固体核磁共振技术研究金属氧化物类固体酸催化剂的酸碱性
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陈欣,付颖懿,岳斌,贺鹤勇
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Acidity and Basicity of Solid Acid Catalysts Studied by Solid-State NMR
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Xin CHEN,Ying-yi FU,Bin YUE,He-yong HE
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表1 吸附不同量水分子的铌氧化物和钽氧化物的酸性数据[40]
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Table 1 Acid density of niobium oxides and tantalum oxides with different amounts of adsorbed water[40]
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样品 | 吸附水量/ (μmol·g-1) | Brønsted酸密度/ (μmol·g-1) | Lewis酸密度/(μmol·g-1) | 总酸密度/ (μmol·g-1) | 强 | 弱 | 总量 | Nb2O5·nH2O | 0 | 251 | 340 | 549 | 889 | 1140 | | 50 | 278 | 309 | 574 | 883 | 1161 | | 100 | 291 | 300 | 584 | 884 | 1175 | | 150 | 303 | 291 | 595 | 886 | 1189 | Nb2O5-350 | 0 | 107 | 219 | 375 | 594 | 701 | | 50 | 143 | 186 | 409 | 595 | 738 | | 100 | 181 | 149 | 449 | 598 | 779 | | 150 | 182 | 129 | 469 | 598 | 780 | Nb2O5-450 | 0 | 52 | 107 | 236 | 343 | 395 | | 50 | 54 | 91 | 253 | 344 | 398 | | 100 | 57 | 78 | 268 | 346 | 403 | | 150 | 55 | 67 | 281 | 348 | 403 | Ta2O5·nH2O | 0 | 209 | 160 | 332 | 492 | 701 | | 50 | 219 | 148 | 345 | 493 | 712 | | 100 | 243 | 122 | 367 | 489 | 732 | | 150 | 251 | 110 | 375 | 485 | 736 | Ta2O5-350 | 0 | 89 | 123 | 273 | 396 | 485 | | 50 | 110 | 103 | 296 | 399 | 509 | | 100 | 135 | 80 | 316 | 396 | 531 | | 150 | 133 | 65 | 330 | 395 | 528 | Ta2O5-450 | 0 | 38 | 57 | 150 | 207 | 245 | | 50 | 37 | 42 | 168 | 210 | 247 | | 100 | 39 | 30 | 178 | 208 | 246 | | 150 | 36 | 24 | 185 | 209 | 248 |
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