Dehydrogenation of perhydro-dibenzyltoluene for hydrogen production in a microchannel reactor

Ali, Ahsan; Rohini, Ajith Krishnan; Lee, Hee Joon

doi:10.1016/j.ijhydene.2022.04.212

Cited by 24 publications

(13 citation statements)

References 58 publications

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“…At this temperature, 97% of the stored H 2 was released within 2 h . In another study, H 2 production reached 58% in the dehydrogenation of 18H-DBT at 290 °C, catalyzed by a 2 wt % Pt/Al 2 O 3 catalyst after 2 h . The dehydrogenation of 18H-DBT was carried out over a temperature range of 280–360 °C and 101 kPa using a 5 wt % Pt/Al 2 O 3 catalyst.…”

Section: Resultsmentioning

confidence: 99%

“…Bruckner et al found that the optimal temperature for 18H-DBT dehydrogenation over a 1 wt % Pt/C catalyst was 290 °C. At this temperature, 97% of the stored H 2 was released within 2 h. 53 In another study, H 2 production reached 58% in the dehydrogenation of 18H-DBT at 290 °C, catalyzed by a 2 wt % Pt/Al 2 O 3 catalyst after 2 h. 54 The dehydrogenation of 18H-DBT was carried out over a temperature range of 280−360 °C and 101 kPa using a 5 wt % Pt/Al 2 O 3 catalyst. Figure 5(a) clearly demonstrates the steady increase in dehydrogenation rates as the temperature rises from 280 to 360 °C.…”

Section: ■ Introductionmentioning

confidence: 99%

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Identifying Noble Metal Catalysts for the Hydrogenation and Dehydrogenation of Dibenzyltoluene: A Combined Theoretical–Experimental Study

Liu,

Zhu,

Xia

et al. 2023

Inorg. Chem.

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We present a comprehensive theoretical and experimental investigation of the hydrogenation and dehydrogenation of dibenzyltoluene (DBT) using Pd-, Pt-, Ru-, and Rh-supported metal catalysts to identify the optimal catalysts for hydrogen storage and release processes. Our results demonstrated significant variation in the catalytic activity of the metal catalysts. 5 wt % Rh/Al 2 O 3 and 5 wt % Pt/Al 2 O 3 showed the highest activity for hydrogenation and dehydrogenation with the highest selectivity and turnover frequency (TOF), respectively. Conversely, 5 wt % Pd/Al 2 O 3 and 5 wt % Ru/Al 2 O 3 exhibited lower catalytic activity toward full hydrogenation and dehydrogenation. Rh/Al 2 O 3 showed the best catalytic hydrogenation activity with a TOF of 26.49 h −1 and a hydrogenation degree of 92.69% in 2 h, while Pt/Al 2 O 3 exhibited the best catalytic dehydrogenation activity with a released H 2 volume of 3755 mL, a dehydrogenation degree of 78.23%, and a TOF of 39.56 h −1 in 2 h. Additionally, we estimated the activation energies for hydrogenation and dehydrogenation to be 67.20 and 82.78 kJ/mol, respectively. Notably, the produced hydrogen gas was of high purity and suitable for use in fuel cells. Density functional theory (DFT) calculations were used to analyze the adsorption structure and reaction energy changes of all intermediate products of DBT on the surface of the chosen catalysts. Our research provides valuable insights into developing efficient catalysts for liquid organic hydrogen carriers.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Identifying Noble Metal Catalysts for the Hydrogenation and Dehydrogenation of Dibenzyltoluene: A Combined Theoretical–Experimental Study

Liu,

Zhu,

Xia

et al. 2023

Inorg. Chem.

