Separation of gas mixtures by supported complexes

Nelson, D A; Lilga, M A

doi:10.2172/7204413

Title: Separation of gas mixtures by supported complexes

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Abstract

A system was investigated that catalyzes the dehydrogenation of alcohols and the hydrogenation of ketones. Such a catalyst, if used in a membrane containing an alcohol solvent, might be of use in selective H/sub 2/ separation from gas mixtures. The dehydrogenation of cyclohexanol and 2-octanol were studied using a RhCl/sub 3//SnCl/sub 2//LiCl catalyst system. These alcohols are dehydrogenated at rates that are initially rapid, but which gradually slow to a stop. The decrease in rate of H/sub 2/ evolution is a result of the establishment of an equilibrium between the alcohol and the liberated hydrogen and ketone. At 150/sup 0/C, cyclohexanol has the fastest rate of dehydrogenation. Several dehydrogenation/hydrogenation cycles have been carried out using this alcohol over a period of one week without serious catalyst deactivation or side reactions. Initial tests of the catalyst dissolved in cyclohexanol within two membranes were inconclusive. An anion exchange membrane was not suitably wetted by the catalyst solution and Celgard/sup TM/, which was wetted, could not be kept wet at 150/sup 0/C under flow conditions in the membrane cell. 9 refs., 3 figs., 1 tab.

Authors:: Nelson, D A; Lilga, M A

Publication Date:: Mon Dec 01 00:00:00 EST 1986

Research Org.:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

OSTI Identifier:: 7204413

Report Number(s):: PNL-5733
ON: DE87003963

DOE Contract Number:: AC06-76RL01830

Resource Type:: Technical Report

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; GASES; SEPARATION PROCESSES; HYDROGEN; RHODIUM CHLORIDES; CATALYTIC EFFECTS; RUTHENIUM COMPLEXES; SORPTIVE PROPERTIES; ALCOHOLS; CARBON MONOXIDE; CATALYSTS; DEHYDROGENATION; HYDROGENATION; KETONES; MEMBRANES; SPECIFICITY; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMICAL REACTIONS; CHLORIDES; CHLORINE COMPOUNDS; COMPLEXES; ELEMENTS; FLUIDS; HALIDES; HALOGEN COMPOUNDS; HYDROXY COMPOUNDS; NONMETALS; ORGANIC COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; REFRACTORY METAL COMPOUNDS; RHODIUM COMPOUNDS; SURFACE PROPERTIES; TRANSITION ELEMENT COMPLEXES; TRANSITION ELEMENT COMPOUNDS; 400105* - Separation Procedures

Citation Formats


                    Nelson, D A, and Lilga, M A. Separation of gas mixtures by supported complexes.  United States: N. p., 1986. 
        Web.  doi:10.2172/7204413.

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                    Nelson, D A, & Lilga, M A. Separation of gas mixtures by supported complexes.  United States.  https://doi.org/10.2172/7204413

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                    Nelson, D A, and Lilga, M A. 1986.  
        "Separation of gas mixtures by supported complexes".  United States.  https://doi.org/10.2172/7204413.  https://www.osti.gov/servlets/purl/7204413.

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@article{osti_7204413,

  title        = {Separation of gas mixtures by supported complexes},

  author       = {Nelson, D A and Lilga, M A},

  abstractNote = {A system was investigated that catalyzes the dehydrogenation of alcohols and the hydrogenation of ketones. Such a catalyst, if used in a membrane containing an alcohol solvent, might be of use in selective H/sub 2/ separation from gas mixtures. The dehydrogenation of cyclohexanol and 2-octanol were studied using a RhCl/sub 3//SnCl/sub 2//LiCl catalyst system. These alcohols are dehydrogenated at rates that are initially rapid, but which gradually slow to a stop. The decrease in rate of H/sub 2/ evolution is a result of the establishment of an equilibrium between the alcohol and the liberated hydrogen and ketone. At 150/sup 0/C, cyclohexanol has the fastest rate of dehydrogenation. Several dehydrogenation/hydrogenation cycles have been carried out using this alcohol over a period of one week without serious catalyst deactivation or side reactions. Initial tests of the catalyst dissolved in cyclohexanol within two membranes were inconclusive. An anion exchange membrane was not suitably wetted by the catalyst solution and Celgard/sup TM/, which was wetted, could not be kept wet at 150/sup 0/C under flow conditions in the membrane cell. 9 refs., 3 figs., 1 tab.},

  doi          = {10.2172/7204413},

  url          = {https://www.osti.gov/biblio/7204413},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Mon Dec 01 00:00:00 EST 1986},

  month        = {Mon Dec 01 00:00:00 EST 1986}

}

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