Adsorption and separation of light alkane hydrocarbons by porous hexacyanocobaltates (III)

Abstract

The adsorption and separation of light n-alkane hydrocarbons (propane, butane, pentane, hexane and heptane) by zinc and cadmium hexacyanocobaltates (III) were studied from inverse gas chromatographic data. These two solids are representative of the porous frameworks found for transition metals hexacyanometallates. For cadmium, the porous framework is related to the presence of systematic vacancies for the building block, [Co(CN) 6 ], while for Zn it is a consequence of a tetrahedral coordination for the Zn atom. These linear light hydrocarbons (paraffins) are effectively separated by these two porous frameworks. The involved differential adsorption heats and the related separation coefficients were estimated from the recorded chromatographic data. No significant differences for the separation ability of light n-alkane hydrocarbons by the evaluated materials were observed.

Separation of N–C5H12–C9H20 Paraffins Using Boehmite by Inverse Gas Chromatography

“…An important experimental feature is the low column temperature necessary to separate n-paraffins (C5-C9). As reported in previous studies, the separation of n-C3-n-C7 mixtures in hexacyanocobaltates [18], n-C3-n-C9 mixtures in clinoptilolite [19] and n-paraffins and aromatics in zeolites, elution temperatures above 127 • C were required [40]. Instead, the separation of n-C5-n-C9 mixtures in a larger boehmite column (90 cm) was achieved at elution temperatures below 77 • C. These data were a first indication that the non-specific interactions between n-paraffins and boehmite were lower than those present in the other two adsorbents.…”

“…This technique is able to make the study at several carrier gas flows and temperatures. It provides information about the interactions between gases and vapors with solid surfaces as diverse as alumina [13], chromia [14,15], polymer fabrics [16], biopolymers [17], nanomaterials [12], hexacyanocobaltates [18], zeolites [19]. The possible use of a Cuban mineral, in its natural and modified state, for the separation of hydrocarbons components and C5-C9 n-paraffin mixture has been studied too [20,21].…”

Zinc-modulated Fe–Co Prussian blue analogues with well-controlled morphologies for the efficient sorption of cesium

“…Zn-Co PBA is a 3D double metal cyanide with an excellent catalytic performance in ring-opening polymerization reactions and the adsorption of organic pollutants. [32][33][34][35][36] However, its application in Cs sorption requires further investigation.…”

Light N-Paraffins Separation by Inverse Gas Chromatography With Cuban Volcanic Glass

“…The most attractive aspect of the IGC is the effective application to a wide range of physicochemical characterization of non-volatile materials such as dispersive and specific parameters of surface free energy, diffusion coefficient, phase transitions and crystallinity (Voelkel et al, 2009;Mohammadi-Jan and Waters, 2014), which can yield vital information in the fields of polymer and coatings (Edelman and Fradet, 1989;Murakami et al, 1998;Abel et al, 2002), pharmaceuticals (Grimsey et al, 2002;Planinsek and Buckton, 2003;Mohammadi-Jan and Waters, 2014) fibers (Cantergiani and Benczédi, 2002;Heng et al, 2007) or nanomaterials (Batko and Voelkel, 2007;Menzel et al, 2009). Basing on the physicochemical properties of the material introduced on the packed column, IGC can be used for the separation of paraffins, as was reported by Autie et al in previous researches using porous hexacyanocobaltates (Autié-Castro et al, 2009), metal-organic framework (Cu-BTC and Fe-BTC) or natural clinoptilolite (Rivera et al, 2011). In the present work, a packed column with inexpensive volcanic glass has been used to evaluate the separation capacity of this structure for C 5 -C 9 paraffin mixtures as well as their adsorption heats by IGC.…”