Comparative Study between Regression and Soft Computing Models to Maximize the Methane Storage Capacity of Anthracite-Based Adsorbents

Abstract

Adsorbed natural gas (ANG) technology is a safe and low-cost approach for natural gas storage. Improving the volumetric adsorption capacity of adsorbents in the ANG tank can enhance the fuel density and make this technology cost-effective compared to other available CH4 storage approaches. For this purpose, the present research focuses on maximizing CH4 uptake on low-cost and available anthracite-based carbon materials via experimental and analytical investigations. The effect of preparation variables of the chemical agent (KOH) impregnation ratio to the anthracite (2.6–4.3 g/g), activation temperature (666–834 °C), and retention time (39–140 min) on the specifications of the coal-based activated carbons (ACs) and their CH4 adsorption capacity were examined experimentally. The results were analyzed through empirical models, including response surface methodology (RSM), our in-house developed models, namely, regularization networks (RN) and adaptive neuro-fuzzy interface systems. The statistical assessment revealed that all three established models could effectively predict the methane adsorption capacity of the carbon samples based on their preparation conditions. The superior performance of our in-house RN is dedicated to its robust theoretical backbone in the regularization theory. Finally, the carbon sample prepared under the optimized preparation conditions, based on the RSM and genetic algorithm, showed the highest CH4 uptake of 175 cm3 (STP)/cm3. Based on the authors’ knowledge, the volumetric CH4 capacity of the optimized AC is one of the highest values reported in the literature among different classes of the adsorbent.

Reliable prediction of n-heptane isomerization over Pt/(CrOx/ZrO2)-HMS via comparative assessment of regularization networks and surface response methodologies

“…† Positive marks in front of each term represent the synergistic effect and consequence to elevate in the corresponded responses, while negative signs indicate antagonistic effects and decrease the response. 33,45 The ANOVA results for tting the suggested model for entire responses are exhibited in Tables 4 and 5.…”

“…Statistical assessment accomplished by Mirzaei et al revealed that tuning the parameters of the RSM and ANN enables us to effectively predict methane adsorption capacity on the carbon active samples. 33 In the present study, collections of the Pt-Cr/Zr(x)-HMS catalysts with various Cr/Zr molar ratios were synthesized and utilized as solid acid catalysts for the catalytic isomerization of n-heptanes. In order to examine the catalyst performances, parameters such as activity and various forms of the selectivity including MOB (mono-branched) heptane, MUB (multibranched) heptane, i-C 7 (MOB + MUB), cracking (crack.…”

Gas‐phase catalytic isomerization of n‐heptane using Pt/(CrOx/ZrO2)‐HMS catalysts: A kinetic modeling

“…It has been proved that mathematical models are powerful tools for simulation and optimization of chemical reaction systems 25,26 . Among them, the statistical models would facilitate correlating operating parameters and provide a better view of the performance of the experimental processes.…”

Experimental and simulation study of the effect of surface functional groups decoration on CH4 and H2 storage capacity of microporous carbons

“…The activated carbons (ACs) were prepared by chemical activation of anthracite as the raw material. The chemical activation process was carried out according to the optimised activation conditions reported in our previous study [22] to maximise the CH4 storage capacity of the prepared adsorbents. The specific optimisation condition including chemical impregnation ratio, activation temperature and retention time were obtained via two different well-known methods of surface response methodology and genetic algorithm to be 3 g KOH/g anthracite, 730 • C and 60 min, respectively.…”

“…A custom-built volumetric adsorption measurement apparatus was used for the analysis of CH4 and H2 uptake on the prepared adsorbents at 298 K and pressure up to 40 bar. We have described the details of this sorption measurement system, calibration method and measurement procedure in our previous studies [22,25] and briefly in the Supplementary Information.…”