共查询到19条相似文献,搜索用时 343 毫秒
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1前言对酯化反应所用催化剂,一般使用强酸,如浓硫酸、浓盐酸等。另外,许多Lewis酸,如三氟化硼、三氯化铝、氯化锌和硅胶等也能促进羰酸提供质子[1]。近年来的研究发现,强酸型阳离子交换树脂亦可用于催化某些酯化过程[2]。L-苯丙氨酸的甲酯化反应,传统... 相似文献
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磺酸型阳离子交换树脂催化合成肉桂酸甲酯 总被引:11,自引:0,他引:11
以磺酸型阳离子交换树脂为催化剂,由肉桂酸和甲醇合成了肉桂酸甲酯。考察了反应条件对酯化反应的影响和树脂的催化稳定性。结果表明,肉桂酸的转化率可达95.5%,且催化剂的性能稳定。 相似文献
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离子交换树脂负载Ni—B无定形合金催化剂的制备与性能 总被引:2,自引:0,他引:2
制备了一种新型离子交换树脂负载的Ni-B无定形合金催化剂.用3种树脂作为催化剂载体,即弱酸型阳离子树脂D152,强酸型阳离子树脂D72及强碱型阴离子树脂D261.用XPS、TEM和ICP等技术对催化剂进行了表征.结果表明,催化剂上镍与带有功能基的载体树脂之间有着很强的相互作用,但其强度与所带的功能基有关.3种催化剂Ni2p3/2的XPS谱图上,NiB/D152催化剂的氧化态峰最小,而NiB/D261的氧化态峰最大.异丙醇脱氢反应活性实验证实了这一结果. 相似文献
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以乙醇和乙酸的酯化作为反应模型,考察固体酸催化剂阳离子交换树脂、SO42-/ZrO2和分子筛在微波加热条件下的酯化活性。结果表明,三类固体酸催化剂的活性顺序为Amberlite树脂﹥SO42-/ZrO2﹥HZSM-5,催化剂活性与酸度一致;酯化反应中水的含量对催化剂的活性有不同程度的影响,水含量较高时催化剂SO42-/ZrO2酯化活性明显变差,而阳离子交换树脂仍具有较高的酯化活性。采用阳离子交换树脂对生物油进行微波催化酯化提质后,原生物油中含有的大量不同种类的羧酸被有效地转化成各种酯类,酯类化合物由原油中的4种增加到13种。与传统加热条件下生物油催化提质比较,生物油微波提质具有明显优势,提质后生物油组分得到优化。 相似文献
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离子交换树脂固载SnCl4:合成,表征和酯化反应 总被引:2,自引:0,他引:2
均相催化剂的固载化,由于具有独特属性,近年来发展很快.我们在用高分于材料固载路易斯酸的研究中,发现固载在离子交换树脂的路易斯酸催化性能非常稳定.本文将空气中强烈水解,且腐蚀性很强的四氯化锡与大孔苯乙烯系阳离子交换树脂反应,首次合成了离了交换树脂四氯化锡复合物(以下简写成压IER·SnCl_4),并对IER·SnCl_4的IR、UV光谱性质及在酯化反应中的催化性能进行了研究.结果表明IER·SnCl_4不仅活性高,而且在重复使用性能上表现了突出特点,显示了良好的应用前景. 相似文献
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以732型强酸性阳离子交换树脂为催化剂,在微波辐射下用阿魏酸与乙醇酯化合成了阿魏酸乙酯.通过单因素实验,考察了催化剂活化方法对催化剂活性的影响,结果表明,微波法活化阳离子交换树脂的催化性能好.通过单因素实验和正交实验,考察了催化剂用量、醇酸摩尔比、微波辐射时间、微波辐射功率等因素对反应的影响.确定了最佳反应工艺条件:阿魏酸0.1mol,酸醇摩尔比5:1,催化剂用量为反应物质量的35%,微波功率300w,反应时间30min,产率达84.2%.732型树脂催化剂可再生循环使用,重复使用4次,产率不低于80%. 相似文献
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Yu. V. Popov V. M. Mokhov D. N. Nebykov S. E. Latyshova K. V. Shcherbakova A. O. Panov 《Kinetics and Catalysis》2018,59(4):444-449
The process of dicyclopentadiene hydrogenation in the gas–liquid–solid catalyst system with a catalyst of nickel nanoparticles supported onto a Purolite CT-175 cation exchange resin was studied. The surface structure of the catalyst and the kinetics of the dicyclopentadiene hydrogenation process were examined. Optimum conditions were found for the production of endo-tetrahydrodicyclopentadiene and the simultaneous production of endo-tetrahydrodicyclopentadiene and 5,6-dihydrodicyclopentadiene at atmospheric pressure. 相似文献
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氨基磺酸对酯化反应的催化作用 总被引:4,自引:0,他引:4
氨基磺酸对酯化反应的催化作用张竞清,刘间生(佛山大学化学系佛山528000)关键词氨基磺酸,催化,酯化,乙酸正丁酯氨基磺酸H2NSO3H是一种高稳定性、不吸湿的固体酸[1]。主要用作金属表面处理剂,合金电镀添加剂,织物染色助剂以及硬表面清洗剂等[2]... 相似文献
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Shiue‐Shien Weng Guan‐Ying Lin Hsin‐Chun Li Kuo‐Chen Yang Teng‐Mao Yang Hui‐Chi Liu Syuan‐Hua Sie 《应用有机金属化学》2012,26(9):455-460
A Nafion® resin‐supported oxovanadium(IV) catalyst was readily prepared via ion‐exchange method. This solid vanadyl perfluorinated sulfonate catalyst was used as an efficient and recoverable catalyst for the hydrophosphonylation of various aldehydes under solventless conditions at room temperature. The catalyst could be recovered by simple filtration and reused without a significant loss of activity. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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The macroporosity and acidity of cation exchange resins play a crucial role in the synthesis of dipyrromethanes and porphyrins; for the first time, cation exchange resins have been used as heterogeneous solid acid catalysts to produce dipyrromethanes and porphyrins in good yields. The reaction, at room temperature, of substituted aromatic aldehydes with pyrrole catalysed by cation exchange resin afforded the corresponding meso-substituted dipyrromethane in yields ranging from 70 to 80%, indicating the broad scope of the reaction. Further, the condensation of meso-substituted dipyrromethane with similar or different substituted aromatic aldehydes, using cation exchange resins furnished meso-tetrakis-symmetrical and mixed porphyrins, respectively. One-pot synthesis of porphyrins can also be carried out directly from the aldehydes and pyrrole under the above conditions. Acidolysis of the dipyrromethane is negligible under the conditions of the porphyrin-forming reaction. 相似文献
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Gurusamy Harichandran Savarimuthu David Amalraj Ponnusamy Shanmugam 《Journal of heterocyclic chemistry》2013,50(3):539-543
A facile and efficient one‐pot, solid supported synthesis of functionalized piperidine derivatives catalyzed by Amberlite IRA400‐Cl resin/I2/KI via a multicomponent reaction of various aldehydes, aromatic amines, and 1,3‐dicarbonyl compounds has been achieved. The reaction has been carried out in a one‐pot reaction and Amberlite resin as a solid supported catalyst at room temperature. Shorter reaction time, easy workup, yield, and mild reaction condition make the novel synthetic strategy both practical and attractive. 相似文献