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Journal of Mechanical Science and Technology

, Volume 33, Issue 11, pp 5561–5569 | Cite as

Catalytic hydrogenation and dehydrogenation performance of 9-ethylcarbazole as a liquid organic hydrogen carrier

  • Ahsan Ali
  • Udaya Kumar G
  • Hee Joon LeeEmail author
Article
  • 1 Downloads

Abstract

The hydrogenation characteristics of 9-ethylcarbazole (9-ECZ) over Raney-Ni catalyst within the pressure range 0.2–0.8 MPa was investigated in this work. Initially, hydrogenation experiments were performed over various catalysts which revealed that 5 wt.% Ru/Al2O3 was the most active catalyst, whereas, Raney-Ni being least expensive was chosen for this study. Ten grams of 9-ECZ and 1 g of Raney-Ni were added to the stirrer type reactor, the effect of various parameters such as temperature, pressure, catalyst dosage, and stirring speed were examined. The results indicated that the optimal reaction temperature was 160 °C at a maximal pressure (0.8 MPa), stirring speed (800 rpm). Furthermore, 2 g of 9-ECZ was used with Raney-Ni dosages of 0.2 and 1.0 g and the corresponding hydrogen uptake was 5.16 wt.% and 5.81 wt.%, respectively. Lastly, three cyclic experiments were conducted to investigate the reversibility of the hydrogenation and dehydrogenation of 9-ECZ at 180 °C.

Keywords

Dehydrogenation Hydrogenation Liquid organic hydrogen carrier Reversibility 9-ethylcarbazole 

Nomenclature

a, b

Arbitrary constants

Δm

Change in the mass of hydrogen gas

M

Mass of solution

n

No of moles of hydrogen gas

n0

Initial concentration of the gas

nf

Final concentration of the gas

P

Pressure of hydrogen gas

R

Ideal gas constant

T

Temperature of the reactor

V

Volume of hydrogen gas

wt.%

Weight percent of stored hydrogen gas

X

Volume of the bottle

Y

Output value of ultrasonic level transmitter

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Notes

Acknowledgments

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2018R1A2B6006160). This work was supported by Global Scholarship Program for Foreign Graduate Students at Kookmin University in Korea.

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Copyright information

© KSME & Springer 2019

Authors and Affiliations

  1. 1.School of Mechanical EngineeringKookmin UniversitySeoulKorea

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