载体形貌对Pt/CeO2催化剂甲醇蒸汽重整制氢性能的影响OA

Hydrogen energy is one of the key clean energy sources for achieving the"carbon neutrality"goal,so developing efficient and low-carbon hydrogen production processes is of vital importance.Methanol steam reforming(MSR)emerges as a promising technique for hydrogen production,yet challenges persist in achieving both high hydrogen yield and CO2 selectivity over noble metal-based catalysts.Herein,CeO2 supports with different morphologies of nanorods(CeO2-R)and nanocubes(CeO2-C)were prepared by hydrothermal method for constructing Pt/CeO2 catalysts(Pt/CeO2-R,Pt/CeO2-C).Combined with comprehensive characterization techniques,including HRTEM,XPS,and Raman spectroscopy,the morphology-dependent catalytic behavior in MSR reactions was studied.The results show that CeO2-R with exposure of dominant(111)facet exhibits more surface oxygen vacancies,generating abundant Ptδ+-Ov-Ce3+interfacial active sites(intrinsic active site).Under the conditions of 325℃,a methanol-water mixture feed flow rate of 0.02 mL/min(n(H2O):n(CH3OH)=3:1),and space velocity of 34800 mL/(g·h),Pt/CeO2-R achieves a hydrogen production rate of 490.35 mmol/(g·h)with CO2 selectivity of 92.9%.Under the same conditions,the CO2 selectivity is only 63.0%by Pt/CeO2-C.This study can provide valuable insights for the design of new high-efficiency MSR catalysts.