СИНТЕЗ, СТРУКТУРА И КАТАЛИТИЧЕСКИЕ СВОЙСТВА НАНОСТРУКТУРНЫХ Pd МАТЕРИАЛОВ В КАТАЛИТИЧЕСКОЙ ГИДРОГЕНАЦИИ п-НИТРОАНИЛИНА
Аннотация
The article is focused on development of palladium supported catalysts, investigation of their structure and catalytic properties and correlations of catalysts activity in hydrogenation of p-nitroaniline. A series of Pd supported catalysts were synthesized using Al2O3, SiO2 and activated carbon for Pd stabilization with active metal loading of 3, 4, 5 wt. %. Catalysts samples were synthesized using modified precipitation method, characterized by scanning electron microscopy, temperature programmed reduction, nitrogen physisorption, infrared spectroscopy and tested in p-nitroaniline catalytic hydrogenation process. The work shows efficient approach of functional materials obtainment in terms of catalysis application. Main advantages of such approach are cheapness and ease of implementation, which give the possibility to obtain functional materials right on the place of application. All chemicals used are of wide availability and no additional equipment is necessary. The Pd based catalysts supported on alumina, silica and activated carbon were tested in p-nitroaniline hydrogenation. Catalysts sample activity in p-nitroaniline hydrogenation process has strong correlation with metal dispersion and support acidity. The sample 5 wt.% Pd/γ-Al2O3 show the highest activity 4.6∙10-5 mol(H2)/s characterized by highest acidity and moderate metal dispersion. The comparison of the data of catalyst activity and the content of pores of various sizes showed the certain correlation. After the reaction of hydrogenation of 4-nitroaniline, the change in the pore sizes of the catalysts can provide indirect information about the supposed physical processes occurring on the surface of the catalyst. Strong correlation between catalyst structure and its activity in p-nitroaniline hydrogenation was found.
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