Mesoporous Silica Materials with an Extremely High Content of Organic Sulfonic Groups and Their Comparable Activities with that of Concentrated Sulfuric Acid in Catalytic Esterification Ye-Fei Feng, Xiao-Yu Yang, Yan Di, Yun-Chen Du, Yong-Lai Zhang, and Feng-Shou Xiao
J. Phys. Chem. B, 2006, 110 (29), pp 14142–14147
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http://dx.doi.org/10.1021/jp061839p
