US2025236962A1PendingUtilityA1
Integrated hydrogen production method and system
Est. expiryJul 8, 2041(~15 yrs left)· nominal 20-yr term from priority
C25B 13/07C25B 9/23C25B 9/015C25B 1/042C25B 11/047C25B 11/042C25B 15/08C25B 11/031C25B 1/23C25B 1/50C25B 11/093C25B 11/091C25B 1/04C25B 1/02
72
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Claims
Abstract
Herein discussed is a hydrogen production system comprising a first reactor zone and a second reactor zone, wherein both reactor zones comprise an ionically conducting membrane, wherein the first zone is capable of reforming a hydrocarbon electrochemically and the second zone is capable of performing water gas shift reactions electrochemically, wherein the electrochemical reforming reactions involve the exchange of an ion through the membrane to oxidize the hydrocarbon and wherein electrochemical water gas shift reactions involve the exchange of an ion through the membrane and include forward water gas shift reactions, or reverse water gas shift reactions, or both. In an embodiment, the membrane is mixed conducting. In an embodiment, the membrane comprises an electronically conducting phase and an ionically conducting phase.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A method of producing hydrogen comprising:
a. providing a hydrogen production system comprising a first reactor zone and a second reactor zone, wherein both reactor zones comprise a mixed-conducting membrane, b. introducing a first stream comprising a hydrocarbon to the system, c. introducing a second stream comprising water to the system, and d. reducing the water in the second stream to produce hydrogen, wherein the first stream and the second stream do not come in contact with each other in the system, and wherein the hydrocarbon is reformed electrochemically in the first reactor zone.
2 . The method of claim 1 , wherein electrochemical water gas shift reactions take place in the second reactor zone.
3 . The method of claim 1 , wherein both reactor zones comprise an anode on the first stream side and a cathode on the second stream side, wherein the anode and the cathode are separated by the membrane and are in contact with the membrane respectively, and wherein the anode and the cathode are both exposed to a reducing environment.
4 . The method of claim 3 , wherein the anode and the cathode in the second reactor zone comprise Ni or NiO and a material selected from the group consisting of YSZ, 8YSZ, CGO, CoCGO, SDC, SSZ, LSGM, and combinations thereof.
5 . The method of claim 3 , wherein the cathode in the first reactor zone comprises Ni or NiO and a material selected from the group consisting of YSZ, 8YSZ, CGO, CoCGO, SDC, SSZ, LSGM, and combinations thereof, and wherein the anode comprises doped or undoped ceria and a material selected from the group consisting of Cu, CuO, Cu 2 O, Ag, Ag 2 O, Au, Au 2 O, Au 2 O 3 , Pt, Pd, Ru, Rh, Ir, LaCaCr, LaSrCrFe, YSZ, CGO, SDC, SSZ, LSGM, stainless steel, and combinations thereof.
6 . The method of claim 3 , wherein the cathode in the first reactor zone comprises Ni or NiO and a material selected from the group consisting of YSZ, 8YSZ, CGO, CoCGO, SDC, SSZ, LSGM, and combinations thereof, and wherein the anode comprises lanthanum chromite and a material selected from the group consisting of doped ceria, yttria-stabilized zirconia (YSZ), lanthanum strontium gallate magnesite (LSGM), scandia-stabilized zirconia (SSZ), Sc and Ce doped zirconia, and combinations thereof.
7 . The method of claim 1 comprising recycling at least a portion of the produced hydrogen to the first stream or the second stream or both.
8 . The method of claim 1 , wherein the system does not generate electricity and does not need electricity input for the reactor zones to operate.
9 . The method of claim 1 , wherein the first zone is capable of reforming a hydrocarbon electrochemically and the second zone is capable of performing water gas shift reactions electrochemically, wherein the electrochemical reforming reactions involve the exchange of an ion through the membrane to oxidize the hydrocarbon and wherein the electrochemical water gas shift reactions involve the exchange of an ion through the membrane and include forward water gas shift reactions, or reverse water gas shift reactions, or both.
10 . The method of claim 9 , wherein the electrochemical reforming reactions comprise electrochemical half-cell reactions, wherein the half-cell reactions are:
a
.
C
H
4
+
O
2
-
⇌
CO
+
2
H
2
+
2
e
-
b
.
H
2
O
+
2
e
-
⇌
H
2
+
O
2
-
.
11 . The method of claim 9 , wherein the electrochemical water gas shift reactions comprise electrochemical half-cell reactions, wherein the half-cell reactions are:
a
.
CO
(
gas
)
+
O
2
-
⇌
CO
2
(
gas
)
+
2
e
-
b
.
H
2
O
(
gas
)
+
2
e
-
⇌
H
2
(
gas
)
+
O
2
-
.
12 . The method of claim 1 , wherein both reactor zones comprise porous electrodes that comprise a metallic phase and a ceramic phase, wherein the metallic phase is electronically conductive, and wherein the ceramic phase is ionically conductive.
13 . The method of claim 1 , wherein the membrane comprises an electronically conducting phase containing doped lanthanum chromite or an electronically conductive metal or combination thereof; and wherein the membrane comprises an ionically conducting phase containing a material selected from the group consisting of gadolinium doped ceria (CGO), samarium doped ceria (SDC), yttria-stabilized zirconia (YSZ), lanthanum strontium gallate magnesite (LSGM), scandia-stabilized zirconia (SSZ), Sc and Ce doped zirconia, and combinations thereof.
14 . The method of claim 1 , wherein the membrane comprises CoCGO or LST (lanthanum-doped strontium titanate)-stabilized zirconia.
15 . The method of claim 14 , wherein the stabilized zirconia comprises YSZ or SSZ or SCZ (scandia-ceria-stabilized zirconia).
16 . The method of claim 1 , wherein the membrane conducts electrons and oxide ions and wherein the system comprises no interconnect.
17 . The method of claim 1 , wherein the first reactor zone and the second reactor zone are in fluid communication on two sides of the membrane respectively but not across the membrane.
18 . The method of claim 1 , wherein the hydrocarbon passes through the first reactor zone prior to passing through the second reactor zone.
19 . The method of claim 1 , wherein the first reactor zone or the second reactor zone comprises multiple reactor tubes.
20 . The method of claim 1 , wherein the first reactor zone and the second reactor zone are on the same reactor tube or reactor tubes.Join the waitlist — get patent alerts
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