3 years ago

Effect of Sn on Isobutane Dehydrogenation Performance of Ni/SiO2 Catalyst: Adsorption Modes and Adsorption Energies of Isobutane and Isobutene

Effect of Sn on Isobutane Dehydrogenation Performance of Ni/SiO2 Catalyst: Adsorption Modes and Adsorption Energies of Isobutane and Isobutene
Qingqing Zhu, Lushu Su, Guowei Wang, Jianwei Liu, Chunyi Li
The reaction of isobutane over Ni/SiO2 catalyst changes from hydrogenolysis to dehydrogenation when Sn is introduced. The adsorption modes and energies of isobutane and isobutene over the Ni/SiO2 catalyst with and without Sn addition were determined by in situ FTIR and a novel transient response adsorption approach. In the absence of Sn, isobutane is adsorbed in a double-site mode with H atoms in two methyl groups of isobutane, facilitating hydrogenolysis of isobutane. After the addition of Sn, a single-site adsorption mode with the H atom in the methylidyne group is speculated instead, which is beneficial to the rupture of the C–H bond rather than the C–C bond. Moreover, the double-site adsorption mode of isobutene with the C═C bond and the H atom in a methyl group is turned into single-site mode with the C═C bond after the introduction of Sn. As for the adsorption energy of isobutene, the introduction of Sn leads to an obvious decrease from 74 to 50 kJ mol–1 and facilitates the prompt desorption of isobutene, resulting in a high selectivity of 81.9 wt %.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b09482

DOI: 10.1021/acsami.7b09482

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