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本文在280℃和临氢总压为1.961M Pa的反应条件下,考察了正戊烷在氢型丝光沸石和0.5(重)%钯/氢型丝光沸石上异构化反应的活性和选择性,并以钯啶作探针,用脉冲色谱法和红外光谱法测定了催化剂的酸量及酸位性质。结果表明,氢型丝光沸石上存在着催化正戊烷异构化和裂化反应的两种活性中心,该沸石孔道内部脱铝位附近的强酸中心可能是正戊烷的裂化反应活性位,钯的引进将优先定位于这一强酸中心附近,因而去除了裂化反应源,改善了正戊烷异构化反应的选择性。
In this paper, the activity and selectivity of n-pentane in the isomerization of hydrogen mordenite and 0.5 wt% palladium / hydrogen mordenite were investigated under the reaction conditions of 280 ℃ and total hydrogen pressure of 1.961M Pa. , And using palladium as a probe, the acidity and acid sites of the catalyst were determined by pulse chromatography and infrared spectroscopy. The results show that there are two kinds of active sites on the hydrogenous mordenite that catalyze the isomerization and cracking of n-pentane. The strong acid sites near the dealumination sites of the zeolite may be the active site of n-pentane cracking. The introduction of palladium Will be preferentially located near this strong acid center, thus removing the source of cracking reaction and improving the selectivity of the n-pentane isomerization reaction.