Antimonate removal from water using hierarchical macro-/mesoporous amorphous alumina

Dou, Xiaomin; Mohan, Dinesh; Zhao, Xueqin; Pittman, Charles U.

doi:10.1016/j.cej.2014.11.123

Cited by 39 publications

(5 citation statements)

References 41 publications

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“…As shown in Scheme A, isolated tetrahedral WO 4 species provide the Lewis acid sites. The structure of isolated WO 4 species has also been proposed by many researchers. , It is well-known that the γ-Al 2 O 3 surface is composed of mainly octahedral and tetrahedral Al sites. , Furthermore, it is suggested experimentally and theoretically that a tetrahedral surface Al site has a stronger Lewis acidity than an octahedral one. , The tetrahedral AlO 4 structure on γ-Al 2 O 3 surface is shown in Scheme B. In addition, Davis et al found that Sn incorporated in the framework of zeolite Beta, which is also present as tetrahedral coordination and acts as Lewis acid, performed the isomerization reaction following an intramolecular hydride shift mechanism between the carbonyl-containing C-1 and hydroxyl-bearing C-2 of glucose by a way of a 5-member complex.…”

Section: Resultsmentioning

confidence: 96%

“…48,68 It is well-known that the γ-Al 2 O 3 surface is composed of mainly octahedral and tetrahedral Al sites. 69,70 Furthermore, it is suggested experimentally and theoretically that a tetrahedral surface Al site has a stronger Lewis acidity than an octahedral one. 69,70 The tetrahedral AlO 4 structure on γ-Al 2 O 3 surface is shown in Scheme 2B.…”

Section: Resultsmentioning

confidence: 99%

“…69,70 Furthermore, it is suggested experimentally and theoretically that a tetrahedral surface Al site has a stronger Lewis acidity than an octahedral one. 69,70 The tetrahedral AlO 4 structure on γ-Al 2 O 3 surface is shown in Scheme 2B. In addition, Davis et al 66 found that Sn incorporated in the framework of zeolite Beta, which is also present as tetrahedral coordination and acts as Lewis acid, performed the isomerization reaction following an intramolecular hydride shift mechanism between the carbonylcontaining C-1 and hydroxyl-bearing C-2 of glucose by a way of a 5-member complex.…”

Section: Resultsmentioning

confidence: 99%

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Effect of WO_x on Bifunctional Pd–WO_x/Al₂O₃ Catalysts for the Selective Hydrogenolysis of Glucose to 1,2-Propanediol

Zhang

Sun³

et al. 2015

ACS Catal.

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A series of Pd−WO x /Al 2 O 3 catalysts with different contents of WO x were prepared by stepwise incipient wetness impregnations. The influence of WO x on the physicochemical properties of Pd−WO x /Al 2 O 3 catalysts, as well as their catalytic performance for the hydrogenolysis of glucose to 1,2-propanediol (1,2-PDO), was investigated. At low surface W density (0.3−2.1 W nm −2 ), distorted isolated WO x and oligomeric WO x are present on the Pd−WO x /Al 2 O 3 catalysts. Furthermore, isolated WO 4 are the dominating species on the Pd−WO x (5%)/Al 2 O 3 catalyst. When the W density increased to 3.1 W nm −2 , polymeric WO x species are dominant on the Pd−WO x (30%)/Al 2 O 3 catalyst. The Pd surface area decreased while the acid amount increased with increasing W density. Furthermore, increased Lewis acid sites are provided by isolated WO 4 and oligomeric WO x species whereas increased Brønsted acid sites exist on polymeric WO x species. Lewis acid sites promote glucose isomerization to fructose, which is an intermediate in glucose hydrogenolysis to 1,2-PDO. Metal sites catalyze CO hydrogenation and C−C hydrogenolysis, which avoid the coke formation on catalysts. 1,2-PDO selectivity is dependent on the synergy of Lewis acid and metal sites; however, Brønsted acid sites have no contribution to the 1,2-PDO production. Typically, the Pd−WO x (5%)/Al 2 O 3 catalyst possessing the optimal balance of Lewis acid and the metal site shows a 1,2-PDO selectivity of 60.8% at a glucose conversion of 92.2% and has a lifetime of over 200 h.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Effect of WO_x on Bifunctional Pd–WO_x/Al₂O₃ Catalysts for the Selective Hydrogenolysis of Glucose to 1,2-Propanediol

Zhang

Sun³

et al. 2015

ACS Catal.

