中国炼油与石油化工 ›› 2022, Vol. 24 ›› Issue (1): 68-80.

• Catalyst Research • 上一篇    下一篇

硅钨酸酸化的新型MIL-101(Cr)催化剂及其对正庚烷异构化反应的催化性能

张微1,刘荣江1,马守涛1,2,Dimitriy Kuvshinov3,所艳华4,汪颖军5   

  1. 1. 东北石油大学
    2. 中国石油大庆化工研究中心
    3. University of Hull Hull HU6 7RX, UK Hull
    4. Northeast Petroleum University
    5. 东北石油大学化学化工学院
  • 收稿日期:2021-06-27 修回日期:2021-07-28 出版日期:2022-03-30 发布日期:2022-03-30
  • 通讯作者: 刘荣江 E-mail:2317176824@qq.com

A novel MIL-101(Cr) acidified by silicotungstic acid and its catalytic performance for isomerization of n-heptane

  • Received:2021-06-27 Revised:2021-07-28 Online:2022-03-30 Published:2022-03-30

摘要: 0.4%Pt/xSTA-MIL-101(Cr) metal-acid bifunctional catalysts were prepared by impregnation using STA-MIL-101(Cr) as the support. The synthesized samples were verified to exhibit a typical octahedral structure of MIL-101(Cr) and the pore structure were arranged orderly. The specific surface area of the samples was extremely high and the samples were micro-mesoporous composite materials. Silicotungstic acid could retain its Keggin structure in the 0.4%Pt/xSTA-MIL-101(Cr) samples and the catalyst possessed moderately strong Br?nsted acid sites. Besides, the dispersion of Pt particles in MIL-101(Cr) was relatively high. n-Heptane isomerization was first used as a probe to test the novel 0.4%Pt/xSTA-MIL-10(Cr) catalyst. Compared with the conventional silicate catalysts, the catalytic performance of 0.4%Pt/30wt%STA-MIL-101(Cr) was significantly improved with n-heptane conversion of 58.93% and iso-heptane selectivity of 95.68%, respectively, when the reaction time was 2 h at the reaction temperature of 260 oC. The catalyst could still maintain a relatively high catalytic performance during the reaction time of 5 h. Compared with the non-noble metal catalysts, the catalytic efficiency is relatively high. The mechanism model of n-heptane isomerization over 0.4%Pt/xSTA-MIL-101(Cr) catalyst was established.

关键词: MIL-101, 硅钨酸, 正庚烷, 异构化,

Abstract: 0.4%Pt/xSTA-MIL-101(Cr) metal-acid bifunctional catalysts were prepared by impregnation using STA-MIL-101(Cr) as the support. The synthesized samples were verified to exhibit a typical octahedral structure of MIL-101(Cr) and the pore structure were arranged orderly. The specific surface area of the samples was extremely high and the samples were micro-mesoporous composite materials. Silicotungstic acid could retain its Keggin structure in the 0.4%Pt/xSTA-MIL-101(Cr) samples and the catalyst possessed moderately strong Br?nsted acid sites. Besides, the dispersion of Pt particles in MIL-101(Cr) was relatively high. n-Heptane isomerization was first used as a probe to test the novel 0.4%Pt/xSTA-MIL-10(Cr) catalyst. Compared with the conventional silicate catalysts, the catalytic performance of 0.4%Pt/30wt%STA-MIL-101(Cr) was significantly improved with n-heptane conversion of 58.93% and iso-heptane selectivity of 95.68%, respectively, when the reaction time was 2 h at the reaction temperature of 260 oC. The catalyst could still maintain a relatively high catalytic performance during the reaction time of 5 h. Compared with the non-noble metal catalysts, the catalytic efficiency is relatively high. The mechanism model of n-heptane isomerization over 0.4%Pt/xSTA-MIL-101(Cr) catalyst was established.

Key words: MIL-101, Silicotungstic acid, n-Heptane, Isomerization, Platinum