화학공학소재연구정보센터
학회 한국화학공학회
학술대회 2015년 가을 (10/21 ~ 10/23, 일산 KINTEX)
권호 21권 2호, p.2187
발표분야 촉매 및 반응공학
제목 Unseeded Hydroxide-Mediated Synthesis and CO2 Adsorption Properties of an Aluminosilicate Zeolite with the RTH Topology
초록 We have synthesized an aluminosilicate RTH-type zeolite with Si/Al = 10 using 1,2,3-trimethylimidazolium (123TMI+) as an organic structure-directing agent (OSDA) together with Na+ or K+ in hydroxide media and without the use of seed crystals. The obtained zeolite is characterized by a cuboid morphology made of very small, ill-defined crystallites, largely different from the plank-like morphology typically observed for RTH-type zeolite crystals thus far. More interestingly, we show experimental evidence demonstrating that two  123TMI+ ions are located within each [46586484] cavity of the RTH framework, forming antiparallel dimers, as found by Rietveld refinement. When hydrothermally aged at 1023 K, Cu-RTH is much less active for NO reduction with NH3 than Cu-SSZ-13, the best catalyst known for this reaction to date. However, while the CO2 uptake (3.2 mmol g-1) on Na-RTH at 298 K and 1.0 bar is lower than that (4.5 mmol g-1) on zeolite Na-Rho, a well-studied small-pore zeolite that selectively adsorbs CO2, it exhibits much faster CO2 sorption kinetics. This renders our RTH zeolite potentially useful as a selective CO2 adsorbent.
저자 홍석봉1, Miguel A. Camblor2, 남인식1, 류태경1, 임종빈1, 조동희1
소속 1포항공과대, 2ICMM-CSIC
키워드 제올라이트
E-Mail sbhong@postech.ac.kr
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