脱氢
丙烷
金属间化合物
催化作用
选择性
材料科学
吸附
无机化学
化学
物理化学
冶金
有机化学
合金
作者
Chenliang Ye,Peng Mao,Dehong Yang,Dingsheng Wang,Chen Chen,Yadong Li
标识
DOI:10.1007/s40843-022-2251-8
摘要
With the surge of shale gas, propane dehydrogenation becomes increasingly important to synthesize propylene. Herein, a new type of ordered PtSnZn intermetallic clusters (∼0.9 nm) supported on Al2O3 was synthesized by a stepwise approach including electrostatic adsorption and temperature-programmed reduction. The structure of the PtSnZn clusters results from a kinetically controlled process, and Pt atoms in the PtSnZn clusters are well isolated by Sn and Zn with Pt−Sn and Pt−Zn pairs. The PtSnZn/Al2O3 catalyst exhibits excellent catalytic performance for propane dehydrogenation, which achieves ∼100% propylene selectivity and keeps a high propane conversion (>40%) during stability testing. The catalytic performance of PtSnZn/Al2O3 is also significantly higher than that of Pt/Al2O3, PtSn/Al2O3, and PtZn/Al2O3. Experiments and theoretical calculations indicate that the Sn 5p and Zn 4s orbitals are hybridized with Pt 5d by forming Pt−Sn and Pt−Zn pairs, which leads to the d band center of Pt deviating from Fermi level (−2.81 eV). The shift of the Pt d band center significantly decreases the adsorption energy of propylene and prohibits further dehydrogenation, resulting in high propylene selectivity and stability.
科研通智能强力驱动
Strongly Powered by AbleSci AI