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Title: Apparatus and method for simultaneous recovery of hydrogen from water and from hydrocarbons

Abstract

Apparatus and method for simultaneous recovery of hydrogen from water and from hydrocarbon feed material. The feed material is caused to flow over a heated catalyst which fosters the water-gas shift reaction (H.sub.2 O+COH.sub.2 +CO.sub.2) and the methane steam reforming reaction (CH.sub.4 +H.sub.2 O3 H.sub.2 +CO). Both of these reactions proceed only to partial completion. However, by use of a Pd/Ag membrane which is exclusively permeable to hydrogen isotopes in the vicinity of the above reactions and by maintaining a vacuum on the permeate side of the membrane, product hydrogen isotopes are removed and the reactions are caused to proceed further toward completion. A two-stage palladium membrane reactor was tested with a feed composition of 28% CQ.sub.4, 35% Q.sub.2 O (where Q=H, D, or T), and 31% Ar in 31 hours of continuous operation during which 4.5 g of tritium were processed. Decontamination factors were found to increase with decreasing inlet rate. The first stage was observed to have a decontamination factor of approximately 200, while the second stage had a decontamination factor of 2.9.times.10.sup.6. The overall decontamination factor was 5.8.times.10.sup.8. When a Pt/.alpha.-Al.sub.2 O.sub.3 catalyst is employed, decoking could be performed without catalyst degradation. However, by adjusting the carbonmore » to oxygen ratio of the feed material with the addition of oxygen, coking could be altogether avoided.« less

Inventors:
 [1];  [1]
  1. Los Alamos, NM
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
OSTI Identifier:
873463
Patent Number(s):
US 6165438
Assignee:
Regents of University of California (Los Alamos, NM)
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
apparatus; method; simultaneous; recovery; hydrogen; water; hydrocarbons; hydrocarbon; feed; material; caused; flow; heated; catalyst; fosters; water-gas; shift; reaction; coh; methane; steam; reforming; o3; reactions; proceed; partial; completion; pd; membrane; exclusively; permeable; isotopes; vicinity; maintaining; vacuum; permeate; product; removed; two-stage; palladium; reactor; tested; composition; 28; cq; 35; 31; hours; continuous; operation; tritium; processed; decontamination; factors; found; increase; decreasing; inlet; rate; stage; observed; factor; approximately; 200; times; 10; overall; alpha; -al; employed; decoking; performed; degradation; adjusting; carbon; oxygen; ratio; addition; coking; altogether; avoided; membrane reactor; simultaneous recovery; decontamination factor; hydrogen isotope; continuous operation; feed material; steam reforming; hydrogen isotopes; shift reaction; reforming reaction; oxygen ratio; hydrocarbon feed; gas shift; overall decontamination; palladium membrane; /423/95/422/

Citation Formats

Willms, R Scott, and Birdsell, Stephen A. Apparatus and method for simultaneous recovery of hydrogen from water and from hydrocarbons. United States: N. p., 2000. Web.
Willms, R Scott, & Birdsell, Stephen A. Apparatus and method for simultaneous recovery of hydrogen from water and from hydrocarbons. United States.
Willms, R Scott, and Birdsell, Stephen A. Sat . "Apparatus and method for simultaneous recovery of hydrogen from water and from hydrocarbons". United States. https://www.osti.gov/servlets/purl/873463.
@article{osti_873463,
title = {Apparatus and method for simultaneous recovery of hydrogen from water and from hydrocarbons},
author = {Willms, R Scott and Birdsell, Stephen A},
abstractNote = {Apparatus and method for simultaneous recovery of hydrogen from water and from hydrocarbon feed material. The feed material is caused to flow over a heated catalyst which fosters the water-gas shift reaction (H.sub.2 O+COH.sub.2 +CO.sub.2) and the methane steam reforming reaction (CH.sub.4 +H.sub.2 O3 H.sub.2 +CO). Both of these reactions proceed only to partial completion. However, by use of a Pd/Ag membrane which is exclusively permeable to hydrogen isotopes in the vicinity of the above reactions and by maintaining a vacuum on the permeate side of the membrane, product hydrogen isotopes are removed and the reactions are caused to proceed further toward completion. A two-stage palladium membrane reactor was tested with a feed composition of 28% CQ.sub.4, 35% Q.sub.2 O (where Q=H, D, or T), and 31% Ar in 31 hours of continuous operation during which 4.5 g of tritium were processed. Decontamination factors were found to increase with decreasing inlet rate. The first stage was observed to have a decontamination factor of approximately 200, while the second stage had a decontamination factor of 2.9.times.10.sup.6. The overall decontamination factor was 5.8.times.10.sup.8. When a Pt/.alpha.-Al.sub.2 O.sub.3 catalyst is employed, decoking could be performed without catalyst degradation. However, by adjusting the carbon to oxygen ratio of the feed material with the addition of oxygen, coking could be altogether avoided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {1}
}

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