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纤维素一步法制备乙醇酸工艺优化
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作者 李秀峥 白富栋 +3 位作者 孙启梅 张雷 白毓黎 王鹏翔 《现代化工》 CAS CSCD 北大核心 2024年第S01期280-283,共4页
采用纤维素一步法制备了乙醇酸,分别考察了催化剂种类、催化剂用量、反应温度、反应时间、初始O_(2)压力对纤维素制备乙醇酸反应的影响;利用液相色谱法对产物中乙醇酸含量进行了表征。研究发现,当微晶纤维素用量为0.5 g、磷钼酸水合物... 采用纤维素一步法制备了乙醇酸,分别考察了催化剂种类、催化剂用量、反应温度、反应时间、初始O_(2)压力对纤维素制备乙醇酸反应的影响;利用液相色谱法对产物中乙醇酸含量进行了表征。研究发现,当微晶纤维素用量为0.5 g、磷钼酸水合物催化剂用量为1.05 mmol、H2O用量为50 mL、初始O_(2)压力为0.2 MPa、反应温度为180℃、反应时间为1 h时,乙醇酸收率最高,达到47.0%。 展开更多
关键词 乙醇酸 纤维素 磷钼酸水合物 可降解 单体 合成工艺
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Hydrothermal Synthesis and Structure of a Novel Molybdenum Phosphate: Na_4(H_3O) [Na(HPO_4)_2(PO_4)_4Mo_(18)O_(49)]·16H_2O
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作者 林郑忠 张汉辉 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2001年第6期447-450,共4页
The title compound Na5H37P6Mo18O90 1 (Mr=1658) was synthesized under hydrothermal condition and its crystal structure was determined by X-ray diffraction. It crystallized in the monoclinic system, space group P21 with... The title compound Na5H37P6Mo18O90 1 (Mr=1658) was synthesized under hydrothermal condition and its crystal structure was determined by X-ray diffraction. It crystallized in the monoclinic system, space group P21 with a =14.957(1), b =16.535(1), c = 16.159(1)?β=108.586(2)°, V=3787.85?, Dc =3.040g/cm3, Z=2,μ(MoK)=3.17mm-1, F(000)=3242. The final R and wR are 0.0500 and 0.1535 for 6643 observable reflections with I≥2?I), respectively. The result of structure analysis indicates that [Na(HPO4)2(PO4)4-Mo18 O49]5-anions 2 in 1 has the symmetry of C2V, in which each MoVIO6 octahedron is connected to adjacent PO4 tetrahedra through corner-sharing and to adjacent octahedra through edge-sharing or corner-sharing. 展开更多
关键词 HYDROTHERMAL molybdenum phosphate crystal structure
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