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Featured researches published by Xuan Meng.


Chemical Papers | 2014

Effect of valence of copper on adsorption of dimethyl sulfide from liquid hydrocarbon streams on activated bentonite

Huan Huang; Dezhi Yi; Yan-Nan Lu; Xiaolin Wu; Yunpeng Bai; Xuan Meng; Li Shi

Samples of activated bentonite and activated bentonite modified with CuCl and CuCl2, separately, were tested as dimethyl sulfide (DMS) adsorbents. The adsorption and desorption behaviours of DMS on the adsorbents were studied systematically. The adsorbents were characterised by nitrogen adsorption, XRD, and DMS-TPD tests. The addition of CuCl and CuCl2 to the activated carbon significantly enhanced the adsorption capacity of DMS, despite a notable decrease in the specific surface area and total pore volume of the activated bentonite. It is presumed that copper cation species may act as an adsorption site for DMS. The adsorption capacity of Cu(II)-bentonite was better than that of Cu(I)-bentonite. The DMS-TPD patterns indicate that the stronger electrophilicity of Cu(II) compared to that of Cu(I) caused it to interact with the DMS molecules more strongly, thus contributing to a better adsorptive performance. The Cu(II)-bentonite calcined at 150°C had the best DMS removal performance with a high sulphur capacity of 70.56 mg S g−1 adsorbent. The DMS removal performance became much lower with the increase in the calcination temperature, which appeared to be due to the decrease in the CuCl2·2H2O phase and the formation of the monoclinic Cu(OH)Cl phase.


Journal of Sulfur Chemistry | 2018

From waste to best: excellent desulfurization performance of spent FCC catalyst

Baochuan Su; Li Shi; Xuan Meng; Xin Wang; Naiwang Liu

ABSTRACT Fluidized catalytic cracking (FCC) is an important link in heavy oil processing. Industrial FCC catalyst which mainly consists of molecular sieves, substrates and adhesives is used in large quantities every year. Spent FCC catalyst is one kind of hazardous solid waste that is hard to handle. In this paper, we used a spent FCC catalyst as a desulfurization adsorbent, and show that it displays advanced desulfurization property. Furthermore, regeneration experiment showed that calcination was an effective method to remove the sulfides adsorbed in spent FCC catalyst, after four cycles it still owned a high sulfur adsorption ability. The results of metal impregnation indicated that the high ability to remove sulfur in LPG was due to those metals deposited on WC. The sulfur removal further increased by calcination of the spent catalyst since carbon deposition on the catalyst surface which blocked the active sites was minimized by calcination, thus leading an increase in the number of active sites available. GRAPHICAL ABSTRACT


Environmental Technology | 2018

Excellent adsorption performance of dibenzothiophene on functionalized low-cost activated carbons with different oxidation methods

Zhan Yu; Dan Wang; Yue Yang; Xuan Meng; Naiwang Liu; Li Shi

ABSTRACT Low-cost activated carbon (KAC) was functionalized by HNO3, (NH4)2S2O8 and air oxidation, respectively, to remove dibenzothiophene (DBT) from model fuel. The changes in physical and chemical properties of these activated carbons were characterized by thermal analysis, elemental analysis, nitrogen adsorption apparatus, Raman spectra, scanning electron microscope and Boehm’s titration method. HNO3 and (NH4)2S2O8 oxidation result in a significant decrease in pore structure, while air oxidation only causes slight pore reduction due to the re-activation by O2. The oxygen-containing functional groups (OFGs) increase markedly after oxidative modification, in which (NH4)2S2O8 oxidation is considered as the most efficient method with respect to the introduction of OFGs. HNO3 and (NH4)2S2O8 oxidation are more selective to generate carboxyls and lactones, whereas air oxidation creates more phenols, carbonyls and ethers. The DBT adsorption capacity follows the order: NAC (HNO3-oxidized KAC) > OAC (air-oxidized KAC) > KAC > SAC ((NH4)2S2O8-oxidized KAC), implying the introduction of OFGs is beneficial for the DBT adsorption process, especially for selectivity, but excessive OFGs have a negative effect on the removal of DBT. Thus, to achieve high DBT adsorption performance, there should be a trade-off between the micropore volume and the OFGs amount. GRAPHICAL ABSTRACT


Chemical Papers | 2016

Adsorption desulphurisation of dimethyl sulphide using nickel-based Y zeolites pretreated by hydrogen reduction

Xiao-Ling Yu; Yan-Nan Lu; Huan Huang; Dezhi Yi; Li Shi; Xuan Meng

A series of nickel-modified Y zeolites were prepared for the adsorption of dimethyl sulphide (DMS) in liquid hydrocarbon streams. The adsorption desulphurisation performance was investigated under ambient conditions of nickel-based adsorbents developed by the liquid-phase ion exchange (LPIE) method and the incipient wetness impregnation (IWI) method with and without the ultrasonic aid technique. It was found that the nickel-modified Y zeolite prepared by the IWI method with the ultrasonic aid technique with hydrogen reduction demonstrated a high sulphur capacity of 69.9 mg of S per g of sorbent at a break-through sulphur level of 10 μg g−1. The sorbents thus prepared were characterised by elemental analysis, XRD, TPR, H2 chemisorption, pyridine-FTIR, XPS, and SEM. The results showed that a high dispersion of metallic nickel atoms loaded on Y zeolite had an important role in determining the DMS removal capacity and the adsorption behaviour exhibited a pronounced dependence on the metal introduction method.


Applied Catalysis B-environmental | 2014

Adsorption–desorption behavior and mechanism of dimethyl disulfide in liquid hydrocarbon streams on modified Y zeolites

Dezhi Yi; Huan Huang; Xuan Meng; Li Shi


Industrial & Engineering Chemistry Research | 2013

Reactive Mechanism and Regeneration Performance of NiZnO/Al2O3-Diatomite Adsorbent by Reactive Adsorption Desulfurization

Xuan Meng; Huan Huang; Li Shi


Industrial & Engineering Chemistry Research | 2013

Desulfurization of Liquid Hydrocarbon Streams via Adsorption Reactions by Silver-Modified Bentonite

Dezhi Yi; Huan Huang; Xuan Meng; Li Shi


Chemical Engineering Journal | 2013

Study on the adsorption behavior and mechanism of dimethyl sulfide on silver modified bentonite by in situ FTIR and temperature-programmed desorption

Huan Huang; Dezhi Yi; Yan-Nan Lu; Xiaolin Wu; Yunpeng Bai; Xuan Meng; Li Shi


Bulletin of The Korean Chemical Society | 2012

Ni/ZnO-based Adsorbents Supported on Al2O3, SiO2, TiO2, ZrO2: A Comparison for Desulfurization of Model Gasoline by Reactive Adsorption

Xuan Meng; Huan Huang; Huixin Weng; Li Shi


Bulletin of The Korean Chemical Society | 2013

Gasoline Desulfurization by Catalytic Alkylation over Methanesulfonic Acid

Xiaolin Wu; Yunpeng Bai; Ying Tian; Xuan Meng; Li Shi; Received June

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Li Shi

East China University of Science and Technology

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Dezhi Yi

East China University of Science and Technology

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Naiwang Liu

East China University of Science and Technology

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Huan Huang

East China University of Science and Technology

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Chao Yang

East China University of Science and Technology

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Zhiming Ma

East China University of Science and Technology

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Xiaolin Wu

East China University of Science and Technology

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Yan-Nan Lu

East China University of Science and Technology

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Yunpeng Bai

East China University of Science and Technology

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Xin Wang

East China University of Science and Technology

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