负载Zr和pt的金属在y型沸石催化剂上改善正庚烷加氢异构反应产物的实验和动力学研究

IF 0.7 Q4 CHEMISTRY, MULTIDISCIPLINARY Orbital: The Electronic Journal of Chemistry Pub Date : 2022-10-01 DOI:10.17807/orbital.v14i3.17429
Younus H. Khalaf, B. Al-Zaidi, Zaidoon M. Shakour
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引用次数: 5

摘要

Pt金属成本的不断上涨促使研究人员将其他金属掺入Pt/催化剂中以减少Pt的含量。在这项工作中,通过将少量廉价的Zr掺入Pt/HY沸石中以形成活性和选择性催化剂,制备了几种双金属Pt-Zr/HY沸石催化剂。结果表明,尽管使用了所需铂金属的一半,但所制备的Pt-Zr/HY双金属催化剂的催化活性高于单金属(Pt或Zr)/HY催化剂,这是由于添加Zr金属提高了催化剂的路易斯酸性;此外,支链烷烃的产率也有所提高。最佳催化剂为双金属催化剂,含有0.5wt%的Pt+0.5wt%的Zr,在1MPa和250°C的反应条件下,异构体的最高产率为70.2mol%,转化率和选择性分别为82.61和84.98mol%。此外,还建立了加氢异构化反应动力学模型,预测结果与实验计算结果一致,相对误差可接受。烯烃加氢制异链烷烃需要较低的活化能(约44.5kJ/mol),而异链烷烃加氢裂化需要较高的活化能,约138.1kJ/mol。
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Experimental and Kinetic Study of the Effect of using Zr- and Pt-loaded Metals on Y-zeolite-based Catalyst to Improve the Products of n-heptane Hydroisomerization Reactions
The escalating cost of Pt metal has prompted researchers to incorporate other metals into Pt/catalysts to reduce the amount of Pt. In this work, several bimetallic Pt-Zr/HY-zeolite catalysts were prepared by incorporating small amounts of the inexpensive Zr into the Pt/HY-zeolite to form an active and selective catalyst. Results showed that although half of the required platinum metal was used, the catalytic activity of the prepared Pt-Zr/HY bimetallic catalyst was higher than that of the monometallic (Pt or Zr)/HY catalysts, as a result of the improved Lewis acidity of that catalyst that resulted from the addition of the Zr metal; additionally, the branched alkanes' yield also increased. The optimum catalyst was bimetallic, containing 0.5 wt% Pt + 0.5 wt% Zr, which achieved the highest yield of isomers at 70.2 mol%, along with 82.61 and 84.98 mol% for conversion and selectivity, respectively, under 1 MPa and 250°C reaction conditions. In addition, the hydroisomerization reaction kinetic model was achieved, giving good predicted results in agreement with the experimental calculations, with an acceptable relative error. It was found that lower activation energies (about 44.5 kJ/mol) were needed for olefin hydrogenation to iso-paraffins, while higher activation energies were required for i-paraffin hydrocracking (about 138.1kJ/mol).
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来源期刊
Orbital: The Electronic Journal of Chemistry
Orbital: The Electronic Journal of Chemistry CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
1.10
自引率
0.00%
发文量
25
审稿时长
10 weeks
期刊介绍: Orbital: The Electronic Journal of Chemistry is a quarterly scientific journal published by the Institute of Chemistry of the Universidade Federal de Mato Grosso do Sul, Brazil. Original contributions (in English) are welcome, which focus on all areas of Chemistry and their interfaces with Pharmacy, Biology, and Physics. Neither authors nor readers have to pay fees. The journal has an editorial team of scientists drawn from regions throughout Brazil and world, ensuring high standards for the texts published. The following categories are available for contributions: 1. Full papers 2. Reviews 3. Papers on Education 4. History of Chemistry 5. Short communications 6. Technical notes 7. Letters to the Editor The Orbital journal also publishes a number of special issues in addition to the regular ones. The central objectives of Orbital are threefold: (i) to provide the general scientific community (at regional, Brazilian, and worldwide levels) with a formal channel for the communication and dissemination of the Chemistry-related literature output by publishing original papers based on solid research and by reporting contributions which further knowledge in the field; (ii) to provide the community with open, free access to the full content of the journal, and (iii) to constitute a valuable channel for the dissemination of Chemistry-related investigations.
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