Hydro-purification of crude terephthalic acid using palladium catalyst supported on multi-wall carbon nanotubes

Tourani, S ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jiec.2015.02.015
  3. Abstract:
  4. Palladium catalysts supported on functionalized multi-wall carbon nanotubes were synthesized for hydro-purification of crude terephthalic acid containing 2100ppm 4-carboxybenzaldehyde (4-CBA) as impurity. PdCl2 and Pd(OAc)2 were used as precursors. Palladium loadings were 0.05 to 0.6wt.% with catalysts reduced at 200 to 400°C. Catalysts prepared from both precursors with least 0.3wt.% palladium resulted in 99%+ removal of 4-CBA. The most desired selectivity was obtained for the catalyst with PdCl2 as precursor, reduction temperature of 300°C, and palladium loading of 0.3wt.%. This catalyst had slightly better performance than the commercial catalyst (0.5wt.% of palladium on activated carbon)
  5. Keywords:
  6. Crude terephthalic acid ; Hydro-purification ; Palladium catalyst, Carbon nanotubes ; Activated carbon ; Carbon ; Catalyst selectivity ; Catalysts ; Loading ; Multiwalled carbon nanotubes (MWCN) ; Purification ; Yarn ; 4-carboxybenzaldehyde (4-CBA) ; Better performance ; Commercial catalyst ; Palladium catalyst ; Palladium loading ; Reduction temperatures ; Terephthalic acids ; Catalyst supports
  7. Source: Journal of Industrial and Engineering Chemistry ; 2015 ; ISSN: 1226086X
  8. URL: http://www.sciencedirect.com/science/article/pii/S1226086X15000659