Abstract

Catalytic methanolysis of wheat straw (WS) pretreated by Na₂CO₃ with different concentrations was performed at 270 and 300°C, respectively. The samples without pretreatment and with pretreatment by 0.1 and 0.5 mol/L Na₂CO₃ were denoted as WS₀, WS_0.1 and WS_0.5, respectively. The results show that the maximum and minimum yields of bio-oil were obtained from catalytic methanolysis of WS_0.1 and WS_0.5, respectively. In addition, the yield of bio-oil and the conversion at 300°C were both higher than that at 270°C. Compounds identified with gas chromatograph/mass spectrometer (GC/MS) in bio-oil were classified into alcohols, alkanes, esters, furans, cyclopentanones, phenols, aldehydes, benzenes, ketones, nitrogen-containing compounds and other compounds. FTIR analysis of bio-oil shows that most of soluble organic compounds are oxygen-containing species and phenols are the most abundant in bio-oil. The relative content (about 10%) of phenols in bio-oil of WS_0.1 and WS_0.5 were lower than that in WS₀, while the relative content of furans and esters increases about 10%. These facts indicate that a certain dose of Na₂CO₃ was able to promote the methanolysis of cellulose and facilitate a further decomposition of lignin.

中文翻译：

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Na2CO3在超临界甲醇中催化分解小麦秸秆

摘要

_{不同浓度Na 2} CO ₃预处理的小麦秸秆（WS）的催化甲醇分解分别在270和300℃下进行。未经预处理和经0.1和0.5 mol/L Na ₂ CO ₃预处理的样品分别表示为WS ₀、WS _0.1和WS _0.5。结果表明，WS _0.1和 WS _{0.5的催化甲醇解获得生物油的最大和最小产率。}， 分别。此外，300℃时生物油的收率和转化率均高于270℃时。用气相色谱/质谱仪（GC/MS）鉴定生物油中的化合物分为醇类、烷类、酯类、呋喃类、环戊酮类、酚类、醛类、苯类、酮类、含氮化合物等化合物。生物油的 FTIR 分析表明，大多数可溶性有机化合物是含氧物质，酚类物质在生物油中含量最多。_{WS 0.1}和WS _0.5生物油中酚类的相对含量（约10%）低于WS ₀，而呋喃和酯类的相对含量增加了约10%。这些事实表明，一定剂量的 Na ₂ CO ₃能够促进纤维素的甲醇分解并促进木质素的进一步分解。