Acid base interaction and its influence on the adsorption kinetics and selectivity order of aromatic sulfur heterocycles adsorbing on Ag-Al2O3

Mesoporous TiO2–SiO2 adsorbent for ultra-deep desulfurization of organic-S at room temperature and atmospheric pressure

“…ADS can be carried out at atmospheric pressure and room temperature, without consumption of hydrogen. 3,[16][17][18] Various high performance materials have been reported as adsorbents for adsorptive desulfurization of fuels. The most commonly-used adsorbents include activated carbons, [19][20][21] zeolites, [22][23][24] ionic liquids, [25][26][27] metal oxides [28][29][30] and other mesoporous materials.…”

Nano-silver functionalized spherical activated carbon with enhanced dipropyl sulfide adsorption capacity and antibacterial properties

“…In the process of S–Ag interaction, the π-lone pair electrons of sulfur atoms combine with silver ions to form an interaction. 41 In addition, AgNO 3 impregnation increased the surface acidity of Ag-SAC. According to the HSAB theory, the hard acidic sites of Ag-SAC can interact with the σ-lone pair electrons of S atom, which will form S–H enhance the adsorption of DPS.…”

“…The second stage is the gradual adsorption stage where intra-particle diffusion became the main factor affecting the adsorption rate. 41 In this second stage, the pore volume of Ag-SAC became the most important determining element of adsorption capacity. As shown in Fig.…”

“…9, the chemical adsorption mechanism mainly involves the direct interaction between silver cation and sulfur atom (S-Ag) and the interaction between hard acid and hard base (S-H). 41 According to the HSAB theory, whether stable interaction can be formed between acids and bases is determined by their hardness. DPS is a kind of Lewis base organic sulde, 41,46 and the sulfur atoms of DPS have two pairs of lone electrons: a p-lone pair electron and a s-lone pair electron.…”

“…41 According to the HSAB theory, whether stable interaction can be formed between acids and bases is determined by their hardness. DPS is a kind of Lewis base organic sulde, 41,46 and the sulfur atoms of DPS have two pairs of lone electrons: a p-lone pair electron and a s-lone pair electron. 47 This electron conguration of DPS means that it can act as a hard or so base.…”