Nanosized CuO and ZnO Catalyst Supported on Honeycomb-Typed Monolith for Hydrogenation of Carbon Dioxide to Methyl Alcohol.

The greenhouse effect of carbon dioxide (CO2) has been recognized as one of the most serious problems in the world. Conversion of CO2 to methyl alcohol (CH3OH) was studied using catalytic chemical methods. Honeycomb-typed monolith used as catalyst support was 400 cell/inch2. Pretreatment of the monolith surface was carried out by thermal treatment and acid treatment. Monolith-supported nanosized CuO-ZnO catalysts were prepared by wash-coat method. The prepared catalysts were characterized by using SEM, TEM, and XRD. The catalytic activity for CO2 hydrogenation to CH3OH was investigated using a flow-type reactor with varying reaction temperature, reaction pressure and contact time. Conversion of CO2 was increased with increasing reaction temperature, but selectivity to CH3OH was decreased. Optimum reaction temperature was about 250 degrees C under 20 atm. Because of the reverse water gas shift reaction.

Synthesis and characterization of platinum(II) complexes containing spiro system.

Platinum complexes [Pt(bpy)Cl2](bpy: 2,2'-bipyridine) and [Pt(PT)Cl2](PT: 1,10-phenantroline) were reacted with 5,5"-(9,9-dioctyl-9H-fluorene-2,7-diyl)bis(2,2'-bipyrine), bpy-spiro-bpy, to afford mono and diplatinium complexes: [(bpy)Pt(bpy-spiro-bpy)][PF6]2, [(bpy)Pt(bpy-spiro-bpy)Pt(bpy)])[PF6]4, and [(PT)Pt(bpy-spiro-bpy)])][PF6]2, which were characterized by NMR, UV/VIS, mass spectrum, and PL spectroscopy. They showed very high internal quantum yields (0.35-0.67) and emitted light in the blue region (473-520 nm). Herein, we describe the synthesis, characterization of the mono- and di-platinum complexes in detail.

Synthesis and properties of the diruthenium(II) complexes with diimine-linked polypyridine bridges.

The diruthenium complexes, [(bpy)2Ru(II)-(bpy-DPDA)-Ru(II)(bpy)2][PF6]4 3, (bpy: 2,2'-bipyridiyl; bpy-DPDA: Bis(2,2'-dipyridylketenylidene)-N,N-1,4-phenylenediamine}, and [(bpy)2Ru(II)-(Dbpy-DPDA)-Ru(II)(bpy)2][PF6]4 4 {Dbpy-DPDA: Bis(2,2'-dipyridyl ketenylidene)-N,N-1,1'-(4,4'-diphenylene)diamine}, were prepared by the reaction of (bpy)2Ru(II)Cl2 with diimine-linked polypyridine bridges. These complexes were characterized by NMR, IR, UV/VIS, PL and cyclic voltammetry. In the 13C-NMR spectra of 3 and 4, the carbon peaks of the Schiff Bases (>C=N-) were shifted to lower fields, and emissions were observed at 689 and 693 nm with quantum yields of 0.004 and 0.006, respectively. The electrochemistry of complexes 3 and 4 showed four-reversible waves (one oxidation wave and three reduction waves). The electrochemically measured band gaps for complexes 3 and 4 were 2.01 and 2.10 eV, respectively.