Reprint of influence of catalyst preparation on the contribution of homogeneous and heterogeneous steps to the selectivity in nitroaliphatic compounds hydrogenation
Reprint of influence of catalyst preparation on the contribution of homogeneous and heterogeneous steps to the selectivity in nitroaliphatic compounds hydrogenation
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DOI：
10.1016/j.apcata.2013.09.004
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发表时间：
2013-11
影响因子：
5.5
通讯作者：
V. Dubois;G. Jannes
中科院分区：
文献类型：
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作者：
V. Dubois;G. Jannes
2-甲基-2-硝基丙烷加氢反应按ARAKE方案进行，可能包括均相步骤、载体上的反应以及金属相上的反应。这种复杂性使其成为一种有用的测试反应。反应速率、选择性和中间化合物的积累为催化剂参数的修饰提供了实验信息，如载体官能度和金属分散性。实验在均相、裸碳载体上、裸碳载体与碳载体催化剂的机械混合物以及在改性载体上制备的催化剂上进行。我们已经证明，氢活化发生在金属上，有机反应物和中间体可以在金属和碳载体上活化，并可能在溢出和跳跃迁移后与可用的氢反应。
2-Methyl-2-nitropropane hydrogenation proceeds along arake schemethat may encompass homogeneous steps, reactions on the support and on the metallic phase as well. This complexity makes it useful as a test reaction. Reaction rates, selectivities and intermediate compounds accumulation provide experimental information on the modification of catalytic parameters such as support functionality and metallic dispersion. Experiments were carried out in homogeneous phase, on bare carbon supports, with mechanical mixtures of bare carbon supports and carbon-supported catalysts, and with catalysts prepared on modified supports. We have shown that hydrogen activation takes place on the metal and that organic reactants and intermediates may be activated on the metal and on the carbon support as well and may react with hydrogen available after spillover and jumpover migrations.