Abstract
Light alkane aromatization for aromatic compound production, used in petrochemical industries is an attractive area of research. The effect of second metal co-impregnation was investigated in stabilizing zinc on ZSM-5 in aromatization of propane. HZSM-5 was modified with zinc and iron metal by co wet-impregnation and characterized using XRF, XRD, BET, N2-adsorption, FTIR, FTIR-Pyridine, SEM, TEM, H2-TPR and XPS. The effect of different loadings of Iron on Zn/ZSM-5 was investigated on acidity, aromatic yield, product distribution and aromatization performance. Performance test was conducted in a fixed bed reactor at 540 °C, one atmosphere. GHSV of 1200 mL/g-h. Co-impregnation of Zn with Fe improved the catalytic activity and aromatic yield for 10 h time on stream as compared to parent HZSM-5 and Zn/ZSM-5 of very low aromatic yield and propane conversion. Impregnation of Zn as the dehydrogenating metal on HZSM-5 steadily increased aromatic yield from 5% on HZSM-5 to 25% and was steadily dropped to 20% after 10 h TOS. The co-impregnation of iron of 1–3 wt% loading as the second metal for zinc stability with 2 wt% Zn on ZSM-5 improved propane conversion and aromatic yield to 55% for the 10 h TOS. This further enhanced aromatic product distribution and minimized light gases.
Highlights
The use of light alkanes as industrial feedstock for petrochemicals and chemical plants has made its studies for aromatization a research interest both in industries and academia
Applied Petrochemical Research (2020) 10:55–65 to diminish or minimize the migration of metallic particles [9,10,11,12,13,14,15,16,17,18,19]. This present study investigated the co-impregnation effect of zinc metal as active site with different loading of iron on ZSM-5 for propane aromatization in fixed bed reactor
This work aimed at studying the effect of the iron second metal co-impregnation with zinc on ZSM-5
Summary
The use of light alkanes as industrial feedstock for petrochemicals and chemical plants has made its studies for aromatization a research interest both in industries and academia. Alkanes alongside other hydrocarbons are found in large deposits in natural gas reservoirs, gas condensate wells and as bye-products of petroleum refining operations. Conversion of propane into higher value chemicals via aromatization is of major importance [1]. ZSM-5 has unique structural pores that favor migration of aromatics due to their similarities in pore size [1,2,3], which enhances its high shape selectivity towards aromatics. Use of parent ZSM-5 as reported in literatures showed high coking and low selectivity towards aromatics as its limitations. Many works have been published towards mitigating this limitation via use of promoters, changing the silica
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