{"id":3933,"date":"2024-05-01T18:37:08","date_gmt":"2024-05-01T18:37:08","guid":{"rendered":"http:\/\/121.199.166.88\/?post_type=resources&#038;p=3933"},"modified":"2024-11-25T14:38:35","modified_gmt":"2024-11-25T14:38:35","slug":"introduction-to-ideal-adsorbed-solution-theory-in-microactivepredicting-multicomponent-adsorption","status":"publish","type":"resources","link":"https:\/\/micromeritics.com.cn\/en\/resources\/introduction-to-ideal-adsorbed-solution-theory-in-microactivepredicting-multicomponent-adsorption\/","title":{"rendered":"Introduction To Ideal Adsorbed Solution Theory In Microactive:Predicting Multicomponent Adsorption"},"content":{"rendered":"\n<p><strong>Introduction<\/strong><br>With the release of the MicroActive V6.0 and the 3Flex V6.0 software, multicomponentadsorption predictions using ideal adsorbed solution theory (IAST) have been added. IAST is apredictive technique developed by Myers and Prausnitz in 1965. It is used to predict mixed gasadsorption behavior from single component isotherms. This first release of IAST on V6.0 canbe used to predict binary adsorption. IAST has proven to be in good agreement for a variety ofbinary systems, including methane\/ethane mixtures in BPL carbon, Xe\/Kr mixtures in zeoliteNaA, and propane\/propylene mixtures in HKUST-1 (Furmaniak, et. al., pccp, 2015).<\/p>\n\n\n\n<p>IAST relies on several assumptions that are described in the original manuscript, which are listed<br>below (Myers, Prausnitz, AIChE Journal, 1965).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The surface of the adsorbent is heterogeneous. Homogeneous surfaces are likely to deviate from ideal behavior.<\/li>\n\n\n\n<li>The adsorbents are non-reactive and similar in size\/shape to each other.<\/li>\n\n\n\n<li>Pure-component isotherms must be accurately measured at low surface coverage, because the integration for spreading pressure is sensitive to this portion of the pure-component isotherm.<\/li>\n<\/ul>\n\n\n\n<p><strong>Experimental<\/strong><br>IAST calculations can be performed in MicroActive by selecting Reports then OpenNotebook. If creating a new notebook, enter a name and press Open. The system will displaya prompt that the chosen file name does not exist and ask whether to create that file. Afterproceeding with the file creation, the report selection screen will appear where IAST CompositionReports can be selected to open the IAST report template. On the IAST reporting window, up totwo isotherms for IAST can be selected. The following isotherm models are also available: VTTE,Sips, Langmuir, Dual Site Langmuir, Toth, and Redlich Peterson. Choose the appropriate model,click Save, then press Preview to generate the report.In this note, three microporous carbons were selected for demonstrating the new IAST featuresin MicroActive. The three carbons used in this study include: Carboxen 1018, Carboxen 1021, andCarbosieve S-III. The samples were each analyzed on the 3Flex for CO2, CH4, and C2H6 adsorption.Prior to analysis, samples were activated on a SmartVac Prep by heating to 250 \u00b0C under vacuumfor 10 hours. Following activation, the samples were analyzed for each gas.Breakthrough analyses were conducted on the Micromeritics BTA. Samples were activatedunder nitrogen flow while heating to 250 \u00b0C overnight. Binary breakthrough measurementswere conducted using a mixed gas feed consisting of 50:50 mixtures of CO2-CH4, CO2-C2H6, andCH4-C2H6. Nitrogen was used as a carrier gas and argon was used as a tracer gas to determinethe start of the breakthrough experiment<\/p>\n\n\n\n<p><strong>Results<\/strong> <br><strong>Single Component Analysis using the 3Flex<\/strong><br>The results of the single component isotherms for the three materials: Carboxen 1018, Carboxen1021, and Carbosieve S-III are shown in Figures 1, 2, and 3 below.