Remarkably high performance of clew-like ZnO superstructure in reactive adsorption desulfurization

Abstract

In this study, a clew-like ZnO superstructure was synthesized by a copolymer-controlled self-assembly homogeneous precipitation method. Ni was impregnated to the clew-like ZnO superstructure to obtain Ni/ZnO adsorbents. The synthesized materials were characterized by scanning electron microscopy, transmission electron microscopy, N 2 sorption, X-ray diffraction, Fourier transform infrared spectrometry, and H 2 -temperature programmed reduction techniques. The reactive adsorption desulfurization (RADS) performance of the adsorbents was evaluated in a fixed bed reactor using thiophene in n-octane as a model fuel. Sample Ni/ZnO-4h exhibits a remarkably high performance with a sulfur capacity of 189.1 mg S g -1 , which is above 6 times that of the one prepared with commercial ZnO. Characterization results show that the morphology changes from micro-clews to large solid sticks with the increase of the crystallization time.The loose and open architecture of the clew-like ZnO superstructure facilitates the diffusion of reactants/products, and prevents the adsorbent particles from breakage by supplying space for the volume expansion during the RADS process. The small nanoparticles in ZnO nanostrips result in a high sulfur adsorption capacity and also favor the dispersion of Ni, leading to an excellent RADS performance.

Multidimensional Evolution of Carbon Structures Underpinned by Temperature‐Induced Intermediate of Chloride for Sodium‐Ion Batteries

“…With the rapid increase of temperature, ZnO, Ni, and Cu are formed gradually, and some CQDS were attached to their surface. When the temperature reached 700 °C, the catalysts with activity have been obtained, which can effectively induce the evolution of 0D CQDs …”

Ordered mesoporous Cu-ZnO-Al 2 O 3 adsorbents for reactive adsorption desulfurization with enhanced sulfur saturation capacity

“…The breakthrough time was defined as the RADS time when the sulfur concentration of the effluent-desulfurized feed exceeded 10 mg/L. The ZnO conversion to ZnS (X) at the sulfur breakthrough point (10 mg/L) is expressed as [20]…”

“…Metallic Cu particles may be easily sintered in the reaction process; however, ZnO and Al2O3 can be regarded as stabilizers to prevent the Cu particles from sintering in the Cu crystallites [17,18], to thereby improve the activity and stability. The dynamic capacity of ZnO-based adsorbents and the reactive activity are always dependent on the particle size [19,20] of ZnO and Cu, respectively. ZnO not only acts as a support, but also as an S-acceptor [21].…”

Preparation and characterization of zinc oxide nanoparticles incorporated tragacanth nanofibers for adsorbing fuel sulfur compounds

“…It is reminded that ZnO based sorbents have become common in this field. 20 It goes without saying that basically nanoparticles enjoy much greater specific surface area when compared with their bulk form and of course, ZnO is no exception. The high specific surface area of ZnO nanoparticles enhances the sulfur adsorption capacity considerably.…”

“…According to Bai et al 20 metal oxides like ZnO, CaO, and MnO show excellent performance in the desulfurization of oil products, which is believed to originate from the high adsorption capacity of the above mentioned metal oxides for sulfur compounds (C x H z S y ). Among these three metal oxides, ZnO had the upper hand.…”