TS-1/堇青石整体催化剂催化苯酚羟基化制苯二酚

以市售TS-1分子筛为活性组分,蜂窝状堇青石陶瓷为载体,硅溶胶(30%水溶液)为黏结剂,采用涂覆法制备TS-1/堇青石整体催化剂,并用于催化苯酚和过氧化氢(30%水溶液)的羟基化反应。在自制强制外循环间歇反应器中考察反应温度、反应时间、TS-1负载量和n(苯酚)∶n(过氧化氢)等对苯酚羟基化的影响。结果表明,添加硅溶胶后,牢固度有了很大提高。在以水为溶剂、n(苯酚)∶n(过氧化氢)=3∶1、m(H_2O)∶m(苯酚)=5∶1、m(苯酚)∶m(TS-1)=10∶1和60℃条件下反应6 h,苯酚转化率为28.3%,苯二酚选择性为93.2%。

TS-1/cordierite monolithic catalyst for hydroxylation of phenol to hydroquinone

Using commercially available TS-1 molecular sieve as the active component,cordierite ceramic honeycomb as the carrier and silica sol (30% aqueous solution) as a binder,TS-1/cordierite monolithic catalyst was prepared by coating method.The as-prepared catalyst was used to catalyze hydroxylation of phenol with hydrogen peroxide(30% aqueous solution).The effects of reaction temperatures,reaction time,TS-1 loading and molar ratios of phenol to hydrogen peroxide on hydroxylation of phenol were investigated in a homemade external circulation-forced batch reactor.The results showed that firmness was greatly improved after adding the silica sol.Under the condition of water as the solvent,n(phenol)∶n(H2O2)=3∶1,m(H2O)∶m(phenol)=5∶1,m(phenol)∶m(TS-1)=10∶1,reaction temperature 60 ℃ and reaction time 6 h,phenol conversion and the selectivity to hydroquinone reached 28.3% and 93.2%,respectively.