Chinese Journal of Catalysis ›› 2026, Vol. 84: 25-60.DOI: 10.1016/S1872-2067(26)65006-1
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Yu Gua(
), Shujia Zhanga, Minglu Xua, Hao Yanb, Minghao Zhoua, Lei Wanga(
), Hui Shia
Received:2025-09-24
Accepted:2025-11-16
Online:2026-05-18
Published:2026-04-16
Contact:
*E-mail: guyu@yzu.edu.cn (Y. Gu),About author:Yu Gu (College of Chemistry and Chemical Engineering, Yangzhou University) Yu Gu received his B.S. in Applied Chemistry from China University of Petroleum (East China) in 2015, and Ph. D. in Chemical Engineering & Technology from China University of Petroleum (East China) in 2021. He is currently an associated professor at Yangzhou University, Jiangsu province, China. He focuses on the catalytic conversion of light alkanes such as methane dehydroaromatization, its co-aromatization with propane/butane, propane dehydrogenation & aromatization, etc.; and catalytic upgrading of polyolefin plastics. His research approach combines synthesis, characterizations and mechanism investigation over metal catalysts supported on zeolites, alumina, silica and ceria, etc.Supported by:Yu Gu, Shujia Zhang, Minglu Xu, Hao Yan, Minghao Zhou, Lei Wang, Hui Shi. Dehydroaromatization of methane and methane co-aromatization process with propane: Reaction mechanism, catalyst design, carbon deposition and process optimization[J]. Chinese Journal of Catalysis, 2026, 84: 25-60.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(26)65006-1
| Reaction | Temperature when ΔrGθ m = 0 (°C) |
|---|---|
| CH4 → C + 2H2 | 553 |
| 2CH4 → C2H4 +2H2 | 1323 |
| 2CH4 → C2H6 + H2 | > 2227 |
| 3CH4 → C3H6 + 3H2 | 1582 |
| 3CH4 → C3H8 + 2H2 | > 2227 |
| 6CH4 → C6H6 + 6H2 | 1042 |
| 7CH4 → C7H8 + 10H2 | 1118 |
| 10CH4 → C10H8 + 16H2 | 1017 |
Table 1 The temperature at which dehydrogenation reactions occur spontaneously extracted from Ref. [11].
| Reaction | Temperature when ΔrGθ m = 0 (°C) |
|---|---|
| CH4 → C + 2H2 | 553 |
| 2CH4 → C2H4 +2H2 | 1323 |
| 2CH4 → C2H6 + H2 | > 2227 |
| 3CH4 → C3H6 + 3H2 | 1582 |
| 3CH4 → C3H8 + 2H2 | > 2227 |
| 6CH4 → C6H6 + 6H2 | 1042 |
| 7CH4 → C7H8 + 10H2 | 1118 |
| 10CH4 → C10H8 + 16H2 | 1017 |
| Product | Temperature (°C) | |||||
|---|---|---|---|---|---|---|
| 25 | 327 | 527 | 727 | 927 | 1127 | |
| C | 0 | 4.8% | 33.4% | 75.5% | 93.7% | 98.1% |
| C6H6 | 0 | 0.1% | 2.4% | 13.3% | 36.9% | 63.6% |
| C7H8 | 0 | 0.1% | 1.9% | 10.6% | 30.0% | 54.2% |
| C10H8 | 0.2% | 0.2% | 2.3% | 13.1% | 36.7% | 63.6% |
Table 2 Equilibrium conversion to carbon and other aromatics at various temperature extracted from Ref. [11].
| Product | Temperature (°C) | |||||
|---|---|---|---|---|---|---|
| 25 | 327 | 527 | 727 | 927 | 1127 | |
| C | 0 | 4.8% | 33.4% | 75.5% | 93.7% | 98.1% |
| C6H6 | 0 | 0.1% | 2.4% | 13.3% | 36.9% | 63.6% |
| C7H8 | 0 | 0.1% | 1.9% | 10.6% | 30.0% | 54.2% |
| C10H8 | 0.2% | 0.2% | 2.3% | 13.1% | 36.7% | 63.6% |
Fig. 2. Maximum thermodynamically allowed levels of non-oxidative methane conversion to hydrogen and ethylene, benzene, coronene, and graphite. Reprinted with permission from Ref. [3]. Copyright 2020, John Wiley and Sons.
