• Title, Summary, Keyword: 인산화반응

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Oxidative Dehydrogenation of 1-butene over BiFe0.65MoP0.1 Catalyst: Effect of Phosphorous Precursors (BiFe0.65MoP0.1 촉매 상에서 1-부텐의 산화탈수소화 반응 : 인 전구체의 영향)

  • Park, Jung-Hyun;Youn, Hyun Ki;Shin, Chae-Ho
    • Korean Chemical Engineering Research
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    • v.53 no.6
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    • pp.824-830
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    • 2015
  • The influence of phosphorous precursors, $NH_4H_2PO_4$, $(NH_4)_2HPO_4$, $H_3PO_4$, $(C_2H_5)_3PO_4$, and $P_2O_5$, on the catalytic performance of the $BiFe_{0.65}MoP_{0.1}$ catalysts in the oxidative dehydrogenation of 1-butene to 1,3-butadiene was studied. The catalysts were characterized by XRD, $N_2$-sorption, ICP, SEM and TPRO analyses. It was not observed big difference on the physical properties of catalysts in accordance with used different phosphorous precursors, however, the catalytic performance was largely depended on the nature of the phosphorous precursors. Of various precursors, the $BiFe_{0.65}MoP_{0.1}$ oxide catalyst, which was prepared from a phosphoric acid precursor, showed the best catalytic performance. Conversion and yield to butadiene of the catalyst showed 79.5% and 67.7%, respectively, after 14 h on stream. The cation of phosphorous precursors was speculated to affect the lattice structure of the catalysts during catalyst preparation and this difference was influenced on the re-oxidation ability of the catalysts. Based on the results of TPRO, it was proposed that the catalytic performance could be correlated with re-oxidation ability of the catalysts.

Apatite Formation Behavior on Bioactive Glasses with Glass Composition and Reaction Solution (생체유리에서 유리조성과 반응용액에 따른 아파타이트 형성)

  • 이재희;이정웅;김철영
    • Journal of the Korean Ceramic Society
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    • v.37 no.11
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    • pp.1105-1113
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    • 2000
  • Bioglass 조성 중 45S5 (46.1SiO$_2$.24.4$Na_2$O.26.9CaO.2.6P$_2$O$_{5}$ : 몰비)를 기본 조성으로 하여 46P4 (46.2SiO$_2$.49.5CaO.4.3P$_2$O$_{5}$ : 몰비), 46SF (46.1SiO$_2$24.4$Na_2$O.16.1CaO.2.6P$_2$O$_{5}$.10.8CaF : 몰비) 그리고 55SF (55.1SiO$_2$.9.2$Na_2$O.27.8CaO.3.4P$_2$O$_{5}$.4.5CaF : 몰비)를 제조하여 tris-완충용액 및 유사 생체용액(simulated body fluid)에서 반응시킨 후 생체활성유리의 표면에 생성되는 아파타이트 결정형에 관하여 연구하였다. 45S5 유리를 tris-완충용액에 반응시켰을 경우 6시간 반응시부터 수산화 아파타이트가 생성되었으나 유사 생체용액에 반응시켰을 경우에는 24시간까지도 수산화 아파타이트 결정이 생성되지 못하고 비정질 상태의 칼슘 인산염만 형성되었다. tris-완충용액에 각 조성의 유리를 200시간 반응시킨 경우 불소를 함유하지 않은 유리에서는 잎사귀 모양의 수산화 아파타이트가, 불소를 함유한 유리에서는 구상의 플루오르 아파타이트가 형성되었다. 그러나 유사 생체용액에 각 조성의 유리를 200시간 반응시켰을 경우 불소를 함유하지 않은 유리에서는 누에고치형의 수산화 아파타이트가 형성되었고 불소를 함유한 유리에서는 무정형의 칼슘 인산염이 생성되었다.

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Comparison of Physicochemical Properties of Starch Phosphates Prepared by Dry Heating and Extrusion Process (건식법과 Extrusion 공정에 의해 제조한 인산전분의 이화학적 성질 비교)

  • Kim, Chong-Tai;Ryu, Gi-Hyung;Kim, Dong-Chul;Kim, Chul-Jin
    • Korean Journal of Food Science and Technology
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    • v.22 no.6
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    • pp.651-658
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    • 1990
  • Starch phosphates were prepared by dry heating, gelatinizing method and extrusion process using sodium tripolyphosphote (STPP) as a substitution reagent and their physicochemical properities were compared. In the preparation of starch phosphate by dry heating method(DSP), the effect of reaction temperature was the most significant to the DS(Degree of substitution). In the phosphorylation reaction with gelatinized starch(GSP), the substitution ratio was increased with increasing the reaction temperature, but the increase was insignificant above $85^{\circ}C$. By extrusion with the corn starch containing 2.0% STPP at various moisture contents of 20, 25 and 30%, the DS values of extrudate(WESP) were within the range of between 0.0066 and 0.0083. The starch phosphate(DSP) products showed lowering the gelatinization temperature, increasing the clarity of the starch paste. However, WESP showed higher gelatinization temperature than that of raw starch. The starch phosphate prepared by extrusion process showed lower apparent viscosity of paste than that of the DSP at same condition. All of starch phosphates showed reducing the tendency of the paste retrogradation.

