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  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

Study on Dissolution Condition of Monsanto Catalyst

Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2001, v.14 no.4, pp.317-323
Choi, Kwang Soon
Lee, Chang Heon
Pyo, Hyung Yeol
Park, Yang Soon
Joe, Kih Soo
Kim, Won Ho
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Abstract

Dissolution procedures of Monsanto catalyst which has been used to produce acrylronitrile by ammoxidation of propylene have been studied. Optimum dissolution condition of the catalyst supported on silica was obtained by microwave digestion system with mixed of HCl, HF and <TEX>$H_2O_2$</TEX>. When a safety device was activated by increased pressure in microwave vessel, Bi, Fe, Mo, Sb and U were not volatilized even though silica was volatilized as <TEX>$SiF_4$</TEX>. Quantification results by this method were <TEX>$SiO_2$</TEX> <TEX>$50.5{\pm}0.4%$</TEX>, <TEX>$Sb_2O_3$</TEX> <TEX>$29.6{\pm}0.6%$</TEX>, <TEX>$UO_2$</TEX> <TEX>$10.2{\pm}0.1%$</TEX>, <TEX>$Fe_2O_3$</TEX> <TEX>$6.1{\pm}0.1%$</TEX>, <TEX>$MoO_3$</TEX> <TEX>$0.73{\pm}0.01%$</TEX> and <TEX>$Bi_2O_3$</TEX> <TEX>$0.49{\pm}0.01%$</TEX> by ICP-AES and the relative error was within <TEX>${\pm}10%$</TEX> except bismuth.

keywords
Monsanto catalyst, microwave digestion, HCl+HF+<TEX>$H_2O_2$</TEX>, ICP-AES


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