催化氧化-SBR法处理高浓含酯废水研究

采用曝气-催化氧化-SBR工艺对富含乙酸乙酯废水进行了处理,并确定了最佳实验室参数。实验表明,该组合工艺可有效地去除废水中所含高浓度乙酸乙酯,出水COD<150mg/L。     

Liquid-phase catalytic oxidation of smelting-gases containing SO2 in low concentration

In order to approach an applicable method of purifying smelting-gases containing SO₂ in low concentration, the catalytic oxidation of SO₂ in low concentration in smelting-gas, using Mn⁺², Fe⁺² and Zn⁺² in liquid-phase, was performed separately in a foam absorbing column in a copper smelter. The absorption solution, containing metal ions in an optimal proportion according to an orthogonal test, demonstrates an improved purification capability for smelting-gas. When the concentration of H₂SO₄ in the solution rises to 20%, the removal efficiency of SO₂ in smelting-gas can be still maintained above 85%. The method is demonstrably effective for the waste gas treatment at small and mid-scale smelters of non-ferrous metals.     

微电解催化氧化处理对硝基苯胺系列废水

从对硝基氯化苯出发可生产对硝基苯胺、2·6 二氧对硝基苯胺第一系列产品 ,这一生产过程产生的废水色度高 ,难降解 ,污染严重。通过大量实验 ,采用专一的金属催化剂进行微电解催化氧化法进行处理 ,不仅工艺简单 ,成本低 ,出水为无色透明 ,达到排放标准     

废旧塑料催化裂解制备汽油

介绍了由废旧塑料通过热裂解和催化裂解制备汽油的方法,着重介绍了由废旧塑料制得的重油经催化裂解获取汽油的反应装置,催化剂、反应条件,产物分析和可能的反应途径。     

催化超临界水氧化废水处理技术的研究进展

简要介绍了作为反应介质的超临界水的物化性质及超临界水氧化的特点 ,阐述了催化超临界水氧化的一般工艺流程并分析了其过程的影响因素及各影响因素的相互关系 ,归纳了超临界水氧化的催化机理、动力学、水对多相催化反应的影响以及催化剂的研究进展 ,探讨了该项技术发展的前景与趋势     

Selective catalytic reduction of NOx from exhaust of lean-burn engine over Ag-Al2O3/cordierite catalyst

A highly effective Ag-Al₂O₃ catalyst was prepared using the in-situ sol-gel method, and characterized by surface area using nitrogen adsorption, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. The catalyst performance was tested on a real lean-burn gasoline engine. Only unburned hydrocarbons and carbon monoxide in the exhaust were directly used as reductant (without any external reductant), the maximum NO _x conversion could only reach 40% at 450°C. When an external reductant, ethanol was added, the average NO _x conversion was greater than 60%. At exhaust gas temperature range of 350–500°C, the maximum NO _x conversion reached about 90%. CO and HC could be efficiently oxidized with Pt-Al₂O₃ oxidation catalyst placed at the end of SCR converter. However, NO _x conversion drastically decreased because of the oxidation of some intermediates to NO _x again. The possible reaction mechanism was proposed as two typical processes, nitration, and reduction in HC-SCR over Ag-Al₂O₃.     

催化曝气-微电解工艺处理石油炼厂延迟焦化废水的中试研究

对石油炼厂延迟焦化装置废水进行了催化曝气 微电解工艺 1m3/h中试现场试验研究。检验了催化曝气单元和微电解单元的现场效果和影响因素 ,通过与小试所得结果的比较 ,结合电化学、多相流原理对装置的放大效应进行了分析。中试工艺的S2 - 及CODCr总去除率分别达 90 %和 75%以上 ,表现了较强的废水适应性和良好处理效果。     

卷烟烟气N—亚硝胺化合物及其吸附催化降解研究进展

回顾了近几十年国内外卷烟烟气亚硝胺的研究进展,介绍了烟气中亚硝胺的形成机制和对人体损害机理,阐述了烟气中亚硝胺的各种检测方法,并进一步对烟气中亚硝胺的吸附催化降解作了详尽的探讨。     

Catalytic wet air oxidation for the treatment of emulsifying wastewater

The wet air oxidation (WAO) and catalytic WAO(CWAO) of the high strength emulsifying wastewater containing nonionic surfactants have been investigated in terms of COD and TOC removal. The WAO and homogeneous CWAO processes were carried out at the temperature from 433 K to 513 K, with initial oxygen pressure 1.2 MPa. It was found that homogeneous catalyst copper(Cu(NO3)2) had an fairly good catalytic activity for the WAO process, and the oxidation was catalyzed when the temperature was higher than 473K. Moreover, several heterogeneous catalysts were proved to be effective for the WAO process. At the temperature 473 K, after 2h reaction, WAO process could achieve about 75% COD removal and 66% TOC removal, while catalysts Cu/Al2O3 and Mn-Ce/Al2O3 elevated the COD removal up to 86%-89% and that of TOC up to 82%. However, complete elimination of COD and TOC was proved to be difficult even the best non-noble catalyst was used. Therefore, the effluent from WAO or CWAO process need to be further disposed. The bioassay proved that the effluent from WAO process was amenable to the biochemical method.     

催化氧化法处理工业废水的研究进展

对Fenton试剂法、光催化氧化法、电催化氧化法、湿式催化氧化法及其它催化氧化法的研究现状和在工业废水处理中的应用情况作了介绍，并且提出了需要加强研究的方向。