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公开(公告)号：US11318447B2
公开(公告)日：2022-05-03
申请号：US16512752
申请日：2019-07-16
Applicant: ExxonMobil Research and Engineering Company
Inventor： Matthew S. Ide , Changmin Chun , Anastasios I. Skoulidas
IPC: B01J23/78 , B01J21/04 , B01J23/94 , B01J38/02 , B01J37/16 , B01J38/12 , B01J35/00 , C01B3/40 , B01J12/00 , B01J35/04
Abstract: Ceramic compositions with catalytic activity are provided, along with methods for using such catalytic ceramic compositions. The ceramic compositions correspond to compositions that can acquire increased catalytic activity by cyclic exposure of the ceramic composition to reducing and oxidizing environments at a sufficiently elevated temperature. The ceramic compositions can be beneficial for use as catalysts in reaction environments involving swings of temperature and/or pressure conditions, such as a reverse flow reaction environment. Based on cyclic exposure to oxidizing and reducing conditions, the surface of the ceramic composition can be converted from a substantially fully oxidized state to various states including at least some dopant metal particles supported on a structural oxide surface.
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公开(公告)号：US20220235282A1
公开(公告)日：2022-07-28
申请号：US17643044
申请日：2021-12-07
Applicant: ExxonMobil Research and Engineering Company
Inventor： Brian M. Weiss , Sophie Liu , Michael R. Harper, JR. , Herbert W. Barry , Changmin Chun , Barrington S. Goldson , Justin R. Johnson , Faria Nusrat
Abstract: Systems and methods are provided for using a reverse flow reactor (or another reactor with flows in opposing directions at different parts of a process cycle) for pyrolysis of hydrocarbons. The systems and methods can include a reactor that includes a combustion catalyst to initiate and/or maintain combustion within the reactor in a controlled manner during the heating and/or regeneration portion(s) of the reaction cycle. A fuel can also be used that has a greater resistance to auto-combustion, such as a fuel that is composed primarily of methane and/or other hydrocarbons. During operation, the temperature in at least an initial portion of the reactor can be maintained at a temperature so that auto-ignition of the auto-combustion resistant fuel injected during the heating step(s) is reduced or minimized. This can allow combustion to be initiated when the auto-combustion resistant fuel comes into contact with the catalyst. Additionally, the amount and positioning of the catalyst within the reactor can be controlled so that combustion of the fuel takes place over a substantially longer period of time than combustion during a conventional reactor heating step. Because the fuel is moving within the reactor during combustion, extending the combustion time results in a substantial expansion of the volume where combustion occurs. Optionally in combination with an improved reaction cycle, this can expand the portion of the reactor that is directly heated by combustion, allowing for an improved temperature distribution within the reactor during the pyrolysis step.
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Patent Agency Ranking
公开(公告)号：US20220112432A1
公开(公告)日：2022-04-14
申请号：US17496644
申请日：2021-10-07
Applicant: ExxonMobil Research and Engineering Company
Inventor： Wesley Sattler , Keith R. Hajkowski , Changmin Chun , Partha Nandi , Vera Grankina , Joseph E. Gatt , Ning Ma , Anastasios Skoulidas , William R. Gunther , Everett J. O'Neal
Abstract: Systems and methods are provided for using size-reversing materials in vessels where direct heating is used to at least partially provide heat for reforming reactions under cyclic reforming conditions. An example of a size-reversing material is the combination of NiO and Al2O3. It has been discovered that size-reversing materials can undergo a phase transition that can assist with re-dispersion of metal at elevated temperatures. This can assist with maintaining catalytic activity for reforming over longer time periods in the presence of cyclic reforming conditions.
