Catalytic decomposition of 1,3-diphenoxybenzene to monomeric cyclic compounds over palladium catalysts supported on acidic activated carbon aerogels

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• 作者：Hai Woong Park ; Jeong Kwon Kim ; Ung Gi Hong ; Yoon Jae Lee ; Jung Ho Choi ; Yongju Bang ; In Kyu Song ; ^{inksong@snu.ac.kr}
• 关键词：Acidic activated carbon aerogel ; Heteropolyacid ; Pd catalyst ; Lignin decomposition ; 1 ; 3-Diphenoxybenzene
• 刊名：Applied Catalysis A: General
• 出版年：2013
• 出版时间：10 April, 2013
• 年：2013
• 卷：456
• 期：Complete
• 页码：59-66
• 全文大小：1220 K

文摘

Activated carbon aerogel (ACA) was prepared by a chemical activation of carbon aerogel using phosphoric acid (H₃PO₄). Activated carbon aerogel bearing sulfonic acid (ACA-SO₃H), Cs_2.5H_0.5PW₁₂O₄₀-impregnated activated carbon aerogel (Cs_2.5H_0.5PW₁₂O₄₀/ACA), and Cs_2.5H_0.5PW₁₂O₄₀-impregnated activated carbon aerogel bearing sulfonic acid (Cs_2.5H_0.5PW₁₂O₄₀/ACA-SO₃H) were prepared in order to provide acid sites to ACA. Palladium catalysts were then supported on ACA, ACA-SO₃H, Cs_2.5H_0.5PW₁₂O₄₀/ACA, and Cs_2.5H_0.5PW₁₂O₄₀/ACA-SO₃H by an incipient wetness impregnation method. The prepared Pd/ACA, Pd/ACA-SO₃H, Pd/Cs_2.5H_0.5PW₁₂O₄₀/ACA, and Pd/Cs_2.5H_0.5PW₁₂O₄₀/ACA-SO₃H catalysts were applied to the decomposition of 1,3-diphenoxybenzene. 1,3-Diphenoxybenzene was used as a trimeric lignin model compound for representing C-O bond in lignin. Cyclohexanol, benzene, and phenol were mainly produced by the decomposition of 1,3-diphenoxybenzene. 4-Phenoxyphenol was also produced as an intermediate by the decomposition of 1,3-diphenoxybenzene. Conversion of 1,3-diphenoxybenzene and total yield for main products (cyclohexanol, benzene, and phenol) increased with increasing acidity of the catalysts. Among the catalysts tested, Pd/Cs_2.5H_0.5PW₁₂O₄₀/ACA-SO₃H with the largest acidity showed the highest conversion of 1,3-diphenoxybenzene and total yield for main products. Pd/Cs_2.5H_0.5PW₁₂O₄₀/ACA-SO₃H also served as a stable and reusable catalyst in the decomposition of 1,3-diphenoxybenzene.