| 吴敏雅,刘明华,刘以凡,吕源财.过渡金属硫酸盐协同Pd/C高效定向降解木质素的研究[J].中国造纸学报,2021,36(1):6-12 |
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| 过渡金属硫酸盐协同Pd/C高效定向降解木质素的研究 |
| Efficient and Product-controlled Degradation of Lignin Using Transition Metal Sulfates Cooperated with Pd/C |
| 投稿时间：2019-12-05 |
| DOI：10.11981/j.issn.1000-6842.2021.01.06 |
| 中文关键词: 过渡金属硫酸盐 Pd/C 木质素 定向降解 酚类化合物 |
| Key Words:transition metal sulfate Pd/C lignin product-controlled degradation phenolic compound |
| 基金项目:福建省高校产学合作项目（2019H6008）。 |
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| 摘要点击次数: 2704 |
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| 中文摘要: |
| 以改善当前木质素催化降解存在的降解产物可控性较差、小分子化合物总收率较低、均一化程度不足、难以进一步开发利用等问题为目标，采用过渡金属硫酸盐NiSO4·6H2O协同Pd/C催化降解玉米芯酶解木质素，考察了过渡金属离子、反应温度、反应时间、NiSO4·6H2O与Pd/C协同作用等对木质素降解率的影响，并分析了降解产物的分布和催化作用机理。结果表明，NiSO4·6H2O可有效提高Pd/C对木质素的催化降解效率，如木质素降解率相较于单独使用Pd/C催化降解时提高14.5%，小分子化合物总收率提高39.9%，其中，酚类化合物的得率提高88.6%，且产物的均一化程度提高了35.8%；分析表明，由于NiSO4·6H2O的路易斯酸特性和镍离子的高电负性，木质素的醚键可有效地在Pd/C和NiSO4·6H2O酸性催化中心上发生裂解，并通过加氢反应，定向生成以酚类为主体的中间产物。 |
| Abstract: |
| In order to overcome several obstacles which limit the further development and utilization of degradation products existing in lignin catalytic degradation at present， such as poor product-controlled property， low yield of small molecule compounds， insufficient degree of uniformity， and difficulty for further utilization. NiSO4·6H2O cooperated with Pd/C was used to catalyze the degradation of corncob lignin in this study. The effects of transition metal ions， reaction temperature， reaction time， and synergistic effect of NiSO4·6H2O and Pd/C on lignin degradation ratio were investigated. Meantime， the degradation products and mechanism were analyzed. The results showed that NiSO4·6H2O cooperated with Pd/C could effectively improve the lignin degradation ratio. The degradation ratio was increased by 14.5%， and the yield of small molecules was improved by 39.9%. Especially， the yield of phenolic compounds was increased by 88.6% and the products uniformity was upgraded by 35.8% as well. Due to the properties of Lewis acid and the high electronegativity of Ni2+ in NiSO4·6H2O， the ether bonds of lignin could be cleaved on the acidic catalytic centers of Pd/C and NiSO4·6H2O effectively， and phenolic compounds were formed through the hydrogenation reaction. |
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