Chain-Limiting Operation of Fischer-Tropsch Reactor.

Nikolopoulos, A. A. ; Gangwal, S. K.

Technical Information Center Oak Ridge Tennessee

关键词: Fischer-Tropsch synthesis;    Chemical reactors;    Catalysts;    Alkenes;    Carbon monoxide;   

RP-ID  :  DE2004834796

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The use of H(sub 2) pulsing to maximize the yield of diesel-range (C(sub 10)-C(sub 20)) Fischer-Tropsch (FT) synthesis products was examined on two high-chain-growth-probability (a (ge) 0.9) Co-based FT catalysts. For both catalysts, H(sub 2) pulsing causes a significant increase in CO conversion, while only temporarily increasing the selectivity to undesirable CH(sub 4). Increasing the frequency or the duration of H(sub 2) pulsing produces higher CO productivity and higher yield of the C(sub 10)-C(sub 20) range on the Co/Al(sub 2)O(sub 3) catalyst, in agreement with prior observations on a Co-Zr/SiO(sub 2) catalyst. An optimum set of pulse parameters is required for maximizing the selectivity towards the desirable C(sub 10)-C(sub 20) diesel product fraction. Application of a suitable H(sub 2) pulse in the presence of added steam in the feed is a simple method to overcome the loss in activity and the shift in paraffin vs. olefin selectivity (increase in the olefin/paraffin ratio) caused by the excess steam.