Coupling of Methanol and Carbon Monoxide over H‐ZSM‐5 to Form Aromatics
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Abstract:
The conversion of methanol into aromatics over unmodified H-ZSM-5 zeolite is generally not high because the hydrogen transfer reaction results in alkane formation. Now circa 80 % aromatics selectivity for the coupling reaction of methanol and carbon monoxide over H-ZSM-5 is reported. Carbonyl compounds and methyl-2-cyclopenten-1-ones (MCPOs), which were detected in the products and catalysts, respectively, are considered as intermediates. The latter species can be synthesized from the former species and olefins. 13 C isotope tracing and 13 C liquid-state NMR results confirmed that the carbon atoms of CO molecules were incorporated into MCPOs and aromatic rings. A new aromatization mechanism that involves the formation of the above intermediates and co-occurs with a dramatically decreased hydrogen transfer reaction is proposed. A portion of the carbons in CO molecules are incorporated into aromatic, which is of great significance for industrial applications.Keywords:
Aromatization
ZSM-5
Alkane
A series of hierarchical ZSM-5 zeolites with different Si/Al ratios were successfully prepared using a seed-deduced method and the addition of organosilicone reagents into the medial synthesis system.
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ZSM-5
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Aromatization
Dimethyl ether
ZSM-5
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Compared to Zn/H ZSM 5,lower aromatization activity and selectivity were obtained by the addition of Al_2O_3 to Zn/H ZSM 5 catalyst for n hexane aromatization, while the catalyst stability improved. The analytical results by TEM-EDS technique indicated that the effect of Al_2O_3 on the aromatization performance of Zn/H ZSM 5 was closely correlated with the zinc emigration from H ZSM 5 to Al_2O_3 after calcination and hydrothermal treatment. Especially, the aromatization on Al_2O_3 and Zn/Al_2O_3 and the effect of incorporation of Zn component or Zn/Al_2O_3 were studied. The experimental results showed that Al_2O_3 and Zn/Al_2O_3 had very weak aromatization activity and little effect on the catalytic properties of H ZSM 5. Therefore, it was concluded that it was only the zinc component on the surface of H ZSM 5 zeolite that could cooperate with H ZSM 5 and modify its catalytic performance, while the synergistic action couldn't take place between H ZSM 5 and zinc component on Al_2O_3.
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ZSM-5
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Aromatization
ZSM-5
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Aromatization
ZSM-5
Pentane
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Aromatization
Propene
ZSM-5
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Aromatization
ZSM-5
Crystal (programming language)
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Aromatization of light hydrocarbons can contribute to a secure supply of aromatics for the chemical industry. In this work, we investigate the influence of modification of zeolite ZSM-5 with Ga and Mo on the reaction mechanism underlying the activation and aromatization of ethane. Well-defined Mo/ZSM-5 and Ga/ZSM-5 zeolites efficiently promote ethane aromatization to benzene-toluene-xylene mixtures. Both catalysts suffer from coke formation, which leads to rapid deactivation. From catalytic tests, temperature-programmed surface reaction and pulsed reaction experiments, we infer that ethane conversion on Ga/ZSM-5 follows a conventional sequential dehydrogenation-oligomerization-aromatization mechanism, while the reaction over Mo/ZSM-5 involves reactive surface carbon (hydrocarbon pool) species.
Aromatization
ZSM-5
Transalkylation
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At present, under the background of the excess product oil market, "reducing oil products and increasing chemical raw materials" has become the mainstream trend in the chemical industry. In recent years, ZSM-5 zeolite catalyst has been widely used in the aromatization of FCC gasoline, but its modification to improve its aromatization catalytic performance is still not perfect. Therefore, based on the existing process technology, the effect of pseudo-boehmite on the aromatization performance of Zn-P-Al/ZSM-5 catalysts was investigated on a small continuous fixed-bed reactor using 75-120 °C fractions of FCC gasoline as feedstock. The results show that the aromatization performance of Zn-P-Al/ZSM-5 catalyst is better than that of Zn-P/ZSM-5 and HZSM-5, and the best aromatization performance is obtained when the pseudo-boehmite ratio is 30%, the aromatics content and aromatics yield in liquid products are 90.82% and 54.38%, respectively. The results of catalyst characterization are consistent with those of catalyst evaluation.
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Boehmite
ZSM-5
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甲醇芳构化反应中 Ag/ZSM-5 催化剂的失活特性( 1 北京市绿色反应工程与工艺重点实验室, 清华大学化工系, 北京 100084; 2 中石化经济技术研究院, 北京 100029)摘要： 通过四次连续反应-再生循环实验对甲醇芳构化催化剂 Ag/ZSM-5 进行了失活再生研究, 结果表明催化 剂通过烧碳可以得到部分再生.对反应-
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ZSM-5
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