5Pascale DuPont, Jacques C. Heteropolyacids supported on activated carbon as catalysts for the esterification of acrylic acid by butanol [J]. Applied Catalysis A: General 129 (1995),217-227.
6Zhang Lixia, Jin Qingzhe. Ha PW12 040 immobilized on silylated palygorskite and catalytic activity in esterification re actions[J]. Applied Clay Science, 2010,47,229-234.
7Parida K M, Sujata Mallick. Silicotungstic acid supported zirconia:An effective catalyst for esterification reaction[J]. Journal of Molecular Catalysis A: Chemical, 2007 (275) : 77-83.
8Kozhevnikov I V. Sustainable heterogeneous acid catalysis by heteropoly acids[J]. Journal of Molecular Catalysis A: Chemical,2007 (262) :86-92.
