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Studies on Preparation, Characterization and Application of Hexagonal Mesoporous Silicas Assembled by Two Metallic Elements

Author: ZhangZhenRong
Tutor: WanLong
School: Hunan University
Course: Materials Science
Keywords: Main - Object Assembly Hexagonal mesoporous silica composite Preparation Characterization Application
CLC: TB383
Type: Master's thesis
Year: 2005
Downloads: 130
Quote: 0
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Abstract


In this thesis, the binary metal-doped hexagonal mesoporous silica composite primary - object structure and assembly technology and its N 2 adsorption characteristics and to explore its reduction in cigarette tar harmful aspects of the application. In the water - ethanol - isopropanol solvent system at room temperature three yuan HMS mesoporous materials were synthesized and compared two methods of removing the merits of the templating agent and discusses the main factors affecting HMS synthesis and assembly of hexagonal mesoporous structure physical and chemical processes. When the reaction system consisting of: n (TEOS): n (dodecylamine) = 4:1, V (isopropyl alcohol): V (water): V (ethanol) = 1.0:8.5:5.0 (where n - Moore, V - volume), the use of ethanol extraction of the sample after removal of the templating agent has a \Additives - after adding isopropanol mesoporous pore size increases, BJH average pore diameter of 4.5nm, BET surface area of ??933.4m 2 / g, pore volume 1.038cm 3 / g. Template removal by ethanol extraction is better than the high-temperature calcination. In situ incorporation and post-synthesis assembly prepared Ce / HMS mesoporous materials, and their structure and properties were compared. After two methods Ce doped samples have the basic characteristics of HMS, Ce-doped inorganic framework to curb the contraction, so that mesoporous silica thermal stability increased. After the assembly method is the preparation of synthetic metal-doped mesoporous materials is the better way. In situ incorporation step synthesis of Ce, Al / SiO 2 Micro porous materials, and the effects of Al, Ce hydrothermal stability after incorporation. After the assembly method using synthetic two-step synthesis and impregnation method Pd / Ce-HMS mesoporous material, comparative study of Pd species supported on a carrier in both samples after mesoporous structure and morphology. The results showed that, Al, Ce-doped silicon oxide improved hydrothermal stability. The Pd loading can only get to a pure HMS microporous material, and loading to Ce / HMS able to get on the skeleton of ordered mesoporous materials. CeO 2 in the presence of Pd species to promote the dispersion of the carrier. Loading of Pd mesoporous composite materials as filter tip additives, when dosage of 2.3%, the test tar in cigarette smoke 8.44mg / branch, CO content of 12.6mg / support, and control cigarette (tar 15.99mg / support, CO13.8mg / branch) compared to tar and CO were reduced by 46.9% and 8.7%, and the sensory quality of test cigarettes remained basically unchanged.

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