Adsorption studies of hydrogen and ethylene on cation-exchanged bentonite

Abstract

The adsorption of C2H4 and H2 gases by bentonite from the Ünye region, Turkey both as raw (B) and as K+-, Li+-, Ag+- and Mg2+ -exchanged forms, was investigated using automated volumetric equipment and pressures up to 100 kPa at 273 K and 77 K, respectively. X-ray powder diffraction (XRD) and specific surface area measurement (BET) methods were employed to characterize the bentonite samples. The C2H4 and H2 gas adsorption capacities of the original and modified forms were in the ranges 1.817–0.201 mmol g−1 and 0.522–0.388 mmol g−1, respectively. The influence of salt modifications on the gas adsorption properties of bentonite is discussed.

Kaolinit kilinin hidrojen depolama amaçlı kullanımı için modifikasyonu ve karakterizasyonu

“…Hidrojen yakıtlı ekonomiyi gerçeğe dönüştürmede, hidrojenin geleceğini engelleyen depolama sorunlarının üstesinden gelinmelidir. Hidrojenin yakıt olarak kullanılabilmesi için çeşitli malzemelerde güvenli ve uygun fiyatlı bir şekilde depolanması için yapılan çalışmalar son zamanlarda büyük ilgi görmektedir [8]. Sıkıştırılmış gaz, sıvılaştırma, metal hidrürler hidrojeni depolamak için kullanılan yaklaşımlar arasındadır, ancak yine de boyut, verimlilik, maliyet ve araç içi güvenlik kriterlerini karşılamamışlardır [9,10].…”

Influence of acid activation on the NH3-adsorption properties of a Turkish bentonite

“…Clay and clay minerals have proven to be good candidates in the context of pollution control. They have the ability to adsorb radionuclides (Krupskaya et al, 2017), heavy metal ions (Ma et al, 2016), dyes (Gök et al, 2010), gases and volatile compounds (Volzone & Ortiga, 2009;Chen & Lu, 2015; Erdoğan Mucha et al, 2017;Erdoğan Alver, 2017). Bentonites can be described as the clay minarals which are substantially bearing smectite minerals (Fontaine et al, 2020).…”

Sepiolite as an efficient adsorbent for ethylene gas

“…In addition to the abundance of sepiolite reserves in Sivrihisar region, its large specific surface area due to the molecular-sized channels is the main reason for choosing this low-cost material in this study. Previous studies have investigated ethylene adsorption on clay-based materials (Choundary et al 2002;Park et al 2002;Park et al 2004;Cho et al 2005;Lee et al 2005;Saini et al 2011;Youngjan, 2012;Gwak et al 2017;Srithammaraj et al 2018;Alvarez-Hernandez et al 2018;Gaikwad et al 2019), acid-treated sepiolite, kaolinite and bentonite (Erdoğan Alver & Sakızcı, 2012;, and Ag + -, K + -, Li + -, Mg 2+ -, Cu 2+ -and Fe 3+ -e c an ed enton te (Erdoğan Alver, 201 ;.…”

“…In addition to the abundance of sepiolite reserves in the Sivrihisar region, the large specific surface area of this sepiolite due to its molecular-sized channels is the main reason for choosing this low-cost material for this study. Previous studies of ethylene adsorption by clay-based materials (Choundary et al, 2002;Park et al, 2002Park et al, , 2004Cho et al, 2005;Lee et al, 2005;Saini et al, 2011;Youngjan, 2012;Gwak et al, 2017;Alvarez-Hernandez et al, 2018;Srithammaraj et al, 2018;Gaikwad et al, 2019), acid-treated sepiolite, kaolinite and bentonite (Erdoğan Alver & Sakızcı, 2012; and Ag + -, K + -, Li + -, Mg 2+ -, Cu 2+ -and Fe 3+ -exchanged bentonites (Erdoğan Erdoğan Alver, 2017) did not examine ethylene adsorption on various cation-exchanged forms of sepiolite. The novelty of this study is in its comparison of the ethylene adsorption properties of sepiolite samples after both cation exchange and acid activation and in its determination of the most suitable type of sepiolite for optimum adsorption.…”