共查询到18条相似文献,搜索用时 104 毫秒
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杂原子MCM-41分子筛的合成及对环己烷氧化的研究 总被引:6,自引:0,他引:6
用十六烷基三甲基溴化铵为模板剂,水玻璃为硅源,在合成过程分别加入Cr3+、Co2+、Fe3+杂原子,在150℃晶化48h,水热合成了Cr-MCM-41、Co-MCM-41、Fe-MCM-41等杂原子分子筛。考察了时间、温度、催化剂用量、过氧化氢用量及催化剂再生等因素对环己烷氧化反应的影响。最佳反应条件为:温度100℃;环己烷30mmol,Cr-MCM-41为催化剂,用量0 12g;n(H2O2)/n(C6H12)=1;反应时间16h,环己烷的转化率可达28 6%,产物的酮醇摩尔比为1 89。 相似文献
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分别考察了反应温度、过氧化氢用量及加入方式等因素对Cr、Fe和Ce改性后的杂原子MCM-41分子筛催化剂液相催化氧化环己烷制取环己酮反应的影响。研究结果表明,Cr-MCM-41〖JP〗催化剂具有较好的催化活性。选择适当的反应温度、过氧化氢用量和加入方式可以有效提高环己烷转化率和过氧化氢利用率。在70 ℃和n(C6 H12)∶n(H2O2)=1∶2条件下,采用两次加入过氧化氢的方式,环己烷转化率为33.7%,酮醇总选择性97.2%,n(环己酮)∶n(环己醇)=1.99,过氧化氢利用率37.1%。 相似文献
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介绍了目前环己烷氧化制备环己酮的主要生产工艺和工艺改进情况;同时对最新环己酮合成方法进行了介绍,并对环己酮制备工艺的发展进行了展望。 相似文献
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环己烷氧化制环己酮工艺及研究进展 总被引:17,自引:0,他引:17
详细介绍了环己烷氧化制环己酮的生产工艺,以及钴盐催化法、硼酸催化法的改进情况,同时,还介绍了近年来环己烷氧化制环己酮的研究进展。 相似文献
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Synthesis of FeCoMnAPO-5 Molecular Sieve and Catalytic Activity in Cyclohexane Oxidation by Oxygen 总被引:4,自引:0,他引:4
A new FeCoMnAPO-5 with AFI structure was synthesized under hydrothermal conditions and characterized by XRD, FT-IR, X-ray fluorescence, nitrogen adsorption and SEM. The oxidation of cyclohexane with molecular oxygen was studied over the catalyst at 403 K. It show d higher activity compared to FeAPO-5, CoAPO-5 and MnAPO-5. The FeCoMnAPO-5 catalyst was recycled twice without loss of activity or selectivity. 相似文献
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Synthesis of a CrCoAPO-5(AFI) Molecular Sieve and Its Activity in Cyclohexane Oxidation in the Liquid Phase 总被引:2,自引:0,他引:2
A new CrCoAPO-5 was synthesized under hydrothermal conditions, characterised by X-ray diffraction, scanning electron microscopy, infrared spectroscopy, energy dispersive X-ray analysis, thermogravimetric analysis, electron paramagnetic resonance and nitrogen physisorption. The CrCoAPO-5 showed catalytic activity in the liquid phase oxidation of cyclohexane at 115°C and 1 MPa of oxygen. 相似文献
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采用两步法合成了两类共18种金属席夫碱配合物,将其用于催化环己烷的氧化反应。结果表明:金属席夫碱配合物在温和条件下能有效催化环己烷的反应,生成目的产物;双核金属席夫碱催化效果较单核好。 相似文献
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环己烷催化氧化催化剂的研究进展 总被引:1,自引:0,他引:1
综述了国内外环己烷选择性氧化催化剂的研究进展,对目前环己烷氧化所用催化剂体系进行了总结及比较分析,重点介绍了分子筛催化剂体系中TS-1、MCM、SBA-15等分子筛催化体系. 相似文献
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从合成方法、特性和应用三个方面综述了介孔磷酸铝分子筛(AlPO4)的国内外研究进展,分析了水热或溶剂热在合成介孔AlPO4分子筛工艺上的特点,介绍了介孔AlPO4分子筛的结构组成和在化工领域中的一些应用。 相似文献
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Hong Zhao Jicheng Zhou Hean Luo Chuyi Zeng Dehua Li Yuejin Liu 《Catalysis Letters》2006,108(1-2):49-54
Nano-scale silver supported mesoporous molecular sieve Ag/MCM-41 was directly prepared by one-pot synthesis method. The prepared
sample was characterized by XRD, TEM, and N2 sorption. The results showed that the sample of Ag/MCM-41 had no appreciable incorporation of silver into the mesoporous
matrix of MCM-41 with good crystallinity, and silver nanoparticles were dispersed inside or outside of the channels in the
mesoporous host. The catalytic performance of the sample for the cyclohexane liquid-phase oxidation into cyclohexanone and
cyclohexanol by oxygen in the absence of solvents without inducing agents was investigated. The 83.4% selectivity to cyclohexanol
and cyclohexanone at 10.7% conversion of cyclohexane was obtained over Ag/MCM-41 catalyst at 428 K for 3 h. The turn over
numbers (TONs) of Ag/MCM-41 was up to 2946. The catalytic activity of Ag/MCM-41 was also compared with Ag/TS-1 as well as
Ag/Al2O3. The results indicated that Ag/MCM-41 showed superior activity to both Ag/TS-1 and Ag/Al2O3. A calcined Ag/MCM-41 was found to be an efficient catalyst for the cyclohexane oxidation into cyclohexanol and cyclohexanone
using oxygen as oxidant. 相似文献