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公开(公告)号：US20220112082A1
公开(公告)日：2022-04-14
申请号：US17496592
申请日：2021-10-07
Applicant: ExxonMobil Research and Engineering Company
Inventor： Changmin Chun , Wesley Sattler , Joseph E. Gatt , Keith R. Hajkowski , Everett J. O'Neal , William R. Gunther , Anastasios Skoulidas
IPC: C01B3/38 , B01J35/10 , B01J37/08 , C01B3/40 , B01J29/74 , B01J23/46 , B01J21/04 , B01J23/10 , B01J23/755 , B01J23/00 , B01J35/00 , B01J35/04 , B01J37/03 , B01J37/04
Abstract: Catalyst systems are provided for reforming of hydrocarbons, along with methods for using such catalyst systems. The catalyst systems can be deposited or otherwise coated on a surface or structure, such as a monolith, to achieve improved activity and/or structural stability. The metal oxide support layer can correspond to a thermally stable metal oxide support layer, such as a metal oxide support layer that is thermally phase stable at temperatures of 800° C. to 1600° C. The catalyst systems can be beneficial for use in cyclical reaction environments, such as reverse flow reactors or other types of reactors that are operated using flows in opposing directions and different times within a reaction cycle.
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公开(公告)号：US20200030779A1
公开(公告)日：2020-01-30
申请号：US16512752
申请日：2019-07-16
Applicant: ExxonMobil Research and Engineering Company
Inventor： Matthew S. Ide , Changmin Chun , Anastasios I. Skoulidas
IPC: B01J23/78 , B01J35/04 , B01J21/04 , B01J23/94 , B01J38/02 , B01J37/16 , B01J38/12 , B01J35/00 , C01B3/40 , B01J12/00
Abstract: Ceramic compositions with catalytic activity are provided, along with methods for using such catalytic ceramic compositions. The ceramic compositions correspond to compositions that can acquire increased catalytic activity by cyclic exposure of the ceramic composition to reducing and oxidizing environments at a sufficiently elevated temperature. The ceramic compositions can be beneficial for use as catalysts in reaction environments involving swings of temperature and/or pressure conditions, such as a reverse flow reaction environment. Based on cyclic exposure to oxidizing and reducing conditions, the surface of the ceramic composition can be converted from a substantially fully oxidized state to various states including at least some dopant metal particles supported on a structural oxide surface.
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公开(公告)号：US20220274085A1
公开(公告)日：2022-09-01
申请号：US17632092
申请日：2020-07-30
Applicant: ExxonMobil Research and Engineering Company
Inventor： Brian M. Weiss , Changmin Chun , Sophie Liu , Federico Barrai , Paul F. Keusenkothen , Zachary D. Young
Abstract: A reverse flow reactor (RFR) and process having a forward reaction feed cycle, a reverse reaction feed cycle, and a reverse regeneration cycle. The heat convected in the forward feed cycle matches the heat convected in the reverse flow cycles. Compared to an RFR without the reverse feed cycle, the three-cycle RPR substantially reduces the regeneration air flow rate, associated compression requirements, and the overall reactor volume, that are required.
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公开(公告)号：US20200030778A1
公开(公告)日：2020-01-30
申请号：US16512688
申请日：2019-07-16
Applicant: ExxonMobil Research and Engineering Company
Inventor： Matthew S. Ide , Changmin Chun , Anastasios I. Skoulidas
IPC: B01J23/755 , B01J21/08 , B01J37/00 , C10G35/06 , C10J3/72 , B01J35/00 , B01J35/04 , B01J21/04 , B01J21/06 , B01J37/14 , B01J37/16 , B01J37/02 , B01J35/10
Abstract: Ceramic compositions with catalytic activity are provided, along with methods for using such catalytic ceramic compositions. The ceramic compositions correspond to compositions that can acquire increased catalytic activity by cyclic exposure of the ceramic composition to reducing and oxidizing environments at a sufficiently elevated temperature. The ceramic compositions can be beneficial for use as catalysts in reaction environments involving swings of temperature and/or pressure conditions, such as a reverse flow reaction environment. Based on cyclic exposure to oxidizing and reducing conditions, the surface of the ceramic composition can be converted from a substantially fully oxidized state to various states including at least some dopant metal particles supported on a structural oxide surface.
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