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CHEMICAL ENGINEERING JOURNAL · 2013 · IF 3.473

Selective hydrogenation of o-chloronitrobenzene over tin dioxide supported platinum–ruthenium bimetallic nanocatalysts without solvent

Manhong Liu,Qiang Bai,Hailian Xiao,Yanyan Liu,Jun Zhao,William W. Yu

Colloidal platinum–ruthenium bimetallic nanoparticles with 2.3 nm were synthesized in solution and then immobilized on tin dioxide powder to make a supported nanocatalyst (Pt–Ru/SnO 2 ). The immobilized bimetallic nanoparticles had the same size and size distribution as the solution dispersed ones. Selective hydrogenation of o -chloronitrobenzene to o -chloroaniline was performed over the as-prepared Pt–Ru/SnO 2 nanocatalyst without using any solvent; 99.5% selectivity to o -chloroaniline at ∼100% conversion was achieved.

研究领域: 催化化学 · 纳米材料 · 有机合成 · 绿色化学 · 应用化学

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JOURNAL OF APPLIED POLYMER SCIENCE · 2014 ·Vol. 132 ·期 7 · IF 1.64

Polycarbonate polyurethane elastomers synthesized via a solvent-free and nonisocyanate melt transesterification process

Pan Dongdong,Tian Hengshui

Soluble and thermally stable polycarbonate polyurethane elastomers were synthesized through a solvent-free and nonisocyanate melt transesterification process. The conditions of this process were studied, and the optimum conditions were as follows: the catalyst dibutyltin oxide dosage was 0.125 wt %, the raw material molar ( n ) ratio of dimethyl 1,6-hexamethylene dicarbamate (HDC) to poly(carbonate macrodiol) (PCDL) was n (HDC)/ n (PCDL) = 1:0.99, the reactants were prepolymerized under 100°C for 1 h and then under 185°C and a high vacuum for 4 h. Three different PCDLs were selected to participate in the reaction under the conditions mentioned previously, and their structures were characterized by Fourier transform infrared spectroscopy and X-ray diffraction. The products obtained from this process were still stable under 280°C. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41377.

研究领域: 高分子化学 · 生物材料 · 聚合物科学 · 材料化学 · 医用高分子

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RSC Advances · 2014 ·Vol. 4 ·期 52 ·27259-27266 · IF 3.708

Continuous heterogeneous cyclohexanone ammoximation reaction using a monolithic TS-1/cordierite catalyst

Libin Yang,Feng Xin,Junzhong Lin,Zhuang Zhuang,Rui Sun

In this study, a hydrothermal synthesis was developed to prepare a thin titanium silicalite-1 catalyst layer in the internal channels of the honeycomb cordierite support, which was used in a continuous heterogeneous reaction. The as-prepared thin TS-1 catalyst layer was characterized by SEM, XRD, UV-vis and ATR-FTIR methods. Multiple hydrothermal syntheses were used for controlling the crystalline growth to optimize catalytic activity and lifetime. Moreover, a monolithic TS-1/cordierite reactor with external looping was utilized to investigate the characteristics of the continuous heterogeneous ammoximation reaction without the organic solvent tert-butanol (TBA). The reaction results showed that the conversion of cyclohexanone and selectivity of oxime approached more than 0.96 and 0.98, respectively. When compared with the reaction using TBA as the reaction solvent, the activity of the monolithic TS-1/cordierite showed no differences except for a longer lifetime.

研究领域: 化学工程 · 催化化学 · 材料科学 · 工业化学 · 绿色化学

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Selective hydrogenation of o-chloronitrobenzene over tin dioxide supported platinum–ruthenium bimetallic nanocatalysts without solvent

Polycarbonate polyurethane elastomers synthesized via a solvent-free and nonisocyanate melt transesterification process

Continuous heterogeneous cyclohexanone ammoximation reaction using a monolithic TS-1/cordierite catalyst