A Novel MIL-101(Cr)Acidified by Silicotungstic Acid and Its Catalytic Performance for Isomerization of n-Heptane

• 作者: Zhang Wei Liu Rongjiang Ma Shoutao Kuvshinov Dimitriy Suo Yanhua Wang Yingjun
• 来源期刊: 中国炼油与石油化工（英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: Catalyst Research
• 页码范围: 68-80
• 页数: 13页
• 语种: 英文

摘要

The 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 was arranged orderly.The specific surface area of the samples was extremely high and the samples were made of 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/30％STA-MIL-101(Cr)was significantly improved with a n-heptane conversion of 58.93％and an iso-heptane selectivity of 95.68％,respectively,under conditions covering a reaction time of 2 h and a reaction temperature of 260℃.The catalyst could still maintain a relatively high catalytic performance after a reaction time of 5 h.Compared with the non-noble metal catalyst,the catalytic efficiency of 0.4％Pt/30％STA-MIL-101(Cr)is relatively high.The mechanism model of n-heptane isomerization over 0.4％Pt/xSTA-MIL-101(Cr)catalyst was established.