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CO2와 Methanol로부터 Dimethyl Carbonate의 직접 합성시 복합산화물(Ce0.8Zr0.2O2)에 담지된 금속/산화물 촉매의 효과
이용상 ( Lee Yong Sang ),고재천 ( Go Jae Cheon ),김범식 ( Kim Beom Sig ),김광주 ( Kim Gwang Ju ),구기갑 ( Gu Gi Gab ) 한국공업화학회 2003 공업화학 Vol.14 No.7
이산화탄소와 메탄올로부터 Dimethyl carbonate (DMC)의 직접 합성법은 비교적 간단한 공정이지만, 열역학적으로 평형의 제약을 강하게 받는 가역반응이다. 본 연구에서는 DMC 합성을 위한 촉매로서 복합산화물 Ce_(0.8)Zr_(0.2)O₂를 제조하였고, 이것에 전이금속과 귀금속을 담지시켜 5% 수소 흐름 하에서 환원 처리한 후 반응성을 비교하였다. 그 결과, 전이금속인 니켈과 코발트는 환원처리 조건에 관계없이 DMC 생성에 우수한 활성을 보인 반면, 귀금속인 백금과 팔라듐은 수소환원 처리시 활성이 급격히 감소하였다. 이는 메틸 알콜의 산화반응에 침착된 금속의 산화상태가 활성에 많은 영향을 주고 있음을 확인하였다. Direct synthesis of DMC from CO_(2) methanol is a relatively simple reversible reaction. while its conversion is limited due to thermodynamic restrictions. In the present experiments, the mixed oxide catalysts (Ce_(0.8)Zr_(0.2)O_(2)) were impregnated with noble and transition metals to use for the synthesis of dimethyl carbonate from CO_(2) and methyl alcohol. Metal-impregnated catalysts were pretreated with 5% hydrogen gas prior to use in DMC formation. From experimental results, nickel and cobalt show high activity as transition metal in DMC formation independent of reduced treatment condition. Catalysts with platinum and palladium chosen as noble metals. however, showed low activity in DMC formation when treated under reduction condition. It implies that the pretreatment condition a noble metal catalysis is very crucial for the oxidation reaction of methyl alcohol.
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닭과 돼지에서 분리한 Salmonella Typhimurium의 항생제 내성 특성 분석
문자영 ( Ja Young Moon ),김원경 ( Won Kyong Kim ),이건희 ( Kun Hee Lee ),나방주 ( Bang Ju Na ),고재천 ( Jae Cheon Go ),심균섭 ( Kyun Seob Sim ),( Patil Trupti A ),허진 ( Jin Hur ) 한국동물위생학회 2016 韓國家畜衛生學會誌 Vol.39 No.1
Fifty and forty two Salmonella enterica subspecies enterica serovar 52 Typhimurium (ST) strains were isolated from chicken and pigs, respectively, collected from markets throughout Korea from 2008 to 2011. The isolates were investigated for the presence of antimicrobial resistance and multi-drug patterns. All 50 ST isolates from chicken and 42 ST isolates from pigs were resistant to at least one of 13 antibiotics used in this study, 92.0% of ST isolates from chicken and 88.1% of ST isolates from pigs were resistant to three or more antimicrobials. As many as 3 isolates of ST isolates from chicken were resistant to 11 of 13 antimicrobials tested in this study. Only one isolate of ST isolates from pigs was resistant to 10 of 13 antimicrobials. The ACSSuT resistance phenotype was observed in 34% of the 50 isolates and 23.8% of the 42 isolates. Especially, 1 isolate from pigs had the ACSSuTAu. The high rate of antimicrobial-resist and multi-drug resistant (MDR) ST isolation may give rise to crucial public health problems. Therefore, control of antimicrobial use, and continuous monitoring of antimicrobial resistance and MDR patterns among Salmonella isolates in chicken and pig farms is necessary to ensure public health.
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