在负载H3PO4的固体上3,3,4-三甲基-4-戊烯-2-酮的催化合成

3,3,4-Trimethyl-4-penten-2-one has been synthesized by the acylation of 2,3-dimethyl-2-butene with acetic anhydride in the presence of soild-supported H3PO4.By comparison of the acylation reactions of 2,3-dimethyl-2-butene with acetic anhydride over various soilds-supported H3PO4,it was found that K10 clay,silicagel,HY zeolite and HMordenite were good supports.The results obtined indicate that the soild-supported small amounts of H3PO4 possessed higher catalytic activities,For obatining a higher yield of 3,3,4-trimethyl-4-penten-2-one different supports required different modification methods.     

丁烯和丁烷自由基阳离子的分子结构和超精细结构的 理论研究

用密度函数理论B3LYP方法和6-31G(d,p),6-311G(d,p)及6-311+G(d,p)基组，分别对1-C4H^+~8,2-C4H^+~8和C4H^+~10进行了构型优化和频率分析计算，预言1-C4H^+~8具有非平面构型，与以往报道的从头算和密度函数理论计算结果不同。在各自由基阳离子的B3LYP构型上，进行了B3LYP、MP2及MRSDCI方法的超精细偶合常数计算，得到了比以往更好的结果，特别是MP2/B3LYP计算值是至今与实验值符合得最好的理论计算结果。     

碱金属离子改性对纳米HZSM-5沸石丁烯裂解催化性能的影响

利用NH3-TPD表征和小型固定床反应评价研究了不同碱金属离子浸渍改性对纳米HZSM-5沸石的酸度及混合碳四液化气中丁烯催化裂解性能的影响。结果表明,尽管锂、钠、钾改性在达到最佳乙烯和丙烯选择性时对应的负载量不同,但其最佳乙烯和丙烯选择性为50％～60％。碱金属离子改性催化剂在连续运转过程中其催化活性缓慢下降,但乙烯和...     

异丁烷-丁烯在磷钨酸柱撑水滑石上的烷基化反应

层状化合物;异丁烷-丁烯在磷钨酸柱撑水滑石上的烷基化反应     

MCM-22分子筛的酸性及在1-丁烯骨架异构化反应中的催化性能

 采用XRD,NH3-TPD及氘代乙腈吸附FT-IR等技术表征了静态水热合成法合成的MCM-22分子筛的晶相结构和酸性. 根据表征结果,Si/Al比为15和30的两个样品均为高纯度的MCM-22分子筛; 两个样品的Brnsted酸量基本相同,但Si/Al为15的样品上含有相对较高的Lewis酸量. MCM-22分子筛上1-丁烯骨架异构化反应的结果表明,Si/Al为30的样品具有较高的异丁烯选择性(74.8%)和稳定性, 而Si/Al为15的样品中存在的含量较高的Lewis酸位可能是导致异丁烯选择性(65.5%)下降的主要原因.     

杂原子取代型磷酸铝分子筛上丁烯异构化反应

采用水热法合成了Si、Zr杂原子取代的磷酸铝分子筛（APO-11）.研究发现,它们(SAPO-11、ZAPO-11)与APO-11分子筛骨架结构相同（AEL型）；三者表面形貌不同,SAPO-11与APO-11分子筛同为球形颗粒,而ZAPO-11则为棒状晶粒.杂原子的取代能改变APO-11分子筛的酸性质以及微孔分布.反应评价显示,异构化活性SAPO-11>> ZAPO-11 > APO-11；其中SAPO-11分子筛,当Si/Al=0.15时,异构化性能最佳.异构化反应的因子（时间、分压、温度）系统考察发现,主要副产物C3、C5＋与i-C4=的浓度呈现不同的变化趋势,从而证实丁烯选择性异构是通过单分子机理实现的,C3、C5＋是通过双分子历程生成的.     

Partial amination of cationic exchange resins and its application in the hydration of butene

In this work,the amination of sulfonated polystyrene resin with alkyl secondary amine is investigated.The catalytic activities of the modified resins are determined through the hydration of 1-butene.The optimum chain length and the best range of amination rate are determined.It is found that the single-pass conversion of 1-butene was raised 2% on average,and the relative activity was increased over 30% after modification.A hypothesis about the enhancement of catalytic activities by the inclusion of alkyl chain to wrap up the butene molecule is proposed.     

Metathesis of 1-butene and 2-butene to propene over Re2O7 supported on macro-mesoporous γ-alumina prepared via a dual template method

Macro-mesoporous γ-alumina support(MMA) was prepared by a sol-gel route in aqueous medium using pseudo-boehmite as aluminum source and polystyrene microspheres and Pluronic P123 as hard and soft dual templates,respectively.MMA had a BET specific surface area of about 259 m2 g-1,total pore volume of about 1.61 cm3 g-1,macropore diameter of about 102 nm,and mesopore diameter of about 14 nm.Re2O7/MMA and conventional Re2O7/Al2O3 were prepared by a incipient-wetness impregnation method,and their catalytic performances in the metathesis of 1-butene and 2-butene were tested in a fixed-bed tubular reactor.The result showed that Re2O7/MMA possessed higher activity and far longer working life-span than conventional Re2O7/Al2O3.