EFFECT OF PREPARATION METHOD ON THE ACIDITIES OF AL-B-OX MIXED OXIDES

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题名:	EFFECT OF PREPARATION METHOD ON THE ACIDITIES OF AL-B-OX MIXED OXIDES
作者:	LI,CP;CHEN,YW
贡献者:	化學工程與材料工程學系
关键词:	SOLID ACID CATALYSTS;ALUMINUM;PHOSPHATES
日期:	1993
上传时间:	2010-06-29 17:34:45 (UTC+8)
出版者:	中央大學
摘要:	A series of Al-B-O(x) metal oxides with various Al/B ratios were prepared with impregnation and coprecipitation methods. The surface acidic properties of these catalysts were examined by temperature-programmed desorption (TPD) of ammonia and the dehydration reaction of isopropanol. The dehydration reaction was carried out in a continuous-flow microreactor at 130-260-degrees-C under atmospheric pressure. The results of TPD of ammonia indicated that the surface acidity of Al-B-O(x) material is medium-strong. The acidic strengths are approximately the same for all the Al-B-O(x) samples, regardless of its preparation method. In addition, their acid strengths are much stronger than that of pure alumina. However, the acid concentration is increased with decreasing the Al/B atomic ratio of the catalyst. The dehydration activities of these catalysts are increased with decreasing the Al/B atomic ratios of the samples. The results also indicated that the addition of boron on alumina, no matter what preparation method is used, could significantly enhance the acidities of the catalysts. A compensation effect was observed in isopropanol dehydration reaction over these catalysts. The preexponential factor decreases and activation energy increases with increasing Al/B ratio of the catalyst. The results can be interpreted in terms of the acidity of the catalyst.
關聯:	CATALYSIS LETTERS
显示于类别:	[化學工程與材料工程研究所] 期刊論文

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