• Title, Summary, Keyword: Pd-Ir

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A Effect of H2O-H2 Pretreatment on VOCs Oxidation over Noble Catalysts on Titania (티타니아에 담지된 귀금속촉매의 H2O-H2 전처리에 따른 휘발성유기화합물 산화에 미치는 영향)

  • Kim, Moon-Chan;Ko, Sun-Hwan
    • Applied Chemistry for Engineering
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    • v.18 no.6
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    • pp.552-556
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    • 2007
  • In this study, noble metals (Pd, Ru, Ir) were supported to $TiO_2$ catalyst. In order to distribute metals uniformly, $H_2O-H_2$ pretreatment technique was used. Xylene, toluene, and MEK were used as reactants. The monometallic or bimetallic catalysts were prepared by the excess wetness impregnation method and were characterized by XRD, and XPS analysis. Pd-Ru, Pd-Ir bimetallic catalysts had multipoint active sites which improved the range of Pd metal state. Bimetallic catalysts had a higher conversion of VOCs than that of monometallic one. The effect of $H_2O-H_2$ pretreatment technique was the enhancement of uniform distribution of Pd particles and promotion of catalytic efficiency. In this study, addition of Ru and Ir metals to Pd promoted oxidation conversion of VOCs. In addition, $H_2O-H_2$ pretreatment promoted removal efficiency of VOCs on the $TiO_2$ support.

Radiation Dose Calculation using MIRD TYPE PHANTOM in the Surrounding Organs during Brachytherapy of Breast Cancer (유방암의 근접치료 시 수학적 모의피폭체를 이용한 인접장기의 선량평가)

  • Park, Eun-tae;Kim, Jung-hoon;Im, In-chul
    • Journal of the Korean Society of Radiology
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    • v.10 no.4
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    • pp.271-278
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    • 2016
  • This study was fulfilled to evaluate the absorbed dose of breast and adjacent organs using MIRD type phantom in brachytherapy of breast cancer. The absorbed dose was analyzed assuming left or right breast is source organ which is $^{103}Pd$ or $^{192}Ir$. As a result, $^{192}Ir$ dose is higher than $^{103}Pd$ in source organ and also in contralateral breast. Particularly, significant adjacent organs are lung, liver, heart and contralateral breast in brachytherapy of breast cancer.

Preparation, Characterization, and Catalytic Applications of Graphene-palladium Nanocomposites

  • Hong, Yeong-Guk;Yu, Se-Hui;Park, Jun-Beom
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.262-262
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    • 2012
  • Modifications of graphenes have been studied for catalytic applications due to their advantages such as high surface area, conductivity and thermal stability. In this research, individual graphene oxide (GO) sheets were exfoliated from graphite using Hummers and Offeman method. Pd nano-particles were deposited on the GO surface using Pd2+ ion exchange where hydroxyl groups on the GO act as nucleation sites of Pd nanoparticles and their dispersions. The thermal treatments of the Pd-GO in H2 flow produced Pd-Graphene nanocomposites. Their catalytic performances in Sonogashira reaction were investigated. Morphological and chemical structures of the GO, Pd-GO, and Pd-Graphene were investigated using FT-IR, XRD, TEM, STEM, and XPS. The catalytic performances have been investigated using microwave reactor.

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Comparison of the Characteristics of Pd-Ir-Y Ternary Alloy Catalyst Particles and Oxygen Reduction Activity According to Yttrium Contents (이트륨 함량에 따른 Pd-Ir-Y 3원계 합금 촉매 입자의 특성과 산소 환원 반응의 활성 비교)

  • KIM, DO HYUNG;LEE, EUNAE;PAK, CHANHO
    • Transactions of the Korean hydrogen and new energy society
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    • v.29 no.3
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    • pp.260-266
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    • 2018
  • To enhance catalyst activity of the palladium (Pd) towards oxygen reduction reaction (ORR), iridium (Ir) and yttrium (Y) were alloyed by polyol method. Due to the low reduction potential of Y, it is hard to reduce Y ion completely by polyol method. In XPS spectra, the binding energy of the Pd is shifted to a lower value, which indicates the d-electron of Pd is filled by the electron from the Y. And other phases of Y are observed by the XPS. Among the catalysts, the $Pd_4IrY_{0.1}/C$ showed the best activity towards ORR, which indicates the metallic Y is effective for improving the catalytic activity. Thus, for further enhancing ORR activity, the novel method for complete reduction of Y is needed.

