催化剂薄层内甲烷水蒸气重整反应强化管内对流换热的数值模拟

本文以竖直圆管内壁催化剂薄层内发生甲烷水蒸气重整反应强化对流换热作为研究对象,对其进行了数值模拟．结果发现,催化剂薄层内的吸热化学反应可以有效地强化对流换热,降低流体和壁面温度,从而对壁面起到保护作用;极限热流密度的大小与流体的入口温度有关,存在最佳入口温度使极限热流密度最大．

甲醇制烯烃催化剂薄层成型技术研究

在实验室规模的喷动流化床干燥器中,利用喷雾造粒技术对甲醇制烯烃催化剂进行了薄层成型实验研究,分析了料液浓度、料液流量、床层温度、喷嘴高度和过剩气体速度对催化剂薄层成型的影响,并对薄层催化剂进行了评价。实验结果表明,分层生长制备出的薄层催化剂,与原有催化剂相比,具有较好的催化性能和良好的流动性。

流化床喷雾造粒制备MTO薄层催化剂实验研究

根据甲醇制烯烃流化床反应-再生工艺对催化剂反应性能、球形度、耐磨强度等的要求,利用流化床喷雾造粒法制备了MTO薄层催化剂。实验研究了进料流率、分子筛组合物与粘结剂质量比、分子筛组合物浓度对薄层生长速率的影响并比较了分别以分子筛和成型催化剂为原料造粒时的薄层生长速率。实验结果表明,当分子筛组合物浓度高、进料流率大时,催化剂涂层生长速率快,表面活性成分负载量大。

Biodiesel synthesis via metal oxides and metal chlorides catalysis from marine alga Melanothamnus afaqhusainii

This research article demonstrates the most comprehensive comparative catalytic study of different metal oxides and metal chlorides towards the methanolysis of triglycerides of marine red macroalga Melanothamnus alhqhusainii. CaO was found to be the most reactive metal oxide that yielded 80% biodiesel while ZnCI2 was the most reactive metal chloride that produced 60% biodiesel by mechanical stirring for 6 h at 100-110 ℃. The overall reactivity order of the catalysts was found to be CaO 〉 MgO 〉 Pb02 〉 ZnC12 〉 TIC14 〉 PbO 〉 HgC12 〉 ZnO 〉 AIC13 〉 SnCI2 〉 TiO2 whereas, CaCI2, MgCI2, A1203, HgO, PbCI2, MnO2, MnC12, Fe203 and FeCI3 were found to be non-reactive for transesterification of triglycerides. In addition, a detailed study of the screening of mobile phases and spraying reagents was conducted which showed that petroleum ether ： chloroform ： toluene （7：2：1 ） is the best mobile phase, whereas iodine crystals/silica gel is the best visualizing agent for the thin layer chroma- tography （TLC） examination ofbiodiesel. Biodiesel production was confirmed by comparative TLC examination. It was further supported by the determination of fuel properties of biodiesel, which were found to be similar to the standard limits of American Society for Testing and Materials （ASTM）,