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이수언,이유진,김정랑,정순용 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.66 No.-
Due to the need for better methods to upgrade heavy oil, selective ring opening (SRO) of multi-ring aromatics to mono-aromatics has attracted great interest. The SRO reaction can be done by hydrogenation and hydrocracking, catalyzed by the metallic (from metal element) and acidic (from zeolite) functions of bifunctional catalysts. We investigated the effect of wet-impregnated Ni and W metals over Beta zeolite on the characteristics of metal and acid sites, and found the correlation with their catalytic performance for the SRO reaction of 1-methylnaphthalene as a representative multi-ring aromatics. Primarily, W metal species was estimated to be more active than Ni metal species for the SRO reaction. Based on fundamental insight into these bifunctional catalysts, we described a facile approach to enhance the yield of the SRO reaction employing NiW-loaded Beta zeolite catalysts with various Ni contents. The balance of the metallic and acidic functions was modified by variation of the Ni content, and gradually shifted the product distribution showing a close relationship between the SRO performance and Ni content. We expect that this study can provide a logical perspective for designing selective bifunctional catalysts based on a better understanding of the interaction between metal and zeolite characteristics.
이수언,김정랑,이유진,정순용 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Bi-functional catalyst system of metal and zeolitic acid is closely dependent on the balance of metallic and acidic functions. Here, we report a synthetic strategy to control the acid site distribution of Beta zeolite through the silylation reaction with varying alkyl chain groups of silylation agents. Resulting from the selectively deposited SiO<sub>2</sub> layer, NiW metal ssupported on each silylated Beta zeolite altered the metal distribution and further the balance of metallic and acidic function. NiW catalyst supported on TBOS-silylated Beta zeolite has shown the best catalytic performance toward the SRO reaction of 1-methylnaphthalene in a fix-bed reaction system, proving the optimal balance of metallic and acidic functions as the bi-functional catalysts and promoting properly aromatic saturation and ring opening for selective ring opening products.
Effect of Beta zeolite for propane dehydrogenation over Pt-Sn supported Beta zeolite
이수언,이유진,김정랑,정순용 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
The increasing global propylene demand has motivated the great attention on propane dehydrogenation (PDH) for on-purpose propylene production. However, rapid deactivation of catalysts due to coke deposition and metal catalyst sintering limits an industrial application. As a promising candidate, Pt-based catalysts have been widely studied with various supports to improve metal catalyst dispersion and coke resistance. In this work, we focused on the PDH catalytic properties of Beta zeolites as a support for Pt-Sn based catalysts because zeolite is advantageous of large surface area and acid sites for high metal dispersion and promoting catalytic activity. Based on understanding physicochemical properties and reaction mechanism of Pt-Sn supported Beta zeolite, a typical reaction trend as reaching the highest propylene selectivity after a certain amount of reaction time was revealed.
이수언,정준기,김현집,문경윤,장태안 대한척추신경외과학회 2009 Neurospine Vol.6 No.3
Vertebral hemangioma is relatively common, but rarely extends into the epidural space and causes neurological deficits. This case report describes a 69-year-old woman with vertebral hemangioma extending into the epidural space causing spinal cord compression. The patient presented with low back pain and progressive weakness of the left lower extremity over a period of 1 year. Radiologic findings revealed a dural encasing vertebral hemangioma with spinal cord compression at the T11 level. After T11 vertebroplasty, the lesion was subtotally removed by T10-11 total laminectomy. The patient regained motor power of the left lower extremity postoperatively. And no further tumor growth was observed at last follow-up. This combination of intraoperative vertebroplasty and decompressive laminectomy offers a viable treatment modality for a dural encasing vertebral hemangioma with epidural extension causing cord compression. Vertebral hemangioma is relatively common, but rarely extends into the epidural space and causes neurological deficits. This case report describes a 69-year-old woman with vertebral hemangioma extending into the epidural space causing spinal cord compression. The patient presented with low back pain and progressive weakness of the left lower extremity over a period of 1 year. Radiologic findings revealed a dural encasing vertebral hemangioma with spinal cord compression at the T11 level. After T11 vertebroplasty, the lesion was subtotally removed by T10-11 total laminectomy. The patient regained motor power of the left lower extremity postoperatively. And no further tumor growth was observed at last follow-up. This combination of intraoperative vertebroplasty and decompressive laminectomy offers a viable treatment modality for a dural encasing vertebral hemangioma with epidural extension causing cord compression.
Three-Dimensional Silicon Electronic Systems Fabricated by Compressive Buckling Process
이수언,진호준,성한상,고영천,박준현,정민규,김봉훈 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
The work reported here establishes further capabilities for directly embedding high-performance electronic devices into the resultant 3D constructs based on silicon nanomembranes as the active materials in custom devices or microscale components released from commercial wafer sources. Systematic experimental studies and theoretical analysis illustrate the key ideas through varied 3D architectures, from interconnected bridges and coils to extended chiral structures, each of which embed n-channel Si NM MOSFETs, Si NM diodes, and p-channel silicon MOSFETs. Examples in stretchable/deformable systems highlight additional features of these platforms. These strategies are immediately applicable to other wide-ranging classes of materials and device technologies that can be rendered in two-dimensional layouts, from systems for energy storage, to photovoltaics, optoelectronics, and others.
이수언,이유진,김정랑,정광은,정순용 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
As an alternative way to replace the usage of limited oil resources, methanol to olefin (MTO) conversion has been investigated for pro ducing light olefins from abundant natural gas, coal, and biomass. Silicoaluminophosphate (SAPO)-34 is a representative catalytic material in the MTO conversion with highly selectivity for light olefins, due to cylinder-like cages with small 8-ring pore openings restricting the release of large hydrocarbons. However, the SAPO-34 cages result in the diffusion limitation causing a fast coke deposition and thus catalytic deactivation. Here, we suggested the synthetic strategy for submicro-sized cobalt (Co)- substituted SAPO-34 with controlled Co content through milling and Co-incorporated recrystallization. Ultimately, the effect of milling and Co-substitution on the catalytic lifetime was investigated with the understanding the modified particle size, ore structure and acidity.