The Influence of the Acid Sites on the Methylamines Synthesis with Cu-HZSM-5 Zeolite

Polyaniline/SiO 2 nanocomposite material has been synthesized by using chemical oxidative method. Prepared catalytic material was characterized by means of transmission electron microscopy (TEM), thermal analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and Fourier transform infrared spectroscopy (FT-IR). Solvent stability for the catalyst has been screened using UV-Visible spectroscopy. Polyaniline/SiO 2 catalyzed route has found to be an efficient and rapid protocol for the synthesis of quinoxaline derivatives by cyclocondensation of 1,2-diketones and o-phenylenediamines at room temperature. This protocol has several advantages such as high yield, good thermal stability, simple work up procedure, non-toxic, clean, and easy recovery and reusability of the catalytic system. EXPERIMENTALAll Chemicals were purchased either from Merck or Fluka and used without further purification. Melting points were taken in an open capillary and are uncorrected. The morphology of catalyst was characterized with CM-200 PHILIPS transmission electron microscopy (TEM) oper-

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Copper-based Catalysts for Synthesis of Methylamines: The Effect of the Metal and the Role of the Support

Ribeiro

Henriques

Schmal

2005

Catal Lett

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Three Cu-based catalysts supported in different materials were prepared. The textural properties showed that the thermal treatment and the presence of CuO resulted in decrease of BET area. The surface areas of the Cu on alumina and zeolite decay with Cu addition, which can be attributed to the formation of CuO particles, blocking the pores. Contrary, the based like-hydrotalcite catalysts surface areas increased, which may be attributed to the destruction of the structure and formation of oxide mixtures. The acid sites with moderate strength favored the methylamines production, due to the easier desorption of products. The metallic sites affect the reaction since they provide a decrease in desorption temperature of the amines and enhance the disproportionation. The metallic sites in the based like-hydrotalcite catalysts Cu/Mg-Al enhance the formation of methylamines. The Cu/Al 2 O 3 was more active and stable than the other Cu based catalysts.

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The Influence of the Acid Sites on the Methylamines Synthesis with Cu-HZSM-5 Zeolite

Cited by 8 publications

References 19 publications

Methanol to Hydrocarbons

Methanol to Hydrocarbons

Polyaniline/SiO₂ Nanocomposite Catalyzed Efficient Synthesis of Quinoxaline Derivatives at Room Temperature

Copper-based Catalysts for Synthesis of Methylamines: The Effect of the Metal and the Role of the Support

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The Influence of the Acid Sites on the Methylamines Synthesis with Cu-HZSM-5 Zeolite

Cited by 8 publications

References 19 publications

Methanol to Hydrocarbons

Methanol to Hydrocarbons

Polyaniline/SiO2 Nanocomposite Catalyzed Efficient Synthesis of Quinoxaline Derivatives at Room Temperature

Copper-based Catalysts for Synthesis of Methylamines: The Effect of the Metal and the Role of the Support

Contact Info

Product

Resources

About

Polyaniline/SiO₂ Nanocomposite Catalyzed Efficient Synthesis of Quinoxaline Derivatives at Room Temperature