N2 adsorption

Author Mira Dobreva. Published 10th August The gas separation process in PSA N2 generators is based on the ability to fix various gas mixture components and particles by a physical solid substance, n2 adsorption.

Federal government websites often end in. The site is secure. A new synthesis method based on a self-activation technique was developed for a new green porous carbon adsorbent. This ecofriendly system was used for the synthesis of hierarchical porous carbons from walnut-shell precursors. The sorbent was successfully synthesized by facile one-step carbonization, with the activating reagents being gases released during the activation. The sample morphology and structure were characterized by field emission scanning electron microscopy, high-resolution transmission electron microscopy, Raman, Fourier transform infrared spectra, X-ray photoelectron spectroscopy, X-ray powder diffraction, thermogravimetric, and differential thermal analysis. Finally, the technology described presents a promising strategy for producing eco-friendly porous carbon from a variety of biomass on an industrial scale.

N2 adsorption

The equilibrium data for N 2 was fit using four isotherm schemes: two single site Langmuir isotherms, the DSL with the equal energy sites and the DSL with unequal energy site pairings. The adsorption breakthrough experiments were able to provide accurate data for CO 2 competitive adsorption, while failing to provide reliable N 2 data. It was shown that desorption experiments from a bed fully saturated with the desired composition provides a better estimate of the competitive N 2 loading. A detailed mathematical model that used inputs from the batch equilibrium experiments was able to predict the composition and thermal breakthrough curves well while underpredicting the single component N 2 loading. The DSL isotherm with unequal energy sites was shown to predict the competitive loading and breakthrough curves well. The impact of the chosen adsorption isotherm model on process performance was evaluated by simulating a 4-step vacuum swing adsorption process to concentrate CO 2 from dry post-combustion flue gas. The results show that the purity, recovery, energy and productivity are affected by the choice of the competitive adsorption isotherm. This is a preview of subscription content, log in via an institution to check access. Rent this article via DeepDyve. Institutional subscriptions.

Rajagopalan, A.

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. This is a preview of subscription content, access via your institution. The supplementary materials contain complete experimental and spectral details for all new compounds reported herein. The CCDC numbers for the activated structure and for the N 2 -dosed structure are and , respectively.

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. Ammonia NH 3 is pivotal to the fertilizer industry and one of the most commonly produced chemicals 1. The direct use of atmospheric nitrogen N 2 had been challenging, owing to its large bond energy kilojoules per mole 2 , 3 , until the development of the Haber—Bosch process. These include using alkali and alkaline earth metal oxides as promoters to boost the performance of traditional iron- and ruthenium-based catalysts 4 , 5 , 6 via electron transfer from the promoters to the antibonding bonds of N 2 through transition metals 7 , 8. An electride support further lowers the activation barrier because its low work function and high electron density enhance electron transfer to transition metals 9 , This strategy has facilitated ammonia synthesis from N 2 dissociation 11 and enabled catalytic operation under mild conditions; however, it requires the use of ruthenium, which is expensive.

N2 adsorption

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Anyone you share the following link with will be able to read this content:. Barcia P. Turhan Y. Farmahini, A. Bourlinos A. Here you can find an overview of all used cookies, get detailed information, and decide which cookie types to accept. In semi-scale and industrial processes, the new approach reflects a promising technique for preparing the green porous carbon from biomass wastes. Dominique C. AIChE J. Energy Inst. I accept all cookies including US-providers Back. Krypton at 77 K is exclusively used for surface area assessment. Second, the micropore filling step utilizing Ar at 87 K shifts to higher relative pressures than N 2 at 77 K illustrated in Figure 3.

In the past few years, nanotechnology research has expanded out of the chemistry department and into the fields of medicine, energy, aerospace and even computing and information technology. With bulk materials, the surface area to volume is insignificant in relation to the number of atoms in the bulk, however when the particles are only 1 to nm across, different properties begin to arise. For example, commercial grade zinc oxide has a surface area range of 2.

Published 10th August Sandler S. Regala T. Yumak T. Chi C. Haghpanah, R. Furthermore, it can be seen that the size distribution of the pores, as critical factors determining its applicability, occurred randomly at the sample surface. Azuara M. The Van't Hoff equation was used through equations eqn 11 and Received : 31 May Ethics declarations Competing interests The authors declare the following competing interests: J.