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Selectively Catalytic Hydrogenation of Nitrile-Butadiene Rubber Using Grubbs II Catalyst
Chunjin Ai,Guangbi Gong,Xutao Zhao,Peng Liu 한국고분자학회 2017 Macromolecular Research Vol.25 No.5
Hydrogenated nitrile-butadiene rubber (H-NBR) is a high-performance elastomer with important applications in the automobile industry and petroleum field. Selectively catalytic hydrogenation of nitrile-butadiene rubber (NBR) with a typical olefin metathesis catalyst, Grubbs II, has been developed in the present work. The catalytic selectivity for the hydrogenation of -C=C- instead of -C≡N was supported by FT-IR and NMR analysis. The effects of the reaction conditions, such as reaction time, temperature, pressure, catalyst amount, and solvent, on the hydrogenation degree (HD) and relative molecular weight and distribution of the hydrogenated products have been investigated in detail. Under the optimized condition, 6 mg catalyst per 1.0 g NBR in 100 mL toluene solution and H2 pressure of 5.0 MPa at 55 °C for 3 h, a hydrogenation degree of 75% was obtained. In the case, the degradation of polymer chains might provide a solution for the challenge of high Mooney viscosity of H-NBR, strongly restricting its processability in many applications.
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Zhonghao Jin,Dao Li,Rui Ma,Xutao Peng,Guanzhong Lu,Xingyi Wang 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.3
2-Chloro-4,6-dinitroresorcinol was converted catalytically in one-pot operation to the corresponding Nalkyl secondary aminophenol, 4,6-bis(isopropylamino)resorcinol, in high yield by using acetone as alkyl source and hydrogen as reducing reagent over 10 wt.% Pd/C catalyst. The effects of reaction conditions, such as the amount of acetic acid, concentration of acetone, catalyst amount, and reaction time on the selectivity of 4,6-bis(isopropylamino)resorcinol were investigated.
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Xu, Tao,Yuan, Rui,Xu, Peng-Cheng,Pan, Dong-Jie,Yang, Woochul,Guo, Hai-Bo,Shen, Yu-Fang,Hu, Jian-Feng,Zhang, Zhi-Jun,Zhao, Jing-Tai Elsevier 2018 Journal of alloys and compounds Vol.762 No.-
<P><B>Abstract</B></P> <P>Uniform, monodisperse yttrium aluminum garnet (YAG) rhombic dodecahedron micro-crystals were synthesized using coprecipitation and hydrothermal methods. The Na<SUB>2</SUB>SO<SUB>4</SUB> as a surfactant was helpful in improving the dispersity of the crystallites and forming well-faceted, micro-sized dodecahedral YAG crystallites. The effect of the reaction time and the solvent has also been studied. The crystal growth mechanism called dissolution/crystallization was determined by analyzing the experimental and simulated results. And the specific well-developed crystal facets in the {110} family have been demonstrated by the theoretical calculation. A higher integrated emission intensity can be achieved for the YAG:Ce crystallites by improving the phase purity, morphology with better developed dodecahedrons, and dispersion. Furthermore, a rather high luminous efficacy (LE = 104.14 lm/W) for the white LED fabricated using the YAG:Ce<SUP>3+</SUP> phosphor prepared in this work was realized. The correlation between the crystal growth, morphology and luminescence properties of YAG crystallites has been established, which exhibits a great importance for the synthesis and application of mono-dispersed YAG crystallites.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Uniform and monodisperse YAG rhombic dodecahedron micro-crystals were synthesized. </LI> <LI> The growth mechanism of YAG rhombic dodecahedron was studied through experimental and computational simulation. </LI> <LI> The correlation between the crystal growth, morphology and luminescence of YAG crystallites was established. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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