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本文介绍有关过氧化氢的催化氧化反应,并重点介绍了其反应过程中的各种催化剂载体的研究进展,比如硅胶、分子筛、活性炭等载体。 相似文献
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以脱氢枞胺(DHA)与Keggin型磷钨酸(HPW)反应制备脱氢枞胺磷钨酸盐(DHPW).运用红外光谱、紫外光谱对其结构进行表征,并以催化H2O2氧化1-辛烯为探针反应,考察脱氢枞胺磷钨酸盐的催化性能。结果表明,脱氢枞胺磷钨酸盐具有氧化-酸双功能催化作用,能催化H202氧化1-辛烯生成1,2-环氧辛烷、1,2-二羟基辛烷和2-羟基辛烷;在无溶剂或极性溶剂中,1,2-环氧辛烷易发生环氧开环水解反应。选择性较低;在非极性溶剂中,1,2-环氧辛烷的选择性较高.在1,2-二氯乙烷用量为5mL、1-辛烯用量为5mmol、催化剂用量为0.075g、H202用量为5.0mmol、反应温度为30℃、反应时间为3h的条件下。1,2-环氧辛烷的选择性最高,达到90.0%。 相似文献
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过氧化氢氧化苯制苯酚的催化剂研究进展 总被引:1,自引:0,他引:1
综述了过氧化氢直接氧化苯制苯酚过程中相关催化剂的研究进展,重点介绍了ZSM系列和TS系列催化剂、含铁和含铜催化剂以及钒取代杂多酸盐催化剂,同时给出了各种催化剂所达到的收率和选择性;最后探讨了这些新型催化剂的工作应用前景以及今后研究的方向。 相似文献
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过氧化氢氧化苯甲醛反应的研究 总被引:10,自引:0,他引:10
研究了在无催化剂及以硫酸铜、金属铜、浓硫酸为催化剂的不同条件下,过氧化氢对苯甲醛的氧化反应。考察了苯甲醛和过氧化氢的摩尔投料比、温度、浓硫酸用量和反应时间对反应的影响.结果表明:温度60℃、反应时间36h、加浓硫酸2滴(以25mL苯甲醛为基准)、投料比为2时,苯甲酸的产率可达86.5%。 相似文献
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含甲醛废水的过氧化氢湿式氧化及其反应动力学 总被引:7,自引:0,他引:7
在连续流釜式反应器中,以过氧化氢为氧化剂,辅以温度和压力,研究了湿式氧化法处理甲醛模拟废水的工艺条件:过氧化氢供氧量为废水理论需氧量的110%时为宜;160~180℃为甲醛湿式氧化的适宜温度范围;甲醛初始浓度在480~1500mgL-1范围内能保持较高的去除率。建立了该反应的指数型经验动力学模型方程,得出基于甲醛和COD的表观活化能分别是38.67kJmol-1和53.02kJmol-1。 反应产物的紫外光谱分析表明中间产物甲酸的进一步氧化是甲醛彻底降解的限速步骤。 相似文献
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A practical ruthenium phase‐transfer catalyst (Ru‐PTC) system for the oxidation of naphthalene derivatives has been developed. Substituted 1,4‐quinones are obtained in good selectivity and yield in water without the addition of any organic solvent and acid. By applying the optimized conditions the feed additive menadione (vitamin K3) is obtained from 2‐methylnaphthalene with 64 % yield and 73 % selectivity. 相似文献
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采用溶胶固定法制备了一系列的Au/C纳米催化剂,进行了透射电镜(TEM)表征,用于常压下以氧气为氧化剂碱性溶液中葡萄糖氧化制备葡萄糖酸钠,并对最佳的催化剂进行了反应条件影响考察。结果显示,使用溶胶固定法制备的质量分数为1%的Au/C催化效果最佳,纳米金颗粒直径小于2 nm且分布均匀,其较佳反应条件为50℃,pH 9.5,氧气流量40 mL/min,催化剂0.22 g,水溶液中质量分数为7.5%的葡萄糖,葡萄糖在1 h内,选择性及转化率均可同时达到100%,反应的转化频率(Turnover Frequency,TOF)高达1 560 h-1。上述研究表明溶胶固定法能制备一定纳米金颗粒大小的Au/C催化剂,且在该多相催化剂上反应时间短,活性高,选择性高。 相似文献
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CalogeroG. Piscopo Stefan Loebbecke Raimondo Maggi Giovanni Sartori 《Advanced Synthesis \u0026amp; Catalysis》2010,352(10):1625-1629
Silica‐supported propylsulfonic acid is a very good heterogeneous catalyst for the Baeyer–Villiger oxidation of cyclic ketones to lactones with stoichiometric 30% aqueous hydrogen peroxide in 1,1,1,3,3,3‐hexafluoro‐2‐propanol as solvent. 相似文献
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综述了醛、酮在过氧化氢做为氧化剂的条件下的Baeyer-Villiger氧化。介绍了环境友好型氧化剂过氧化氢在不同催化剂的催化下对醛、酮的Baeyer-Villiger氧化。 相似文献
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The paper presents results of phenol oxidized under the conditions of high temperature created during collapse of cavitation bubbles.The degradation efficiency has been greatly improved by using cavitation water jets combined with H2O2 as demonstrated in laboratory tests.Various factors affecting phenol removal ratio were ex-amined and the degradation mechanism was revealed by high performance liquid chromatography(HPLC).The re-sults showed that 99.85% of phenol was mineralized when phenol concentration was 100 mg·L-1 with pH value of 3.0,H2O2 concentration of 300 mg·L-1,confining pressure of 0.5 MPa,and pumping pressure of 20 MPa.The in-termediate products after phenol oxidation were composed of catechol,hydroquinone and p-benzoquinone.Finally,phenol was degraded into maleic acid and acetic acid.Furthermore,a dynamic model of phenol oxidation via cavi-tation water jets combined with H2O2 has been developed. 相似文献
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The performance of UV/H2O2, UV/O3, and UV/H2O2/O3 oxidation systems for the treatment of municipal solid-waste landfill leachate was investigated. Main objective of the experiment was to remove total organic carbon (TOC), non-biodegradable organic compounds (NBDOC) and color. In UV/H2O2 oxidation experiment, with the increase of H2O2 dosage, removal efficiencies of TOC and color along with the ratio of biochemical oxygen demand (BOD) to chemical oxygen demand (COD) of the effluent were increased and a better performance was obtained than the system H2O2 alone. In UV/H2O2 oxidation, under the optimum condition H2O2 (0.2 time), removal efficiencies of TOC and color were 78.9% and 95.5%, respectively, and BOD/COD ratio was significantly increased from 0.112 to 0.366. In UV/O3 oxidation, with the increase of O3 dosage, removal efficiencies of TOC and color along with BOD/COD ratio of the effluent were increased and a better performance was obtained than the system O3 alone. Under the optimum condition UV/O3 相似文献