Citation:
	            
		            CHEN  Hong-Li, DING  Jian, WANG  Yi-Meng. Synthesis of Hierarchical M -Containing Silicalite-1 Zeolites with High Hydrothermal Stability[J]. Acta Physico-Chimica Sinica,
							;2013, 29(05): 1035-1040.
						
							doi:
								10.3866/PKU.WHXB201302223
						
					
				
					
				
	        
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Hierarchical M /silicalite-1 composites were synthesized via hydrothermal treatment of M -supported porous silica using tetrapropylammonium hydroxide (TPAOH) as a template. M species were introduced into porous silica via solid-state grinding and subsequent calcination. X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM) results indicated that M was uniformly distributed in the zeolite crystals. The hydrothermal stability of M / silicalite-1 before and after acid washing was detected by treatment at 800℃ in 100% steam for 10 h. The introduction of M increased the hydrothermal stability of M /silicalite-1 samples. Furthermore, acid washing could remove M impurities, increasing the relative crystallinity of samples compared with that of calcined M /silicalite-1 and introducing mesopore into zeolite simultaneously. N2 adsorption-desorption measurements indicated that mesopores were generated in the zeolite crystals by the removal of M species. The improved hydrothermal stability and the generation of mesopores in these M /silicalite-1 samples play important roles in preserving zeolite structure, enhancing coke tolerance, slowing deactivation, and extending catalyst life during high-temperature reaction.
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								Keywords:
								
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M
, - Zeolite,
 - Hydrothermal stability,
 - Hierarchical porosity
 
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