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Kim, Il-Kwang,Somorjai, Gabor A,Kim, Youn-Geun Korean Chemical Society 1991 Bulletin of the Korean Chemical Society Vol.12 No.1
The preparation and characterization of semiconductive electrodes of MgO doped $Fe_2O_3$ were investigated. Pellets of MgO doped $Fe_2O_3$ were sintered at high temperatures between 1300$^{\circ}$C and 1400$^{\circ}$C and quenched rapidly in distilled water. The surfaces were analyzed by X-ray diffraction and scanning Auger electron spectroscopy. The surfaces of pellets contained both corundum structure ($Fe_2O_3$) and spinel structure ($Mg_xFe_{3-x}O_4$). Electrodes made of this material gave comparable anodic and cathodic photocurrents under illumination. The cathodic and anodic photocurrent on these photoelectrodes were verified high at 5-10 wt. percent that is critical doping amounts.
Preparation and Reaction Studies of Pt / Al₂O₃ Model Catalysts
Changmin Kim,Gabor A. Somorjai 한국진공학회(ASCT) 1994 Applied Science and Convergence Technology Vol.3 No.4
알루미늄 박편 위에 Pt/Al₂O₃ 모델 촉매를 만들었다. 알루미늄 표면을 10^(-5)Torr의 산소 압력 하에서 산화시킨 후, plasma evaporation source를 사용하여 Pt을 증착시켰다. 이 모델 촉매 표면에서 얼어나는 1-butene의 반응을 연구하였다. 산화알루미늄 표면에서는 이성질화 반응이 일어났으나, Pt을 증착시킨 산화알루미늄 표면에서는 수소첨가반응이 일어남이 관찰되었다. 알루미나 표면의 Pt이 증가함에 따라 수소첨가반응으로의 선택성이 증가되었다. Surface of Pt/Al₂O₃ model catalyst was produced on an aluminum foil with surface area of 1 ㎠. The aluminum surface was oxidized under 10^(-5) Torr oxygen and platinum was deposited on top of the oxide layer using a plasma evaporation source. Conversion of 1-butene was performed on the model catalyst surface. Isomerization was the major reaction in 1-butene conversion on the aluminum oxide layer. Addition of Pt on the aluminum oxide layer induces hydrogenation of 1-butene. Selectivity for the hydrogenation increases as the amount of Pt on alumina increases.
Kim, Il Kwang,Gabor A. Somorjai,Kim, Youn Geun 원광대학교기초자연과학연구소 1992 基礎科學硏究誌 Vol.11 No.3
The preparation and characterization of semiconductive electndes of MgO doped Fe₂O₃ were investigated. Pellets of MgO doped Fe₂O₃ were sintered at high temperatures between 1300℃ and 1400℃ and quenched rapidly in distilled water. The surfaces were analyzed by X-ray diffraction and scanning Auger electron spectroscopy. The surfaces of pellets contained both corundum structure(Fe₂O₃) and spinel structure(Mg, Fe₂, O₄). Electrodes made of this material gave comparable anodic and cathodic photocurrents under illumination. The cathodic and anodic photocurrent on these photoelectrodes were verified high at 5-10 wt. percent that is critical doping amounts.
Photochemical Hydrogen Production from a Water-Methanol Mixture with Iron Oxide Suspensions
Kim, I.K.,Salmeron, M.,Hendewerk, M.,Somorjai, G.A. 圓光大學校 基礎自然科學硏究所 1986 基礎科學硏究誌 Vol.5 No.2
Photochemical hydrogen production has been detected from small particles of doped iron oxide suspended in a methanol-water(1:1) mixture. The systems studied consisted of a pure n-type semiconductor, Fe_(2-x)Nb_XO_3 (x=0.02); a pure p-type semiconductor, La_(1-X)Sr_XFeO_3 (x=0.25), and Mg-doped α-Fe_2O_3. The efficiency of the reaction increased substantially when the powders were loaded with Pt. Of the systems investigated Mg-doped α-Fe_2O_3 showed the highest efficiency. In the case of Mg-doped α-Fe_2O-3 the existence of spinel phase inclusions in the α-Fe_2O_3 corundum structure remarkably enhances the photocatalytic reactivity, which may be a result of a cathodic shift of the conduction band edge of the corundum structure and also an increase in the conductivity of the material material. Hydrogen production from these Mg-doped iron oxides is photocatalytic and occurs mainly as a result of bandgap irradiation, but also occurs with sub-bandgap illumination. There is a linearly increasing dependence of the H_2 production with increasing light intensity.
Choi, Kyung Min,Na, Kyungsu,Somorjai, Gabor A.,Yaghi, Omar M. American Chemical Society 2015 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.137 No.24
<P>Chemical environment control of the metal nanoparticles (NPs) embedded in nanocrystalline metal–organic frameworks (nMOFs) is useful in controlling the activity and selectivity of catalytic reactions. In this report, organic linkers with two functional groups, sulfonic acid (−SO<SUB>3</SUB>H, S) and ammonium (−NH<SUB>3</SUB><SUP>+</SUP>, N), are chosen as strong and weak acidic functionalities, respectively, and then incorporated into a MOF [Zr<SUB>6</SUB>O<SUB>4</SUB>(OH)<SUB>4</SUB>(BDC)<SUB>6</SUB> (BDC = 1,4-benzenedicarboxylate), termed UiO-66] separately or together in the presence of 2.5 nm Pt NPs to build a series of Pt NPs-embedded in UiO-66 (Pt⊂nUiO-66). We find that these chemical functionalities play a critical role in product selectivity and activity in the gas-phase conversion of methylcyclopentane (MCP) to acyclic isomer, olefins, cyclohexane, and benzene. Pt⊂nUiO-66-S gives the highest selectivity to C<SUB>6</SUB>-cyclic products (62.4% and 28.6% for cyclohexane and benzene, respectively) without acyclic isomers products. Moreover, its catalytic activity was doubled relative to the nonfunctionalized Pt⊂nUiO-66. In contrast, Pt⊂nUiO-66-N decreases selectivity for C<SUB>6</SUB>-cyclic products to <50% while increases the acyclic isomer selectivity to 38.6%. Interestingly, the Pt⊂nUiO-66-SN containing both functional groups gave different product selectivity than their constituents; no cyclohexane was produced, while benzene was the dominant product with olefins and acyclic isomers as minor products. All Pt⊂nUiO-66 catalysts with different functionalities remain intact and maintain their crystal structure, morphology, and chemical functionalities without catalytic deactivation after reactions over 8 h.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2015/jacsat.2015.137.issue-24/jacs.5b03540/production/images/medium/ja-2015-035409_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja5b03540'>ACS Electronic Supporting Info</A></P>