Hydrogen membranes

Reflux overhead vapor recompression, staged crude pre-heat, mechanical vacuum pumps Fluid coking to gasification, turbine power recovery train at the FCC, hydraulic turbine power recovery, membrane hydrogen purification, unit to hydrocracker recycle loop Improved catalysts (reforming), and hydraulic turbine power recovery Process management and integration... 

The situation changed drastically in the mid-1990s in view of the considerable advances made in the development of membrane hydrogen-oxygen (air) fuel cells, which could be put to good use for other types of fuel cells. At present, most work in methanol fuel cells utilizes the design and technical principles known from the membrane fuel cells. Both fuel-cell types use Pt-Ru catalyst at the anode and pure platinum catalyst at the cathode. The membranes are of the same type. 

Avdeef, A., Tsinman, O. PAM PA -a drug absorption in vitro model 13. Chemical selectivity due to membrane hydrogen bonding in comho comparisons of HDM-, DOPC-, and DS-PAMPA models. Eur. J. Pharm. Set. 2006, 28, 43-50. 

Air Liquide, MEDAL Hydrogen Membrane, available at http //www.medal.airliquide.com/en/ membranes/hydrogen/index.asp (accessed July 2007). 

When it reaches the polymer membrane, hydrogen gas is oxidized at the negative side of the cell (drawn on the left of Figure 7.3), forming protons according to... 

Microcalorimetric combustion, dioxetane enthalpy of formation, 163 Microdialysis membrane, hydrogen peroxide determination, 651... 

NADPH (nicotinamide adenine dinucleotide phosphate), 610, 643, 659 Nation membrane, hydrogen peroxide... 

A diagram of the microbial sensor is illustrated in Figure 2. When the sensor was inserted into a sample solution containing formic acid, formic acid permeated through the porous Teflon membrane. Hydrogen, produced from formic acid by butyricum, penetrated through the Teflon membrane, and was oxidized on the platinum anode. As a result, the current increased until it reached a steady state. The steady state current depended on the concentration of formic acid. The steady state current was obtained within 20 min. 

There have been severe criticisms about the extended use of chlorine gas in industry, owing to concern primarily derived from its ability to form toxic chlorinated organic compounds. In order to avoid its co-production during the electrolytic production of sodium hydroxide, a process has been developed in which a sodium carbonate (soda ash) solution is used as the anolyte in an electrochemical reactor divided by an ion-exchange membrane. Hydrogen gas is produced at the cathode and sent to a gas diffusion anode. Assuming no by-products in the liquid phase and only one by-product in the gas phase ... 

T. Kameyama, K. Fukuda, M. Fujishige, H. Yokokawa and M. Dokiya, Production of Hydrogen from Hydrogen Sulfide by Means of Selective Diffusion Membranes , Hydrogen Energy Prog. Res., 2 569-79 (1981). 

Because hydrogen sulfide is a gas, it is not rejected by an RO membrane. For systems that do not remove the compound prior to the RO membranes, hydrogen sulfide will be present in the permeate. Exposure to air on the permeate side of the membrane, such... 

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