Fig. 3. MDA mechanism on Mo/ZSM-5 catalyst with ethylene as the intermediate. Reprinted with permission from Ref. [20]. Copyright 2014, John Wiley and Sons.
Fig. 4. Scheme of hydrocarbon pool mechanism in MDA. R: benzene ring; ball in red: 13C atom; ball in blue: 12C atom; ball in black: H atom. Reprinted with permission from Ref. [27]. Copyright 2017, John Wiley and Sons.
Fig. 5. Gibbs free energy of hydrogenation/dehydrogenation as a function of temperature over Co catalyst. Reprinted with permission from Ref. [30]. Copyright 1992, Elsevier.
Fig. 6. Scheme of the formation of dehydrogenation-active MoCx cluster. Reprinted with permission from Ref. [41]. Copyright 2001, American Chemical Society.
Fig. 7. Scheme of possible positions of Fe within ZSM-5: isolated ions either in framework positions (a) or at the exchange sites (b), bi- and oligonuclear iron complexes in extra-framework positions (c), iron oxide FexOy nanoclusters of size ≤0.55 nm (d), and large iron oxide nanoparticles (Fe2O3) either located at the surface of the zeolite crystal (e) or embedded between the zeolite crystallites (f). Reprinted with permission from Ref. [49]. Copyright 2016, Royal Society of Chemistry.
Fig. 8. Benzene yield as a function of methane pulse numbers over Mo/ZSM-5 catalysts with different Mo loadings. The first 17 pulses (No. ?17 to No. 0) during which no benzene production is detected are categorized as the activation period. Then from the onset of benzene production (pulse No. 1) to a maximum yield (about pulse No. 12 to No. 15), the duration is called induction period. Adapted with permission from Ref. [28]. Copyright 2017, John Wiley and Sons.
Fig. 9. Pathway of methane C?H bond activation over Mo monomers compared to Fe monomers anchored to HZSM-5. Reprinted with permission from Ref. [67]. Copyright 2017, John Wiley and Sons.
Fig. 10. (a) Mo?ssbauer spectra of fresh Fe/ZSM-5 catalysts (2 wt% and 4 wt% Fe loadings) synthesized via a co-crystallization (GSM) and impregnation (IWI) method; GSM catalysts mainly exhibit superparamagnetic low-polymerized Fe3+ oxides inside MFI pores, while on IWI catalysts the Fe3+ oxides are mainly magnetic Fe2O3 particles on the external surface. (b) Schematic correlations between Fe active sites and induction period in MDA reaction. It illustrates that the highly dispersed Fe3+ oxides inside MFI pores could be quickly reduced to sub-oxides thus shorten the induction period, while the big iron oxides particles located at the external surface undergo complete reduction and slow carburization, resulting in a longer induction period. Adapted with permission from Ref. [70]. Copyright 2021, American Chemical Society.
Fig. 11. (a) Electronic edge values based on in situ UV-vis spectra of reference Mo oxide compounds, exhibiting a linear correlation with the number of bridging Mo-O-Mo covalent bonds around the central Mo cation. The value of 4.8 eV for 2 wt% Mo/ZSM-5 (Si/Al = 15) corresponds to Mo oxide species with a single Mo atom. In-situ Raman spectra of Mo/ZSM-5 catalysts under oxygen flow at 773 K as a function of Mo loading for constant Si/Al = 15 (b) and Si/Al ratio for constant 1.3 wt% Mo loading (c) with band assignments to Mo oxide species based on DFT calculations. Reprinted with permission from Ref. [45] Copyright 2015, American Association for the Advancement of Science.
Fig. 12. Conversion and aromatics yield rates after 6 h in MDA over different physically mixed catalysts. Reprinted with permission from Ref. [91]. Copyright 2024, American Chemical Society.
