Selective and Stable Non-Noble-Metal Intermetallic Compound Catalyst for the Direct Dehydrogenation of Propane to Propylene
Selective and Stable Non-Noble-Metal Intermetallic Compound Catalyst for the Direct Dehydrogenation of Propane to Propylene
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DOI：
10.1021/jacs.8b05060
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发表时间：
2018-10-31
影响因子：
15
通讯作者：
Laursen, Siris
中科院分区：
文献类型：
--
作者：
He, Yang;Song, Yuanjun;Laursen, Siris
以Al_2O_3为载体的非贵金属间化合物催化剂在600℃下丙烷直接脱氢制丙烯反应中表现出较高的选择性(接近94%)、相当的活性(TOF=4.7×10~(-2)S(-1))、良好的稳定性(接近94%~81%)和再生性。通过稳定Ni3Ga相的合成技术，可以通过负载Ni和Ga来调整催化纳米颗粒的表面组成，从而提高对丙烯的选择性。与Ni：Ga负载量范围内的Ni3Ga、Ni3Ga和Ni3Ga/Al_2O_3催化剂的比较表明，特定的表面组成范围最适合于丙烯的生产。活性粒子表面Ni的存在对于推动脱氢和提高转化率也是关键的，而Ga的存在对于减弱表面的反应活性以提高选择性和催化剂的稳定性是必要的。
A non-noble intermetallic compound catalyst consisting of Ni3Ga nanoparticles supported on Al2O3 that exhibits high selectivity (similar to 94%), comparable activity (TOF = 4.7 X 10(-2) s(-1)), good stability (similar to 94% to 81% over the 82 h test), and regenerability in the direct dehydrogenation of propane to propylene at 600 degrees C has been developed. Through synthesis techniques that stabilize the Ni3Ga phase, the surface composition of the catalytic nanoparticles could be tuned by Ni and Ga loading such that improved selectivity toward propylene may be achieved. Comparisons with well-defined silica supported Ni3Ga and NiGa catalysts and Ni3Ga/Al2O3 with a range of Ni:Ga loading suggested that a specific surface composition range was most promising for propylene production. The presence of Ni at the active particle surface was also found to be critical to drive dehydrogenation and enhance conversion, whereas the presence of Ga was necessary to attenuate the reactivity of the surface to improve selectivity and catalyst stability.