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| Performance of Different Metal-Modified HZSM-5 Catalysts for Methanol Carbonylation |
| Author Name | Affiliation | E-mail | | Dilinuer Aili | State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources
School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830017, China | | | GAO Xi-Ran | State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources
School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830017, China | | | BI Kun-Hao | State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources
School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830017, China | | | FANG Ya-Ping | State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources
School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830017, China | | | FAN Xing | State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources
School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830017, China | | | Aisha Nulahong | State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources
School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830017, China | aisa705@163.com |
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| Abstract: In this study, selective production of methanol carbonylation formed acetic acid using hydrothermal synthesis nanoporous zeolite molecular sieve as the catalyst. The incorporation of a suitable amount of metal not only facilitated the formation of acidity but also improved the efficiency of methanol carbonylation. The HZSM-5 catalyst was modified with Pt, Pd, Cu, Au, Zn by negative pressure deposition precipitation method to prepare catalysts with different acidities. Using X-ray diffraction, temperature-programmed desorption of ammonia, pyridine adsorption FTIR, N2 adsorption-desorption, and X-ray fluorescence analysis, the effect of different metals on the physico-chemical properties of the catalyst was studied, and the modification of HZSM-5 with different metals was investigated in the process of methanol carbonylation on the distribution and yield of methanol carbonyl products. The introduction of different metals had little effect on the specific surface area, pore size, and pore volume of the HZSM-5 catalyst, but significantly changed the acid strength of the catalyst surface. Pt, Au, Zn, and Cu modified HZSM-5 were favorable for the carbonylation of methanol to form methyl acetate and methyl formate. Cu-modified catalyst had a methanol conversion rate of 90.2% at 400℃, which was 12% higher than that of pristine HZSM-5, but the selectivity to the target product was lower than those of Pt/HZSM-5 and Au/HZSM-5. In a word, the introduction of metals changes the number of Brønsted acid (B acid) and Lewis acid (L acid) centers on the catalyst surface. The conversion rate of methanol increased with the total acid sites. When the ratio of B acid to L acid on the catalyst surface was between 0.3 and 0.5, the catalyst showed better carbonylation activity. |
| Keywords: HZSM-5 metal-modification carbonylation of methanol strength of acid |
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| Dilinuer Aili,GAO Xi-Ran,BI Kun-Hao,FANG Ya-Ping,FAN Xing,Aisha Nulahong.Performance of Different Metal-Modified HZSM-5 Catalysts for Methanol Carbonylation[J].Chinese Journal of Inorganic Chemistry,2022,38(5):901-912. |
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