Optimized kinetic study of the isomerization reaction over composite catalysts by applying response surface methodology

IF 2.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
Nastaran Parsafard, Behnam Derakhshan
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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.

Abstract Image

应用响应面方法优化复合催化剂上异构化反应的动力学研究
将 Pt/HZSM-5-(KCC-1、KIT-6 和 SBA-3)催化剂成功用于正庚烷的异构化反应。采用响应面方法结合中心复合设计对这些催化剂进行了优化。研究了温度、接触时间、正庚烷和氢气的流速等重要变量对反应(反应速率)的影响。方差分析得出了一个重要的四元模型,该模型对估计这些催化剂的反应速率具有良好的准确性。Pt/HZSM-5-SBA-3 催化剂的最佳条件为温度 350 ℃、接触时间 6 h、H2 流速 20 cc min-1 和 n-C7 流速 2 cc h-1,反应速率为 5.7 mol g-1s-1。建模结果还显示,幂律模型和 Langmuir-Hinshelwood 模型与催化性能数据一致(R2 > 0.9)。结果表明,Pt/HZSM-5-SBA-3 催化剂的活化能最低(13.64 kJ mol-1),反应速率最高。氢气的反应顺序在 - 0.03 至 - 0.25 之间,而 n-C7 的反应顺序为 0.88 至 1.19。
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来源期刊
CiteScore
4.40
自引率
8.30%
发文量
230
审稿时长
5.6 months
期刊介绍: JICS is an international journal covering general fields of chemistry. JICS welcomes high quality original papers in English dealing with experimental, theoretical and applied research related to all branches of chemistry. These include the fields of analytical, inorganic, organic and physical chemistry as well as the chemical biology area. Review articles discussing specific areas of chemistry of current chemical or biological importance are also published. JICS ensures visibility of your research results to a worldwide audience in science. You are kindly invited to submit your manuscript to the Editor-in-Chief or Regional Editor. All contributions in the form of original papers or short communications will be peer reviewed and published free of charge after acceptance.
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