Preparation of γ-Al2O3 sorbents loaded with metal components and removal of thiophene from coking benzene

Abstract

Series sorbents of Cu, Zn, Ni, Ce and Ag metal components supported on γ -Al 2 O 3 carrier for removing thiophene from benzene were prepared by conventional and ultrasound-assisted incipient-wetness impregnation method. The static adsorption experiments were carried out in the thiophene-benzene solution with thiophene concentration of 500 mg/L. The results show that the desulfurization activity of all γ -Al 2 O 3 sorbents modified by different metal components obviously increase, among which the sorbent modified by silver nitrate has the best performance. The active components of sorbents from Cu, Zn, Ni, Ce nitrates loaded on γ -Al 2 O 3 carrier are their oxides. Besides Ag 2 O, the products of silver nitrate thermal decomposition in sorbent prepared still have Ag 0 and Ag-O-Al species. The assistant ultrasound in the process of sorbent preparation can not only shorten the impregnation time, but also enrich the pore structure of sorbent and improve the size and distribution of the Ag species, which is favorable to the removal of thiophene from benzene. The desulfurization capacity of sorbent changes with the Ag content loaded. The sorbent with 15 % quality content of Ag prepared by ultrasoundassisted impregnation method has the highest desulfurization efficiency. It could reduce the thiophene concentration to 1.7 mg/L from 500 mg/L at room temperature and ambient pressure, with the desulfurization efficiency of more than 99 %, when the ratio of sorbent to solution was 1:4 (g/mL).

Few-layered graphene-like boron nitride induced a remarkable adsorption capacity for dibenzothiophene in fuels

“…After that, a series of adsorbents which rely on π-complexation have been developed. Many studies have focused on dispersing these metals on various supports as π-complexation adsorbents, including zeolite, [30][31][32][33][34] alumina, [35][36][37] zirconia, 38 mesoporous silica, [39][40][41][42][43] β-cyclodextrin, 44 metal-organic frameworks (MOFs), 20,45 activated carbon, 46,47 and bentonite. 48 On the other hand, Song's group 49,50 tested various adsorbents under ambient conditions without H 2 gas and aimed at removing sulfur compounds from gasoline, jet fuels, and diesel fuels by a direct sulfuradsorbent interaction.…”

Preparation and characterization of poly(3-methylthiophene)/CeY zeolite composites

“…The peaks at 1636 cm À1 and 1447 cm À1 pertain to C-C stretching vibrations and C]C stretching vibrations of the thiophene ring, 21 respectively. 21,31 The FT-IR spectra of the P3MT/CeY composites present very different peak results to those discussed previously. 21,31 The bands around 708 cm À1 and 821 cm À1 belong to out-of-plane C-H deformation of a and b positions of 3MT, respectively.…”

“…In order to calculate R A , the bands around 797 cm À1 and 1447 cm À1 were deconvoluted as show in Fig. 21,31 Sample conductivity was studied using a ZC-36 ohmmeter (Shanghai Qiangjia Electrc Co., Ltd., China). The bands around 708 cm À1 and 821 cm À1 belong to out-of-plane C-H deformation of a and b positions of 3MT, respectively.…”

“…21,31 The bands around 708 cm À1 and 821 cm À1 belong to out-of-plane C-H deformation of a and b positions of 3MT, respectively. The peaks at 1636 cm À1 and 1447 cm À1 pertain to C-C stretching vibrations and C]C stretching vibrations of the thiophene ring, 21 respectively.…”

Adsorption of sulfur compound utilizing rice husk ash modified with niobium

“…The incorporation of metals such as Cu, Ni, Zn, Ag, Ce and Co [1,2,28,29] oxides such as Al 2 O 3 and TiO 2 [30][31][32][33][34], has received attention in desulfurization by adsorption, because of several possible interactions as much both the aromatic rings as with the heteroatom of sulfur (in the thiophenic derivatives), providing a greater selectivity for the sulfur compounds [35]. For example, the theoretical and experimental study of titanium oxide in the adsorption of thiophene demonstrated relatively weak and selective interactions between thiophene molecules and the metal oxide [36].…”