Preparation and Characterization of Dinuclear and Trinuclear Metal Complexes, $[(PPh_3)_2(CO)M({\mu}-E)M(CO)(PPh_3)_2]X_2$ (M=Rh, Ir; E=Pyrazine, 4,4'-Bipyridyl, $X=SO_3CF_3$; $E=Pd(CN)_4$, $Pt(CN)_4$, X=none)

  • Ko Jaejung;Lee Myunggab;Kim Moonsik;Kang Sang Ook
    • Bulletin of the Korean Chemical Society
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    • v.13 no.2
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    • pp.158-162
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    • 1992
  • Hydrocarbon solution of $(PPh_3)_2(CO)MOSO_2CF_3(M=Rh$, Ir)reacts rapidly with Pyrazine or 4,4'-bipyridyl to yield dinuclear metal complexes $[(PPh_3)_3(CO)M({\mu}-pyrazine)M(CO)(PPh_3)_2](SO_3CF_3)_2$ (I: M= RhH; III: M=Ir) or [$(PPh_3)_2$(CO)M(${\mu}$-44'-bipyridyl)M(CO)$(PPh_3)_2](SO_3CF_3)_2$, (II: M=Rh; IV: M=Ir), respectively. Compounds, I, II, III, and IV were characterized by $^1H-NMR$, $^{13}C-NMR$, $^{31}P-NMR$, and infrared spectrum. Ethanol solution of $(PPh_3)_2(CO)MOSO_2CF_3$ (M=Rh, Ir) also reacts with $(TBA)_2$M'$(CN)_4$ (M'=Pd, Pt) to yield trinuclear metal complexes [$(PPh_3)_2$(CO)dM-NCM'$(CN)_2$CN-M(CO)$(PPh_3)_2]$ (V : M=Rh, M'=Pd; VI : M=Rh, M'=Pt; VII: M=Ir, M'=Pd; VIII: M=Ir, M'=Pt). The trinuclear metal complexes V, VI, VII, and VIII are bridged by the cyanide groups. The infrared spectrum of V, VI, VII, and VIII supports the presence of the bridged cyanide and terminal cyanide group.

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A Case of Aggravation of Thyroid Goiter after Treatment with PD-1 Inhibitor for Breast Cancer in Patients with Underlying Hashimoto's Thyroiditis (기저 하시모토 갑상선염이 있던 유방암 환자에서 PD-1 억제제 투약 후 악화된 갑상선 종대의 증례)

  • Kim, Hana;Kim, Min Joo;Song, Young Shin;Cho, Sun Wook
    • International journal of thyroidology
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    • v.11 no.2
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    • pp.172-175
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    • 2018
  • Anti-programmed cell death-1 (PD-1) humanized monoclonal antibody inhibits PD-1 activity by binding to the PD-1 receptor on T-cells and blocking PD-1 ligands and induces immune tolerance of cancer cells. It has been widely used for various kinds of cancer treatment. However, many immune-related adverse events (irAEs) have been reported because it modulates our immune system. In this case study, we reported a case of 42-year-old woman with Hashimoto's thyroiditis who showed rapid aggravation of thyroid goiter and acute hyperventilation syndrome after treatment with PD-1 inhibitor as a neoadjuvant chemotherapy for breast cancer.

