Hydrogen adsorption and diffusion in synthetic Na-montmorillonites at high pressures and temperature

Adsorption studies of hydrogen and ethylene on cation-exchanged bentonite

“…Due to the different experimental conditions used, it is difficult to compare the results of experiments with H 2 adsorption data reported in the literature. Hydrogen adsorption by the K-B sample (0.522 mmol g −1 at 77 K) was comparable to that of montmorillonite (from Gador) calcined at 473 K for 4 h (∼0.5 mmol g −1 ) (Gil et al, 2007) and slightly less than that of intercalated montmorillonite (from Tsukinuno) calcined for 4 h at 473 K (Gil et al, 2009), Na-montmorillonite for H 2 adsorption at high pressures (up to 90 bar) and 363 K (Mondelli et al, 2015) and a Callovo-Oxfordian clay rock studied by Bardelli et al (2014). Experimental results indicated that ion exchange of B with aqueous solutions of KNO 3 , LiNO 3 , AgNO 3 and Mg(NO 3 ) 2 had a marked influence on H 2 gas adsorption.…”

“…A large number of studies has been carried out on the characterization of the ion-exchanged bentonites (Adams, 1987;Komadel et al, 1990;Cases et al, 1997;Rutherford et al, 1997;Lee et al, 1999;Xu et al, 2000;Jozefaciuk & Bowanko, 2002;Yıldız & Çalımlı, 2002;Neaman et al, 2003;Huang et al, 2004;Volzone & Ortiga, 2004;Çaglar et al, 2009). Information is scarce, however, about the adsorption of ethylene (Choundry et al, 2002;Park et al, 2002;Cho et al, 2005;Saini et al, 2011;Erdogȃn Alver & Sakızcı, 2012;Youngjan, 2012;Erdogȃn Alver et al, 2016) and hydrogen (Gil et al, 2007(Gil et al, , 2009Didier, 2012;Bardelli et al, 2014;Edge, 2015;Mondelli et al, 2015) by clay and clay-based materials. Furthermore, very few publications are available in the literature that discuss the ethylene and hydrogen adsorption properties of K, Na-, Li-, Ag-and Mgmodified bentonites from Turkey.…”

Dynamics studied by Quasielastic Neutron Scattering (QENS)

“…Copyright 2006 Elsevier and pressures of importance is crucial for the estimation of hydrogen leakage rates and thus for assessment of the overall performance, safety and efficiency of storage facilities. Adsorption and diffusion of hydrogen gas was investigated in model smectite at high pressure by QENS and volumetric techniques at the temperature and pressure of practical interest [44]. In particular, QENS revealed that hydrogen diffuses inside the clay porous network according to Fick's law (continuous diffusion), while jump diffusion cannot be excluded at distances lower than 6.3 Å, i.e.…”

Selection of Underground Hydrogen Storage Risk Assessment Techniques

“…Dissolution of minerals in reservoir rock may increase its porosity and permeability [24] and lead to weakening of its mechanical strength or activation of faults [20,25]. Hydrogen can also act on sealing rocks, dissolution of minerals and sorption/desorption of clay minerals in these rocks, creating gas migration pathways through the overburden [20,[26][27][28].…”