Ternary Composite of Biomass Porous Carbon/SnO₂/Pt: An Efficient Catalyst for Reduction of Aromatic Nitro Compounds

Abstract

Ternary composite of biomass porous carbon/SnO 2 /Pt was prepared by a facile two-step method consisting of the hydrothermal process and the impregnation-chemical reduction procedure. The SEM and TEM revealed that particles of SnO 2 deposited on the surface of porous carbon (PC) and formed an intermediate layer, which facilitated Pt nanoparticles (around 3-4 nm) to deposit uniformly and firmly on the surface. The ternary composite catalyst of Pt-SnO 2 /PC exhibited significantly enhanced performance during the catalytic reduction of 4-nitrophenol to 4-aminophenol, and the reaction could completely finished within 80 seconds at room temperature, which apparent rate constant (K a = 71 3 10 À 3 s À 1 ) was approximately 36 times higher than that of Pt/PC with the same Pt loading. The hybrid catalyst also presented a good stability and the catalytic activity could maintain above 90% even after eighth recycling of reaction. Due to its unique structure and high catalytic performance, ternary composite of Pt-SnO 2 /PC has great potential in catalysis applications.

Ag nanoparticles immobilized on new magnetic alginate halloysite as a recoverable catalyst for reduction of nitroaromatics in aqueous media

“…This phenomenon also showed that this reaction followed pseudo-first-order kinetics. From the slope of this equation, the apparent rate constant (K) for the reduction of 4-nitrophenol was obtained of 0.047 s −1 41 , 42 .…”

Self-Assembled Magnetic Pt Nanocomposites for the Catalytic Reduction of Nitrophenol

“…The catalytic performance of Fe 3 O 4 @Pt NPs composites was initially tested by the model reaction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP), which was usually catalyzed by metal nanomaterials, − as shown in Figure a. Before the addition of Fe 3 O 4 @Pt NPs, the UV–vis spectrum of the mixture aqueous solution of 4-NP and NaBH 4 showed a strong absorption peak at 400 nm, which was attributed to the formation of 4-nitrophenolate anions.…”

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