Catalytic cracking of naphtha: The effect of Fe and Cr impregnated ZSM-5 on olefin selectivity

IF 0.125

Applied Petrochemical Research Pub Date : 2018-05-04 DOI:10.1007/s13203-018-0200-2

Ebrahim Mohiuddin, Masikana M. Mdleleni, David Key

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引用次数: 23

Abstract

This study focuses on the modification of ZSM-5 in order to enhance the catalytic cracking of refinery naphtha to produce light olefins. ZSM-5 was metal modified using different loadings (0.5–5?wt%) of Fe and Cr via the impregnation method. The metal modified ZSM-5 samples are compared and the effect of metal loading on the physicochemical properties and catalytic performance is investigated. Fe and Cr modification had an effect on both the physicochemical properties of the catalysts as well as catalytic activity and selectivity. Metal loading caused a decrease in the specific surface area which decreased further with increased metal loading. Fe had a greater effect on the total acidity in particular strong acid sites when compared to Cr. The optimum Fe loading was established which promoted selectivity to olefins, in particular propylene. Fe also had a dominant effect on the P/E ratio of which a remarkable ratio of five was achieved as well as enhanced the stability of the catalyst. Cr was found to be a good promoter for selectivity to BTX products with a two-fold increase observed when compared to Fe-modified catalysts.

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石脑油催化裂化:Fe和Cr浸渍ZSM-5对烯烃选择性的影响

对ZSM-5进行了改性，以提高炼油石脑油催化裂化制取轻质烯烃的性能。通过浸渍法对ZSM-5进行了不同Fe和Cr含量(0.5 - 5.5 wt%)的金属改性。比较了金属改性的ZSM-5样品，研究了金属负载对ZSM-5的理化性能和催化性能的影响。Fe和Cr改性对催化剂的理化性质、催化活性和选择性都有影响。金属载荷导致比表面积减小，比表面积随金属载荷的增加而进一步减小。与Cr相比，Fe对特定强酸位点的总酸度影响更大。确定了铁的最佳负载，提高了对烯烃的选择性，特别是对丙烯的选择性。Fe对P/E也有显著的影响，达到了5的显著比率，并增强了催化剂的稳定性。Cr是一种很好的BTX产物选择性促进剂，与fe修饰的催化剂相比，其选择性提高了两倍。

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来源期刊

Applied Petrochemical Research ENGINEERING, CHEMICAL-

自引率

0.00%

发文量

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.