(DE4495604-T)      Membrane (I) which removes impurities from gases has a carbon layer(s) deposited on a porous metal substrate (II) where the layer is modified to present active sites which include at least partially deoxygenated metal species chemically bonded to the carbon layer. (I) is mfd. by depositing the carbon layer onto (II) then depositing a precursor metal species onto this layer and heating to form the active sites. Gas streams are purified by flowing the gas through (I) then stopping the flow and heating (I) above 300C in a redn. atmos. to regenerate the active sites followed by restarting the gas flow.    USE -   (I) removes O2, H2O, CO, CO2 or CH4 etc. from e.g. inert gases or trace contaminants in exhaust gases obtd. during electronic mfg. processes e.g. trace silanes, As, Hg, cyanide etc. or to remove moisture from reactive gases.    ADVANTAGE -   Contamination of gas stream and clogging of membrane pores is avoided. Carbon gives a more uniform layer on (II) than on ceramics. Wide choice of membrane geometry is available.    (JP9503428-W)      Membrane (I) which removes impurities from gases has a carbon layer(s) deposited on a porous metal substrate (II) where the layer is modified to present active sites which include at least partially deoxygenated metal species chemically bonded to the carbon layer. (I) is mfd. by depositing the carbon layer onto (II) then depositing a precursor metal species onto this layer and heating to form the active sites. Gas streams are purified by flowing the gas through (I) then stopping the flow and heating (I) above 300C in a redn. atmos. to regenerate the active sites followed by restarting the gas flow.    USE -   (I) removes O2, H2O, CO, CO2 or CH4 etc. from e.g. inert gases or trace contaminants in exhaust gases obtd. during electronic mfg. processes e.g. trace silanes, As, Hg, cyanide etc. or to remove moisture from reactive gases.    ADVANTAGE -   Contamination of gas stream and clogging of membrane pores is avoided. Carbon gives a more uniform layer on (II) than on ceramics. Wide choice of membrane geometry is available.    (GB2296492-B)      Membrane (I) which removes impurities from gases has a carbon layer(s) deposited on a porous metal substrate (II) where the layer is modified to present active sites which include at least partially deoxygenated metal species chemically bonded to the carbon layer. (I) is mfd. by depositing the carbon layer onto (II) then depositing a precursor metal species onto this layer and heating to form the active sites. Gas streams are purified by flowing the gas through (I) then stopping the flow and heating (I) above 300C in a redn. atmos. to regenerate the active sites followed by restarting the gas flow.    USE -   (I) removes O2, H2O, CO, CO2 or CH4 etc. from e.g. inert gases or trace contaminants in exhaust gases obtd. during electronic mfg. processes e.g. trace silanes, As, Hg, cyanide etc. or to remove moisture from reactive gases.    ADVANTAGE -   Contamination of gas stream and clogging of membrane pores is avoided. Carbon gives a more uniform layer on (II) than on ceramics. Wide choice of membrane geometry is available.    (EP711202-B1)      Membrane (I) which removes impurities from gases has a carbon layer(s) deposited on a porous metal substrate (II) where the layer is modified to present active sites which include at least partially deoxygenated metal species chemically bonded to the carbon layer. (I) is mfd. by depositing the carbon layer onto (II) then depositing a precursor metal species onto this layer and heating to form the active sites. Gas streams are purified by flowing the gas through (I) then stopping the flow and heating (I) above 300C in a redn. atmos. to regenerate the active sites followed by restarting the gas flow.    USE -   (I) removes O2, H2O, CO, CO2 or CH4 etc. from e.g. inert gases or trace contaminants in exhaust gases obtd. during electronic mfg. processes e.g. trace silanes, As, Hg, cyanide etc. or to remove moisture from reactive gases.    ADVANTAGE -   Contamination of gas stream and clogging of membrane pores is avoided. Carbon gives a more uniform layer on (II) than on ceramics. Wide choice of membrane geometry is available.