• Title/Summary/Keyword: 메조포러스

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Hydrogenation Characteristics of Aromatics in Residue Oil of Naphtha Cracking on Pt/Pd Impregnated Mesoporous Molecular Sieve (메조포러스 분자체에 담지된 Pt/Pd 촉매상에서 납사분해 잔사유의 방향족 화합물 수소화 특성)

  • Choi, Jong Hwa;Jeong, Soon Yong;Oh, Sung-Geun
    • Korean Chemical Engineering Research
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    • v.43 no.6
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    • pp.675-682
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    • 2005

  • Al containing mesoporous molecular sieve (Al-MMS) was synthesized by hydrolysis of $H_2SiF_6$ and $Al(NO_3)_3{\cdot}9H_2O$. The material obtained was characterized by XRD, $N_2$-physisorption. The specific surface area was $981m^2/g$, and the average pore size was uniformity $39{\AA}$. It was confirmed that the acidity of Al-MMS was milder than that of zeolite Y based on the results of $NH_3$-TPD. Active materials, Pt and Pd, were loaded on Al-MMS in order to examine the feasibility of using Al-MMS as a catalyst support in the hydrogenation of aromatic compounds included in the residue oil of a naphtha cracker. The hydrogenation activity of PtPd/Al-MMS has been studied by following the kinetics of the hydrogenation of naphthalene, and by comparing the kinetic parameters obtained with Pt and Pd catalysts supported on the other mesoporous material support and commercial conventional support materials. PtPd/Al-MMS catalyst shows the highest activity of hydrogenation and sulfur resistance. The high activity of PtPd/Al-MMS was confirmed again in the hydrogenation of PGO (pyrolized gas oil), which is residue oil obtained from a naphtha cracker. Therefore, PtPd/Al-MMS can be applied to the hydrogenation of aromatic compounds included in the residue oil of a commercial naphtha cracker commericially.

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Preparation of Mesoporous Titanium Oxides by Template Synthesis and Phase Transition of TiO2 inside Mesoporous Silica (주형합성을 통한 메조포러스 TiO2 제조 및 실리카 메조포어 내부에서의 TiO2 상전이 거동 변화)

  • Bang, Gyeong-Min;Kim, Young-Ji;Kim, Seung Han;Choi, Yerak;Lee, In Ho;Ko, Chang Hyun
    • Korean Chemical Engineering Research
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    • v.56 no.2
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    • pp.261-268
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    • 2018

  • To prepare mesoporous $TiO_2$ ($meso-TiO_2$) with anatase and rutile crystal structures, hydrothermal and template synthesis were used. $Meso-TiO_2$ with anatase structure was obtained by hydrothermal synthesis. The crystal structure of $meso-TiO_2$ by hydrothermal synthesis converted from anatase to rutile by simple heating at $600^{\circ}C$ and above. However, their mesopore structure collapsed due to phase transition. To prepare $meso-TiO_2$ with rutile structure, template synthesis method was applied using mesoporous silica KIT-6 as a template. Once we incorporated anatase $TiO_2$ inside mesopores of silica, the phase transition temperature of $TiO_2$ confined inside KIT-6 was much higher ($900^{\circ}C$) than that of free-standing $TiO_2$ ($600^{\circ}C$). The suppression of $TiO_2$ phase transition inside mesopores of KIT-6 is closely related with the interaction between $TiO_2$ surface and silica walls in KIT-6 because oxygen vacancy in $TiO_2$ is regarded as the starting point for phase transition. After removal of silica template by NaOH solution washing, $meso-TiO_2$ with mixed phase between anatase and rutile was obtained.

  • https://doi.org/10.9713/kcer.2018.56.2.261 인용 PDF KSCI

Synthesis of HMS using Fly ash (석탄회재를 이용한 HMS의 합성)

  • Kim, Song-Yee;Lee, Ji-Youn;Kim, Hyeon-Jeong;An, Na-Yeong;Wagle, Roshan;Jang, Hyun-Tae
    • Proceedings of the KAIS Fall Conference
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    • 2008.11a
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    • pp.382-385
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    • 2008

  • 본 연구에서는 석탄회재를 이용하여 메조 포러스 실리카를 제조하였다. 제조된 메조포러스 실리카는 X-선 회절패턴, TEM, FT-IR을 통하여, HMS특성과 동일하게 나타났으며 결과적으로 메조 포러스 실리카 물성에 가장 영향을 나타내는 것은 반응온도, 시간이며 석탄 회재의 규소용출은 소성온도가 낮을수록 증가하며 규소원에 따라 각기 다른 특성을 나타냄을 합성된 메조포러스 실리카의 물리화학적 특성으로 부터 알 수 있었다.

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