Fig. 13. 13C NMR spectra (a) and DTG profile (b) of spent Mo/ZSM-5 catalyst after different time-on-stream of MDA reaction. TEM picture (c), Ar-physisorption isotherm (d) and derived pore size distribution (e) of the carbon materials obtained after HF leaching of spent Mo/ZSM-5. (f) Structural model of MFI-templated carbon material viewing along b-axis. Reprinted with permission from Ref. [99]. Copyright 2018, American Chemical Society.
Fig. 14. (a) Illustration for the synthesis procedure of hollow H-S-Z capsule zeolite. (b) EDS line analysis of Si element on the cross-section of zeolite capsule structure, showing that Si is located only within the shell of the catalyst. (c) SEM picture, blast holes can be seen after the removal of active carbon template via combustion. Benzene formation rate curves as a function of TOS (d) and TG-DTA profiles of Mo-loaded H-S-Z capsule zeolite and conventional Silicalite-1/ZSM-5 after MDA reaction (e). (f) Scheme of the MDA reaction on Mo/H-S-Z catalyst. Reprinted with permission from Ref. [100]. Copyright 2017, Royal Society of Chemistry.
Fig. 15. (a) HR-TEM picture. EDS-mapping analysis of Si (b) and O (c) elements for ZSM-5 after 24 h treatment in TPAOH solutions. Benzene yield curves as a function of TOS (d) and TG profiles of spent Mo-loaded catalysts based on conventional and TPAOH treated ZSM-5 zeolite (e). The number in the parenthesis indicates different treating time (hour). Reprinted with permission from Ref. [101]. Copyright 2023, Elsevier.
Fig. 16. (a) SEM picture of catalyst MFI-10/0 with lamellar morphology and combined microporous-mesoporous structure. (b) SEM picture of catalyst MFI-10/36 showing conventional MFI morphology without lamellar structure. TG profiles (c) and internal/external coke distribution (d) of spent Mo-loaded catalysts. Notes: The numbers 10 and x in sample MFI-10/x represent the molar fraction of C22-6-6 and TPAOH to SiO2 in the synthesis gel (taking SiO2 as 100); with the increase of x, the obtained catalysts gradually lose the characteristics of lamellar structure and resemble conventional MFI morphology, see Fig. (b); In Fig. (c), the carbon deposits of MFI-10/0 is the highest, indicating that the lamellar structure has abundant mesopores that can accommodate carbon deposits, as the lamellar structure gradually disappears, the carbon deposits after MDA reaction also gradually decreases, and the proportion of coke inside the pores increases significantly. Reprinted with permission from Ref. [104]. Copyright 2015, Elsevier.
Fig. 17. (a) HAADF-STEM images of four Mo/HZSM-5 catalysts Mo/Z5(2), Mo/Z5(60), Mo/Z5(400) and Mo/Z5-C with dimensions along the b-axis of 2, 60 and 400 nm, respectively, (Mo/Z5-C means Mo is support on commercial ZSM-5 with b-axis length of ~400 nm but a much longer a-axis length than Mo/Z5(400)). (b) Methane conversion and benzene yield of Mo/Z5(60) and Mo/Z5(400) as a function of TOS during MDA reaction, that Mo/Z5(60) shows a much faster deactivation (2.88h) than Mo/Z5(400) (4.56 h). (c) Integrated NH3-TPD peak areas of parent Z5 (blue dots) and Mo loaded Mo/Z5 (red dots) determined at different TOS, in which acid sites are kept on Mo/Z5(60) during MDA reaction, while they are gradually lost on Mo/Z5(400). (d) HAADF-STEM images of spent Mo/Z5(60) after 300 min and Mo/Z5(400) after 600 min of MDA reaction, that sintered molybdenum carbide particles are obvious on spent Mo/Z5(60) (5?20 nm bright spots) but are barely seen on spent Mo/Z5(400). (e) TEM pictures of spent Mo/Z5(60), showing carbon deposits covering MoCx particles with layers thickness of 3?4 nm. Reprinted with permission from Ref. [109]. Copyright 2021, Elsevier.
