Fe_3O_4-xTiO_2复合光催化剂的制备及其对染料废水的处理效果

采用共沉淀法制备了复合光催化剂Fe_3O_4-xTiO_2。运用XRD、SEM、TEM和UV-Vis DRS等技术对光催化剂进行了表征,并考察了其在太阳光下对茜素红模拟染料废水的光催化降解活性。实验结果表明,当TiO_2与Fe_3O_4的质量比为0.75、初始溶液p H为3.0时,茜素红去除率最高,光催化反应120 min后,茜素红去除率为100%。表征结果显示,Fe_3O_4-0.75TiO_2复合光催化剂不是核壳结构,而是Fe_3O_4和TiO_2的聚集体。Fe_3O_4-0.75TiO_2复合光催化剂重复使用5次后茜素红去除率几乎没有下降,活性稳定性极佳。     

微量Pd对CrOx／ZrO2催化剂催化活性的影响

运用微反技术考察了ＣｒＯＸ负载型催化剂对ＣＯ＋Ｏ２和ＣＯ＋ＮＯ反应的催化活性。研究了微量Ｐｄ加和ＣｒＯＸ基双组元催化剂对上述反应的催化活性,中间产物Ｎ２Ｏ生成和Ｎ２生成的影响。     

电解氧化法工业废水处理复合催化剂的制备方法

正该专利涉及一种电解氧化法工业废水处理复合催化剂及其制备方法。以磺化聚苯乙烯树脂为载体,以Fe2+,Mn2+,Cr3+,Cu2+为活性组分,采用离子交换法,将各种活性组分分别负载于磺化聚苯乙烯树脂载体上,制得催化剂前体A、催化剂前体B、催化剂前体C和催化剂前体D;取前体各组分混合得到复合催化剂。该复合催化剂催化活性高,活     

TiO2纳米管催化活性再生处理技术简

采用H₂O₂、Fe₂（SO₄）₃和Fenton溶液对失活的TiO₂纳米管进行再生处理,重点考察了3种溶液的浓度和处理时间等对再生效果的影响,初步分析了经处理后TiO₂纳米管催化活性得到再生或增强的机理。结果表明,经H₂O₂溶液处理后TiO₂催化活性能得到有效再生,经Fe₂（SO₄）₃和Fenton溶液处理后其催化活性不仅得到再生,还能显著增强,这与H₂O₂和Fenton的强氧化作用,及进入TiO₂纳米管的Fe³⁺的阻止电子-空穴对再复合作用有关。     

网络版论文摘要

掺钇纳米TiO2催化活性的研究;污泥与煤混合成浆特性初探;UV／Fenton法处理化纤废水反应条件的优化研究;改性高岭土复合光催化剂降解亚甲基蓝的研究.     

磺化石油焦酸催化剂的制备

以石油焦为原料、浓硫酸为磺化剂,通过磺化反应制得磺化石油焦酸催化剂。分析了制备条件的影响,获得了制备磺化石油焦的优化条件：反应温度120℃、反应时间30h、酸（摩尔）焦（g）比0．8mol／g。在优化条件下,磺化石油焦的交换容量可达2．6mmol／g。与强酸性阳离子交换树脂K2641相比,在相同的反应条件下,磺化石油焦作为酸催化剂催化合成乙酸乙酯表现出较高的催化活性,且重复使用5次后催化剂活性基本保持不变。     

TiO2纳米管催化活性再生处理技术

采用H2O2、Fe2（SO4）3和Fenton溶液对失活的TiO2纳米管进行再生处理,重点考察了3种溶液的浓度和处理时间等对再生效果的影响,初步分析了经处理后TiO2纳米管催化活性得到再生或增强的机理。结果表明,经H2O2溶液处理后TiO2催化活性能得到有效再生,经Fe2（SO4）3,和Fenton溶液处理后其催化活性不仅得到再生,还能显著增强,这与H2O2和Fenton的强氧化作用,及进入TiO2纳米管的Fe3＋的阻止电子．空穴对再复合作用有关。     

Catalytic wet air oxidation of phenol with functionalized carbon materials as catalysts：Reaction mechanism and pathway

The development of highly active carbon material catalysts in catalytic wet air oxidation（CWAO）has attracted a great deal of attention. In this study different carbon material catalysts（multi-walled carbon nanotubes,carbon fibers and graphite） were developed to enhance the CWAO of phenol in aqueous solution. The functionalized carbon materials exhibited excellent catalytic activity in the CWAO of phenol. After 60 min reaction,the removal of phenol was nearly100% over the functionalized multi-walled carbon,while it was only 14% over the purified multi-walled carbon under the same reaction conditions. Carboxylic acid groups introduced on the surface of the functionalized carbon materials play an important role in the catalytic activity in CWAO. They can promote the production of free radicals,which act as strong oxidants in CWAO. Based on the analysis of the intermediates produced in the CWAO reactions,a new reaction pathway for the CWAO of phenol was proposed in this study. There are some differences between the proposed reaction pathway and that reported in the literature. First,maleic acid is transformed directly into malonic acid. Second,acetic acid is oxidized into an unknown intermediate,which is then oxidized into CO2 and H2O. Finally,formic acid and oxalic acid can mutually interconvert when conditions are favorable.     

N2O decomposition over K/Na-promoted Mg/Zn-Ce-cobalt mixed oxides catalysts

Three groups of cobalt mixed oxide catalysts（Mg/Zn-Co, Mg/Zn-Ce-C, K/Na-Mg/Zn-Ce-Co）were prepared by sol-gel or impregnation methods. The synergistic effects of transition metal, rare earth metal and alkali metal on cobalt mixed catalysts for nitrous oxide（N2O）decomposing to N2 and O2were investigated. The experimental results revealed that the catalytic activity for N2 O decomposition was promoted as Co2＋was replaced partially by Zn2＋/Mg2＋, moreover, the characterization analysis by XRD and XPS showed that Zn2＋/Mg2＋replaced Co2＋successfully into the spinel structure of Co3O4 and promoted significantly the catalytic activity. Especially, the addition of CeO2 and K2O/Na2O decreased the binding energy and resulted in an increase in the density of the electron cloud around Co and an improvement of the catalytic activity. Of the investigated cobalt mixed catalysts, the best catalytic activity was shown by 2% K-Zn0.5-Ce0.05-Co catalyst.     

钙钛矿型四效催化剂净化柴油烟气的研究现状

柴油烟气中的污染物对环境造成重大污染,给人类健康造成重大威胁。为了缓解这一现象,广大研究者对柴油烟气排后处理技术开展了针对性研究。结果表明:钙钛矿型四效催化技术是控制排放效果最好和前景最好的排后处理技术之一,不同的钙钛矿型催化活性组分和催化剂载体对四效催化剂的净化效果有着显著的影响。最后探讨了钙钛矿型四效催化技术存在的问题和未来的发展趋势。