费托合成油技术是煤炭、天然气等含碳资源清洁优化利用的重要途径,其关键问题之一是催化剂选择性的调控,即抑制甲烷生成和提高馏分油含量.近10年来,中国科学院山西煤炭化学研究所系统地开展了钴基费托合成催化剂及制备放大的工程基础研究,包括钴分散度、还原度与甲烷生成之间的关系,载体表面疏水性对催化剂性能的影响,以及采用孔道限域等手段初步实现了产物的选择性调控.同时,初步阐明了甲烷生成的结构基础,并指明了新型馏分油催化剂研发方向.在此基础上,研制了新型钴基催化剂,其具有低甲烷选择性、高重质烃选择性和良好稳定性的特点.目前,对Ⅰ型催化剂完成了实验室稳定性验证并实现了工业示范;对Ⅱ型催化剂(甲烷选择性约2%~3%)完成了稳定性验证.
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