Catalytic decomposition of 4-phenoxyphenol over Pd/XCs2.5H0.5PW12O40/ACA (activated carbon aerogel)-SO3H (X = 10–30 wt%) catalysts

Authors: Hai Woong Park, Jeong Kwon Kim, Ung Gi Hong, Yoon Jae Lee, Ji Hwan Song, In Kyu Song

Abstract:
Activated carbon aerogel (ACA) bearing sulfonic acid group (ACA-SO₃H) was prepared by a sulfonation of activated carbon aerogel, and subsequently, Cs_2.5H_0.5PW₁₂O₄₀ was impregnated on ACA-SO₃H to form XCs_2.5H_0.5PW₁₂O₄₀/ACA-SO3H with a variation of Cs_2.5H_0.5PW₁₂O₄₀ content (X = 10, 15, 20, 25, and 30 wt%). Palladium catalysts were then supported on XCs_2.5H_0.5PW₁₂O₄₀/ACA-SO₃H by an incipient wetness impregnation method. The prepared Pd/XCs_2.5H_0.5PW₁₂O₄₀/ACA-SO₃H catalysts were applied to the decomposition of 4-phenoxyphenol. 4-Phenoxyphenol was used as a lignin model compound for representing 4-O-5 linkage of lignin. Cyclohexanol, benzene, and phenol were mainly produced by the decomposition of 4-phenoxyphenol. Acidity of Pd/XCs_2.5H_0.5PW₁₂O₄₀/ACA-SO₃H catalysts played an important role in the decomposition of 4-phenoxyphenol. Conversion of 4-phenoxyphenol and total yield for main products (cyclohexanol, benzene, and phenol) increased with increasing acidity of Pd/XCs_2.5H_0.5PW₁₂O₄₀/ACA-SO₃H. Among the catalysts tested, Pd/15Cs_2.5H_0.5PW₁₂O₄₀/ACA-SO₃H with the largest acidity showed the highest conversion of 4-phenoxyphenol and total yield for main products. Conversion of 4-phenoxyphenol and total yield for main products over Pd/15Cs_2.5H_0.5PW₁₂O₄₀/ACA-SO₃H were much higher than those over palladium catalyst supported on activated carbon aerogel (Pd/ACA) and palladium catalyst supported on activated carbon aerogel bearing sulfonic acid group (Pd/ACA-SO₃H). Furthermore, Pd/15Cs_2.5H_0.5PW₁₂O₄₀/ACA-SO₃H catalyst was stable and reusable in the decomposition of 4-phenoxyphenol.

Keywords:
Heteropolyacid
Activated carbon aerogel bearing sulfonic group
Pd catalyst 4-Phenoxyphenol
Decomposition

Published in: Applied catalysis A: General  (Volume 453, Pages 1-402, 26 February 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Catalytic decomposition of 4-phenoxyphenol over Pd/XCs2.5H0.5PW12O40/ACA (activated carbon aerogel)-SO3H (X = 10–30 wt%) catalysts

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