{"title":"Optimized kinetic study of the isomerization reaction over composite catalysts by applying response surface methodology","authors":"Nastaran Parsafard, Behnam Derakhshan","doi":"10.1007/s13738-024-03043-5","DOIUrl":null,"url":null,"abstract":"<div><p>The Pt/HZSM-5-(KCC-1, KIT-6, and SBA-3) catalysts were successfully used for the isomerization reaction of <i>n</i>-heptane. These catalysts were used to optimize this process at response surface methodology combined with central composite design. The effects of temperature, contact time, and flow rates of <i>n</i>-heptane and hydrogen, as some important variables, on the response (reaction rate) were studied. The analysis of variance gave a significant quartic model with good accuracy for estimating the reaction rates for these catalysts. The optimum conditions were obtained for the Pt/HZSM-5-SBA-3 catalyst at a temperature of 350 °C, contact time of 6 h, an H<sub>2</sub> flow rate of 20 cc min<sup>−1</sup> and an <i>n</i>-C<sub>7</sub> flow rate of 2 cc h<sup>−1</sup> with a reaction rate of 5.7 mol g<sup>−1</sup>s<sup>−1</sup>. The modeling results also showed that both the power law and Langmuir–Hinshelwood models agreed with the data obtained from catalytic performance (<i>R</i><sup>2</sup> > 0.9). The results show that the Pt/HZSM-5-SBA-3 catalyst has the lowest activation energy (13.64 kJ mol<sup>−1</sup>) and the highest reaction rate. The reaction order for hydrogen is in the range of − 0.03 to − 0.25 and that for <i>n</i>-C<sub>7</sub> is 0.88–1.19.</p></div>","PeriodicalId":676,"journal":{"name":"Journal of the Iranian Chemical Society","volume":null,"pages":null},"PeriodicalIF":2.2000,"publicationDate":"2024-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the Iranian Chemical Society","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1007/s13738-024-03043-5","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The Pt/HZSM-5-(KCC-1, KIT-6, and SBA-3) catalysts were successfully used for the isomerization reaction of n-heptane. These catalysts were used to optimize this process at response surface methodology combined with central composite design. The effects of temperature, contact time, and flow rates of n-heptane and hydrogen, as some important variables, on the response (reaction rate) were studied. The analysis of variance gave a significant quartic model with good accuracy for estimating the reaction rates for these catalysts. The optimum conditions were obtained for the Pt/HZSM-5-SBA-3 catalyst at a temperature of 350 °C, contact time of 6 h, an H2 flow rate of 20 cc min−1 and an n-C7 flow rate of 2 cc h−1 with a reaction rate of 5.7 mol g−1s−1. The modeling results also showed that both the power law and Langmuir–Hinshelwood models agreed with the data obtained from catalytic performance (R2 > 0.9). The results show that the Pt/HZSM-5-SBA-3 catalyst has the lowest activation energy (13.64 kJ mol−1) and the highest reaction rate. The reaction order for hydrogen is in the range of − 0.03 to − 0.25 and that for n-C7 is 0.88–1.19.
期刊介绍:
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