工业催化
工業催化
공업최화
INDUSTRIAL CATALYSIS
2014年
8期
603-608
,共6页
催化剂工程%二次生长法%Beta分子筛膜%N2O分解%硅溶胶
催化劑工程%二次生長法%Beta分子篩膜%N2O分解%硅溶膠
최화제공정%이차생장법%Beta분자사막%N2O분해%규용효
catalyst engineering%secondary crystallization method%Beta molecular sieve membrane%N2 O decomposition%silica sol
采用二次生长法，通过在晶种涂覆液中添加硅溶胶，在不锈钢丝网载体上制备牢固的 Beta分子筛膜，系统考察晶种层中硅溶胶含量、晶种涂覆量、结晶温度和结晶时间对分子筛膜生长的影响。实验中发现，硅溶胶的存在可以增加涂覆层的牢固度，促进 Beta 分子筛膜的生长；硅溶胶既具有黏合剂的作用又可以补充硅源。当涂覆量较低时，无法得到一个完整的分子筛膜，分子筛膜负载量随着涂覆量的增加而增加；当结晶温度升至一定程度，分子筛膜组成不再单一。晶化过程中伴随着晶种的脱落和溶解。制备的 Beta 分子筛膜对 N2 O 催化分解具有良好的催化活性。
採用二次生長法，通過在晶種塗覆液中添加硅溶膠，在不鏽鋼絲網載體上製備牢固的 Beta分子篩膜，繫統攷察晶種層中硅溶膠含量、晶種塗覆量、結晶溫度和結晶時間對分子篩膜生長的影響。實驗中髮現，硅溶膠的存在可以增加塗覆層的牢固度，促進 Beta 分子篩膜的生長；硅溶膠既具有黏閤劑的作用又可以補充硅源。噹塗覆量較低時，無法得到一箇完整的分子篩膜，分子篩膜負載量隨著塗覆量的增加而增加；噹結晶溫度升至一定程度，分子篩膜組成不再單一。晶化過程中伴隨著晶種的脫落和溶解。製備的 Beta 分子篩膜對 N2 O 催化分解具有良好的催化活性。
채용이차생장법，통과재정충도복액중첨가규용효，재불수강사망재체상제비뢰고적 Beta분자사막，계통고찰정충층중규용효함량、정충도복량、결정온도화결정시간대분자사막생장적영향。실험중발현，규용효적존재가이증가도복층적뢰고도，촉진 Beta 분자사막적생장；규용효기구유점합제적작용우가이보충규원。당도복량교저시，무법득도일개완정적분자사막，분자사막부재량수착도복량적증가이증가；당결정온도승지일정정도，분자사막조성불재단일。정화과정중반수착정충적탈락화용해。제비적 Beta 분자사막대 N2 O 최화분해구유량호적최화활성。
Using stainless steel mesh as the support,Beta molecular sieve membrane was prepared by adding silica sol into coating solution and adopting secondary crystallization method. The influence of silica sol contents in crystal seed layer,coating amounts of crystal seed,crystallization temperature and crystalli-zation time on the growth of molecular sieve membranes was investigated. The results indicated that the silica sol in the crystal seed layer could increase the solidity of the coating layer and promote the growth of Beta molecular sieve membranes;the silica sol was not only an adhesive but also the supplement of silicon source. The change of coating amount influenced the loading and integrity of membranes;the complete molecular sieve membrane could not be obtained under lower coating amount,and the loadings of molecular sieve membrane was enhanced with the increase of the coating amounts. When the crystallization tempera-ture increased to a certain extent,the composition of molecular sieve membranes was changed,and the seed dropped and dissolved during crystallization. Beta molecular sieve membranes exhibited good catalytic activity for N2 O decomposition.
