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Catalytic performances of Mn–Ni mixed hydroxide catalysts in liquid-phase benzyl alcohol oxidation using molecular oxygen

Paper ID Volume ID Publish Year Pages File Format Full-Text
41413 45888 2011 6 PDF Available
Title
Catalytic performances of Mn–Ni mixed hydroxide catalysts in liquid-phase benzyl alcohol oxidation using molecular oxygen
Abstract

Mn–Ni mixed hydroxide was synthesized by a facile co-precipitation method and the catalytic performance in the aerobic oxidation of benzyl alcohol using molecular oxygen was examined. The Mn/Ni molar ratio played an important role and the sample with Mn/Ni molar ratio of 6:4 showed the best catalytic activity. High specific activity of 8.9 mmol/(g h) along with the benzaldehyde selectivity of 99% was achieved at 100 °C within 1 h. Characterizations of X-ray diffraction, X-ray absorption and hydrogen temperature-programmed reduction suggested that co-precipitation method afforded the formation of Mn-in-Ni(OH)2 solid solution without phase segregation. Excess amounts of Mn resulted in segregated Mn3O4 crystalline phase, which showed low surface area and poor catalytic activity. The synergistic interactions between Mn(III) and Ni(II) cations through oxygen bonding were suggested to enhance the activity of Mn–Ni mixed hydroxide catalysts for benzyl alcohol oxidation.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (94 K)Download as PowerPoint slideHighlights► Mn–Ni mixed hydroxide catalyst is prepared by facile co-precipitation. ► A Mn-in-Ni(OH)2 solid solution is formed and shows low reduction onset. ► The prepared catalyst is active in benzyl alcohol aerobic oxidation. ► Excess Mn results in segregated Mn3O4 phase with poor activity. ► The synergistic interactions exsit between Mn(III) and Ni(II) cations.

Keywords
Mn–Ni mixed hydroxide catalyst; Benzyl alcohol; Oxidation; Molecular oxygen
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Catalytic performances of Mn–Ni mixed hydroxide catalysts in liquid-phase benzyl alcohol oxidation using molecular oxygen
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 403, Issues 1–2, 22 August 2011, Pages 136–141
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us