SELECTIVE OXIDATIVE DEHYDROGENATION OF BUTANE OVER V-MG-O CATALYSTS
SELECTIVE OXIDATIVE DEHYDROGENATION OF BUTANE OVER V-MG-O CATALYSTS
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DOI：
10.1016/0021-9517(87)90076-5
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发表时间：
1987-06-01
影响因子：
7.3
通讯作者：
KUNG, HH
中科院分区：
文献类型：
--
作者：
CHAAR, MA;PATEL, D;KUNG, HH
钒镁氧化物是丁烷选择性氧化脱氢催化剂。脱氢的选择性随着钒含量的增加而增加，直到达到最佳的样品含有24至54重量%的V2 O 5。红外光谱、X-射线衍射、俄歇电子能谱和扫描电子显微镜研究表明，催化剂的活性组分是复合钒酸镁。对于在约540 °C下的给定催化剂，氧化脱氢的选择性随着降低的氧与丁烷比、降低的转化率和降低的温度而增加。获得高达60%的选择性。氧化脱氢的高选择性，而不是丁二烯生产归因于两个因素：碱性表面有利于碱性丁烯和丁二烯的脱附，和V2 O的缺乏降低了表面的氧化活性。
Vanadium-magnesium oxides were found to be selective oxidative dehydrogenation catalysts for butane. The selectivity for dehydrogenation increased with increasing vanadium content until an optimum was reached for samples containing 24 to 54 wt% V2O5. Infrared spectroscopy, X-ray diffraction, Auger electron spectroscopy, and scanning electron microscopy studies of the catalysts suggested that the active component was the compound magnesium orthovanadate. For a given catalyst at about 540 °C, the selectivity for oxidative dehydrogenation increased with decreasing oxygen-to-butane ratio, decreasing conversion, and decreasing temperature. A selectivity of up to 60% was obtained. The high selectivity for oxidative dehydrogenation instead of oxygenate production is attributed to two factors: the basic surface facilitates desorption of basic butenes and butadiene, and the absence of VO lowers the oxidation activity of the surface.