沥青基球状活性炭气相吸脱附行为研究

本文利用热重法研究了一系列沥青基球状活性炭对蒸汽及正已烷蒸汽的动态吸脱附曲线。结果表明,PSAC对苯蒸汽的吸附及再生性能优良。随吸附温度的降低、比表面积的增大、总孔容及微孔容的增大,PSAC对苯蒸汽的吸附容量增大。PSAC对正已烷的吸附速度大于对苯蒸汽的吸附速度,但其对正已烷的平衡吸附容量小于对苯蒸汽的平衡吸附容量。     

不同形貌Sb2O3的控制合成及其光催化性能研究

采用醇解法与水热法制备了Sb2O3光催化材料,研究了制备条件对Sb2O3晶型、形貌及催化性能的影响.结果表明,以PEG-400为表面活性剂、反应体系pH=7时,通过醇解法制得的立方晶型、呈球形颗粒状的Sb2O3催化性能最佳,在紫外光照180 min时,对10.0 mg/L罗丹明B的降解率达到了96.8;;对20.0 mg/L左氧氟沙星降解率为66.3;;对10.0 mg/L磺胺吡啶降解率为46.2;.当反应温度为160℃,反应时间为12 h时,由水热法制得的斜方晶型、呈枕头状的Sb2O3催化性能较差,在紫外光照射180 min时,对10.0 mg/L罗丹明B的降解率为57;.     

诱导效应指数与脂肪族胺、醇和醚的气相碱性

用烷基诱导效应指数I和RX分子中质子亲合原子X所带电荷qx及元素电负性XN与 脂肪胺，醇、醚的气相质子亲合PA进行关联，结果表明，脂肪胺，醇、醚的气相碱 性可以用下式定量描述：PA(kJ.mol^-1)-2732.0333-2457.1510∑I-1492.2351qx- 732.6277XN利用上式对64种化合物的气相碱性进行预测，平均相对误差为0．34％ ，预测值和实验值的偏差均在实验误差范围内。     

多吡唑烷配合物研究进展

描述了双吡唑烷及其三吡唑甲烷配体的合成,详细地综述了它们在无机配位化学及金属有机等方面近年来的研究进展。     

可见光/路易斯碱协同催化的三氟甲基取代烯烃脱氟硅化反应研究

以三氟甲基取代烯烃为底物,使用硅硼烷为硅自由基供体,开发了一项可见光/路易斯碱协同催化的脱氟硅化反应新技术,实现了多样性偕二氟烯丙基硅砌块的绿色高效合成.新反应以奎宁环为路易斯碱催化剂,通过其对硅硼键的辅助活化促进硅自由基生成,表现出绿色温和、体系简单、易于放大、底物适用范围广和官能团兼容性强等优势.此外,本研究还初步展示了该类合成砌块在多类型含偕二氟甲基结构单元构建中的应用.     

Study on Ni/C catalysts for vapor phase carbonylation of ethanol

Activated carbon-supported Ni catalysts for vapor phase carbonylation of ethanol to propionic acid in the presence of ethyl iodide as promoter were investigated. Under optimum reaction conditions, the conversions of carbon monoxide and ethanol were measured to be 81.4% and 98.4%, respectively, while the selectivity for propionic acid was found to be 98.65%. The catalyst was stable within 48 h on stream. XRD and XPS methods were used to characterize the structures and surface properties of the fresh and tested catalysts. The characterization results indicated that aggregation of nickel particles and formation of nickel iodide on the catalyst surface should be responsible for the deactivation of the catalysts.     

(4R)-5,5-二甲基-4-苄硫甲基-2-噁唑烷酮的合成

以价廉易得的天然L-半胱氨酸为原料,经巯基保护、酯化、氨基保护、格氏反应及环化等5步反应,合成了一个新的手性助剂(4R)-5,5-二甲基-4-苄硫甲基-2-噁唑烷酮,总收率31%.产物结构经IR,~1H NMR,~(13)C NMR及MS表征.     

An improved synthesis of （-）-7-isopropyl-cis-1-amino-2-indanol the chiral auxiliary for 6π-azaelectrocyclization

(-)-7-Isopropyl-cis-1-amino-2-indanol, a key chiral auxiliary and ligand in the highly stereo-selective asymmetric 6π-azaelectrocyclization, has been prepared previously by two methods. Each however involved using of one extreme condition, i.e. high temperature or high pressure, for the respective reaction. A modified reaction route employed mild condition for synthesis was presented in this report.