【摘要】 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。更多还原

【Abstract】 The activity and selectivity of n-pentane isomerization over H-mordenite and 0.5 wt% Pd/H-mordenite were studied at 280℃ under the total reaction pressure of 1.961 M Pa. The acidic properties of the catalysts were studied by neans of the IR technique and the pulse technique. The results showed that sites of two different locations were involved in the reactions of n-pentane on H-mordenite and the strong acid sites situated inside the channels of the dealuminated H-mordenite might be the active centres for catalyzing n-pentane cracking reaction. The presence of the exchanged Pd ions would first capture the position near the strong acid sites and eliminate the activity of the n-pentane cracking reaction centers; accordingly, the selectivity of n-pentane isomerization would be improved.更多还原