Fig. 18. Methane conversion (a) and cumulative selectivity of main products (b) for nano-sized ellipsoid, hexagonal bar and coffin shaped Mo/ZSM-5 catalyst during MDA, respectively. (c) TG profiles of spent Mo-loaded catalysts. (d) Schematic structure-performance relationships in the three catalysts: although the smallest nano-sized ellipsoid catalysts possess the shortest intra-diffusion, it generated largest coke accumulation due to the inter-diffusional restrictions. The elongated coffin-shaped zeolite could suffer from longest intra-diffusion, but the lowest coke accumulation could be expected due to the homogeneous coke distribution. Reprinted with permission from Ref. [110]. Copyright 2023, Elsevier.
Fig. 19. Cumulative hydrocarbon selectivities and methane conversion on a 2 wt% Mo/H-ZSM-5 after 14 hours of MDA reaction at 725 °C under different feeding water partial pressure. This picture shows that methane conversion together with aromatics selectivity increase with water partial pressure increasing from 0 to 0.037, along with a decaying coking selectivity. However, the trend reverses when water partial pressure is further elevated to 0.107. Reprinted with permission from Ref. [26]. Copyright 2021, American Chemical Society.
Fig. 20. (a) Scheme of the current-controlled co-ionic membrane reactor, that CH4 is converted to benzene and hydrogen catalyzed by a 6Mo/MCM-22 catalyst packed within the interlayer outside the membrane. H2 generated there is transported as protons through the membrane to the sweep side, and oxide ions from the reduction of steam in the sweep side are transported through the membrane to the MDA reaction side to react with H2 and form steam to remove coke deposition. (b) Aromatics yield versus time in both the membrane reactor and a conventional fixed bed reactor in MDA. (c) Corresponding coke amount and cumulative aromatics production in 6Mo/MCM-22 within the above two reactors. Reprinted with permission from Ref. [129]. Copyright 2016, American Association for the Advancement of Science.
Fig. 21. Simplified (a) and detailed (b) piping and instrumentation diagram of the constructed looping reactor system used for methane recirculation, and the states in the three reactors marked in dashed red squares in section 1, 2 and 3 correspond to processes of methane dehydroaromatization, Fe3O4 being reduced to FeO by H2, and water being adsorbed by molecular sieves, respectively; meanwhile, the states in the three reactors marked in dashed blue squares in section 1, 2 and 3 corresponds to the opposite processes parallel to their counterparts, namely carbon combustion of coked MDA catalysts, FeO being oxidized to Fe3O4 by H2O, and water desorption from molecular sieves, respectively. (c) CH4 conversion and main product yields in a 2 cycle testing. Reprinted with permission from Ref. [132]. Copyright 2021, Elsevier.
Fig. 22. (a) STEM-HAADF image and computational model (inset) of the Fe@SiO2 catalyst. (b) Methane conversion and ethylene, benzene and other aromatics selectivity versus TOS over this catalyst at 1090 °C. Negligible coke was observed. Reprinted with permission from Ref. [2]. Copyright 2014, American Association for the Advancement of Science.
Fig. 23. (a) Temperature and gas flow profiles used for all tests. (b) Time-courses of methane conversions as a function of TOS in the tests with different cycle periods over 5 wt% Mo/HZSM-5 at 1073 K and 21080 mL/(g·h), while only CH4 flow times were accounted and accumulated in the figure. (c) TPO profiles of spent catalysts exposed to CH4 for different durations. (d) Time-courses of benzene and naphthalene formation rates obtained in a large degree of deactivation-long time regeneration cycle test over 5%Mo/HZSM-5 at 1073 K and 21080 mL/(g·h). (e) Schematic diagram of a proposed triple-bed circulating fluidized bed reactor system: (1) CH4 converter, (2) regenerator in the main stream with a short mean residence time of catalyst particles and (3) regenerator in the sub-stream with a long mean residence time. Reprinted with permission from Ref. [123]. Copyright 2011, Elsevier.
