Abstract

The highly productive supported bifunctional catalyst based on cobalt, zeolite ZSM-5, and a binding agent (boehmite) is developed for the production of gasoline and diesel hydrocarbon fractions. Influence of the concentration of the ZSM-5 zeolite in the range of 0–70 wt % and cobalt (6.4–18.0 wt %) on activity and selectivity for individual groups of hydrocarbons in the synthesis of hydrocarbons from CO and H₂ is studied. The catalysts are characterized by X-ray powder diffraction, the Brunauer–Emmett–Teller method, and hydrogen temperature-programmed reduction and tested in the synthesis of hydrocarbons from CO and H₂ in the continuous mode at a pressure of 2.0 MPa, a gas space velocity of 1000 h⁻¹, and a temperature of 240°C. It is found that the time of reduction of the supported catalyst should be at least 10 h. In the case of an increase in the fraction of the zeolite in the catalyst, iso-alkanes are predominantly synthesized; to a lesser extent, branched alkenes. On the contrary, in the case of a decrease in the concentration of cobalt, the branched alkene selectivity grows and iso-alkane selectivity drops. The optimum concentrations of the zeolite and cobalt for the highly productive supported bifunctional catalyst are within 60–70 and 6–12 wt %, respectively.

中文翻译：

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基于ZSM-5沸石的高产负载型双功能催化剂的开发，该催化剂可用于从CO和H 2产生燃料级烃馏分

摘要

开发了基于钴，ZSM-5沸石和粘结剂（勃姆石）的高产负载型双功能催化剂，用于生产汽油和柴油烃馏分。研究了ZSM-5沸石的浓度在0-70 wt％的范围内和钴（6.4-18.0 wt％）对由CO和H ₂合成烃类中各个烃类活性和选择性的影响。催化剂的特征在于X射线粉末衍射，Brunauer-Emmett-Teller方法和氢程序升温还原，并在压力为2.0 MPa的条件下以连续模式由CO和H ₂合成烃进行了测试。空速1000 h ^-1，温度为240°C。发现载体催化剂的还原时间应至少为10小时。在催化剂中沸石分数增加的情况下，主要合成异烷烃。在较小程度上是支链烯烃。相反，在钴浓度降低的情况下，支链烯烃的选择性增加并且异烷烃的选择性下降。高生产率负载型双功能催化剂的最佳沸石和钴浓度分别在60-70 wt％和6-12 wt％之内。