Solvent Extraction for the Separation of Pd(II), Pt(IV), Ir(IV) and Rh(III) from 3 M Hydrochloric Acid Solution (3 M의 염산용액에서 팔라듐(II), 백금(IV), 이리듐(IV) 및 로듐(III)의 분리를 위한 용매추출)

  • Nguyen, Thi Hong;Lee, Man Seung
    • Resources Recycling
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    • v.26 no.3
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    • pp.26-31
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    • 2017
  • LIX 63 showed a selectivity for the extraction of Pd(II) over other PGMs, such as Pt(IV), Ir(IV) and Rh(III) from 6 M HCl solution. Moreover, HCl solution has significant effect on the oxidation-reduction reaction between Ir(IV) and LIX 63. Therefore, the applicability of employing LIX 63 for the separation of the 4 PGMs was investigated from 3 M HCl solution. From 3 M HCl solution, only Pd(II) was selectively extracted by LIX 63 and its extraction percentage was higher than from 6 M HCl solution. Extraction of the Pd(II) free raffinate with TBP led to the selective extraction of Pt(IV). After oxidation of Ir(III) with $NaClO_3$ to Ir(IV), extraction of the Pt(IV) free raffinate with Aliquat 336 selectively extracted Ir(IV). For each extraction step, optimum stripping conditions were obtained. By this process, it was possible to separate the 4 PGMs by solvent extraction from 3 M HCl solution.

The Study of Toluene Combustion over Palladium-copper/USY Zeolite Catalyst (Pd-Cu/USY 제올라이트상에서 톨루엔 연소반응 연구)

  • Lee, Hye Young;Jin, Taihuan;Hwang, Young Kyu;Chang, Jong-San;Hwang, Jin-Soo;Lee, Chang-Gook;Baek, Shin;Ra, Do-Young
    • Korean Chemical Engineering Research
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    • v.44 no.4
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    • pp.404-409
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    • 2006
  • The catalytic combustion of toluene over Pd-Cu/USY zeolite has been examined by using FT-IR spectroscopy in a closed system under dry and humid conditions. The catalytic combustion of toluene (700 ppmv) in the temperature range of $80-220^{\circ}C$ has been investigated by using a fixed bed reactor. The Pd-Cu/USY catalyst showed the highest catalytic performance with respects to the PdO-CuO/USY and Pd/USY. Comparing to $PdO/Al_2O_3$ catalysts, the slight improvement in conversion was observed over PdO/USY catalysts under humid condition since USY zeolite is hydrophobic substrate and water give an additional oxygen source to zeolite surface like oxygen. The reduced catalysts showed more enhanced catalytic activity due to the reduced activation energy of combustion of toluene than oxidized catalysts such as PdO/USY and PdO-CuO/USY.

Synthesis and Structure of trans-Dichlorobis(diisopropylaniline) palladium(II), trans-$[Pd(NH_2-C_6H_3-2, 6-i-Pr_2)_2Cl_2]$ (trans-Dichlorobis(diisopropylaniline) palladium(II), trans-$[Pd(NH_2-C_6H_3-2, 6-i-Pr_2)_2Cl_2]$의 합성 및 구조)

  • Hye Jin Kim;Won Seok Han;Soon Won Lee
    • Korean Journal of Crystallography
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    • v.12 no.3
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    • pp.137-140
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    • 2001
  • Compound PdCl₂(Phc≡N)₂(1) reacted with 2,6-diisopropylaniline to give trans-[Pd(NH₂-C/sub 6/-H₃-2, 6-i-Pr₂)₂Cl₂] (2). Compound 2 was characterized by spectroscopy (¹H-NMR, /sup 13/C-NMR, and IR) and X-ray diffraction. Crystallographic data for 2: monoclinic space group P2₁/n, a=13.532(3) Å, b=5.749(1) Å, c=17.880(4)Å, β=103.84(2)°, Z=2, R(wR₂)=0.0466(0.1226).

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