La-modified SBA-15/H2O2 systems for the microwave assisted oxidation of organosolv beech wood lignin

In this manuscript, the influence of organosolv beech wood lignin (LOB) on its oxidative conversion to high added-value phenolic aldehydes is discussed. Environmental friendly and low-cost H2O2 was used as the oxygen atom donor. The catalyst was prepared by immobilizing Lanthanum compounds onto the...

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Autores principales:	Gu,Xiaoli, Kanghua,Cheng, Ming,He, Shi,Yijun, Li,Zhongzheng
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2012
Materias:	La/SBA-15 organosolv lignin heterogeneous catalysis microwave oxidation
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2012000100003
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spelling	oai:scielo:S0718-221X20120001000032012-05-31La-modified SBA-15/H2O2 systems for the microwave assisted oxidation of organosolv beech wood ligninGu,XiaoliKanghua,ChengMing,HeShi,YijunLi,Zhongzheng La/SBA-15 organosolv lignin heterogeneous catalysis microwave oxidation In this manuscript, the influence of organosolv beech wood lignin (LOB) on its oxidative conversion to high added-value phenolic aldehydes is discussed. Environmental friendly and low-cost H2O2 was used as the oxygen atom donor. The catalyst was prepared by immobilizing Lanthanum compounds onto the periodic mesoporous channels of siliceous SBA-15. The activity of the La/SBA-15 was investigated towards oxidation of LOB in the presence of hydrogen peroxide as oxidant with microwave irradiation. Considering the characteristics of LOB, an unexpected low syringaldehyde concentration at 10min of reaction time (1.47 g/L, corresponding to 15.66% yield) was obtained; the other major product was vanillin at 25min (0.78 g/L, i.e., 9.94% yield). The high reactivity of syringyl nuclei may be pointed out as the main reason for the faster production and degradation of syringaldehyde in oxidation. Other low molecular weight phenolic products were found: vanillic acid, syringic acid and minor quantities of aceto-derivatives. The profile of products concentration with the reaction time of catalytic oxidation with microwave irradiation are shown and discussed with reference to the investigated lignin features. The mechanism of the microwave catalytic oxidation for LOB under alkaline conditions was proposed.info:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.14 n.1 20122012-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2012000100003en10.4067/S0718-221X2012000100003
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	La/SBA-15 organosolv lignin heterogeneous catalysis microwave oxidation
spellingShingle	La/SBA-15 organosolv lignin heterogeneous catalysis microwave oxidation Gu,Xiaoli Kanghua,Cheng Ming,He Shi,Yijun Li,Zhongzheng La-modified SBA-15/H2O2 systems for the microwave assisted oxidation of organosolv beech wood lignin
description	In this manuscript, the influence of organosolv beech wood lignin (LOB) on its oxidative conversion to high added-value phenolic aldehydes is discussed. Environmental friendly and low-cost H2O2 was used as the oxygen atom donor. The catalyst was prepared by immobilizing Lanthanum compounds onto the periodic mesoporous channels of siliceous SBA-15. The activity of the La/SBA-15 was investigated towards oxidation of LOB in the presence of hydrogen peroxide as oxidant with microwave irradiation. Considering the characteristics of LOB, an unexpected low syringaldehyde concentration at 10min of reaction time (1.47 g/L, corresponding to 15.66% yield) was obtained; the other major product was vanillin at 25min (0.78 g/L, i.e., 9.94% yield). The high reactivity of syringyl nuclei may be pointed out as the main reason for the faster production and degradation of syringaldehyde in oxidation. Other low molecular weight phenolic products were found: vanillic acid, syringic acid and minor quantities of aceto-derivatives. The profile of products concentration with the reaction time of catalytic oxidation with microwave irradiation are shown and discussed with reference to the investigated lignin features. The mechanism of the microwave catalytic oxidation for LOB under alkaline conditions was proposed.
author	Gu,Xiaoli Kanghua,Cheng Ming,He Shi,Yijun Li,Zhongzheng
author_facet	Gu,Xiaoli Kanghua,Cheng Ming,He Shi,Yijun Li,Zhongzheng
author_sort	Gu,Xiaoli
title	La-modified SBA-15/H2O2 systems for the microwave assisted oxidation of organosolv beech wood lignin
title_short	La-modified SBA-15/H2O2 systems for the microwave assisted oxidation of organosolv beech wood lignin
title_full	La-modified SBA-15/H2O2 systems for the microwave assisted oxidation of organosolv beech wood lignin
title_fullStr	La-modified SBA-15/H2O2 systems for the microwave assisted oxidation of organosolv beech wood lignin
title_full_unstemmed	La-modified SBA-15/H2O2 systems for the microwave assisted oxidation of organosolv beech wood lignin
title_sort	la-modified sba-15/h2o2 systems for the microwave assisted oxidation of organosolv beech wood lignin
publisher	Universidad del Bío-Bío
publishDate	2012
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2012000100003
work_keys_str_mv	AT guxiaoli lamodifiedsba15h2o2systemsforthemicrowaveassistedoxidationoforganosolvbeechwoodlignin AT kanghuacheng lamodifiedsba15h2o2systemsforthemicrowaveassistedoxidationoforganosolvbeechwoodlignin AT minghe lamodifiedsba15h2o2systemsforthemicrowaveassistedoxidationoforganosolvbeechwoodlignin AT shiyijun lamodifiedsba15h2o2systemsforthemicrowaveassistedoxidationoforganosolvbeechwoodlignin AT lizhongzheng lamodifiedsba15h2o2systemsforthemicrowaveassistedoxidationoforganosolvbeechwoodlignin
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La-modified SBA-15/H2O2 systems for the microwave assisted oxidation of organosolv beech wood lignin

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