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“…They reported a maximal adsorption capacity of 125 mg/g. Dou et al [189] investigated hierarchical macro-and mesoporous amorphous alumina as a sorbent for Sb(V). The results were compared with five different commercial alumina adsorbents and showed that this material had the highest adsorption capacity (118 mg/g) and fast adsorption kinetics.…”

Section: Antimony Removal From Waste Watermentioning

confidence: 99%

Antimony Recovery from End-of-Life Products and Industrial Process Residues: A Critical Review

Dupont

Arnout²,

Jones

et al. 2016

J. Sustain. Metall.

133

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Antimony has become an increasingly critical element in recent years, due to a surge in industrial demand and the Chinese domination of primary production. Antimony is produced from stibnite ore (Sb 2 O 3) which is processed into antimony metal and antimony oxide (Sb 2 O 3). The industrial importance of antimony is mainly derived from its use as flame retardant in plastics, coatings, and electronics, but also as decolourizing agent in glass, alloys in lead-acid batteries, and catalysts for the production of PET polymers. In 2014, the European Commission highlighted antimony in its critical raw materials report, as the element with the largest expected supply-demand gap over the period 2015-2020. This has sparked efforts to find secondary sources of antimony either through the recycling of end-of-life products or by recovering antimony from industrial process residues. Valuable residues are obtained by processing of gold, copper, and lead ores with high contents of antimony. Most of these residues are currently discarded or stockpiled, causing environmental concerns. There is a clear need to move to a more circular economy, where waste is considered as a resource and zero-waste valorization schemes become the norm, especially for rare elements such as antimony. This paper gives a critical overview of the existing attempts to recover antimony from secondary sources. The paper also discusses the possibility of waste valorization schemes to guarantee a more sustainable life cycle for antimony.

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“…This aluminum hydroxide precipitated as an amorphous phase [26], as detected on the PXRD pattern of the solid obtained at m LDH = 0.15 g. As the m LDH increased and the Al 3+ ions in solution were exhausted, the next metal ion to be precipitated was Cu 2+ . This metal ion precipitated as a LDH phase [10,11] but, as the CO 3…”

Section: Ldh Additionmentioning

confidence: 78%

Removal of heavy metals from simulated wastewater by in situ formation of layered double hydroxides

Peligro

Pavlović

Rojas

et al. 2016

Chemical Engineering Journal

150

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Antimonate removal from water using hierarchical macro-/mesoporous amorphous alumina

Cited by 39 publications

References 41 publications

Effect of WO_x on Bifunctional Pd–WO_x/Al₂O₃ Catalysts for the Selective Hydrogenolysis of Glucose to 1,2-Propanediol

Effect of WO_x on Bifunctional Pd–WO_x/Al₂O₃ Catalysts for the Selective Hydrogenolysis of Glucose to 1,2-Propanediol

Antimony Recovery from End-of-Life Products and Industrial Process Residues: A Critical Review

Removal of heavy metals from simulated wastewater by in situ formation of layered double hydroxides

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Antimonate removal from water using hierarchical macro-/mesoporous amorphous alumina

Cited by 39 publications

References 41 publications

Effect of WOx on Bifunctional Pd–WOx/Al2O3 Catalysts for the Selective Hydrogenolysis of Glucose to 1,2-Propanediol

Effect of WOx on Bifunctional Pd–WOx/Al2O3 Catalysts for the Selective Hydrogenolysis of Glucose to 1,2-Propanediol

Antimony Recovery from End-of-Life Products and Industrial Process Residues: A Critical Review

Removal of heavy metals from simulated wastewater by in situ formation of layered double hydroxides

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Effect of WO_x on Bifunctional Pd–WO_x/Al₂O₃ Catalysts for the Selective Hydrogenolysis of Glucose to 1,2-Propanediol

Effect of WO_x on Bifunctional Pd–WO_x/Al₂O₃ Catalysts for the Selective Hydrogenolysis of Glucose to 1,2-Propanediol