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RISS 인기검색어
- 검색키워드
- 저자 : Mahdi Niknam Shahrak (검색결과 2 건)
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Reliable modeling of discharge process for adsorbed natural gas storage tanks
Mahdi Khorashadizadeh,Akbar Shahsavand,Mahdi Niknam Shahrak 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.11
Natural gas consumption has doubled in the last fifteen years. Among all storage techniques, adsorbednatural gas (ANG) provides a reliable vehicle for safe utilization of natural gas. Despite all favorable characteristicsof the ANG process, thermal adverse effects during charge and discharge processes are the most challenging issuesfacing adsorbed natural gas applications, especially for automotive usage. Mathematical modeling of an ANG tankcan provide a reliable method to analyze and solve such problems. A robust and lumped model is presented to mimicthe discharge process of an ANG tank storing pure component. The proposed model is very convenient compared toother available conventional models that require extensive computational efforts. Two experimental measurements andtwo simulation data sets (borrowed from literature) are recruited to validate the model predictions. The simulation resultsindicate proper agreement between the proposed model predictions and the validation data.
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New MOF-Based Corrosion Inhibitor for Carbon Steel in Acidic Media
Sakineh Zafari,Mahdi Niknam Shahrak,Mahboube Ghahramaninezhad 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.1
In this research, we present a novel class of metal–organic framework-based corrosion inhibitor materials named as zeoliticimidazolate framework-8@{Mo132} (ZIF-8@{Mo132}) nano-structure as an efficient and green inhibitor in HCl solution. Tothis purpose, ZIF-8@{Mo132} nano-structure is prepared via a convenient and excellent interaction of {Mo132} and ZIF-8surface using a versatile recipe. Afterward, the application of the mentioned organometallic nano-structure as a corrosioninhibitor for carbon steel in HCl solution was evaluated and was compared with pristine ZIF-8 performance. In this sense,surface observation, electrochemical impedance spectroscopy and polarization resistance were applied to study inhibitoryaction of both ZIF-8 and ZIF-8@{Mo132}. Full factorial design of the experiments was also implemented to investigate thereal operating variables including inhibitor concentration, immersion time and temperature affecting the inhibition efficiency(%IE). The obtained ANOVA analyses indicated that temperature is not very significant and effective parameter on inhibitionefficiency for both inhibitors. On the other hand, the thermodynamic study revealed that chemisorption occurs duringZIF-8@{Mo132} adsorption on the metal surface due to the high tendency of anionic ZIF-8@{Mo132} inhibitor to absorbover steel surface. This observation was also confirmed by AFM and SEM images taken from the steel surface. It is alsofound that ZIF-8@{Mo132} nano-structure demonstrated high activity as an effective corrosion inhibitor in HCl solution.
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