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首页> 外文会议>ACS National Meeting Exposition >IMPROVING THE ACCESSIBILITY OF FISCHERTROPSCH CATALYST LAYERS BY INSERTION OF TRANSPORT PORES
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IMPROVING THE ACCESSIBILITY OF FISCHERTROPSCH CATALYST LAYERS BY INSERTION OF TRANSPORT PORES

机译：通过插入输送孔来改善Fischer Tropsch催化剂层的可达性

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Fischer-Tropsch (FT) synthesis for production of long chained hydrocarbons is typically conducted on cobalt based catalysts. The activity of the catalysts increases with rising metallic surface area. This is achieved by use of catalyst supports such as alumina, silica or zirconia which provide high surface areas1. The resulting small pores inside the catalyst are filled with liquid products during reaction and thereby the diffusivity is considerably reduced compared to the gas phase. This limits the utilizable diffusion length, which is a key parameter for reactor design considering pressure drop2 and catalyst content in the reactor3. Increasing the diffusion length allows the use of larger catalyst particles, leading to lower pressure drop. For wall coated channel reactors the reactor productivity can be improved as the thickness of efficiently utilized catalyst increases. To obtain a higher productivity, catalyst layers with additionally introduced transport pores could be used4. Transport pores enhance the internal mass transport but also reduce the active catalyst mass per catalyst layer volume. These opposed tendencies demand the optimization of the ideal fraction of additional pores inside the catalyst. Both the catalyst properties and the FT synthesis conditions may have impact on this optimum. Aim of the present work is to evaluate the influence of these parameters on the achievable improvement by means of modeling and simulation.
机译：用于生产长链烃的Fischer-Tropsch（FT）合成通常在基于钴基催化剂上进行。催化剂的活性随着金属表面区域的上升而增加。这是通过使用提供高表面积1的氧化铝，二氧化硅或氧化锆等催化剂载体来实现的。在反应过程中催化剂内填充催化剂内的小孔，从而与气相相比，扩散率显着降低。这限制了可利用的扩散长度，这是考虑反应器3中的压力下降2和催化剂含量的反应器设计的关键参数。增加扩散长度允许使用较大的催化剂颗粒，导致较低的压降。对于壁涂覆的通道反应器，随着有效利用催化剂的厚度增加，可以提高反应器生产率。为了获得更高的生产率，可以使用具有另外引入的传送孔的催化剂层。运输孔增强内部传质，但也减少了每种催化剂层体积的活性催化剂质量。这些反对趋势要求优化催化剂内的额外孔的理想分数。催化剂性质和FT合成条件都可能对该最佳影响产生影响。目前工作的目的是通过建模和模拟评估这些参数对可实现的改进的影响。

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