一种MCM-22分子筛催化剂的制备方法

带填

1butenemetathesisoveramoo3hmordenitealuminacatalyst

Metathesis reactions of 1-butene over a MoO3/H-mordenite-alumina (MoO3/HM-Al2O3) catalyst were investigated in a fixed-bed reactor. The catalysts were characterized by NH3 temperature-programmed desorption, X-ray diffraction, and H-2 temperature-programmed reduction. The results indicate that under the reaction conditions of 110 degrees C, 0.1 MPa, WHSV = 1.5 h(-1), and TOS = 1 h, MoO3 shows no isomerization and metathesis activities. Al2O3, HM-Al2O3, and HM supports only possess suitable isomerization activity controlled by the acidity of the samples, and the isomerization products increase with the acid strength. The yields of products are close to each other on the MoO3/Al2O3 catalyst with less metathesis activity. MoO3/HM-Al2O3 has the best reaction performance, on which 1-butene conversion, propene yield, and pentene yield are 84.9%, 28.5%, and 20.6%, respectively. The acidity of the catalyst and the oxidation state of Mo species are the two key factors for the catalyst performance for 1-butene metathesis

武汉东湖浮游植物群落结构的时空变化与环境因子的关系

研究了武汉东湖浮游植物群落结构的时空变化。东湖3个采样点的TN和TP含量存在显著差异。东湖Ⅰ、Ⅱ站浮游植物生物量的最高值出现在冬季和春季,Ⅲ站生物量的最高值则出现在夏季。相对于东湖较高的营养盐含量,其浮游植物生物量相对较低。这一方面是因为东湖较高密度的滤食性鲢鳙鱼的摄食作用抑制了浮游植物生物量的升高,另一方面是由于东湖较低的透明度使浮游植物的生长受到光照的限制。由于受到滤食性鱼类摄食、较高的营养水平以及较低的透明度的影响,东湖的浮游植物主要由隐藻、真蓝裸甲藻、小环藻和直链藻以及小型的绿球藻和蓝藻所组成

市政污泥的燃料资源化利用

参考垃圾衍生燃料的制备方法考察了市政污泥作为能源的可行性及利用价值,研究了污泥资源化利用前的最佳脱水干化条件及煤粉添加量对污泥燃烧效果的影响.结果表明,污泥热源干化的最佳时间为4h,干化后污泥的发热量在18MJ/kg左右,能量较高,且污泥的发热量随含水率和有机物含量变化而变化.当干化温度在105～150℃之间时,污泥的可燃有效成分几乎无变化.污泥含H量较高,燃烧时会有大量挥发分燃烧,这也是污泥燃点低于煤的原因