NiO diluted in high surface area TiO2 as an efficient catalyst for the oxidative dehydrogenation of ethane
NiO diluted in high surface area TiO2 as an efficient catalyst for the oxidative dehydrogenation of ethane
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DOI：
10.1016/j.apcata.2017.02.012
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发表时间：
2017-04
影响因子：
5.5
通讯作者：
R. Sanchís;D. Delgado;S. Agouram;M. D. Soriano;M. Vázquez;E. Rodriguez-castellon;B. Solsona;J. Nieto
中科院分区：
文献类型：
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作者：
R. Sanchís;D. Delgado;S. Agouram;M. D. Soriano;M. Vázquez;E. Rodriguez-castellon;B. Solsona;J. Nieto
由稀释在高表面积TiO 2中的NiO组成的催化剂在乙烷的氧化脱氢中可以与文献中先前报道的最具选择性的NiO促进的催化剂一样有效。通过选择二氧化钛基质和NiO负载量，乙烯收率超过40%。在本文中，三种不同的氧化钛（TiO 2）已被用作载体或稀释剂的氧化镍，并已在乙烷氧化脱氢为乙烯进行了测试。所用的所有TiO 2均以TiO 2为主晶相，具有11、55和85 m2 g −1的不同表面积。已经观察到，通过选择适当的镍负载量和氧化钛，可以获得对乙烯的极高选择性。因此，负载在具有高表面积（即55和85 m2 g-1）的TiO 2上的氧化镍产生了最佳的催化性能，尽管最佳的镍负载对于每种情况是不同的。最佳的催化剂已经获得了NiO负载量高达5-10理论单层，无论采用的TiO 2。游离TiO 2是无活性的，而无载体NiO是活性的和无选择性的（主要形成二氧化碳），因此，为了获得最佳的催化性能，必须避免使用未改性的NiO颗粒。由于存在过量的游离NiO颗粒，使用低表面积二氧化钛（11 m2 g-1）导致对烯烃的选择性最低。
Catalysts consisting of NiO diluted in high surface area TiO2can be as efficient in the oxidative dehydrogenation of ethane as the most selective NiO-promoted catalysts reported previously in the literature. By selecting the titania matrix and the NiO loading, yields to ethylene over 40% have been obtained. In the present article, three different titanium oxides (TiO2) have been employed as supports or diluters of nickel oxide and have been tested in the oxidative dehydrogenation of ethane to ethylene. All TiO2used present anatase as the main crystalline phase and different surface areas of 11, 55 and 85 m2g−1. It has been observed that by selecting an appropriate nickel loading and the titanium oxide extremely high selectivity towards ethylene can be obtained. Thus, nickel oxide supported on TiO2with high surface areas (i.e. 55 and 85 m2g−1) have resulted to give the best catalytic performance although the optimal nickel loading is different for each case. The optimal catalyst has been obtained for NiO-loadings up to 5–10 theoretical monolayers regardless of the TiO2employed. Free TiO2is inactive whereas unsupported NiO is active and unselective (forming mainly carbon dioxide) and, therefore, unmodified NiO particles have to be avoided in order to obtain the optimal catalytic performance. The use of low surface area titania (11 m2g−1) have led to the lowest selectivity to olefin due to the presence of an excess of free NiO particles.