Research Papers

Finding of Optimum Effective Parameters on Sweetening of Methane Gas by Zinc Oxide Nanoparticles

[+] Author and Article Information
Farshad Farahbod

Department of Chemical Engineering,
Firoozabad Branch,
Islamic Azad University,
P.O. Box 74715-117,
Firoozabad, Fars, Iran
e-mail: mf_fche@iauf.ac.ir

Sara Farahmand

School of Chemical and Petroleum Engineering,
Shiraz, Iran
e-mail: sfarahmand2005@gmail.com

Mohammad Jafar Soltanian Fard

e-mail: soltanianfardm.j@gmail.com

Mohammad Nikkhahi

e-mail: nikkhahi92@gmail.com
Department of Chemical Engineering,
Firoozabad Branch,
Islamic Azad University,
Firoozabad, Fars, Iran

1Corresponding author.

Manuscript received July 8, 2013; final manuscript received September 13, 2013; published online October 7, 2013. Assoc. Editor: Roger Narayan.

J. Nanotechnol. Eng. Med 4(2), 021003 (Oct 07, 2013) (6 pages) Paper No: NANO-13-1040; doi: 10.1115/1.4025467 History: Received July 08, 2013; Revised September 13, 2013

Nanocatalysts are adapted in this research to remove H2S as the toxic, corrosive, and pyrophoric contaminant. The important feature which is considered is to enhance the adsorption efficiency of hydrogen sulfide from hydrocarbon fuels such as methane gas by applying the zinc oxide nanocatalyst. In general, the optimum conditions to eliminate the hydrogen sulfide from methane gas are evaluated in this paper, experimentally. In this study, zinc oxide nanoparticles are synthesized and are contacted with flow of sour methane. The synthesized nanoparticles are characterized by SEM. The process performance of H2S removal from methane gas on zinc oxide nanoparticles is illustrated by the ratio of outlet concentration per feed concentration. The effects of operating conditions such as operating temperature, pressure, the occupied volume of bed, the amount of H2S concentration in feed stream, feed superficial velocity, size of nanocatalyst, and the bed height are studied in this paper. Also, the cost estimations are presented for different operating pressures and temperatures. This work studies the adsorption of H2S from natural gas with an emphasis on the influence of the operating parameters on process efficiency and cost evaluation. Finally, results introduce the amount of pressure 15 atm, temperature 300 °C, bed height 70 cm, and 35 nm in diameter nano zinc oxide as the optimum properties. Therefore, the amount of C/C0 is decreased to 0.022. In addition, this is confirmed that the increase in the feed concentration of H2S and feed superficial velocity, also the decrease in the diameter of zinc oxide catalyst enhances the process efficiency.

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Fig. 1

(a) SEM photographs of zinc oxide nanoparticles on 5 μm scales and (b) SEM photographs of zinc oxide nanoparticles on 500 nm scales

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Fig. 2

The experimental set up to remove hydrogen sulfide by nano zinc oxide

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Fig. 3

The effect of pressure and temperature on H2S removal for 35 nm in diameter catalysts

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Fig. 4

(a) Process performance versus the operating temperature. (b) The process performance and price of steam production versus the operating temperatures for 35 nm in diameter catalysts.

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Fig. 5

(a) The process performance versus the operating pressure. (b) The process performance and reactor vessel cost versus the operating pressures for 35 nm in diameter catalysts.

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Fig. 6

The process performance versus the feed superficial velocity

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Fig. 7

The effect of zinc oxide bed height on the adsorption performance

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Fig. 8

The effect of catalyst volume on the process performance

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Fig. 9

The effect of initial concentration of H2S on the process performance

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Fig. 10

The adsorption performance due to the various diameters of the zinc oxide

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Fig. 11

The effect of catalyst surface is on the process performance



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