Dynamic catalytic adsorptive desulfurization of real diesel over ultra‐stable and low‐cost silica gel‐supported TiO₂

Abstract

To develop dynamic ultra-deep catalytic adsorptive desulfurization (CADS) of real diesel using ultra-stable and lowcost silica gel-supported TiO 2 is the aim of the work. A two-stage dynamic breakthrough model was built to describe the CADS process, varied with H/R ratio and O/S ratio. The desulfurization capacity reached 1.3 mg-S/g-A at the breakthrough concentration of 5 ppm-S. Various types of silica gel were screened as the substrate for TiO 2 , and the textural/ acidic properties and CADS capacity were correlated in high relevancy. The effectiveness of diverse oxidants on CADS and the oxidation path were elucidated via combined experiment/simulation. Adsorption enthalpy derived from fitted isotherm data was calculated as 33.4 kJ/mol. The TiO 2 /silica gel-based sorbent demonstrated remarkable recyclability/ stability in 10 cycles. An effective and economic route to eliminate the trace amount of stubborn sulfur compounds in low-sulfur diesel is provided, which can be potentially implemented as the final polishing step for ultra-clean diesel production.

Kinetics of Sulfur Removal from Tehran Vehicular Gasoline by g-C3N4/SnO2 Nanocomposite

“…The desulfurization value obtained in this research for the local commercial gasoline, which contained diverse aromatic hydrocarbons, was the highest amount achieved so far. Previous researchers had obtained a relatively low value of 3.5 mg S g –1 by graphenelike boron nitride, 26 2.18 mg S g –1 by the Ni/SiO 2 -Al 2 O 3 adsorbent and 1.57 mg S g –1 by activated alumina, 47 0.32 mg S g –1 by zeolite as an adsorbent, 27 1.2 mg S g –1 by 15%TiO 2 /C–SiO 2 , 48 and 7.3 mg S g –1 by utilization of 55 wt % metallic Ni with silica–alumina as support of the adsorbent. 49 The authors focused on the removal of sulfur from the DBT because it was the highest sulfur-containing compound of the selected gasoline.…”

Selective Removal of Organonitrogen Compounds in Fuel using Functional Polybenzimidazole Nanofibres: A Combined Experimental and Theoretical Study

“…12). 35 Negative Gibb's free energies observed in all interactions (quinoline-PBI, pyrimidine-PBI and carbazole-PBI), indicate exothermic processes (Table 7). Based on the obtained enthalpy (DH b ) values, pyrimidine-PBI offers a better interaction as compared to quinoline-PBI and carbazole-PBI ( Table 7).…”

Aerobic oxidative desulfurization via magnetic mesoporous silica-supported tungsten oxide catalysts

“…To overcome these drawbacks, it is necessary to develop alternative desulfurization technologies. Several desulfurization technologies have been developed, such as extractive desulfurization (EDS) (Wang et al 2020;Song et al 2017), adsorptive desulfurization (ADS) (Luo et al 2019) and oxidative desulfurization (ODS) (Sun et al 2004;Wu et al 2017;Xun et al 2016;Shi et al 2017;Ren et al 2018;Hao et al 2017;Jiang et al 2019a, b, c, d). Among them, ODS is one of the promising desulfurization approaches because refractory sulfur components could be easily removed with ODS under mild conditions (Bryzhin et al 2019;Bhadra and Jhung 2019).…”