title: Mesoporous siliconiobium phosphate as a pure Brønsted acid catalyst with excellent performance for the dehydration of glycerol to acrolein.
abstract: The development of solid acid catalysts that contain a high density of Brønsted acid sites with suitable acidity, as well as a long lifetime, is one of great challenges for the efficient dehydration of glycerol to acrolein. Herein, we report on a mesoporous siliconiobium phosphate (NbPSi-0.5) composite, which is a promising solid Brønsted acid that is a potential candidate for such a high-performance catalyst. A variety of characterization results confirm that NbPSi-0.5 contains nearly pure Brønsted acid sites and has well-defined large mesopores. In addition, NbPSi-0.5 contains a similar amount of acid sites and exhibits weaker acidity than that of the highly acidic niobium phosphate and HZSM-5 zeolite. NbPSi-0.5 is quite stable and has a high activity for the dehydration of glycerol. The stability of NbPSi-0.5 is about three times higher than that of the reported catalyst. The significantly enhanced catalytic performance of NbPSi-0.5 can be attributed to 1) nearly pure Brønsted acidity, which suppresses side reactions that lead to coke formation; 2) a significant reduction of pore blocking due to the mesopores; and 3) a decrease in the amount and oxidation temperature of coke.
authors.affiliation: World Class University Program of Chemical Convergence for Energy & Environment, Institute of Chemical Processes, School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Youngbo
authors.initials: Y
authors.lastname: Choi
authors.forename: Dae Sung
authors.initials: DS
authors.lastname: Park
authors.forename: Hyeong Jin
authors.initials: HJ
authors.lastname: Yun
authors.forename: Jayeon
authors.initials: J
authors.lastname: Baek
authors.forename: Danim
authors.initials: D
authors.lastname: Yun
authors.forename: Jongheop
authors.initials: J
authors.lastname: Yi
mesh_terms: D000143:Acids / Q000737:chemistry*; D000171:Acrolein / Q000737:chemistry*; D056804:Biofuels; D018533:Biomass; D002384:Catalysis; D003681:Dehydration; D005990:Glycerol / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D009556:Niobium / Q000737:chemistry*; D010710:Phosphates / Q000138:chemical synthesis* / Q000737:chemistry; D016062:Porosity; D012825:Silicon / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D017641:Zeolites / Q000737:chemistry
chemical_list: D000143:Acids; D056804:Biofuels; D010710:Phosphates; D009556:Niobium; D017641:Zeolites; D000171:Acrolein; D005990:Glycerol; D012825:Silicon