466898 Mesoporous Catalysts for Conversion of 2,3-Butanediol to Butene
Reactions were performed over reduced catalysts at the same reaction conditions (feed rate of 2,3-butanediol of 3.0 mL/h, hydrogen to 2,3-butanediol molar ratio of 5, reaction temperature 250 oC). The catalytic results demonstrated that 20%CuO/Al-SBA-15(50) exhibited the highest initial selectivity of butenes, which is 76.6% at 10 min of reaction. In addition, the results showed that the existence of mesopores on the catalysts (Al-MCM-48 and Al-SBA-15 types) could decrease the selectivities of products from cracking reactions, especially C3= and C5=- C7=, by comparison with the previous report on the catalyst 20%CuO/ZSM-5(280) ; meanwhile, the selectivity of C8= was found to increase with increasing pore size of the catalyst. However, the activities of the catalysts with MCM-48 and SBA-15 types were decreased dramatically over time. With respect to CuO/meso-ZSM-5(280) catalyst, it can be seen that the catalyst has the composited performance of both CuO/ZSM-5(280) catalyst and mesoporous copper catalysts (CuO/Al-MCM-48 and CuO/Al-SBA-15). Cu/meso-ZSM-5(280) is displayed high activity on the cracking reaction (C3=, C5=~C7=), and the oligomerization (C8=) as well. Interestingly, Cu/meso-ZSM-5(280) showed an excellent catalytic stability; the selectivity of butenes dropped from 71% to 61% in 670 min of reaction, which is much better than the catalyst with Cu loaded on the conventional ZSM-5(280), the selectivity of butenes dropped from 71% to 50% in 550 min.
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