics of flame-made particles and films are summarized and selected classes of materials are reviewed focusing on catalysts, sensors, biomaterials (orthopaedic, dental or nutritional), electroceramics (fuel cells, batteries) and phosphors exhibiting superior performance over conventionally made ones. Just a few years ago it seemed impossible to make these materials in the gas phase. Finally, health effects of such particles are discussed while future challenges and opportunities for flame-made materials are highlighted.

Flame aerosol synthesis of smart nanostructured materials

Preparation of palladium-silver alloy membranes for hydrogen separation by the spray pyrolysis method

We prepared a γ-alumina thin membrane with nanometer pores by sol-gel method on the inner surface of an α-alumina hollow fiber and applied it to a catalytic reactor system for dehydrogenation of cyclohexane

Equilibrium shift of dehydrogenation at short space-time with hollow fiber ceramic membrane

Preparation of a sol-gel derived thin membrane on a porous ceramic hollow fiber by the filtration technique

A hydrogen separation membrane having a good hydrogen selective permeance and a high stability, without any deterioration, even if exposed to a high temperature atmosphere or steam, which comprises a porous ceramic membrane with SiO2 deposited and filled into pores on the surface of the membrane and a SiO2 thin film formed on the surface of the membrane as a hydrogen selectively permeable film is produced by introducing a vaporized SiO2 source into pores on the surface of a porous ceramic membrane by suction established by providing a pressure difference between both sides of the membrane and thermally decomposing the SiO2 source, thereby forming, depositing and filling SiO2 into the pores and fully coating the outer surface of the membrane with a SiO2 thin film simultaneously where the SiO2 source is preferably a tetra(lower alkoxy)silane and the deposition of the SiO2 source is preferably carried out by a chemical vapor deposition process

Hydrogen separation membrane and process for producing the same

H2 sepn. membrane comprises a porous ceramic membrane, which has pores filled with SiO2 and is completely coated with a thin SiO2 film. Also claimed are methods of making the membrane.

Shigeo Akiyama

Papers

Preparation of palladium-silver alloy membranes for hydrogen separation by the spray pyrolysis method

Equilibrium shift of dehydrogenation at short space-time with hollow fiber ceramic membrane

Preparation of a sol-gel derived thin membrane on a porous ceramic hollow fiber by the filtration technique

Hydrogen separation membrane and process for producing the same

Hydrogen@ sepn. membrane with good selective permeability and stability