Nanopetal-like copper hydroxide nitrate as a highly selective heterogeneous catalyst for valorization of vanillic alcohol via oxidation

Journal article

Authors/Editors

SONGKEART PHATTARAPATTAMAWONG

Strategic Research Themes

Sustainable environmental technology (Sustainable Energy & Environment)

Publication Details

Author list: Li B.-C., Huy N.N., Lin J.-Y., Phattarapattamawong S., Lisak G., Wang H., Lin K.-Y.A.

Publisher: Elsevier

Publication year: 2021

Journal: Journal of Environmental Chemical Engineering (2213-2929)

Volume number: 9

Issue number: 5

ISSN: 2213-3437

eISSN: 2213-3437

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85111562712&doi=10.1016%2fj.jece.2021.106092&partnerID=40&md5=b553d6310daaff00e531e0906489fd5e

Languages: English-Great Britain (EN-GB)

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Abstract

Valorization of lignin derivative, vanillic alcohol (VL), to vanillic aldehyde (VE) represents a critical move towards sustainable utilization of lignocellulosic biomass. As conversion of VL into VE requires the specific oxidation of alcohol moiety of VL into an aldehyde moiety, it is crucial to develop effective processes to selectively oxidize the alcohol group of VL. Lately, 2,2,6,6-tetramethylpiperidin-oxyl (TPO) accompanied with Cu has been validated as a promising oxidative catalytic process for oxidizing alcohols. Since Cu-O cluster plays an important role in TPO-based oxidation of alcohols, and N-O moiety would facilitate the catalytic cycle of TPO regeneration, an interesting solid-phase material, copper hydroxide nitrate (CHN) is proposed here for the first time for co-catalyzing TPO to oxidize VL into VE. In particular, a convenient method is developed to fabricate CHN with a special morphology of 2D elliptical nanopetal, forming nanopetal CHN (NPCHN). As TPO or NPCHN could not convert VL into VE separately, the combination of NPCHN/TPO quickly oxidizes VL to VE with a selectivity of 100%. With higher concentrations of NPCHN and TPO, the conversion efficiency of VL into VE could be considerably enhanced and reached ~99% of CVL and YVE with SVE = 100%. The extended reaction duration and elevated reaction temperature would also lead to the significantly high VL conversion efficiency, which also outperforms many reported conversion efficiencies. NPCHN could be also recyclable for co-catalyzing with TPO for converting VL to VE. These findings confirm that NPCHN is certainly an advantageous heterogeneous catalyst for valorizing VL via selective oxidation. © 2021

Keywords

Copper nitrate hydroxide, TPO, Vanillic alcohol, Vanillic aldehyde