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首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >Hybrid catalysts used in the Catalytic Steam Cracking process (CSC): Influence of the pore characteristics and the surface acidity properties of the ZSM-5 zeolite-based component on the overall catalytic performance
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Hybrid catalysts used in the Catalytic Steam Cracking process (CSC): Influence of the pore characteristics and the surface acidity properties of the ZSM-5 zeolite-based component on the overall catalytic performance

机译：催化蒸汽裂化工艺（CSC）中使用的杂化催化剂：ZSM-5沸石基组分的孔特性和表面酸度性质对整体催化性能的影响

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摘要

Data of the present work show that, in order to obtain high yields in light olefins, the ZSM-5 zeolite - the cracking component of the hybrid catalyst, must have a relatively low SiO2/Al2O3 mol ratio, so that its density of acid sites is high, thus resulting in a high total conversion. Such zeolite must also exhibit relatively mild acidity strength, favouring thus a high propylene/ethylene product ratio. On the other hand, these milder acid sites also lead to a lower coke deposition and thus to a greater on-stream catalyst stability because the cleaning action of the hydrogen spilt-over species is much eased.Feed contamination by trimethylbenzenes is an excellent tool for providing further evidence of the coke cleaning effect by the hydrogen spilt-over species, the latter being generated by the Ni supported co-catalyst. In the case of blending of petroleum hydrocarbon feedstocks with non-oil derived compounds, the latter should not have strong competitive adsorption properties such as those found in polymethylbenzenes (ex: 1,3,5-trimethylbenzene), otherwise rapid fouling phenomena may occur.
机译：当前工作的数据表明，为了在轻质烯烃中获得高收率，ZSM-5沸石（杂化催化剂的裂解组分）必须具有相对较低的SiO2 / Al2O3摩尔比，从而使其酸位密度更高很高，因此总转化率很高。这种沸石还必须表现出相对温和的酸强度，因此有利于高丙烯/乙烯产物比。另一方面，这些较温和的酸位点也导致较低的焦炭沉积并因此提高了在流催化剂的稳定性，因为大大简化了氢溢出物的清洁作用。三甲基苯对进料的污染是一种出色的工具提供了氢溢出物质的焦炭清洁效果的进一步证据，氢溢出物质是由Ni负载的助催化剂产生的。在将石油烃原料与非石油衍生化合物混合的情况下，后者不应具有强竞争性吸附特性，例如在聚甲基苯（例如：1,3,5-三甲基苯）中发现的那样，否则可能会出现快速结垢现象。

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