| 马雅婷,刘璐,罗明悦,赵玉宝.高比表面铀氧化物固体酸的制备及其催化乙醇脱水性能的研究[J].南华大学学报(自然科学版),2024,(6):63~69.[MA Yating,LIU Lu,LUO Mingyue,ZHAO Yubao.Preparation of Uranium Oxide-based Solid Acids with High Specific Surface Area and its Catalytic Performance for Ethanol Dehydration[J].Journal of University of South China(Science and Technology),2024,(6):63~69.] |
| 高比表面铀氧化物固体酸的制备及其催化乙醇脱水性能的研究 |
| Preparation of Uranium Oxide-based Solid Acids with High Specific Surface Area and its Catalytic Performance for Ethanol Dehydration |
| 投稿时间：2024-04-08 |
| DOI： |
| 中文关键词: 三氧化铀 酸改性 乙醇脱水 乙烯 |
| 英文关键词:uranium oxide acid modification ethanol dehydration ethylene |
| 基金项目:国家自然科学基金资助项目(22272074) |
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| 中文摘要: |
| 以未除去模板剂的介孔氧化硅为主体,经模板交换同时引入UO2＋2及SO2－4物种等过程,制得比表面积高达180 m2/g的铀氧化物固体酸。物性表征的分析结果表明,所得样品中的铀氧化物处于高分散状态,U为正六价;NH3程序升温脱附研究结果显示,高分散态铀氧化物固体酸的总酸量高达6.02 mmol/g,为体相铀氧化物固体酸的23倍;反应温度为300 ℃、乙醇重时空速为2.5 h－1时,高分散态铀氧化物固体酸的乙醇转化率和乙烯选择性均为100%。在体积分数为60%的乙醇、乙醇重时空速为2.5 h－1以及300 ℃反应条件下,高分散态铀氧化物表现出良好的酸催化稳定性:连续反应11 h,乙醇转化率保持在100%,乙烯的选择性保持在98.8%以上。 |
| 英文摘要: |
| The uranium oxide solid acid with high specific surface area of up to 180 m2/g is prepared by introducing UO2＋2 and SO2－4 species into mesoporous silicon oxide, without removing the template. The analysis results indicate that the uranium oxide in the samples are highly dispersed and U is hexavalent. The results of temperature-programmed desorption of ammonia show that the total acid content of highly dispersed uranium oxide solid acid is as high as 6.02 mmol/g, which is 23 times that of bulk phase uranium oxide solid acid. When the reaction temperature is 300 ℃ and the space velocity is 2.5 h－1, the ethanol conversion and the selectivity to ethylene of the highly dispersed uranium oxide solid acid are 100%. In ethanol with a volume fraction of 60%, WHSV of 2.5 h－1 and 300 ℃, the highly dispersed uranium oxide exhibits good catalytic stability:the conversion of ethanol hits 100% and the selectivity to ethylene remains above 98.8% after continuous reaction for 11 h. |
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