Abstract
Abstract The purpose of this work is to study the application of nano-molybdenum oxide adsorbent in gas sweetening process. Experiments were made to evaluate the operating and geometrical parameters in the adsorption process. The process performance of H2S removal from methane gas on molybdenum oxide nanoparticles was defined as the ratio of final concentration of H2S on the initial concentration of H2S. The effects of operating conditions such as operating temperature, pressure, the size of nanoparticles, the amount of H2S concentration in feed stream, feed superficial velocity, and the bed length were studied in this paper. Different temperature values (65, 75, 85, 87 and 89 °C) and pressure values (10, 13, 16 and 19 bar) were applied on the adsorption bed with 19 cm length and 10 cm diameter. Two types of spherical and cylindrical nanoparticles were applied and the effect of different adsorbents diameters (54, 58, 73, 77 and 83 nm) on the process quality (C/C 0 ) was investigated. Also, the effect of initial concentration of H2S in the feed gas stream was surveyed. The optimum operating conditions for spherical and cylindrical types were the same, 16 bar and 85 °C. The adsorption capacity of 0.22 g H2S/g MoO2 and 0.19 g H2S/g MoO2 was achieved at the optimum conditions using nano-spherical and nano-cylindrical MoO2 sorbent, respectively. Applying in our study two adsorption isotherms, the Langmuir and Freundlich isotherms, analysis of variance displayed a high coefficient of determination (R2) value of 0.989 for the Freundlich isotherm, indicating the satisfactory adjustment of the experimental data. The results can be interesting for related industries and can be applicable in process optimization.
Highlights
The natural gas (NG) extracted from independent gas wells usually contains a large percentage of methane gas, some quantity of ethane and a little quantity of other alkanes and small amount of impurities such as carbon dioxide (CO2), nitrogen, hydrogen sulfide (H2S) etc. (Mandal et al 2004; Alie et al 2005)
Hydrogen sulfide is a familiar impurity in natural gas streams, coal gas and chemical feed stocks (Niu et al 2012; Rao et al 2012; Zhang et al 2013)
Researchers have turned to solid metal oxide adsorbents and some studies have found that sulfur adsorption works best at the surface of solid metal oxides (Balouria et al 2013)
Summary
The natural gas (NG) extracted from independent gas wells usually contains a large percentage of methane gas, some quantity of ethane and a little quantity of other alkanes and small amount of impurities such as carbon dioxide (CO2), nitrogen, hydrogen sulfide (H2S) etc. (Mandal et al 2004; Alie et al 2005). Ideas for sour gas, oil and flue gas desulfurization were established in England around 1850 (Niu et al 2012), one of the most well-known of which is absorption In this process, sulfur compounds are removed using a liquid treatment that absorbs the sulfur from natural gas, but this process is cumbersome and requires that the gas be cooled and reheated (Wu et al 2003). The solution seemed to be tiny grains of metal oxide nanoparticles, uniting high surface area, high reactivity, and structural integrity in a high-performance sulfur compounds adsorbent Nanoparticles such as metal oxides can promote the heating and cooling process. The nanosubstances can enhance the thermal stability of some of materials (Novochimskii et al 2004; Habibi et al 2009)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
