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산 추출 그리고/또는 수증기 처리 모더나이트 상에서 n-hexane의 전환반응
n-Hexane Conversion on Acid-leached and/or Steam-treated Mordenites
HWAHAK KONGHAK, August 1989, 27(4), 382-388(7), NONE
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Abstract
수소형 모더나이트[HM(10)]와 SiO2/Al2O3의 비가 22인 탈알미늄형 모더나이트[HM(22)] 및 이를 수증기 처리한 후 염산으로 세척하여 얻은 HM(10)S, HCl과 수증기 처리만 한 HM(22)s에 대하여 질소흡착량, X-선, 회절분석, NMR 분석 및 IR에 의한 암모니아 흡착량과 수산기 밴드로 특성을 측정하고 이 촉매에 대하여 n-헥산의 전환반응을 실시하였다. 그 결과 수소형 HM(10)과 산처리만 실시한 HM(22) 현저히 감소하였다. 암모니아 흡착량은 산처리와 수증기 처리로 감소하였으나 이 흡착량이 n-헥산의 전환 반응 활성과는 관계가 성립하지 않았다. 이성화 선택성은 수증기 처리한 시료에 대하여 큰 값을 보였다. 이성화 선택성으로 HM(10)S, HCl에서는 >C6가 그리고 HM(22)s에서는 3- 메틸펜탄의 생성이 각각 증가하였다.
Hydrogen mordenite[HM(10)], aluminum-deficient mordenite [HM(22)] (SiO2/Al2O3=22), and their steam-treated mordenites [HM(10)s,HCl, which is washed with hydrogen chloride solution after steam-treating, and HM(22)s] were prepared and characterized by measuring nitrogen adsorption capacities, XRD analysis, NMR studies, and IR studies on ammonia adsorption and hydroxyl bands. Catalytic reaction of n-hexane with hydrogen was carried out on these samples. HM(10) and HM(22) revealed fast deactivation rate, but elimination of IR 3600cm-1 band from these samples by steam-treating reduced the deactivation rate. The quantity of ammonia adsorption was reduced by steam-treating and acid-leaching, but the quantity showed on correlation with the activity of the n-hexane conversion. Isomerization selectivity was much improved by steam-treating. HM(22)s and HM(10)s,HClshowed high selectivity for 3-methyl pentane and>C6, respectively.
