Lignin Acidolysis Predicts Formaldehyde Generation in Pine Wood
Lignin Acidolysis Predicts Formaldehyde Generation in Pine Wood
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DOI：
10.1021/acssuschemeng.7b00264
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发表时间：
2017-05
影响因子：
8.4
通讯作者：
Guigui Wan;C. Frazier
中科院分区：
文献类型：
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作者：
Guigui Wan;C. Frazier
为了揭示甲醛(CH2O)的产生机理，在干燥时或经过水/酸/碱处理后，对华山松木材进行了加热(200℃，10或60min)。与以前的报告一致，在木材结构聚合物中，木质素是生物CH2O(定义为木材中有碳源)的压倒性来源。木材萃取物的影响被忽略，留到以后的报告中。木质素模型化合物和分离木质素的酸解文献中预测，酸催化剂的选择对CH2O的生成有很大影响。在实验条件下观察到了木质素甲氧基的裂解，但认为不太可能是CH2O的来源。在中性水中观察到的水平以上，碱性预处理不能催化CH2O的产生。关于木基复合材料的制造，这意味着木质素的反应可能在热压过程中被操纵。潜在的好处包括减少产品排放和/或使用生物来源的CH2O的新颖的交联策略。也许..。
Pinus virginiana wood was heated (200 °C, 10 or 60 min) while dry or after aqueous/acid/base pretreatment in order to reveal mechanisms of formaldehyde (CH2O) generation. Consistent with prior reports, among wood structural polymers, lignin was the overwhelming source of biogenic CH2O (defined as having a carbon source in wood). Effects of wood extractives were ignored and reserved for a later report. The selection of acid catalyst strongly affected CH2O generation as predicted in the acidolysis literature of lignin model compounds and isolated lignins. Lignin methoxyl cleavage was observed but considered an unlikely source of CH2O under the experimental conditions. Alkaline pretreatments did not catalyze CH2O generation above levels observed using neutral water. Regarding wood-based composite manufacture, the implications are that lignin reactions might be manipulated during hot-pressing. Potential benefits include reduced product emissions and/or novel cross-linking strategies using biogenic CH2O. Perha...