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Title: A combined experimental and modeling study of Microwave-assisted methane dehydroaromatization process

Journal Article · · Chemical Engineering Journal
 [1];  [2];  [1];  [2];  [1];  [1];  [3];  [1];  [1]
  1. West Virginia University, Morgantown, WV (United States)
  2. National Energy Technology Lab. (NETL), Morgantown, WV (United States); National Energy Technology Lab. (NETL), Morgantown, WV (United States). Leidos Research Support Team
  3. National Energy Technology Lab. (NETL), Morgantown, WV (United States)

We report the challenges in direct methane conversion to higher-value chemicals include rapid catalyst deactivation and comparatively low single-pass conversion. The most important step in direct methane conversion is the activation of strong C-H bonds. In this paper, we integrated microwave irradiation with heterogeneous catalysis to enable a higher methane conversion to C2 and aromatics at low temperature. The results showed that the methane conversion can reach 18% at 550 °C under microwave irradiation, while a temperature higher than 800 °C was required to achieve the same level of methane conversion in a traditional fixed-bed reactor. The microwave radiation may facilitate this heterogeneous catalysis process both thermally and non-thermally. Thermal effect, as known as “hot spots”, can be characterized experimentally. The results indicated the “hot spot” temperature can reach as high as 800 °C while the bulk temperature stayed at 550 °C. However, the non-thermal effect is difficult to characterize due to the limitations of existing in-situ instrumentations. Finite-element modeling can be a powerful engineering tool to simulate and understand complex physic fields. The simulation results show that between spherical catalyst particles the electric field on the catalyst bed was at a level of 104 V/m and the non-uniform electric field distribution on the catalyst bed. Under this level of external electric field, methane activation on the catalyst surface was possible. These field distributions can explain the non-thermal effects of microwave-assisted catalytic chemical reactions, supported by the observation of benzene hydrogenolysis side reaction. With the thermal and non-thermal effects from microwave radiation, microwave-assisted heterogeneous catalytic process can be an attractive solution to activate stable feedstock molecules and can be applied to direct methane conversion process.

Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
89243318CFE000003
OSTI ID:
1888743
Journal Information:
Chemical Engineering Journal, Journal Name: Chemical Engineering Journal Journal Issue: N/A Vol. 433; ISSN 1385-8947
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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