燕山大学学报
燕山大學學報
연산대학학보
JOURNAL OF YANSHAN UNIVERSITY
2013年
3期
206-210
,共5页
霍全%宋建争%林立君%宋金凤%潘惠芳
霍全%宋建爭%林立君%宋金鳳%潘惠芳
곽전%송건쟁%림립군%송금봉%반혜방
L 沸石%W 沸石%杂晶%抑制作用
L 沸石%W 沸石%雜晶%抑製作用
L 비석%W 비석%잡정%억제작용
zeolite L%zeolite W%mixed crystal%suppressing effect
在 L 沸石合成体系中加入不同金属盐,考察它们对杂晶 W 沸石的抑制作用。采用 X 射线衍射(XRD)、低温氮吸附和扫描电子显微镜(SEM)对沸石样品进行了表征。结果表明:当合成体系中加入少量的 W 沸石晶种可造成 L 沸石的相对结晶度显著下降, W/ L 值(以 W 沸石与 L 沸石 XRD 特征衍射峰峰强度之比表示 W 沸石在 L-W 沸石中的含量)大幅升高;在含有一定量 W 沸石晶种的体系中加入等量的不同金属盐做比较,其中Mg NO32抑制效果好,且当 Mg NO32含量为150 g/g 时,抑制效果达最佳,其 L 沸石的相对结晶度为88.3%, W/ L 值为0.047,与未添加抑制剂的空白样相比, W/ L 值下降率达91.2%;在10 L 反应釜放大合成 L 沸石的体系中添加适宜量的 Mg NO32,可有效抑制 W 沸石生成,合成样品中无 W 沸石相出现,其相对结晶度达98.6%。
在 L 沸石閤成體繫中加入不同金屬鹽,攷察它們對雜晶 W 沸石的抑製作用。採用 X 射線衍射(XRD)、低溫氮吸附和掃描電子顯微鏡(SEM)對沸石樣品進行瞭錶徵。結果錶明:噹閤成體繫中加入少量的 W 沸石晶種可造成 L 沸石的相對結晶度顯著下降, W/ L 值(以 W 沸石與 L 沸石 XRD 特徵衍射峰峰彊度之比錶示 W 沸石在 L-W 沸石中的含量)大幅升高;在含有一定量 W 沸石晶種的體繫中加入等量的不同金屬鹽做比較,其中Mg NO32抑製效果好,且噹 Mg NO32含量為150 g/g 時,抑製效果達最佳,其 L 沸石的相對結晶度為88.3%, W/ L 值為0.047,與未添加抑製劑的空白樣相比, W/ L 值下降率達91.2%;在10 L 反應釜放大閤成 L 沸石的體繫中添加適宜量的 Mg NO32,可有效抑製 W 沸石生成,閤成樣品中無 W 沸石相齣現,其相對結晶度達98.6%。
재 L 비석합성체계중가입불동금속염,고찰타문대잡정 W 비석적억제작용。채용 X 사선연사(XRD)、저온담흡부화소묘전자현미경(SEM)대비석양품진행료표정。결과표명:당합성체계중가입소량적 W 비석정충가조성 L 비석적상대결정도현저하강, W/ L 치(이 W 비석여 L 비석 XRD 특정연사봉봉강도지비표시 W 비석재 L-W 비석중적함량)대폭승고;재함유일정량 W 비석정충적체계중가입등량적불동금속염주비교,기중Mg NO32억제효과호,차당 Mg NO32함량위150 g/g 시,억제효과체최가,기 L 비석적상대결정도위88.3%, W/ L 치위0.047,여미첨가억제제적공백양상비, W/ L 치하강솔체91.2%;재10 L 반응부방대합성 L 비석적체계중첨가괄의량적 Mg NO32,가유효억제 W 비석생성,합성양품중무 W 비석상출현,기상대결정도체98.6%。
@@@@Different metal salts are introduced into the synthetic system of zeolite L, and the suppressing effects of the mixed crystal W are investigated. X-ray diffraction (XRD), nitrogen adsorption isotherms and scanning electron microscopy (SEM) are used for the physicochemical characterization of zeolite samples. The results indicate that a small number of zeolite W crytsal seeds added into the synthetic system of zeolite L remarkably decrease the relative crystallinity of zeolite L, leading to the increase of the peak intensity ratio of zeolite W to zeolite L, / . However, zeolite W could be effectively suppressed by the different metal salts among which magnesium nitrate ( ) is proven to facilitate to suppress the mixed crystal. And the suppressing effect ex-hibited optimal with , relative crystallinity of zeolite L and / being 150 g/g, 88.3%, and 0.047. The decrease rate of the / value is 91.2% compared with the sample without suppressing agents. The results also show that the appropriate amount of Mg NO3 2 is very effective in suppressing the formation of zeolite W in the synthetic system of 10 L autoclave for zeolite L. Zeolite W phase is not detected in the synthetic sample, where the relative crystalllinity is 98.6%.