期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 76, 期 1-3, 页码 51-60出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2004.08.001
关键词
heteropolyacid; 12-tungstophosphoric acid; SBA-15; diisopropylnaphthalene; isopropylation of naphthalene
12-Tungstophosphoric acid catalysts supported on mesoporous silica SBA-15 with various acid loadings were prepared by impregnation, and their physical chemical properties were characterized by XRD, N-2-adsorption, FTIR, DSC and NH3-TPD techniques. Their catalytic performances in the isopropylation of naphthalene with isopropanol were investigated in a batch reactor. It was found that 12-tungstophosphoric acid was highly dispersed on the SBA-15 support when the acid loading was as high as 60%, and meanwhile the Keggin structure of heteropolyanions could be retained. In addition, the thermal stability of the supported acid decreased by approximately 100 K as compared with the pure acid. In isopropylation of naphthalene, SBA-15 supported acid catalysts showed much higher conversion and selectivity to diisopropylnaphthalenes, beta-isopropylnaphthalene, and beta, beta-products than those of pure acid. Furthermore, the catalytic performances of SBA-15 supported catalysts were compared with those supported on other siliceous materials such as MCM-41 and amorphous silica, as well as zeolite catalysts such as USY, H-mordenite and dealuminated H-mordenites. The catalytic behavior has been discussed in relation with the physical chemical properties of catalysts. (C) 2004 Elsevier Inc. All rights reserved.
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