Preparation of AlCl3/silica gel catalyst for simultaneously removing thiophene and olefins from coking benzene by inclosed grafting method

Liao, Junjie; Bao, Lei; Wang, Wenbo; Xie, Yuanyuan; Chang, Jinyu; Wang, Bao; Chang, Liping

doi:10.1016/j.fuproc.2013.02.017

Cited by 15 publications

(10 citation statements)

References 20 publications

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“…Several papers have been published by our group and others on the adsorption desulfurization of coking benzene by using suitable sorbents, such as modified ZSM-5 zeolite, [30][31][32][33] modified MCM-41 zeolite, 34 nickel based amorphous alloy 35 and modified γ-Al 2 O 3 36 and SiO 2 . 37 However, these sorbents could not remove enough of the thiophene from benzene to give the required low sulfur concentration. Compared with other sorbents which have been trialed for adsorption desulfurization from coking benzene, a Y-type zeolite has many properties which make it a more useful sorbent for molecular separation including uniform size pores, large surface area, good thermal stability and strong adsorption selectivity.…”

Section: Sorbent Modification and Deep Removal Of Thiophenementioning

confidence: 99%

A process for desulfurization of coking benzene by a two-step method with reuse of sorbent/thiophene and its key procedures

et al. 2015

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Section: Sorbent Modification and Deep Removal Of Thiophenementioning

confidence: 99%

A process for desulfurization of coking benzene by a two-step method with reuse of sorbent/thiophene and its key procedures

et al. 2015

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“…As one of the important industrial chemical feedstock, pure benzene is mainly derived from petroleum benzene and coking benzene. 11 Coking benzene with relatively rich resources (about 4 million tons in China 2017) has received increasing emphasis in the situation of insufficient petroleum resource and increasing benzene demand. 12 The existence of thiophene, which is physically and chemically similar to benzene, severely limited the utilization range of benzene, 13 therefore, deep removal of thiophene are quite necessary.…”

Section: Introductionmentioning

confidence: 99%

Insight into the Acid Sites over Modified NaY Zeolite and Their Adsorption Mechanisms for Thiophene and Benzene

Liao

Zhang²,

Fan

et al. 2019

Ind. Eng. Chem. Res.

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Series of HY sorbents with different amounts and strength of Brønsted and Lewis acidic sites were prepared. Their adsorption performance in thiophene–benzene solution, pure benzene, and pure thiophene were evaluated, and the desulfurization mechanisms were studied. The results show that both thiophene and benzene could be effectively adsorbed through the interaction between Lewis acid sites and the conjugated π bond in these two molecules, and thus thiophene adsorption could be obviously competed by benzene on Lewis acidic sites. By contrast, on Brønsted acidic sites, thiophene can be efficiently adsorbed via H–S bond, which is stronger than the former interaction. Moreover, the middle strong Brønsted acid could cause thiophene oligomerization. Hence, for the desulfurization purpose by NaY zeolite in aromatic free system, its weak and middle strong Lewis acid should be increased, and for that in aromatic existing system, the Brønsted acid site with relative low strength should be promoted.

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“…Even though it is typically used as a solid, generation of inorganic and acidic waste through leaching remains a problem, making separation of products difficult. This has led several researchers to investigate the possibility of supporting Al 2 Cl 6 on various types of solid supports like SiO 2 [20][21][22][23][24][25][26][27][28][29], Al 2 O 3 [30], mesoporous silica like MCM-41 [31,32], polystyrene [33][34][35] and so forth. These supported aluminum chloride catalysts showed high activity in various acid-catalyzed processes including alkylation [36], polymerization [26,30], isomerization [21] and Mannich synthesis [25].…”

Section: Introductionmentioning

confidence: 99%

Probing the Surface Acidity of Supported Aluminum Bromide Catalysts

et al. 2020

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Solid acid catalysis is an important class of reactions. The principal advantages of solid acid catalysts as compared to their corresponding fluid acids include minimal waste and ease of product separation. One type of these catalysts is based on aluminum bromide (Al2Br6), which is a stronger Lewis acid than Al2Cl6. In this report, Al2Br6 is grafted on commercial mesoporous silica (CMS), SBA-15 and silica gel to create a solid catalyst similar to the silica-supported Al2Cl6 superacid. These supported Al2Br6 catalysts were characterized by NH3-Temperature Programmed Desorption (TPD), pyridine Diffuse Reflectance for Infrared Fourier Transform Spectroscopy (DRIFTS) and Magic Angle Spinning Nuclear Magnetic Resonance (MAS NMR). Formation of acid sites was confirmed and quantified with NH3-TPD. Both Lewis and Brønsted sites were observed with DRIFTS using pyridine as a probe molecule. In addition, thermal stability of acid sites was also studied using DRIFTS. 27Al MAS NMR analysis showed tetrahedral, pentahedral and octahedral co-ordination of Al, confirming that Al2Br6 reacted with –OH groups on silica surface. Performance of these catalysts was evaluated using acid-catalyzed 1-butene isomerization. Conversion above 80% was observed at 200 °C, corresponding to thermodynamic equilibrium.

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Preparation of AlCl3/silica gel catalyst for simultaneously removing thiophene and olefins from coking benzene by inclosed grafting method

Cited by 15 publications

References 20 publications

A process for desulfurization of coking benzene by a two-step method with reuse of sorbent/thiophene and its key procedures

A process for desulfurization of coking benzene by a two-step method with reuse of sorbent/thiophene and its key procedures

Insight into the Acid Sites over Modified NaY Zeolite and Their Adsorption Mechanisms for Thiophene and Benzene

Probing the Surface Acidity of Supported Aluminum Bromide Catalysts

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