Synthesis of ZSM-5 zeolite from lignite fly ash and rice husk ash
Synthesis of ZSM-5 zeolite from lignite fly ash and rice husk ash
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DOI：
10.1016/j.fuproc.2003.10.026
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发表时间：
2004-10-15
影响因子：
7.5
通讯作者：
Limtrakul, J
中科院分区：
文献类型：
--
作者：
Chareonpanich, M;Namto, T;Limtrakul, J
以泰国Mae-Moh电厂的褐煤粉煤灰和虱壳灰为原料合成ZSM-5沸石。研究了影响粉煤灰合成ZSM-5沸石产率的因素，考察了SiO2/Al 2 O3摩尔比、四丙基溴化铵（TPABr）的存在、保温温度、保温时间和初始压力等因素对合成ZSM-5分子筛的影响。发现在SiO_2/Al_2O_3摩尔比为2.8-200的条件下，不使用TPABr，只能合成P型沸石。为了合成ZSM-5分子筛，加入硅酸钠溶液以调节原料灰中SiO2/Al 2 O3的摩尔比。ZSM-5分子筛的产率高达59 wt.%当SiO_2/Al_2O_3摩尔比为40、保温温度为210 ℃、保温时间为4 h、初始压力为4 bar时，可得到较好的催化效果。初步考察了ZSM-5分子筛对CO2加氢反应的催化性能，并与商品ZSM-5分子筛进行了比较。观察到这两种催化剂之间的催化性能没有显著差异。(C)2004 Elsevier B. V.保留所有权利。
The lignite fly ash from the Mae-Moh power plant, Thailand, and lice husk ash were used as raw materials for ZSM-5 zeolite synthesis. Factors affecting the yield of ZSM-5 zeolite synthesized from fly ash, i.e., the SiO2/Al2O3 mole ratio, the presence of tetrapropyl ammonium bromide (TPABr, the structure-directing material for ZSM-5 zeolite synthesis), the holding temperature and time, and the initial pressure were investigated. It was found that without TPABr only zeolite P could be synthesized at SiO2/Al2O3 mole ratios of 2.8-200. In order to synthesize ZSM-5 zeolite, sodium silicate solution was added to adjust the SiO2/Al2O3 mole ratio in raw ash. The yield of ZSM-5 zeolite was as high as 59 wt.% when following conditions were used: SiO2/Al2O3 mole ratio, 40; the holding temperature, 210 degreesC; the holding time, 4 h and the initial pressure, 4 bar. The catalytic performance for CO2 hydrogenation reaction of the ZSM-5 zeolite was preliminary tested and compared with that of commercial one. It was observed that there was no significant difference in the catalytic performance between these two catalysts. (C) 2004 Elsevier B.V. All rights reserved.