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Dephosphorylation Study of Phosphorylated Myelin Basic Protein: A Model Substrate for Protein Phosphatase (인산화된 신경수초 염기성 단백질의 탈인산화 연구: 단백질 탈인산화 효소의 기질 모델)

  • Kim, Jin Hahn;Choi, Myung Un
    • Journal of the Korean Chemical Society
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    • v.41 no.4
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    • pp.205-209
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    • 1997
  • The site specificity of dephosphorylation of myelin basic protein(MBP) was studied in vitro. To assign amino acid site of dephosphorylation, MBP was phosphorylated by protein kinase C(PKC) and dephosphorylated by protein phosphatase PP2A. The phosphorylated MBP was digested by trypsine and the digested peptides were separated by a reverse phase HPLC chromatography. The radioactivity of each fraction was counted and partially sequenced. Seven radioactive peptides were observed and $Ser^{55}$ in the second peak($P_2$) shows the best susceptibility for the phosphorylation. However in the dephosphorylation, the fifth peak($P_5$) appeared to release it's phosphate group most rapidly. This result demonstrates that MBP is a suitable substrate for protein phosphatase.

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Long-term teaching Characteristics of Hexavalent Chromium Contaminated Soils Treated with Phosphate and Chromium Reducing Agent (크롬환원제와 인산염으로 처리된 6가 크롬 오염토양의 장기용출 특성)

  • Lee Eui-Sang
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.7 no.3
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    • pp.448-452
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    • 2006
  • This study was performed to evaluate the long-term teachability of the stabilized hexavalent chromium contaminated soils treated with chromium reducing agent and soluble phosphate. The study shows that $Cr^{6+}$ in the leachate was little detected and the remaining $PO_4-P$ concentration kept below 0.1 mg/L due to the formation of geochemically stable hexavalent chromium phosphate minerals from the reactions of labile soil $Cr^{6+}$ forms with the added soluble phosphate salt and chromium reducing agent. The results provide evidence for the potential use of the immobilization technique for the hexavalent chromium contaminated soil remediation in the near future.

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Inhibitory Effect of Semen Sinapis Albae on Immediate Hypersensitivity Reaction (백개자의 즉시형 과민 반응에 대한 억제 효과)

  • Lee, Kyou-Young;Hong, Chul-Hee
    • The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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    • v.27 no.4
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    • pp.177-188
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    • 2014
  • 목적 : 본 연구에서는 백개자 열수추출물이 활성화된 대식세포 및 사람 비만세포주, HMC-1에서 염증 반응을 효과적으로 억제하는가를 관찰하고자 하였다. 방법 : 대식세포에 여러 농도의 백개자 열수추출물을 가한 뒤 LPS로 염증을 유도하여 NO 생산, iNOS와 COX-2 단백질 발현을 관찰하였으며 HMC-1에도 여러 농도의 백개자 열수추출물을 가한 후 PMACI로 염증을 유도하여 histamine 분비와 NF-${\kappa}B$ 활성 및 $I{\kappa}B$-${\alpha}$의 인산화, MAPKs pathway에 대한 저해효과를 관찰하였다. 결과 : 백개자 열수추출물은 대식세포에서 LPS로 유도된 NO 생성 및 INOS, COX-2 단백질 발현을 농도 의존적으로 저해하였으며 HMC-1에서 PMACI로 유도된 histamine의 분비와 p38 MAPK, ERK, JNK의 인산화 반응 및 $I{\kappa}B$-${\alpha}$의 인산화와 NF-${\kappa}B$의 활성을 저해하였다. 결론 : 백개자 열수추출물은 대식세포 및 비만세포의 활성을 저해함으로써 알레르기 질환의 치료에 사용될 잠재성이 크다고 사료된다.