<\/p>\n\n\n\n<p>The results for Carboxen 1018 are shown in Figure 1. Ethane showed strong affinity at low pressure, but less capacity than CO<sub>2<\/sub> at 1000 mbar. At 1000 mbar, the adsorption capacity of CO<sub>2<\/sub> was 55 cm<sup>3<\/sup>\/g STP, while ethane reached a capacity of 40 cm<sup>3<\/sup>\/g STP. Methane was the weakest adsorbing species, reaching a capacity of 15 cm<sup>3<\/sup>\/g STP.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"727\" height=\"332\" src=\"https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/06\/ideal-adsorbed-solution-figure-1.jpg\" alt=\"\" class=\"wp-image-4521\" srcset=\"https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/06\/ideal-adsorbed-solution-figure-1.jpg 727w, https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/06\/ideal-adsorbed-solution-figure-1-300x137.jpg 300w\" sizes=\"(max-width: 727px) 100vw, 727px\" \/><figcaption class=\"wp-element-caption\"><br><strong>Figure 1.<\/strong> Single component isotherms of Carboxen 1018 for CO<sub>2<\/sub> (orange), CH<sub>4<\/sub> (blue), and C<sub>2<\/sub>H<sub>6<\/sub> (green)<\/figcaption><\/figure>\n<\/div>\n\n\n<p>Carboxen 1021 displayed a similar trend compared to Carboxen 1018; however, the adsorbedcapacity at 1000 mbar was similar between ethane (58 cm<sup>3<\/sup>\/g STP) and CO<sub>2<\/sub> (55 cm<sup>3<\/sup>\/g STP). Onceagain, methane adsorption was the lowest at 1000 mbar, reaching only 24 cm<sup>3<\/sup>\/g STP.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"726\" height=\"332\" src=\"https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/06\/ideal-adsorbed-solution-figure-2-1.jpg\" alt=\"\" class=\"wp-image-4526\" srcset=\"https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/06\/ideal-adsorbed-solution-figure-2-1.jpg 726w, https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/06\/ideal-adsorbed-solution-figure-2-1-300x137.jpg 300w\" sizes=\"(max-width: 726px) 100vw, 726px\" \/><figcaption class=\"wp-element-caption\"><br><strong>Figure 2<\/strong>. Single component isotherms of Carboxen 1021 for CO<sub>2<\/sub> (orange), CH<sub>4<\/sub> (blue), and C<sub>2<\/sub>H<sub>6<\/sub> (green)<\/figcaption><\/figure>\n<\/div>\n\n\n<p>Carbosieve S-III showed the strongest affinity for ethane, reaching an adsorbed capacity of 90 cm<sup>3<\/sup>\/g STP at 1000 mbar. CO<sub>2<\/sub> adsorbed the second most (74 cm<sup>3<\/sup>\/g STP), followed by methane (33 cm<sup>3<\/sup>\/g STP).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>IntroductionWith the release of the MicroActive V6.0 and the 3Flex V6.0 software, multicomponentadsorption predictions using ideal adsorbed solution theory (IAST) have been added. IAST is apredictive technique developed by Myers and Prausnitz in 1965. It is used to predict mixed gasadsorption behavior from single component isotherms. This first release of IAST on V6.0 canbe used [&hellip;]<\/p>\n","protected":false},"featured_media":5668,"parent":0,"template":"","meta":{"_acf_changed":true},"methods":[207],"resource_type":[8],"class_list":["post-3933","resources","type-resources","status-publish","has-post-thumbnail","hentry","methods-gas-adsorption","resource_type-application-notes"],"acf":[],"_links":{"self":[{"href":"https:\/\/micromeritics.com.cn\/en\/wp-json\/wp\/v2\/resources\/3933","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/micromeritics.com.cn\/en\/wp-json\/wp\/v2\/resources"}],"about":[{"href":"https:\/\/micromeritics.com.cn\/en\/wp-json\/wp\/v2\/types\/resources"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/micromeritics.com.cn\/en\/wp-json\/wp\/v2\/media\/5668"}],"wp:attachment":[{"href":"https:\/\/micromeritics.com.cn\/en\/wp-json\/wp\/v2\/media?parent=3933"}],"wp:term":[{"taxonomy":"methods","embeddable":true,"href":"https:\/\/micromeritics.com.cn\/en\/wp-json\/wp\/v2\/methods?post=3933"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/micromeritics.com.cn\/en\/wp-json\/wp\/v2\/resource_type?post=3933"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}