Abstract

In this article, a simplified iron/spinel catalyst system was adopted as the Fischer–Tropsch to light olefins (FTO) catalyst to rule out disturbances from efficient promoters (e.g., K or combination of S/Na). Supported by regular supports (e.g., Al₂O₃, carbon, etc.), unpromoted iron catalysts commonly have a maximum C₂⁼–C₄⁼ hydrocarbon distribution below 28%. Supported by a composite oxide support (i.e., nominal composition, ZnAl₄O₇, calcined at 350 °C), our porous, unpromoted iron catalyst exhibits a maximum C₂⁼–C₄⁼ hydrocarbon distribution of 40%, achieving a significant increase by ca. 42% in comparison with regular supports. Appropriate lifting of atomic Zn/Fe ratio, as well as, reducing at lower temperature plus mild carburization, both can make a supported iron catalyst more efficient in hindering C–C coupling and producing light olefins. The structure of ZnAl₄O₇ support remains stable in iron catalysts during CO hydrogenation.

中文翻译：

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多孔铁/尖晶石催化剂在CO加氢过程中Zn / Fe比及活化途径的研究

摘要

在本文中，采用简化的铁/尖晶石催化剂体系作为费托轻质烯烃（FTO）催化剂，以排除有效助催化剂（例如K或S / Na的组合）的干扰。在常规载体（例如Al ₂ O ₃，碳等）的支持下，未助催化的铁催化剂的最大C ₂ ⁼ –C ₄ ⁼烃分布低于28％。在复合氧化物载体（即标称成分ZnAl ₄ O ₇，在350°C下煅烧）的支持下，我们的多孔，未助催化的铁催化剂的最大C ₂ ⁼ –C ₄ ⁼碳氢化合物的分布为40％，实现了显着的增加。与常规支持相比为42％。适当提高原子的锌/铁比，以及在较低的温度下还原以及适度的渗碳，都可以使负载型铁催化剂更有效地阻止C-C偶联和生产轻质烯烃。在CO加氢过程中，ZnAl ₄ O ₇载体的结构在铁催化剂中保持稳定。