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首页> 外文期刊>Catalysis Today >Catalytic wet oxidation of phenol using membrane reactors: A comparative study with slurry-type reactors
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Catalytic wet oxidation of phenol using membrane reactors: A comparative study with slurry-type reactors

机译：使用膜反应器的苯酚催化湿氧化：与淤浆式反应器的比较研究

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The wet air oxidation of phenol over cerium mixed oxides has been carried in autoclave slurry-type reactor and also in a contactor type membrane reactor to assist about the benefits provided by the employment of the mesoporous top layer of a ceramic tubular membrane as catalyst (Ce mixed oxides) support. The effect of mixed oxide composition and use of Pt as dopant onto the phenol removal rate and selectivity towards mineralization have been studied on both types of reactor. For slurry-type reactors, two different autoclave reactors were used: one mechanically stirred highly pressurized, and the other magnetically stirred containing a porous stainless steel membrane as gas diffuser in an attempt to attain higher gas-liquid interfacial area. The performances of these reactors have been compared under similar reaction conditions (i.e. catalyst loading/liquid volume, temperature, phenol concentration) although the way in which reactants are fed to the reaction vessel (different among each other configuration) is clearly affecting the CWO phenol degradation route. From the catalytic systems studied, Pt doped Ce-Zr mixed oxides exhibit the best reaction performance in spite of the achieved phenol conversion levels are below 50%. For autoclave reactors, the gas feeding to the liquid volume by a membrane diffuser has almost no effect on phenol removal for the reaction conditions tested; whereas the catalytic membrane contactor type reactor clearly outperform autoclave reactor provided with membrane diffuser.
机译：在高压釜浆料式反应器中以及在接触器式膜反应器中已经进行了苯酚在铈混合氧化物上的湿式空气氧化，以协助利用陶瓷管状膜的介孔顶层作为催化剂（Ce混合氧化物）支持。在两种反应器上都研究了混合氧化物的组成以及Pt作为掺杂剂对苯酚去除速率和矿化选择性的影响。对于淤浆型反应器，使用了两种不同的高压釜反应器：一种是机械搅拌的高压反应器，另一种是磁力搅拌的，其中包含多孔不锈钢膜作为气体扩散器，以试图获得更大的气液界面面积。在相似的反应条件下（即催化剂负载/液体体积，温度，苯酚浓度）对这些反应器的性能进行了比较，尽管将反应物进料到反应容器的方式（彼此之间的不同）明显影响了CWO苯酚降解途径。从研究的催化体系来看，尽管已实现的苯酚转化率低于50％，但掺Pt的Ce-Zr混合氧化物仍表现出最佳的反应性能。对于高压釜反应器，在测试的反应条件下，通过膜扩散器进料到液体体积中的气体几乎对苯酚的去除没有影响。而催化膜接触器式反应器明显优于装有膜扩散器的高压釜反应器。

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