期刊
JOURNAL OF CHEMICAL EDUCATION
卷 94, 期 6, 页码 781-785出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jchemed.6b00718
关键词
Upper-Division Undergraduate; Inorganic Chemistry; Laboratory Instruction; Hands-On Learning/Manipulatives; Materials Science; Solid State Chemistry; Synthesis; X-ray Crystallography; NMR Spectroscopy; Gravimetric Analysis
资金
- Villum Foundation via the Villum Young Investigator Program [VKR022364]
- Villum Fonden [00007169] Funding Source: researchfish
Zeolite Y has an iconic crystal structure, but more importantly, the hydrogen modification zeolite H-Y is the classic example of a solid acid which is used extensively as a catalyst in the oil industry. This metastable compound cannot be synthesized directly, which creates an opportunity to discuss various preparative strategies with the students, such as the three -stage procedure described here. Stage I concerns the hydrothermal synthesis of zeolite Na Y, followed by ion -exchange with an ammonium acetate solution to form zeolite NH4-Y, and the latter is subsequently converted to zeolite H-Y by thermolysis. Stages II and III may instead be performed using commercially available zeolites, Na-Y and NH4-Y, respectively, which shifts the learning objectives to structural characterization of zeolites. The characterization of the product and intermediate materials gives the students a practical insight into the applicability and limitations of powder X-ray diffraction, solid-state nuclear magnetic resonance spectroscopy, and thermogravimetric analysis, and how these analytical tools complement each other. These aspects make its synthesis and characterization an ideal practical exercise for an upper -level undergraduate laboratory in inorganic or materials chemistry courses. Moreover, the methods and skills learned during this experiment enable the students to tackle more complex zeolites and related framework materials.
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