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OALib Journal期刊
ISSN: 2333-9721
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浸没式双管式陶瓷膜反应器用于ts-1催化苯酚羟基化的稳定性
, PP. 16-21
Keywords: 双管式膜反应器,ts-1分子筛,苯酚羟基化,苯二酚
Abstract:
在浸没式双管式陶瓷膜反应器中考察ts-1分子筛上h2o2氧化苯酚羟基化制苯二酚连续反应的稳定性。研究发现,30h连续反应过程中,苯二酚选择性保持不变,苯酚转化率逐渐下降。采用场发射扫描电子显微镜结合元素组分分析的测试方法分析使用后的陶瓷膜上的污染物,发现陶瓷膜上吸附少量ts-1催化剂,说明催化剂吸附是造成转化率下降的原因之一。采用x线衍射、紫外可见反射光谱、傅里叶变换红外光谱、n2吸附-脱附以及热分析等测试方法分析反应前后的ts-1催化剂性质,结果表明:经过30h的连续反应,ts-1分子筛的结晶度、mfi骨架结构和骨架中的钛含量没有显著变化,而其比表面积和孔体积显著降低,说明连续运行过程中产生的有机副产物沉积堵塞分子筛孔道造成ts-1催化剂失活,是导致反应转化率下降的主要原因。
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