1. Fuzhou Univ, Coll Chem, Inst Mol Catalysis & In Situ Operando Studies, Fuzhou 350108, Peoples R China
2. Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, 457 Zhongshan Rd, Dalian 116023, Peoples R China
3. Ningxia Univ, State Key Lab High Efficiency Utilizat Coal & Gre, Coll Chem & Chem Engn, Yinchuan 750021, Ningxia, Peoples R China
4. China Univ Petr East China, State Key Lab Heavy Oil Proc, Qingdao 266580, Peoples R China
折叠
Abstract
Catalytic conversion of propane to propylene can be achieved by non-oxidative propane dehydrogenation (PDH) by Pt-based catalysts under 550-700 degrees C. In this work, we report a strategy to decrease the Pt loading amount to only 0.1 wt% for obtaining a stable catalyst via silica coating for high PDH activity at a temperature as low as of 450 degrees C. The as-prepared 2.5%Si@PtGa/Al2O3 catalyst shows outstanding catalytic activity (propylene productivity rate 0.5 mol/g(cat).h) close to its equilibrium conversion (24.5%) with much better stability (deactivation constant: 0.007 h(-1)) at 450 degrees C. The interface between catalyst and silica coating changes the strong metal-support interaction (SMSI) to immobilize the Ga oxide clusters, further tightly anchoring the Pt catalytic sites for PDH process. Moreover, the electronic state of Pt is also influenced by the silica coating layers. This work demonstrates a new method to harnessing the metal-support interaction in catalysis.
NSTL
Elsevier