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“…The infrastructure currently in place for moving gasoline may potentially be used for its transportation. Dehydrogenation is thought to take place at temperatures of about 300 °C because of the enthalpy of the perhydro-DBT reaction (65.4 kJ mol –1 ) . The dehydrogenation and hydrogenation processes, however, are slowed down by the substantially greater viscosities of DBT and its hydrogenated product, which also makes transportation difficult …”

Section: Methods Of Hydrogen Storagementioning

confidence: 99%

“…Dehydrogenation is thought to take place at temperatures of about 300 °C because of the enthalpy of the perhydro-DBT reaction (65.4 kJ mol −1 ). 194 The dehydrogenation and hydrogenation processes, however, are slowed down by the substantially greater viscosities of DBT and its hydrogenated product, which also makes transportation difficult. 193 The perhydro-benzyltoluene/MBT system may gain greater significance in the future as a result of the notion of reactive distillation that Geißelbrecht et al developed.…”

Section: Methanol As Hydrogen Storagementioning

confidence: 99%

Potential Benefits, Challenges and Perspectives of Various Methods and Materials Used for Hydrogen Storage

Panigrahi,

Chandu,

Motapothula

et al. 2024

Energy Fuels

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Fossil fuels, which are extremely harmful to the environment and not renewable, predominantly serve the majority of the world's energy needs. Currently, hydrogen is regarded as the fuel of the future due to its many advantages, such as its high calorific values, high gravimetric energy density, eco-friendliness, and nonpolluting nature, as well as being a zero-emission energy source. For sustainable global growth, it is essential to produce and store hydrogen on a large scale by utilizing renewable energy sources. However, hydrogen storage systems, particularly for vehicle on-board applications, face challenges in terms of developing energy-efficient and affordable techniques and materials due to hydrogen's buoyancy, lightness, and high diffusivity. This Review systematically discusses various hydrogen storage methods and materials, including physical storage like compressed gas, physical adsorption storage like carbon-based materials, metal−organic frameworks (MOFs), and other porous materials, as well as chemical storage like ammonia, methanol, formic acid, liquid organic hydrogen carriers (LOHCs), metal hydrides, and two-dimensional MXene-based materials. The advantages of various storage mechanisms are thoroughly discussed, as well as any potential implementation difficulties for realworld uses and future prospects.

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“…Efforts have been directed toward increasing product yields by using microchannel reactors. , Significant advantages are to be gained by enhancing heat and mass transfer, , and more aggressive conditions are often tolerated. However, careful control of the conditions of highly exothermic systems or processes is necessary if satisfactory isothermal conditions are to be achieved.…”

Section: Introductionmentioning

confidence: 99%

Effects of Stack Structure and Heat Loss on the Stability and Efficiency of Steam-Methanol Reforming Microreactors for Hydrogen Production

Chen

Miao

2023

Ind. Eng. Chem. Res.

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The linear scale-out approximation ignores the influence of exterior heat loss and thus cannot address extinction issues. The present study is focused primarily upon the roles of stack structure and heat loss in the stability and efficiency of microreactors for hydrogen production by steam-methanol reforming. Computer simulations are performed to model the complex physicochemical processes in a variety of different heat loss situations. The effects of channel number, wall thermal conductivity, and surface-area-to-volume ratio are investigated to assess the importance of stack structure and heat loss in microreactor design. The results indicate that the total heat loss becomes increasingly significant for designing reactors with small stacks of channels. About half of heat released is lost if a global-type extinction occurs. The critical heat loss coefficient depends heavily upon the number of channels. The design with a large stack of channels more closely beneficially improves heat utilization and reduces heat loss. There is a significant linear relationship between energy efficiency and heat loss coefficient. Significant heat loss may cause extinction in edge channels while still permitting very high conversion in center channels. The wall thermal conductivity is of vital importance to ensure stability operation. Higher wall thermal conductivity provides stability benefits, but walls with very low thermal conductivity can be employed to reduce heat loss by sacrificing the thermal coupling capability.

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Dehydrogenation of perhydro-dibenzyltoluene for hydrogen production in a microchannel reactor

Cited by 24 publications

References 58 publications

Identifying Noble Metal Catalysts for the Hydrogenation and Dehydrogenation of Dibenzyltoluene: A Combined Theoretical–Experimental Study

Identifying Noble Metal Catalysts for the Hydrogenation and Dehydrogenation of Dibenzyltoluene: A Combined Theoretical–Experimental Study

Potential Benefits, Challenges and Perspectives of Various Methods and Materials Used for Hydrogen Storage

Effects of Stack Structure and Heat Loss on the Stability and Efficiency of Steam-Methanol Reforming Microreactors for Hydrogen Production

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