SEAL PRODUCTS AND THEIR ROLE IN THE PROCESS OF CONVERSION OF ISOBUTENE ON A HIGH SILICA ZEOLITE CATALYST

Azerbaijan Journal of Chemical News Pub Date : 2022-05-30 DOI:10.32010/ajcn5012022-65

I. J. A. I. J. Ahmedova

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Abstract

Conversion of isobutene on a high silica zeolite catalyst in the temperature interval (473-773 K) has been studied. The formation of liquid reaction products is observed at the temperature 473 K, whereas gaseous products form after 523K. Maximum yield of liquid products is observed at the temperature 573 K and makes up 67 %. With increase of contact time the yield of liquid reaction products shifts towards high temperatures. Formation of aromatic hydrocarbons is observed at the reaction temperature higher than 573 K. At the temperature 673 K the main mass of liquid products consists of aromatic hydrocarbons. The activity of H-form of HSZ (HHSZ) in the process of conversion of isobutene in the formation of liquid reaction products occurs only when 6-8% of seal products accumulate on its surface. By the method of ammonia adsorption on the initial and coked catalyst their acidic properties have been studied. It was shown that at the beginning of the process decrease in acidic properties of the catalyst occurs due to accumulation of seal products on it. Key words: catalyst, activity, isobutene, zeolite, seal products, temperature, heterogen, chromatography, spectroscopy.

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密封产物及其在高硅沸石催化剂上异丁烯转化过程中的作用

研究了高硅沸石催化剂在473 ~ 773 K温度区间内异丁烯的转化。液相反应产物在473 K时形成，而气态产物在523K后形成。在温度为573 K时，液相产物收率最高，达67%。随着接触时间的增加，液体反应产物的产率向高温方向转移。在高于573 K的反应温度下，观察到芳香烃的生成。在温度为673 K时，液体产物的主要质量是芳烃。h型HSZ (HHSZ)在异丁烯转化成液体反应产物过程中的活性只有在其表面积聚6-8%的密封产物时才会发生。用氨吸附法对初始催化剂和焦化催化剂的酸性进行了研究。结果表明，在工艺开始时，由于密封产物在催化剂上的积累，催化剂的酸性性能下降。关键词:催化剂，活性，异丁烯，沸石，密封产物，温度，异质，色谱，光谱。

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Azerbaijan Journal of Chemical News

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