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通过二甲苯异构催化剂工艺的介绍,寻找出催化剂工业化应用基本流程,从异构化催化剂的工艺原理、异构化生产工艺、异构化生产评价指标介绍了国内异构化催化剂生产工艺,对比了国内在用催化剂的性能,提出了异构化催化剂应用和研究方向的建议。 相似文献
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烷烃异构化是提高汽油辛烷值的重要方法。叙述了C5C6烷烃异构化催化剂的研究现状,介绍双功能催化剂、超强固体酸催化剂以及离子液体催化剂,幵阐述不同金属活性组分、助剂添加剂、载体对异构化催化剂性能的影响。最后对异构化催化剂的収展趋势进行展望,以期为新型C5C6异构化催化剂的研収及应用提供新的思路和借鉴。 相似文献
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文章概述了烯烃骨架异构化催化剂,包括卤化物催化剂、氧化物催化剂和分子筛催化剂。与卤化物催化剂和氧化物催化剂相比,分子筛催化剂表现出了优异的直链烯烃骨架异构化性能。 相似文献
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通过对C_8A异构化催化剂类型和国产异构化催化剂技术指标和特点的介绍,类比了国内在用催化剂的指标,提出了国产催化剂的性能完全可替代进口催化剂。 相似文献
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Hamza Alaşalvar Hakan Erinç Fatma Salur Ayşe Özbey 《Journal of the American Oil Chemists' Society》2019,96(7):839-846
Conjugated linoleic acid (CLA) is commercially produced by alkali isomerization of linoleic acid (LNA). However, this method constitutes a relatively high content of undesirable CLA isomers. In present study, microwave-assisted and ultrasound-assisted alkali isomerization techniques were applied for production of CLA as an alternative to traditional alkali isomerization. This study was aimed to evaluate the isomerization degree of LNA, by using various process conditions such as microwave power, ultrasound amplitude, and their reaction times. The best conditions for LNA isomerization were a microwave power of 700 W and a reaction time of 6 h for microwave-assisted alkali isomerization and an ultrasound amplitude of 100% and a reaction time of 6 h for ultrasound-assisted alkali isomerization. Under determined conditions, microwave-assisted alkali isomerization (97.21%) resulted in a higher isomerization degree compared to ultrasound-assisted alkali isomerization (76.98%) while the content of undesirable CLA isomers in ultrasound-assisted alkali isomerization (0.62%) was lower than that of microwave-assisted alkali isomerization (1.87%). This study showed that application of the both techniques resulted in equal amounts of desirable CLA isomers. The content of desirable CLA isomers was 47.09% cis-9, trans-11 and 48.25% trans-10, cis-12 for microwave-assisted alkali isomerization and 36.34% cis-9, trans-11 and 40.02% trans-10, cis-12 for ultrasound-assisted alkali isomerization. 相似文献
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以直接合成的高硅丝光沸石作异构化催化剂,可以简化目前沸石异构化催化剂生产步骤,提高丝光沸石利用率,降低生产成本。在小型评价装置上,考察直接合成的高硅丝光沸石的异构化性能,并与RISO异构化催化剂进行异构化性能比较,讨论脱铝过程对丝光沸石结构和异构化性能的影响,指出对高硅丝光沸石进行适度脱铝处理,使沸石结构造成缺陷和次级孔的存在,有可能是提高高硅丝光沸石异构化性能的方法。 相似文献
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介绍了异构化工艺制清洁汽油的研究现状,综述了近年来国内外轻石脑油异构化工艺及催化剂的应用与发展。简述了目前国内外主要工业化应用的异构化工艺。从活性金属和载体两方面简单介绍了双功能型金属/酸异构化催化剂的研究与发展。着重阐述了固体超强酸异构化催化剂的特点,详细说明了通过促进剂、载体及活性金属元素的引入等方面对SO42-/ZrO2型固体超强酸异构化催化剂改性方面的研究进展。通过对目前已商业应用的异构化工艺的对比,对异构化催化剂所面临的主要问题进行探讨。最终指出异构化制清洁汽油将成为我国汽油生产的重要技术手段之一,经济、环保、高效的固体超强酸催化剂将大规模工业应用于异构化催化中。 相似文献
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The reversibility of skeletal isomerization between n-butenes and iso-butene has been studied over various solid acid catalysts including ferrierite and ZSM-5 zeolites, mesoporous materials and amorphous alumina in order to identify the cause for their different selectivities for skeletal isomerization. A remarkable selectivity for the reverse skeletal isomerization of iso-butene to n-butenes is found from ferrierite, fluorinated alumina with low fluorine loading and the KIT-1 mesoporous material with low aluminium content; which also demonstrate high selectivity for forward skeletal isomerization. Catalysts that are not selective for forward isomerization exhibit poor selectivity for reverse isomerization. The preference for multimolecular oligomerization due to high concentrations of activated reactants in the pores of nonselective catalysts reduces their selectivity for skeletal isomerization. Thus, the suppression of oligomerization over the selective catalyst makes the cracking of oligomers impossible and increases selectivity. This is achieved by a sparse distribution of activated reactants caused by specific pore structures or low concentrations of strong acid sites. The reversibility of skeletal isomerization and the adsorbed state of butenes are discussed in relation to the monomolecular reaction path. 相似文献
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含固体杂多酸双功能催化剂表现出优异的催化活性,并具有催化反应条件温和、不腐蚀设备、不污染环境等优点.此外,杂多酸基催化剂具有广阔的应用前景,已成为烷烃异构化催化剂领域研究热点.该文综述了杂多酸用于轻质烷烃异构化研究进展,详细论述了负载型杂多酸的载体种类、金属活性组分种类和混合方式等对异构化性能的影响规律.分析了杂多酸基催化剂结构与异构化性能之间的构效关系.提出了今后杂多酸基异构化催化剂的研究方向. 相似文献
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论述了正丁烯骨架异构化活性位的性质、骨架异构化的主导机理和异构催化剂的最新进展。指出正丁烯骨架异构化的主导机理是单分子性的, B ronsted 酸 (OH) 活性位是必需的位点。沸石的形状选择性和沸石类型对催化剂的选择性和稳定性有很大影响。 相似文献