Abstract

A series of well-defined and uniform pore-structure (WDUPS) TiO₂/SiO₂ supports with various percentages of rutile TiO₂ was developed. Then Fe was introduced into the as-prepared WDUPS supports by incipient wetness impregnation to obtain WDUPS Fe/TiO₂/SiO₂ catalysts for the Fischer–Tropsch (FT) synthesis. Due to a similar surface OH density in the supports and the same pore structure and Fe loading, the catalytic performance of WDUPS catalysts dominated by percentages of rutile TiO₂. Based on the catalytic performance for FT synthesis and the characterization of the H₂ temperature-programmed reduction (H₂-TPR) and the X-ray photoelectron spectroscopy (XPS), the results suggested that rutile TiO₂ acted as a structure promoter in titania-supported iron catalysts and led to an increase in the catalytic activity during FT synthesis. The C₅₊ selectivity had an increase as the percentage of the rutile phase increased, which was also probably because of rutile TiO₂ as a structure promoter for enhancing chain growth.

中文翻译：

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定义明确且均匀的孔结构Fe / TiO 2 / SiO 2催化剂中TiO 2的结晶相对费-托合成的内在影响

摘要

开发了一系列定义明确且均匀的孔结构（WDUPS）TiO ₂ / SiO ₂载体，其中包含不同百分比的金红石TiO ₂。然后通过初湿浸渍将Fe引入制备好的WDUPS载体中，从而获得用于费托合成（FT）的WDUPS Fe / TiO ₂ / SiO ₂催化剂。由于载体中相似的表面OH密度，相同的孔结构和Fe负载，WDUPS催化剂的催化性能主要由金红石TiO _2的百分比决定。根据FT合成和H的表征催化性能₂程序升温还原（H ₂-TPR）和X射线光电子能谱（XPS），结果表明金红石TiO ₂在二氧化钛负载的铁催化剂中充当结构促进剂，并导致FT合成过程中的催化活性增加。C ₅₊选择性随着金红石相的百分比的增加而增加，这也可能是由于金红石TiO ₂作为促进链增长的结构促进剂。