Synthesis of Pd/C Nanocatalyst for Hydropurification of Terephthalic Acid with Pd Nanocrystalline from Aqueous Colloidal Solution
With the assistance of CTAB-brij35-tween80 ternary surfactant, the Pd colloidal nanoparticles were synthesized by adding NaBH4 solution into palladium (Pd(II)) aqueous solution. In the reduction initial stage, particles were connected with each other by dendritic bonds, and after 1 h, most of the particles with the average size of 5.2 nm were well dispersed. The nanoparticles were then loaded onto the activated carbon carrier to prepare the 0.5% Pd/C catalysts for crude terephthalic acid (CTA) hydropurification. The catalytic activity of Pd/C which was mainly proportional to the particle size increased firstly and decreased subsequently with the increase of reductant dosage and Pd concentration. It decreased gradually with the increase of pH value and presented the opposite tendency with the reduction time. The conversion rate of 4-carboxy benzaldehyde nearly reached 100% under reaction temperature of 278 °C, H2 partial pressure of 0.5 MPa and reaction time of 1 h.
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Document Type: Short Communication
Publication date: September 1, 2017
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