Interaction Mechanism of Ni(NO3)2·6H2O and P123 in Preparing Highly-Dispersed Ni/SBA-15 Catalytic Materials
MICROPOROUS AND MESOPOROUS MATERIALS(2016)
Innovative Catalysis ProgramKey Lab of Organic Optoelectronics & Molecular Engineering of Ministry of EducationDepartment of ChemistryTsinghua UniversityBeijing100084China
Abstract
P123 (PEG-PPG-PEG triblock copolymer) was employed as a modifying agent to prepare highly-dispersed Ni/SBA-15 via a simple wetness impregnation method. A detailed molecular-level pathway had been illuminated to interpret the role of P123 during the catalyst preparation process with Raman, 1H-NMR, UV–Vis, DLS, FTIR, and TPO measurements. There existed no interaction between Ni(NO3)2·6H2O and P123 during impregnation and evaporation steps with the existence of H2O in the media. The oxygen atoms of PEO blocks would coordinate with Ni2+, NO3− and H2O to form crown-ether-type complexes when the water was evaporated out from the solution during the drying step, which improved the dispersion and stabilization of the precursor. And the complexes ultimately inhibited the redistribution and affected the decomposition of Ni(NO3)2·6H2O precursor during calcination. All in all, the above specific interaction between Ni(NO3)2·6H2O and P123 would lead to a critical influence of P123 addition on the NiO dispersion on the support.
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Key words
Ni/SBA15-P123,Highly-dispersed,Interaction mechanism,Catalyst preparation process,Crown-ether-type complexes
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