【摘要】：本文主要是通過浸漬法將已改性好的NH_2-SBA-15載體分別負(fù)載不同比例的Ag-Pd和Au-Pd,分別得到了Ag-Pd/NH_2-SBA-15體系和Au-Pd/NH_2-SBA-15體系的兩個(gè)體系的催化劑。在Ag-Pd/NH_2-SBA-15體系中,催化劑催化活性最好是Ag1Pd9/NH_2-SBA-15,在323 K時(shí),Ag1Pd9/NH_2-SBA-15催化劑的TOF的值高達(dá)964 h-1。在Au-Pd/NH_2-SBA-15體系中,催化活性最好的是Au2Pd8/NH_2-SBA-15,在323 K時(shí),Au2Pd8/NH_2-SBA-15催化劑的TOF非常高,達(dá)到了1786 h-1,催化效果極好。兩個(gè)的體系催化劑在經(jīng)過五次循環(huán)使用后,催化性能依然良好。催化劑的催化性能符合工業(yè)催化的基本規(guī)律,即隨著溫度升高,催化劑的的催化活性越高。甲酸鈉的量會(huì)對(duì)甲酸脫氫的催化劑影響很大,甲酸鈉的濃度越大,會(huì)提高甲酸脫氫的催化劑的性能。進(jìn)一步通過XRD、TEM、XPS、GC等表征手段對(duì)制備的催化劑的內(nèi)部結(jié)構(gòu)進(jìn)行分析和探究,Ag-Pd/NH_2-SBA-15體系和Au-Pd/NH_2-SBA-15兩個(gè)體系的催化劑均形成納米顆粒合金結(jié)構(gòu),化學(xué)性質(zhì)穩(wěn)定,且Ag1Pd9/NH_2-SBA-15和Au2Pd8/NH_2-SBA-15脫氫選擇性均是100%。
[Abstract]:In this paper, the modified NH_2-SBA-15 carrier was loaded with different proportion of Ag-Pd and Au-Pd, by impregnation method. The catalysts of Ag-Pd/NH_2-SBA-15 system and Au-Pd/NH_2-SBA-15 system were obtained respectively. In Ag-Pd/NH_2-SBA-15 system, the best catalytic activity of the catalyst is when Ag1Pd9/NH_2-SBA-15, is 323K, the value of TOF of Ag1Pd9/NH_2-SBA-15 catalyst is as high as 964h-1. In the Au-Pd/NH_2-SBA-15 system, the best catalytic activity is that when Au2Pd8/NH_2-SBA-15, is 323K, the TOF of Au2Pd8/NH_2-SBA-15 catalyst is very high, reaching 1786 h-1, and the catalytic effect is excellent. After five cycles, the catalytic performance of the two catalysts is still good. The catalytic activity of the catalyst accords with the basic law of industrial catalysis, that is, the higher the temperature, the higher the catalytic activity of the catalyst. The amount of sodium formate will have a great influence on the catalyst for the dehydrogenation of formic acid. The higher the concentration of sodium formate, the better the performance of the catalyst for dehydrogenation of formic acid. The internal structure of the prepared catalyst was further analyzed and explored by means of XRD,TEM,XPS,GC and other characterization methods. The catalysts of Ag-Pd/NH_2-SBA-15 system and Au-Pd/NH_2-SBA-15 system both formed nanocrystalline alloy structure and their chemical properties were stable. The dehydrogenation selectivity of both Ag1Pd9/NH_2-SBA-15 and Au2Pd8/NH_2-SBA-15 is 100.
【學(xué)位授予單位】：安徽工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O621.251

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