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考察了常温下 S2 O2 - 8 促进 Zr O2 ( PSZ)固体超强酸催化剂上正戊烷的反应性能 ,并与 SO2 - 4 促进 Zr O2( SZ)反应相比较 ,观察到 PSZ和 SZ对正戊烷都具有异构化和裂解的双重作用 ,主要产物分别为异戊烷和异丁烷 .正戊烷的异构化转化率和表观反应速率常数主要取决于样品的焙烧温度 .但对于正戊烷异构化反应 ,PSZ的最佳焙烧温度为 5 5 0℃ ,比 SZ的低 5 0℃ .在各自的最佳焙烧温度下反应 1 h后 ,前者的异戊烷生成率为后者的 1 .3倍 .通过 S含量和比表面积测定以及用 XRD和 FTIR等手段分析了 PSZ的物理化学特性 .从原位 FTIR谱图发现 ,PSZ( 5 5 0℃ )表面 S— O键的红外吸收明显比 SZ( 6 0 0℃ )的强 ;通过吡啶红外手段发现 PSZ( 5 5 0℃ )吡啶离子吸收峰的红移大于 SZ( 6 0 0℃ ) ,表明前者的 Lewis酸强于后者 .
The reaction performance of n - pentane on S2 O2 - 8 promoted Zr O2 (PSZ) solid superacid catalyst was investigated at room temperature. Compared with SO2 - 4 promoted Zr O2 (SZ) reaction, the effect of PSZ and SZ on n - Has the dual role of isomerization and cracking, the main products were isopentane and isobutane.N-pentane isomerization conversion rate and apparent reaction rate constant depends mainly on the sample calcination temperature.But for n-pentane Alkane isomerization reaction, the optimum calcination temperature of PSZ was 550 ℃, which was 50 ℃ lower than that of SZ.After the reaction at the optimum calcination temperature for 1 h, the yield of isopentane in the former was 1.3 times.The physical and chemical properties of PSZ were analyzed by S content and specific surface area and by XRD and FTIR.The in situ FTIR spectra showed that the infrared absorption of S-O bonds on PSZ (550 ℃) Was significantly higher than that of SZ (600 ℃). The red shift of the pyridine ion absorption peak at PSZ (550 ℃) was found to be greater than SZ (600 ℃) by pyridine infrared spectroscopy, indicating that Lewis acid of the former is stronger than the latter.