Glycothermal Synthesis and Catalytic Properties of Nanosized Zn1−x Co x Al2O4 (x = 0, 0.5, 1.0) Spinels in Phenol Methylation

Walerczyk, Wiktoria; Zawadzki, M.; Grabowska, Hanna

doi:10.1007/s10562-011-0546-x

“…In the literature, CuAl 2 O 4 spinels on the surface of the catalysts and the ZnAl 2 O 4 stoichiometry spinel structures throughout their volume are the most frequently reported [7,8]. X-ray diffraction studies in the literature [9] indicate that the ZnAl 2 O 4 compound is present at a temperature of 1100 • C. Therefore, processing of the spent catalyst with the infusible spinel structures present in them, and the complete recovery of zinc from this type of material, can be difficult using the pyrometallurgical method. Due to the toxic metal content (Zn, Cu), these materials can be considered to pollute the natural environment.…”

Section: Introductionmentioning

confidence: 99%

Low-Waste Recycling of Spent CuO-ZnO-Al2O3 Catalysts

Małecki

¹

,

Gargul

²

2018

Metals

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CuO-ZnO-Al 2 O 3 catalysts are designed for low-temperature conversion in the process of hydrogen and ammonia synthesis gas production. This paper presents the results of research into the recovery of copper and zinc from spent catalysts using pyrometallurgical and hydrometallurgical methods. Under reducing conditions, at high temperature, having appropriately selected the composition of the slag, more than 66% of the copper can be extracted in metallic form, and about 70% of zinc in the form of ZnO from this material. Hydrometallurgical processing of the catalysts was carried out using two leaching solutions: alkaline and acidic. Almost 62% of the zinc contained in the catalysts was leached to the alkaline solution, and about 98% of the copper was leached to the acidic solution. After the hydrometallurgical treatment of the catalysts, an insoluble residue was also obtained in the form of pure ZnAl 2 O 4. This compound can be reused to produce catalysts, or it can be processed under reducing conditions at high temperature to recover zinc. The recovery of zinc and copper from such a material is consistent with the policy of sustainable development, and helps to reduce the environmental load of stored wastes.

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“…In the literature, CuAl 2 O 4 spinels on the surface of the catalysts and the ZnAl 2 O 4 stoichiometry spinel structures in all their volume are most frequently reported [7][8]. X-ray diffraction studies in the literature [9] indicate that the ZnAl 2 O 4 compound is present at a 1100 o C temperature. Therefore, processing of spent catalyst with infusible spinel structures present in them, and complete recovery of zinc from this type of materials can be difficult using the pyrometallurgical method.…”

Section: Introductionmentioning

confidence: 99%

Low-Waste Recycling of CuO-ZnO-Al2O3 Spent Catalysts

Małecki¹,

Gargul²

2018

Preprint

0

View full text Add to dashboard Cite

CuO-ZnO-Al2O3 catalysts are designed for the low-temperature shift conversion in the process of hydrogen and ammonia synthesis gas production. The paper presents the results of research on recovery of copper and zinc from spent catalysts using pyrometallurgical and hydrometallurgical methods. Under reducing conditions, at high temperature, having appropriately selected the composition of the slag, more than 66% of copper in metallic form and about 70% of zinc in the form of ZnO can be extracted from this material. Hydrometallurgical processing of the catalysts was carried out using two leaching solutions: alkaline and acidic. Almost 62% of the zinc contained in the catalysts has been leached to the alkaline solution and about 98% of copper has been leached to the acidic solution. After the hydrometallurgical treatment of the catalysts, insoluble residue was also obtained in the form of pure ZnAl2O4. This compound can be reused to produce catalysts, or it can be processed under reducing conditions at high temperature to recover zinc. The recovery of zinc and copper from such a material is consistent with the policy of sustainable development and helps to reduce the environmental load of stored wastes.

show abstract

“…In the literature, CuAl2O4 spinels on the surface of the catalysts and the ZnAl2O4 stoichiometry spinel structures in all their volume are most frequently reported [7][8]. X-ray diffraction studies in the literature [9] indicate that the ZnAl2O4 compound is present at a 1100 o C temperature. Therefore, processing of spent catalyst with infusible spinel structures present in them, and complete recovery of zinc from this type of materials can be difficult using the pyrometallurgical method.…”

Section: Introductionmentioning

confidence: 99%

Low-Waste Recycling of CuO-ZnO-Al2O3 Spent Catalysts

Małecki¹,

Gargul²

2018

Preprint

2

0

View full text Add to dashboard Cite

CuO-ZnO-Al2O3 catalysts are designed for the low-temperature shift conversion in the process of hydrogen and ammonia synthesis gas production. The paper presents the results of research on recovery of copper and zinc from spent catalysts using pyrometallurgical and hydrometallurgical methods. Under reducing conditions, at high temperature, having appropriately selected the composition of the slag, more than 66% of copper in metallic form and about 70% of zinc in the form of ZnO can be extracted from this material. Hydrometallurgical processing of the catalysts was carried out using two leaching solutions: alkaline and acidic. Almost 62% of the zinc contained in the catalysts has been leached to the alkaline solution and about 98% of copper has been leached to the acidic solution. After the hydrometallurgical treatment of the catalysts, insoluble residue was also obtained in the form of pure ZnAl2O4. This compound can be reused to produce catalysts, or it can be processed under reducing conditions at high temperature to recover zinc. The recovery of zinc and copper from such a material is consistent with the policy of sustainable development and helps to reduce the environmental load of stored wastes.

show abstract

Glycothermal Synthesis and Catalytic Properties of Nanosized Zn1−x Co x Al2O4 (x = 0, 0.5, 1.0) Spinels in Phenol Methylation

Cited by 16 publications

References 47 publications

Low-Waste Recycling of Spent CuO-ZnO-Al2O3 Catalysts

Low-Waste Recycling of Spent CuO-ZnO-Al2O3 Catalysts

Low-Waste Recycling of CuO-ZnO-Al2O3 Spent Catalysts

Low-Waste Recycling of CuO-ZnO-Al2O3 Spent Catalysts

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