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페라이트 계열 촉매를 이용한 이산화 탄소로 부터 경질 올레핀의 합성
곽자훈 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
화석연료의 사용에 따른 이산화탄소의 증가로 인한 지구 온난화는 현재 인류가 직면한 가장 중요한 환경 문제의 하나로 CO2 감축을 위한 많은 노력이 현재 진행 중이다. 그동안 많은 연구가 진행되어 왔던 CCS에서 나아가 이산화탄소를 고부가 가치를 지니는 석유화학 원료로 전환하는 탄소 자원화는 환경적 측면과 경제적 측면을 동시에 해결 가능한 방안으로 많은 연구가 진행되고 있다. 특히 석유화학의 가장 중요한 원료 물질인 경질 올레핀으로 전환하는 것은 가장 바람직한 방안중의 하나이나 이산화탄소의 전환율, 올레핀 선택성 등 많은 부분이 미흡한 상태로 연구개발을 통한 개선의 필요성이 높은 상황으로 판단된다. 이 발표에서는 울산 과기원에서 진행하고 있는 페라이트 계열 촉매를 이용한 이산화탄소로 부터 경질 올레핀을 제조하는 촉매에 대한 최근의 진행상황 및 앞으로의 연구방향에 대하여 이야기 하고자 한다.
Pd/SiO2 as an active and durable CH4 oxidation catalyst for vehicle applications
Dong Gun Oh,이재경,김은석,장은정,김지만,곽자훈 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
The removal of CH4 is critical to address environmental concerns for developing natural gas vehicles(NGVs), because CH4 has a 20-fold-greater contribution to the greenhouse effect than CO2. Aluminasupported Pd catalysts are widely used for CH4 oxidation due to their superior catalytic activity anddurability compared to other CH4 oxidation catalysts. However, the continuous deactivation of Pd-basedcatalysts during vehicle applications needs further development of active and durable catalysts. Here, wereport that Pd/SiO2 can be active and durable catalysts for CH4 oxidation in practically relevant conditionvia a simple reductive regeneration. CH4 oxidation light-off curves of freshly prepared Pd/SiO2 (air, 550C) present higher activity than those of Pd/Al2O3, but severe deactivation was observed afterhydrothermal aging (HTA, air with 10% H2O) at 850 C. However, X-ray diffraction (XRD), scanningtransmission electron microscopy (STEM) and volumetric CO adsorption suggest that Pd/SiO2 has similarparticle sizes as Pd/Al2O3 even after HTA, indicating that Pd/PdO particle sintering is not the origin of thedeactivation of Pd/SiO2. Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) shows thatthe CO was not adsorbed on Pd/SiO2 after HTA, whereas it was adsorbed on Pd/Al2O3 after HTA. Theseresults demonstrate that the deactivation of Pd/SiO2 originates mainly from the blockage of the Pd/PdOsurface by the SiO2 overlayer formed during HTA. The Pd/PdO surfaces are re-exposed by a simple H2treatment at 500 C, resulting in CO adsorption on the Pd/PdO surface and regeneration for CH4 oxidationactivity, which suggests that the Pd/PdO surface was re-exposed by a reduction treatment. This work alsodemonstrates that SiO2-supported Pd catalysts can be a good candidate for active and durable CH4oxidation catalysts by using the proper regeneration protocols
Template free facile synthesis of mesoporous mordenite for bulky molecular catalytic reactions
Bhupendra Kumar Singh,김용선,백승빈,Abhishek Meena,Siraj Sultan,곽자훈,김광수 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
The synthesis of highly stable mesoporous zeolites is one of the great challenges in materials science. Soft and hard templating methods have widely been applied to synthesize mesoporous zeolites having different pore diameters and structures. Here, we report a facile and template free hydrothermal synthesis of mesoporous mordenite (MOR) by controlling synthesis conditions. The small nanoparticles of ∼50–80 nm were self-assembled into 2–3 μm MOR. Intracrystalline mesopores of ∼3–5 nm were abundantly observed throughout the MOR nanoparticles. Synthesized mesoporous MOR demonstrated significantly improved catalytic efficiencies (∼100%), 3–5 times higher than its conventional counterparts (CBV 10A and CBV 21).