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作者(中文):楊子懿
作者(外文):Yang, Zih-Yi
論文名稱(中文):負載銅及硼之中孔洞二氧化矽材料的製備與催化應用
論文名稱(外文):Preparation and Catalytic Application of Copper- and Boron-containing Mesoporous Silica Materials
指導教授(中文):楊家銘
指導教授(外文):Yang, Chia-Min
口試委員(中文):洪嘉呈
張淑閔
口試委員(外文):Horng, Jia-Cherng
Chang, Sue-Min
學位類別:碩士
校院名稱:國立清華大學
系所名稱:化學系
學號:104023535
出版年(民國):107
畢業學年度:107
語文別:中文
論文頁數:96
中文關鍵詞:中孔洞二氧化矽銅觸媒氧化硼甲醇氧化反應
外文關鍵詞:mesoporous silicacopper catalystboron oxidemethanol oxidation reaction
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本研究以片狀SBA-15二氧化矽為載體,第一部份利用含浸法製備負載銅之中孔洞二氧化矽材料,發現不同的銅前驅物會影響材料於丙烯氧化反應之產物;第二部分則利用含浸法負載銅與硼,並研究硼含量及不同負載順序的影響,由X光光電子能譜儀,推測SBA-15中的氧化銅及氧化硼間有作用,且其間作用強弱受負載順序所影響,此外,由吡啶吸脫附鑑定發現負載順序亦會影響酸性位點數,而隨硼含量增加材料中之酸性位點強度下降,在氫氣程溫還原及N2O氧化反應結果中顯示,添加硼會使氧化銅還原溫度上升,且於先負載硼再負載銅之樣品中,銅物種之分散性與硼含量呈正相關。
我們將此含銅與硼的材料用於催化甲醇選擇氧化反應,發現硼的添加會影響觸媒於甲醇氧化反應之轉化率及甲醛選擇性,其中以先負載硼再負載銅,且B/Cu莫耳比為1之樣品催化效果最佳,甲醛產率可達43.7%,且表現良好的觸媒穩定性。
The research aims at studying the heterogeneous catalytic performances of copper supported on platelet mesoporous silica SBA-15. In the first part, we showed that the type of impregnated copper salt has impact on the selectivity of the catalyst in propene oxidation reaction. In the second part, boron is introduced as co-catalyst, and the influences of its impregnation sequence and amount on boron-copper interactions were investigated. X-ray photoelectron spectroscopy results suggested that the introducing sequence played a role in the interaction between copper oxide and boron oxide. Besides, pyridine adsorption tests revealed that the sequence also affected the number of Lewis acid site, and the copper acidity became weaker as the amount of boron increased. The results of H2-TPR and N2O oxidation showed that boron lowered the reducibility of the copper oxide, and the dispersion of copper species were improved by increasing amount of boron.
Finally, we applied the catalysts to methanol oxidation reaction and found that boron affected the conversion of methanol and the selectivity of formaldehyde. Among all prepared catalysts, the one with B/Cu molar ratio 1 and boron loaded prior to copper exhibited ideal stability and the high formaldehyde yield.
摘要 I
Abstract II
目錄 IV
圖目錄 VI
表目錄 VIII
第一章 緒論 1
1-1中孔洞二氧化矽材料 1
1-2負載金屬之中孔洞二氧化矽材料 7
1-3銅觸媒及其催化反應 13
1-3-1 甲醇氧化反應 14
1-3-2丙烯選擇性氧化 18
1-4氧化硼於異相催化上的應用 22
1-5研究動機 27
第二章 實驗部分 28
2-1 實驗藥品 28
2-2 中孔洞二氧化矽SBA-15之合成 29
2-3 負載銅於SBA-15 29
2-4 負載銅及硼於SBA-15 30
2-5 催化研究 32
2-5-1 異丙醇脫氫及脫水反應 32
2-5-2 甲醇氧化反應 33
2-5-3 丙烯選擇性氧化反應 35
2-6 材料分析簡介 36
2-6-1 X光粉末繞射 36
2-6-2 氮氣吸脫附 38
2-6-3 電子顯微術 43
2-6-4 紫外光/可見光光譜 44
2-6-5 X光光電子能譜 45
2-6-6 傅里葉轉換紅外光譜 45
2-6-7 吡啶吸附紅外光譜 46
2-6-8 氫氣程溫還原及N2O氧化 48
第三章 結果與討論 50
3-1 SBA-15之鑑定與分析 50
3-2 負載銅之SBA-15 52
3-2-1 材料之PXRD鑑定 52
3-2-2 丙烯選擇性氧化反應 53
3-3 負載銅及硼之SBA-15材料之鑑定分析55
3-3-1 材料結構分析 55
3-3-2 材料之銅及硼狀態鑑定分析 59
3-3-3 材料之氫氣程溫還原及分散性鑑定65
3-3-4 材料之酸鹼性質鑑定分析 68
3-4 甲醇氧化催化應用 73
3-4-1甲醇氧化反應 73
3-4-2甲醇氧化反應後之觸媒鑑定 77
第四章 結論 79
第五章 參考文獻 81
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