公开(公告)号：US11577955B2

公开(公告)日：2023-02-14

申请号：US16540300

申请日：2019-08-14

Applicant: EXXONMOBIL TECHNOLOGY AND ENGINEERING COMPANY

Inventor： Ramesh Gupta ,  Sumathy Raman ,  Hugo S. Caram ,  David C. Dankworth

IPC: C01B31/02 ,  C01B3/34 ,  C01B32/05 ,  B01J6/00 ,  C01B3/24

Abstract: Systems and methods for molten media pyrolysis for the conversion of methane into hydrogen and carbon-containing particles are disclosed. The systems and methods include the introduction of seed particles into the molten media to facilitate the growth of larger, more manageable carbon-containing particles. Additionally or alternatively, the systems and methods can include increasing the residence time of carbon-containing particles within the molten media to facilitate the growth of larger carbon-containing particles.

公开(公告)号：US11591212B2

公开(公告)日：2023-02-28

申请号：US16540277

申请日：2019-08-14

Applicant: ExxonMobil Technology and Engineering Company

Inventor： Ramesh Gupta ,  Sumathy Raman ,  Hugo S. Caram ,  David C. Dankworth

IPC: C01B32/05 ,  C01B3/24 ,  C01B3/34 ,  C01B3/26

Abstract: Systems and methods for molten media pyrolysis for the conversion of methane into hydrogen and carbon-containing particles are disclosed. The systems and methods include the introduction of seed particles into the molten media to facilitate the growth of larger, more manageable carbon-containing particles. Additionally or alternatively, the systems and methods can include increasing the residence time of carbon-containing particles within the molten media to facilitate the growth of larger carbon-containing particles.

公开(公告)号：US11629056B2

公开(公告)日：2023-04-18

申请号：US17124113

申请日：2020-12-16

Applicant: ExxonMobil Technology and Engineering Company

Inventor： Ramesh Gupta ,  Sumathy Raman ,  Amrit Jalan ,  Hugo S. Caram ,  David C. Dankworth

IPC: C01B32/162 ,  B01J6/00

Abstract: Systems and methods are provided for production of carbon nanotubes and H2 using a reaction system configuration that is suitable for large scale production. In the reaction system, a substantial portion of the heat for the reaction can be provided by using a heated gas stream. Optionally, the heated gas stream can correspond to a heated H2 gas stream. By using a heated gas stream, when the catalyst precursors for the floating catalyst-chemical vapor deposition (FC-CVD) type catalyst are added to the gas stream, the gas stream can be at a temperature of 1000° C. or more. This can reduce or minimize loss of catalyst precursor material and/or deposition of coke on sidewalls of the reactor. Additionally, a downstream portion of the reactor can include a plurality of flow channels of reduced size that are passed through a heat exchanger environment, such as a shell and tube heat exchanger. This can provide cooling of the gas flow after catalyst formation to allow for carbon nanotube formation, while also reducing the Reynolds number of the flow sufficiently to provide laminar flow within the region where carbon nanotubes are formed.