【作者】 张旭； 杜涛；

【Author】 Xu Zhang;Tao Du;State Environmental Protection Key Laboratory of Eco-Industry, Metallurgy College, Northeastern University;Simulation Center, Shenyang Institute of Engineering;

【机构】 国家环境保护工业生态学重点实验室东北大学冶金学院； 仿真中心沈阳工程学院；

【摘要】 本文以不同的粉煤灰为原料进行了粉煤灰活化的优化分析,通过比较粉煤灰的碱溶水热活化和碱熔融活化以及选用不同的活化参数,确定了最佳的粉煤灰活化方案,提高了粉煤灰的利用率。最佳的粉煤灰活化方案为650℃的粉煤灰碱熔融活化,使用该方案合成单位质量的Al-MCM-41所需的能耗最少,并且该方案具有广泛的通用性。利用粉煤灰活化所得的上清液合成了Al-MCM-41,通过SXRD、氮气等温吸脱附、FTIR、TEM和27Al MAS NMR等表征技术对所得粉煤灰基Al-MCM-41进行了分析。结果表明该Al-MCM-41具有高度有序的二维六方介孔结构,MCM-41典型的结构参数,且绝大部分的铝离子都进入到了MCM-41的硅基骨架内,都以四配位的形式存在。更多还原

【Abstract】 This paper has a systematic optimization analysis of the strategies activating different coal fly ashes. By comparing alkaline hydrothermal and alkaline fusion treatments and altering activation parameters, we determine the optimal CFA activation condition and then improve the utilization rate of CFA. The optimal CFA activation condition is the alkaline fusion treatment at 650 ℃, which needs the lowest energy consumption per mass of Al-MCM-41 produced and has extensive versatility.Then, we use the CFA-derived supernatants to synthesize Al-MCM-41 and characterize it using the techniques such as SXRD,N₂ isotherms, FTIR, TEM, and 7 Al MAS NMR. Results show that the CFA-derived Al-MCM-41 has a highly-ordered twodimensional hexagonal mesoporous structure and typical MCM-41 pore-structure parameters. Moreover, most of the alumina ions are incorporated into the silica-based skeleton of MCM-41 in the form of tetrahedral form.更多还原