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Ethanol dehydrogenation over Cu catalysts promoted with Ni: stability control
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2019-12-27 , DOI: 10.1016/j.apcata.2019.117401
Jolien De Waele , Vladimir V. Galvita , Hilde Poelman , Margarita Gabrovska , Dimitrinka Nikolova , Sonia Damyanova , Joris W. Thybaut

NiCu alloyed catalysts are investigated for ethanol dehydrogenation. Seven Xwt%Ni-Ywt%Cu/Mg(Al)(Ni)(Cu)Ox catalysts, (X = 0.5 or 1, Y = 0, 5, 10 or 20) have been compared with a 10 wt%Cu/Mg(Al)(Cu)Ox benchmark. It was found that Ni promotion increases the turn-over frequency of a Cu-based catalyst. Two deactivation regimes were observed, i.e., a fast deactivation within the first hours on stream during which the acetaldehyde selectivity improved, followed by a slower deactivation. TPO and STEM indicated that surface carbon formation and sintering were likely at the origin of respectively the first and second deactivation regime. On the best performing catalyst, i.e., 1 wt%Ni-10 wt%Cu/Mg(Al)(Ni)(Cu)Ox, no fast deactivation regime was observed and the lowest amount of carbon was produced. Upon feeding 30 wt%H2O/ethanol, the activity of all NiCu catalysts increased. Overall, 1 wt%Ni-10 wt%Cu/Mg(Al)(Ni)(Cu)Ox was the best performing catalyst with a TOF of 0.09s-1 and an acetaldehyde selectivity of 99%.



中文翻译:

Ni促进Cu催化剂上的乙醇脱氢:稳定性控制

研究了NiCu合金催化剂用于乙醇脱氢的过程。比较了7种Xwt%Ni-Ywt%Cu / Mg(Al)(Ni)(Cu)O x催化剂(X = 0.5或1,Y = 0、5、10或20)和10 wt%Cu / Mg(Al)(Cu)O x基准。发现Ni促进增加了Cu基催化剂的翻转频率。观察到两种失活方案,即在生产的最初几个小时内快速失活,在此期间乙醛的选择性得到改善,随后是较慢的失活。TPO和STEM表明表面碳的形成和烧结可能分别发生在第一和第二钝化机制的起点。在性能最佳的催化剂上,即1 wt%Ni-10 wt%Cu / Mg(Al)(Ni)(Cu)O x,没有观察到快速失活机制,并且产生了最低量的碳。当进料30wt%的H 2 O /乙醇时,所有NiCu催化剂的活性均增加。总体而言,1 wt%Ni-10 wt%Cu / Mg(Al)(Ni)(Cu)O x是表现最佳的催化剂,TOF为0.09s -1,乙醛选择性为99%。

更新日期:2019-12-27
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