Silver/graphene nanocomposites as catalysts for the reduction of p‐nitrophenol to p‐aminophenol: Materials preparation and reaction kinetics studies

Abstract

Ag/graphene nanocomposites have been demonstrated to be promising catalysts for hydrogenation reduction of p-nitrophenol (p-NP) to p-aminophenol (p-AP). Herein, we reported the synthesis of graphene-supported silver nanoparticles (Ag/G) using one-step and stabilizer-free process. The obtained Ag/G nanocomposites were demonstrated to be efficient catalysts for the reduction of p-NP to p-AP. The reaction kinetics of the catalytic reduction, including the effects of catalyst concentrations and temperatures are reported. These results are of significant values for the scale-up of using Ag/graphene catalysts for hydrogenation reduction.

Hierarchical 0D/2D Co3O4 hybrids rich in oxygen vacancies as catalysts towards styrene epoxidation reaction

“…Catalytic stability is one of the key parameters for the actual application of the catalysts [51,52]. The stability of the OV-Co3O4 was investigated for six repeated reactions under similar reaction conditions.…”

Experimental methods in chemical engineering: Ultraviolet visible spectroscopy—UV‐Vis

“…Chemical engineering applications include waste‐water treatment, dye degradation, characterizing colloidal nanoparticles—silver, gold, and copper—metallic coordination of molybdenum and cobalt, bimetallic mesoporous materials with cobalt and chromium, and composites of graphene oxide and silver nanoparticles …”

“…Engineers also characterize polymer impregnation, measure the size distribution of emulsions, release rates control of organic compounds, and encapsulation and release rates of antibiotics . UV‐vis spectroscopy is a powerful tool to calculate the reaction rates . Coupled with HPLC and mass spectrometry, it monitors several wavelengths concurrently .…”

Selective oxidation of o‐chlorotoluene to o‐chlorobenzaldehyde catalyzed by (Co,Mn)(Co,Mn)2O4 catalysts

“…In addition, the catalysts calcined at lower temperatures such as CM‐300, CM‐400, and CM‐500 have more uniform nanoparticles than those calcined at higher temperatures, such as CM‐600 and CM‐700. The average particle sizes obtained from the TEM images of the CM‐300, CM‐400, CM‐500, CM‐600, and CM‐700 samples are 10.8 nm, 18.5 nm, 20.8 nm, 38.7 nm, and 51.9 nm, respectively. These differences in particle size and crystallinity apparently will affect the activity and selectivity of the catalysts …”