An experimental investigation on effective parameters of batch impregnation systems: a case study on Pt–Sn/Al2O3 catalyst

IF 0.125 Applied Petrochemical Research Pub Date : 2018-02-26 DOI:10.1007/s13203-018-0194-9

Maryam Takht Ravanchi, Shokoufeh Mehrazma, Saeed Sahebdelfar

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Abstract

The adsorption of hexachloroplatinic acid on Sn-impregnated γ-alumina support in the presence of the competitive chloride ion, as a step in preparation of multi-metallic Pt-based catalyst (such as Pt–Sn/Al₂O₃), was studied. The transient adsorption data were obtained by studying the impregnation of Sn/Al₂O₃ with H₂PtCl₆ in an external recycle packed-bed impregnation system. The effect of important parameters such as pH of the impregnating solution, circulation flow rate, and height/diameter ratio of support bed on competitive adsorption was studied. It was observed that upon increasing pH and decreasing circulation rate, the rate of Pt adsorption as well as axial non-uniformity along the bed was increased. On the other hand, a time lag was observed in bulk adsorbate concentration in certain runs which was attributed to deviation from well-mixed contacting pattern being necessary for a uniform catalyst product. This could be minimized by increasing the recycling flow rates and using appropriate amounts of competitive ion concentration.

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间歇浸渍体系有效参数的实验研究——以Pt-Sn /Al2O3催化剂为例

研究了在竞争氯离子存在下，六氯铂酸在锡浸渍的γ-氧化铝载体上的吸附，作为制备多金属pt基催化剂(如Pt-Sn /Al2O3)的一个步骤。通过研究H2PtCl6在外循环填料床浸渍体系中对Sn/Al2O3的浸渍，获得了其瞬态吸附数据。研究了浸渍液pH、循环流量、支撑床高径比等重要参数对竞争吸附的影响。结果表明，随着pH值的增加和循环速率的降低，铂的吸附速率和沿床的轴向不均匀性增加。另一方面，在某些运行中，观察到大块吸附质浓度存在时间滞后，这是由于偏离了均匀催化剂产品所必需的充分混合的接触模式。这可以通过增加循环流量和使用适量的竞争离子浓度来最小化。

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来源期刊

Applied Petrochemical Research ENGINEERING, CHEMICAL-

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0.00%

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审稿时长

13 weeks

期刊介绍： Applied Petrochemical Research is a quarterly Open Access journal supported by King Abdulaziz City for Science and Technology and all the manuscripts are single-blind peer-reviewed for scientific quality and acceptance. The article-processing charge (APC) for all authors is covered by KACST. Publication of original applied research on all aspects of the petrochemical industry focusing on new and smart technologies that allow the production of value-added end products in a cost-effective way. Topics of interest include: • Review of Petrochemical Processes • Reaction Engineering • Design • Catalysis • Pilot Plant and Production Studies • Synthesis As Applied to any of the following aspects of Petrochemical Research: -Feedstock Petrochemicals: Ethylene Production, Propylene Production, Butylene Production, Aromatics Production (Benzene, Toluene, Xylene etc...), Oxygenate Production (Methanol, Ethanol, Propanol etc…), Paraffins and Waxes. -Petrochemical Refining Processes: Cracking (Steam Cracking, Hydrocracking, Fluid Catalytic Cracking), Reforming and Aromatisation, Isomerisation Processes, Dimerization and Polymerization, Aromatic Alkylation, Oxidation Processes, Hydrogenation and Dehydrogenation. -Products: Polymers and Plastics, Lubricants, Speciality and Fine Chemicals (Adhesives, Fragrances, Flavours etc...), Fibres, Pharmaceuticals.