Fig. 24. (a) Schematic illustration of the selective removal of Ga from impregnated Ga/Z catalysts by hydrochloric acid (HA) treatment. (b) Ga content and textural properties of Ga/Z-xHA, and the number before HA stands for the molar concentration of the treating HCl solution. It could be seen that after HA treatment the catalyst loses most of its Ga loading, and more micropores are dug up. (c) Propane conversion and BTX yield of Ga/Z-xHA catalysts as a function of TOS. Reprinted with permission from Ref. [171]. Copyright 2022, Elsevier.
Fig. 25. Scheme of π-complex and σ-allylzinc species as intermediates during propane conversion to aromatics over Zn supported on Beta zeolite. Reprinted with permission from Ref. [175]. Copyright 2010, American Chemical Society.
Fig. 26. Proposed propane aromatization processes mediated by cyclopentenyl cations over Ga/ZSM-5: direct dehydroaromatization (a) and carbocation promoted dehydroaromatization (b). Reprinted with permission from Ref. [178]. Copyright 2021, John Wiley and Sons.
Fig. 28. Catalytic performance of GaOy/meso-XHZSM-5 (X means Si/Al ratio) catalysts: conversion of methane and propane (a) and BTX yield (b). Reprinted with permission from Ref. [194]. Copyright 2019, Royal Society of Chemistry.
Fig. 29. (a) Scheme of one step synthesis (OSS) procedure of Ga/ZSM-5 catalysts. (b) 71Ga NMR spectra of OSS catalysts and impregnated ones, showing that most of the Ga species are in tetrahedral coordination within or in close contact with zeolite framework in OSS catalysts, while Ga resides mainly on the external surface of ZSM-5 as big Ga2O3 particles. (c) Schematic illustration of improved MPCA performance via highly dispersed Ga sites within the zeolite channels. (d) Total aromatic yield as a function of TOS, that OSS catalysts exhibit higher yield than their impregnated counterparts. (e) Methane conversion, propane conversion and benzene selectivity on OSS catalysts with different Si/Al ratio, that methane conversion increases gradually with Si/Al while propane shows a reversed trend, and benzene selectivity is barely affected by Si/Al. (f) Schematic illustration of the role of BAS in MPCA. Reprinted with permission from Ref. [196]. Copyright 2024, American Chemical Society.
Fig. 30. Calculated equilibrium methane conversion as functions of CH4/C3H8 molar ratio in the feed, based on two different reaction models: (a) Model I, in which no limitation is imposed on reaction pathways among the reacting species, or that is to say under which methane formation via propane cracking could happen. (b) Model II, in which methane formation by propane cracking is inhibited. Reaction temperature: 600 °C, pressure: 1.01 bar. Reprinted with permission from Ref. [199]. Copyright 2014, American Chemical Society.
Fig. 31. Probable pathway of the 13C-labeled methane involvement into aromatic products during MPCA. Reprinted with permission from Ref. [198]. Copyright 2013, American Chemical Society.
| Process | Feed | Reaction temperature | Used catalyst | Thermodynamic upper limit of methane conversion to benzene | Industrialized |
|---|---|---|---|---|---|
| MDA | Methane | > 700 °C | Mo/ZSM-5 | About 12% at 700 °C | No |
| PDA | Propane | 500‒600 °C | Ga/ZSM-5, Zn/ZSM-5, Pt/ZSM-5 | — | Yes |
| MPCA | Methane & propane | 500‒600 °C | Ga/ZSM-5, Zn/ZSM-5 | No widely-accepted value 1 | No |
Table 3 Comparison between MDA, PDA and MPCA.
| Process | Feed | Reaction temperature | Used catalyst | Thermodynamic upper limit of methane conversion to benzene | Industrialized |
|---|---|---|---|---|---|
| MDA | Methane | > 700 °C | Mo/ZSM-5 | About 12% at 700 °C | No |
| PDA | Propane | 500‒600 °C | Ga/ZSM-5, Zn/ZSM-5, Pt/ZSM-5 | — | Yes |
| MPCA | Methane & propane | 500‒600 °C | Ga/ZSM-5, Zn/ZSM-5 | No widely-accepted value 1 | No |
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