摘要
以莱西钙基膨润土为原料,研究了常规离子交换法、微波合成法、超声合成法和水热合成法对制备柱撑蒙脱石(PILM)的影响。为了得到大层间距的PILM,引入自制的有机硅溶胶,并将Fe^(3+)和cr^(3+)负载到硅溶胶上,制备了一系列的Fe/cr-Si-PILM,并用XRD、DTA-TG和SRF等进行了表征。结果表明,微波、超声和水热法均是具有应用前景的合成方法;常规离子交换法中,引入有机硅溶胶可以显著增大PILM的层间距,经300℃焙烧2 h后,最大的层间距为4.33 am,热稳定性可达643℃。探索了Fe/Cr-si-PILM催化剂在煤炭液化中的应用,希望能开拓PILM催化剂应用的新领域。
Preparation of pillared montmorillonite (PILM) was studied,using Laixi Ca-bentonite as the starting material and by different methods (conventional intercalation,microwave irradiation,ultrasonic activation and hydrothermal) .In order to obtain large basal spacing [d(001)],large polymer ions prepared by hydrolyzing the mixture of silica sol and Fe^(3+)/Cr^(3+) aqueous solution were intercalated into the montmorillonite to form Fe/Cr-Si-PILM,which was then characterized by XRD,DTA-TG and XRF.The results showed that microwave irradiation,ultrasonic activation and hydrothermal methods were all promising methods for synthesis of Fe/Cr-Si pillared montmorillonite;for conventional intercalation method, intercalation of silica sol remarkably increased the basal spacing,with thermal stability up to 643 ℃ and basal spacing up to 4.33 nm after calcination at 300 ℃ for 2 h.Catalytic activity of Fe/Cr-Si-PILM catalysts in coal liquefaction was investigated with satisfactory results.
出处
《工业催化》
CAS
2009年第8期34-38,共5页
Industrial Catalysis
关键词
催化剂工程
柱撑蒙脱石催化剂
膨润土
超声波合成法
微波合成法
煤炭液化
catalyst engineering
pillared montmorillonite catalyst
bentonite
ultrasonic activation
microwave irradiation
coal liquefaction
