Hydrogen Adsorption Characteristics for Zeolite-Y Templated Carbon

Abstract

The hydrogen adsorption, kinetic and thermodynamic of adsorption onto the zeolite templated carbon (ZTC) were examined at the temperature range of 30-50 °C and ambient pressure. The ZTC was prepared from zeolite-Y template and sucrose carbon precursor by impregnation method and showed its specific surface area of 932 m2/g as well as 0.97 cm3/g for total pore volume. Analysis of physical and chemical characteristics for materials were performed using XRD, SEM, TEM and N2 isotherm. The results indicated that the ZTC has some ordered network structure of carbon and also exhibits the formation of carbon layer outside the zeolite micropore. We observed the ZTC for hydrogen adsorption both gravimetric and volumetric method up to 1.72 and 1.16 wt.% at the lowest temperature, respectively. The kinetic process at all studied temperature was best approximated by pseudo second order kinetic model. The aspects of thermodynamic such as heat of adsorption and the entropy change were -14.41 kJ/mol and -40.93 J/K mol, respectively. Both values was negative, indicating an exothermic reaction and low disorder at the hydrogen and ZTC interface, when the adsorption process took place. While, the enthalpy change value exhibits characteristic of physical process. The Gibbs energy change calculated at 30, 40 and 50 °C were -1.99, -1.59 and -1.19 kJ/mol, respectively, indicating a spontaneous adsorption process.

The utilization of micro-mesoporous carbon-based filler in the P84 hollow fibre membrane for gas separation

“…Previously, it was assumed that the difference in CO 2 and H 2 separation behaviour on this membrane was owing to filler characteristic toward permeating gas and filler position on the membrane surface. First of all, as described by Nishihara et al [ 36 ], ZTC was already widely used in the gas adsorption process involving H 2 [ 38 , 63 ], CO 2 [ 42 , 43 ] and CH 4 [ 36 , 64 ]. It was revealed that at ambient temperature and pressure, ZTC is more active toward CO 2 when compared with the H 2 and CH 4 [ 36 ].…”

“…As a result, making this material fits the required properties for the gas separation membrane. Previously, ZTC has decent CO 2 and H 2 adsorption capacity indicating good affinity towards the respective gas [ 37 , 38 ]. Thus, the gas flow behaviour needs to be controlled so that the adsorption of the stated gas can be avoided to improve the selectivity value.…”

Modulating the porosity of carbons for improved adsorption of hydrogen, carbon dioxide, and methane: a review

“…In fact since 2018 there exist only nine journal articles on the subject of capture/storage of these molecules in ZTCs. 14,[258][259][346][347][348][349][350][351] Furthermore, of these papers two are based on simulations of hypothetical optimized ZTCs. 259,346 While these provide insights into what an optimal ZTC structure might be for these applications, they do not provide novel methods for modulating ZTC porosity.…”

“…Wijiyanti et al produced a ZTC with moderate surface area (932 m 2 g À1 ) and pore volume (0.97 cm 3 g À1 ) with hierarchical porosity using sucrose dissolved in H 2 SO 4 , resulting in a material which allows rapid ingress of H 2 (at 30-50 1C and 1 bar) into the porous structure. 346 While the bulk of the literature has focused on using pristine carbon sources in synthesis of ZTCs, Musyoka et al found that a 'dirty' source, namely the pyrolysis gases from used tyres can be used as a CVD vapour (see Table 5). The vapour is composed primarily of small aromatic molecules.…”

Structure and Stability of Gas Adsorption Complexes in Periodic Porous Solids as Studied by VTIR Spectroscopy: An Overview

“…Gas adsorption (physisorption) in porous solids can be used in industrial processes such as oxygen (and argon) separation from air [1][2][3][4], sweetening of natural gas, upgrading of (landfill) biogas [5][6][7][8] and purification of hydrogen obtained from synthesis gas (syngas) or from steam reformation of hydrocarbons [9][10][11], to name only a few examples. Other (prospective) applications include post-combustion carbon dioxide capture from the flue gas of coal fired power stations [12][13][14][15], indoor air purification, e.g., in submarines and manned spacecraft [16][17][18][19], and the use of porous solids for (alternative) hydrogen or methane fuel storage and delivery in the transportation sector [20][21][22][23][24][25][26][27][28][29][30][31][32], including the advent of hydrogen fuelled drones and (possibly) airplanes [33][34][35][36]. For gas separation and purification the gas adsorbent units are frequently operated in a transient mode, which involves alternative gas adsorption-desorption cycles referred to as temperature swing (TSA) or pressure swing (PSA) adsorption, depending on the strategy used to regenerate the porous adsorbent [10,13].…”