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- On the other hand, both Br? nsted and Lewis acid sites are observed on PW/USY catalysts. 由于PW与USY孔壁的弱相互作用，PW和USY的酸性中心得到保存，PW/USY催化剂的酸量较USY和PW有较大提高，其表面同时存在B（Br?nsted）酸和L（Lewis）酸中心。
- To optimize the process of prepartion isorotenone from rotenone by using Lewis acid AlCl3 as catalyst. 为了优化鱼藤酮异构化制备异鱼藤酮的工艺。采用三氯化铝催化下异构化。
- There existed both Lewis acid sites(Fe~(3+),Mo~(6+)) and Lewis base sites(oxygen of Mo=O and Mo-O-Fe bond) on the surface of the catalysts. 催化剂表面由Lewis碱位(MoO键的端氧和Fe-O-Mo键中的桥氧)及Lewis酸位构成。
- Trimethylsilyl cyclopropyl ethers can react with the silica gel to form the cyclopropanols when Lewis acid such as ZnX2 existed. 环丙烷基硅醚在卤化锌的作用下能够与硅胶反应生成环丙基醇。
- Researches in and application of Lewis acid,Bronsted acid,alkali, alkaline earth and molecular sieve catalysts were described in detail. 对采取烷基化法和酰基化法合成2,6-二烷基萘的工艺路线,尤其对所使用催化剂的研究进展进行了评述。
- Researches in and application of Lewis acid, Bronsted acid, alkali, alkaline earth and molecular sieve catalysts were described in detail. 对采取烷基化法和酰基化法合成2,6-二烷基萘的工艺路线，尤其对所使用催化剂的研究进展进行了评述。
- Acetylation between alcohol and benzoyl oxide was carried out using ZnBr2 as a Lewis acid catalyst in solvent-free condition. Some structures were characterized by NMR and IR. 以溴化锌为催化剂，在无溶剂条件下实现了醇与苯甲酸酐的酰化反应，部分产物经NMR和ir表征。
- The results indicated that the composite oxide composition influences its acid characteristics that TS?1 has higher Br?nsted acid sites and TS?4 has higher Lewis acid sites. 实验结果表明;TS系列载体随组成不同;其酸性特征也不一样;TS 1具有较多的B酸位;而TS 4则具有较强的L酸.
- FePO 4 and AlPO 4 distribute at intervals, and there exist Lewis base sites (P=O and P-O-Fe) and Lewis acid sites (Fe 3+ and Al 3+) on the catalyst surface. FePO4 和AlPO4 间隔分布在催化剂表面 ;形成Lewis碱位 (P =O ;P O Fe)和Lewis酸位 (Fe3 + ;Al3 + ) .
- The hydrolysis of phosphate experiences a bifunctional catalytic mechanism including double Lewis acid activation and intramolecular nucleophilic attack. 磷酸酷的水解经历了双Lewis酸活化和分子内亲核进攻的催化机理。
- In this paper,the curing property of benzoxazine precursors based on bisphenols/Novolak resin,which were catalyzed by hexamine ,Oxalic acid,Lewis acid etc. 利用DSC、TGA等测试方法，研究了双酚型苯并恶嗪中间体（中间体）／线型酚醛树脂（线酚），在六次甲基四胺（六次）、草酸和路易斯酸作用下的固化性能以及固化物的热稳定性。
- The results on synthesis of tetracosene (C 24 olefins)by dimerization with a complex composed of Lewis acid (L) and complexing agent A as catalyst are reported. 研究以L酸和络合剂A配制的络合物为催化剂，用于四聚丙烯齐聚制备二十四碳烯。
- The kinetic analysis illustrates that the hydrolysis of phosphomonoester experiences a bifunctional catalytic process including double Lewis acid activation and intramolecular nucleophilic attack. 动力学分析表明，磷酸单酯的催化水解经历了双路易斯酸活化和分子内亲核进攻的双功能催化机理。
- Alkylation of benzene with 1-hexene in chloroaluminate ionic liquids with Lewis acidity was investigated. The ionic liquids acting as catalysts were prepared from emimBr, bmimBr, Et_3NHCl, C_4H_9NBr,C_ 19H_ 42BrN and aluminium chloride. 以溴化 1 -乙基 - 3 -甲基咪唑 (emim Br) ,溴化 1 -丁基 - 3 -甲基咪唑 (bmim Br) ,盐酸三乙胺 (Et3NHCl) ,溴化四丁基铵 (C4 H9NBr) ,十六烷基三甲基溴化铵 (C19H4 2 Br N)分别与 Al Cl3原位合成法制备离子液体催化体系。
- This thesis focuses on ring-opening reactions of aziridines with various nucleophiles catalyzed by organocatalysts or Lewis acids. 本论文主要研究了氮杂环丙烷化合物的若干转化反应，侧重于有机小分子催化下各类亲核试剂对之的开环反应研究。
- Lewis acid catalyzed acetylation of steroidal sapogenin was reinvestigated, and the previous assigned structures A, B and C of E/F ring opening products were rectified as 1, 2 and 3 according to X ray diffraction analysis. 重新研究了Lewis酸催化的甾体皂甙元E/F螺环乙酰化开环反应;并通过波谱分析和单晶X衍射修正了原指定结构.
- The guest speaker will be our old friend John Lewis. 特邀演讲者将是我们的老朋友约翰。路易斯。
- The experimental results pointed out that the three kinds of active sites exist on the surface of the catalysts: Metallic site Cu, Lewis acid sites V~(5+) and Ti~(4+), Lewis base sites bridge O in V-O-Ti and terminal O in V=O. 实验结果表明:在Cu/V2O5-TiO2催化剂表面存在金属位Cu、Lewis酸位V5+和Ti4+以及Lewis碱位V-O-Ti的桥氧和V=O的端氧三类活性中心;
- He was now in the measures of Lewis XIV. 他此刻正与路易十四共商大计。
- Exprimental results showed that bothBronsted acid and Lewis acid were essential in the reactions, while the hydration of propylenewas catalyzed by Bronsted acid and the formation of diisopropyl et... 丙烯水合生成异丙醇的反应主要在B酸位上进行;而强酸部分的L酸位对二异丙基醚的生成起着主要作用.
