• Title/Summary/Keyword: H zoelite Y

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Synthesis of Conjugated Linoleic Acid Methylester using Heterogeneous Catalysts (불균일계 촉매에 의한 공액 리놀레산 메틸에스테르의 합성)

  • Yuk, Jeong-Suk;Lee, Sang-Jun;Kim, Nam-Kyun;Kim, Young-Wun;Yoon, Byeong-Tae
    • Applied Chemistry for Engineering
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    • v.24 no.3
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    • pp.291-298
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    • 2013
  • Conjugated linoleic acid methylester was synthesized through isomerization of linoleic acid methylester by using heterogeneous catalysts. As for heterogeneous catalysts, Ni supported zeolite type catalysts were used. H zoelite Y (HY) were ion exchanged with KCl aqueous solution to synthesize K zeolite Y (KY), and with impregnation method, Ni supported zeolite catalysts were synthesized. Catalysts were used after pre-treatment by using hydrogen. HY catalysts showed a high conversion at low temperatures; but a low selectivity for conjugation reaction. KY catalysts showed a low conversion at low temperatures; but a similar conversion with HY catalysts at high temperatures while a high selectivity at low temperatures. As a result, 4 wt% Ni/KY720 recorded the high conjugation yield of 63.4% at 220.

Acid Treatment of Melting Slag and Its Hydrothermal Reaction (산처리한 생활폐기물 용융슬래그의 수열반응 특성)

  • Lee, Sung-Ki;Jang, Young-Nam;Chae, Soo-Chun;Ryu, Kyoung-Won;Bae, In-Kook
    • Journal of the Mineralogical Society of Korea
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    • v.20 no.4
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    • pp.267-275
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    • 2007
  • Melting slag generated from municipal-incinerator ash contains lots of impurities which have adverse effects on zeolite synthesis. These impurities are detrimental to zeolite synthesis, and the yield and purity of zeolite was decreased. And thus its performance is lowered. In melting slag, there are lots of components such as $Fe_2O_3$, FeO and CaO. To remove these impurities, we treated the melting slag with hydrochloric acid at initial pH 1, 3, 5, and 7. After the treatment, the $SiO_2,\;Fe_2O_3,\;and\;TiO_2$ ratios increased, but the $Al_2O_3,\;FeO,\;CaO,\;Na_2O$ and MgO ratios decreased. We reacted these treated slag in a NaOH solution under hydrothermal conditions at $80^{\circ}C$. The hydrothermal products from the slag and the slag treated at pH 7 and pH 5 were determined to be tobermorite, whereas those at pH 3 and pH 1, Na-P1 and Na-X zoelite respectively. CaO was found to inhibit the synthesis of zeolite.