Preparation and Formation Mechanism of New PdHx-Pd/C Catalyst through Hydrazine-reducing Method under Atmospheric Pressure and H2-free Conditions

doi:10.3724/SP.J.1077.2013.13011

Abstract

Abstract: PdH_x is an important reactive species for the Pd/C catalyst. Without H₂, it can not exist stably at room temperature. This species is usually prepared through reaction of Pd with H₂ under certain pressure. PdH_x-Pd/C catalyst was prepared through hydrazine-reducing method under atmospheric pressure and H₂-free conditions. The microstructure, morphology and chemical state of PdHx and Pd particles were investigated by XRD, TEM and XPS characterization methods. The formation mechanism of PdH_x particles in the hydrazine-reducing method was proposed. Experimental results show that the average particle size of PdH_x is 3.9 nm, and the d spacing of PdH_x(111) is slightly larger than that of Pd(111). The PdH_x particles derive from the reduction process of PdO by hydrazine. Their particle size is closely related to the particle size and structural imperfection of PdO. The PdH_x-Pd/C catalyst demonstrates better catalytic performance than the conventional Pd/C catalyst in the amination reaction to produce 2, 6-dimethylaniline under H₂-free condition.

Key words: Pd, activated carbon, characterization, PdH_x

CLC Number:

TQ174

HUAN Chang-Yong, MA Lei, L- De-Yi, ZHENG Yi-Fan, JI Lai-Jun, LI Xiao-Nian. Preparation and Formation Mechanism of New PdH_x-Pd/C Catalyst through Hydrazine-reducing Method under Atmospheric Pressure and H₂-free Conditions[J]. Journal of Inorganic Materials, 2013, 28(10): 1072-1078.

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Preparation and Formation Mechanism of New PdH_x-Pd/C Catalyst through Hydrazine-reducing Method under Atmospheric Pressure and H₂-free Conditions

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