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Effect of phosphomolybdic acid on the catalytic behavior of bifunctional Pt‐Cr/nanocrystalline Y zeolite in hydroisomerization of n ‐octane
Author(s) -
Afzali Zahra,
Vaezi Mohammad Reza,
Aghabarari Behzad,
Martinez Huerta Maria Victoria
Publication year - 2020
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201800475
Subject(s) - chemistry , bifunctional , nanomaterial based catalyst , phosphomolybdic acid , zeolite , catalysis , nanocrystalline material , yield (engineering) , nuclear chemistry , scanning electron microscope , bet theory , octane , chemical engineering , organic chemistry , materials science , crystallography , metallurgy , composite material , engineering
In this study, Y zeolite nanocrystals were synthesized without an organic template and were used as a support for bifunctional nanocatalysts in the hydroisomerization of n ‐octane. Different types of catalysts were synthesized by loading Pt, Cr, and phosphomolybdic acid (HPMo) on Y zeolite nanocrystal supports and were characterized by X‐ray diffraction (XRD), Brunauer–Emmett–Teller (BET), field emission scanning electron microscope (FE‐SEM), and transmission electron microscope (TEM) analysis. The Cr‐Pt/HPMo‐Y nanocatalyst with a surface area of approx. 600 m 2 /g showed the best performance in the hydroisomerization of n ‐octane. The optimization of n ‐octane hydroisomerization over bifunctional nanocatalysts supported on nanocrystalline Y zeolite, in the presence of H 2 gas, was applied based on the response surface methodology (RSM) and Box–Behnken design (BBD) template. The effect of three different process variables on the yield of iso‐alkanes as the purpose process was determined. Experiments were carried out using a fixed‐bed microreactor under different ranges of weight hourly space velocity (WHSV) ( A = 0.5–1.5 hr −1 ), H 2 to n‐C 8 molar ratio ( B = 1:1–3:1), and reaction temperature ( C = 200–300°C). The RSM proved that the temperature variable had the greatest impact on the hydroisomerization reaction yield.