Enhanced Adsorption Desulfurization Performance over Mesoporous ZSM-5 by Alkali Treatment

Abstract

The adsorption sulfur capacity and selectivity are two key challenges for adsorption desulfurization technology of FCC gasoline. In order to improve the above issues, the mesopores were first introduced into ZSM-5 zeolites by a NaOH alkali treatment method to reduce the diffusion limitations and increase the sulfur capacity, in which the effects of the alkali concentration, treatment time, and temperature on the pore properties of zeolites were well discussed. The desulfurization performance was tested in a fixed-bed reactor using model fuel. The results demonstrated that the alkali treatment time was the most influential factor for the sulfur capacity. The mesoporous ZSM-5 adsorbents prepared under the conditions of 0.5 M NaOH, 150 min, and 75 °C showed the maximal sulfur capacity, the breakthrough and saturation sulfur capacities of which were 14.00 and 17.46 mg of S/g of adsorbent, respectively. In addition, Ni2+ ions were exchanged into mesoporous ZSM-5 zeolites to enhance the sulfur selectivity. The results proved that the selectivity of sulfur could be improved by an introduced metal ion because the Brönsted acid sites were decreased while the Lewis acid sites were increased.

Effect of Content of Cerium Ion on Brönsted‐Acid‐Catalyzed Reaction of Thiophene over CeY Zeolite Studied by In Situ FTIR Spectroscopy

“…For making up the disadvantages of HDS technique, some non‐hydrodesulfurization techniques ( e. g. in situ sulfur removal, reactive adsorption desulfurization, oxidative desulfurization (ODS), alkylation desulfurization and selective adsorption desulfurization (SADS) are being developed as auxiliary methods. Among these technologies, SADS process is regarded as a promising “zero‐sulfur” technology owing to its mild conditions, good desulfurization performance, low cost, and minimal octane loss . So far, various types of adsorbents for SADS have been reported .…”

The Role of NiO in Reactive Adsorption Desulfurization Over NiO/ZnO-Al2O3-SiO2 Adsorbent

“…Many publications discussed the mechanism of RADS over Ni/ZnO-based adsorbent [8][9][10][11][12][13]. Babich and Moulijin [14] first proposed a mechanism of RADS over Ni/ZnO-based adsorbent.…”

Selective Synthesis of Ethyl Methyl Carbonate via Catalytic Reactive Distillation over Heterogeneous MgO/HZSM‐5

“…The XRD abbreviation has not been defined before patterns of supported HZSM‐5 are shown in Figure . The XRD patterns of 2.3%MgO/HZSM‐5 and 2.3%CaO/HZSM‐5 had a typical peaks of HZSM‐5 . It was confirmed that the total crystallinity did not change, and the zeolite framework was not broken after loading MgO and CaO.…”