第1筆 /總和 1 筆
/ 1 筆
頁籤選單縮合
題名 | Sol Preparation from Zirconyl Chloride Octahydrate in Amine-Ammonia Solution=從氯氧化鋯在胺和氨水溶液中製備凝膠之研究 |
---|---|
作者 | 王茂齡; 任啟中; 劉炳郎; 史宗淮; | 書刊名 | 中國工程學刊 |
卷期 | 22:4 1999.07[民88.07] |
頁次 | 頁423-433 |
專輯 | 化學工程 |
分類號 | 341.345 |
關鍵詞 | 非酸性錯合物試劑; DEA及TEA; 凝膠製備; 氧化鋯前驅物; 反應機構及動力學; Non-acid complex agent; DEA and TEA; Sol preparation; Precursor of zirconium oxide; Reaction mechanism and kinetics; |
語文 | 英文(English) |
中文摘要 | 為了以氯氧化鋯( zirconyl chloride octahydrate, ZrOCl��, 8H�烙 )製備凝 膠( sol gel ),在本研究中嘗試幾種不同非酸性胺類化合物( non-acid amines ),包 含雙乙烯基雙胺( diethylenediamine, DEDA ), 三乙烯基雙胺( triethylenediamine, TEDA ),單乙醇基胺( monoethanolamine, MEA ),雙乙醇基胺( diethanolamine, DEA )及三乙醇基胺( triethanolamine, TEA )測定是否適合做為錯合劑與氫氧化銨形成離子 化錯合物。 在研究結果,發現到在這些非酸性胺類化合物中只有雙乙醇基胺( DEA )及三 乙醇基胺( TEA )可做為錯合劑與氫氧化銨及氯氧化鋯形成氧化鋯前驅物( precursos ) 之凝膠。 在凝膠形成之反應機構在本研究中倡導包含了水解( hydrolysis )及縮合反應( condensation )之連續二個步驟, 經由水解之步驟,在水溶液中首先形成一個四個體核心 之錯合分子( [Zr �� (OH) �� (OH �� ) �� ) ���� ] ), 然後形成一個較大錯合分子( [Zr �� (OH) �� (OH �� ) �蕘澡��a ] ���� (HN(R-O-) �荃滋� ) �a和 [Zr �� (OH) �崏� ���a (OH �� ) �� ] ���� (NH(R-O-) �荃滋� ) �a for DEA ,及 [Zr �� (OH) �� (OH �� ) �蕘澡��a ] ���� (N(R-O-) �婀譴� ) �a和 [Zr �� (OH) �崏澡��a (OH �� ) �� ] (N(R-O-) �婀譴� ) �a for TEA ) 及藉縮合反應產生。 反應條件所影響之凝膠粘度及凝膠 平均顆粒之大小尺寸之實驗結果發現到可以由本研究所倡導之反應機構做合理之解釋,反應 條件如:溫度,ZrOCl �� /H �� O 莫耳比, 氨用量,攪拌速率等對凝膠粘度及其平均顆粒 大小尺寸之影響均在本研究中做深入之探討。 |
英文摘要 | Several non-acid amines including diethylenediamine (DEDA), trimethylenediamine (TEDA), rnonoethanolamine (MEA), diethanolamine (DEA) and triethanolamine (TEA), were examined in order to understand their suitability for being used as complex agents in the reaction with ammonium hydroxide to form ionized complex agents in the sol preparation from zirconyl chloride octahydrate. Only DEA and TEA amongst the non-acid complex agents could produce the sol of the precursor of zirconium oxide, by reaction of zirconyl chloride octahydrate (ZrOCl�砥D8H�烙) and TEA (or DEA) in ammonia solution. The reaction mechanism of sol formation, which includes sequential hydrolysis and condensation, has been proposed here. A tetranuclear complex molecule ([Zr �� (OH) �� (OH �� ) �� ) ���吞) is first produced in the aqueous solution via hydrolysis, and a larger complex molecule [Zr �� (OH) �� (OH �� ) �蕘澡��a ] ���� (HN(R-O-) �荃滋� ) �a and [Zr �� (OH) �崏澡��a (OH �� ) �� ] ���� (NH(R-O-) �荃滋� ) �a for DEA ,and [Zr �� (OH) �� (OH �� ) �蕘澡��a ] ���� (N(R-O-) �� �譴� ) �aand [Zr �� (OH) �崏澡��a (OH �� ) �� ] (N(R-O-) �婀譴� ) �a for TEA) is subsequently generated via condensation. The viscosity of the sol and average size of the sol particles, which have been observed to be affected by the reaction conditions, can be explained by the proposed mechanism. The effects of reaction conditions, such as temperature, molar ratio of ZrOCl��/H�烙, amount of ammonia, and agitation speed, on the viscosity of the sol and average size of the particles have been investigated. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。