Synthesis of ion Exchange Fiber Containing Amidoxime and Phosphoric Acid Groups and Its Uranium Adsorption Properties (아미드옥심기와 인산기가 함유된 이온 교환 섬유의 합성 및 우라늄 흡착 특성)

  • 황택성;박진원
    • Polymer Korea
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    • v.27 no.3
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    • pp.242-248
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    • 2003
  • PP-g-(AN/Sty) was synthesized by grafting with acrylonitrile (AN) and styrene (Sty) onto PP staple fiber using an electron beam accelerator and followed by amidoximination and phosphorylation. Mole fraction of AN in the graft chain increased with the increase of the AN content in the monomer mixture. The highest AN grafting yield of 45% was obtained at a monomer ratio of 40 vol% AN/60 vol% Sty. Mole fraction of AN in the graft chain decreased with the increase of methanol amount used its solvent. As reaction temperature increased, the grafting yield of copolymer increased and reached equilibrium at 50$^{\circ}C$. Amount of amidoxime group in fibrous ion exchanger was increased as increasing amount of hydroxylamine, and the maximum content of amidoxime group was observed at 5.8 mmol/g with the 9 wt% hydroxylamine concentration. Content of phosphorous group in fibrous ion exchanger increased up to 0.5 N phosphoric acid concentration, and then leveled off. The adsorption ability of the copolymer for uranyl ion by the chelating adsorbents was in the following order : bifunctional PP-g-(AN/sty) > amidoximated PP-g-(AN/Sty) > phosphorylated PP-g-(AN/Sty).

Immobilization Characteristics of Copper Contaminated Soil Using Phosphate(II) (인산염을 이용한 Cu 오염토양의 고정화 특성 연구 (II))

  • Lee, Eui-Sang;Kim, Ji-Young
    • Proceedings of the KAIS Fall Conference
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    • pp.400-402
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    • 2008
  • 본 연구는 오염토양 내 구리를 효과적으로 고정화시키는 조건을 찾고자 고정화제의 주입농도를 변화시켜가며 실험을 진행하였으며, 실험결과 고정화제의 주입농도가 높을수록 구리제거효율도 높아지는 것으로 나타났으며 3mole의 인산염을 주입했을 때 98%이상의 높은 제거효율을 보였다. 또한 잔류인의 농도를 낮추고 고정화반응을 촉진시키기 위해 알칼리제를 투입하였을 때, 알칼리제의 농도가 높을수록 구리오염 농도와 잔류인의 농도가 더욱 낮아짐을 알 수 있었다.

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Manufacture Technology of Monoammonium phosphate from LCD Waste Acid (LCD 제조공정의 혼합폐산으로부터 일인산암모늄 제조 기술)

  • Lee, Ha-Young;Lee, Sang-Gil;Park, Sung-Kook;Kim, Ju-Han;Kim, Ju-Yup;Kim, Jun-Young
    • Clean Technology
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    • v.15 no.4
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    • pp.253-257
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    • 2009
  • The waste solution discharged form the LCD(Liquid Crystal Display) manufacturing process contains phosphoric acid, nitric acid, acetic acid and metal ions such Al and other impurities. In this study, vacuum evaporation and diffusion dialysis was developed to commercialize an efficient system for recovering the high-purity phosphoric acid and manufacturing monoammonium phosphate. By vacuum evaporation, almost 99% of nitric and acetic acid was removed. Also, by diffusion dialysis, about 97.5% of Al was removed. Monoammonium phosphate was manufactured from purified phosphoric acid and ammonium hydroxide. In order to get the optimum manufacturing condition, the molar ratio of ammonium hydroxide and phosphoric acid, pH and temperature was controlled. Using this optimum condition, we obtained the recovery rate of monoammonium phosphate of about 90%.

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Study on the Facile Preparation of S-2-(${\omega}$-aminoalkylamino) ethyl Dihydrogen Phosphorothioates (티오인산이수소 S-2-(${\omega}$-아미노알킬아미노) 에틸들의 간편합성법 연구)

  • You Sun Kim;Suc Won Kim
    • Journal of the Korean Chemical Society
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    • v.27 no.6
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    • pp.449-456
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    • 1983
  • The facile route of preparing S-2-(${\omega}$-aminoalkylamino) ethyl dihydrogen phosphorothioates, potential chemical radioprotectants, have been studied. Intermediate 3-(2-phthalimidoethyl)-2-oxazolidinone was prepared by a reaction of potassium phthalimide and 3-(2-bromoethyl)-2-oxazolidinone, which was obtained through the alkaline ring closure of a mixture of carbonate and 2,2'-dibromo diethylamine prepared from diethanolamine. This was converted to N-[2-(2-bromoethylamino)ethyl] phthalimide hydrobromide by 30% HBr(gas) in acetic acid and N-(2-bromoethyl)-1,2-ethanediamine dihydrobromide was obtained by reacting the hydrobromide with a solution of HBr-HOAc. N-(2-bromoethyl)-1,3-propanediamine dihydrobromide could be prepared through the Cortese treatment of 2-(3-aminopropylamino) ethanol, which was prepared by a reaction of 1,3-diaminopropane and 2-chloroethanol. These dihydrobromides were treated by sodium thiophosphate in DMF to result S-2-(${\omega}$-aminoalkylamino) ethyl dihydrogen phosphorothioates. The characteristics of each reaction path were discussed in regards to reaction conditions and overall yields and a facile route of preparing each derivative was proposed.

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