ผลของตัวเร่งปฏิกิริยาซีโอไลต์ชนิด FAU BEA และ MFI ต่อการแตกตัวเชิงเร่งปฏิกิริยาของอะคริลิก
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Abstract
The purpose of conducting research was to study the effect of heterogeneous catalyst, namely FAU-, BEA- and MFI-type zeolites on the catalytic cracking of acrylic to recover monomer or valuable substances using a high-pressure batch reactor under oxygen-free atmosphere. The results showed that the cracking of acrylic at a temperature of 300 oC could occur in the presence of zeolites. Acidity of three different types of zeolites seemed to vary dependently on framework structures, in spite of their quite equivalent SiO2/Al2O3 ratios. The degree of zeolites acidity significantly influenced the product distribution in gaseous, liquid and solid form whilst the composition of the liquid fraction directly related to the shape selectivity of the zeolites. FAU type zeolite was found to be the most appropriate catalyst for recovery of monomer or valuable substances including methyl methacrylate monomer since it yielded highest liquid products up to 83 weight percentages whereas MFI type zeolite with high acidity was effective in producing gaseous and solid products. In this research, approximately 21 to 26 weight percentages of monomer could be recovered, depending on the zeolite used.
Keywords: catalytic cracking; zeolite; catalyst; acrylic
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References
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