甲酸在钯基催化剂下的脱氢性能研究
发布时间：2018-10-31 09:27
【摘要】：本文主要是通过浸渍法将已改性好的NH_2-SBA-15载体分别负载不同比例的Ag-Pd和Au-Pd,分别得到了Ag-Pd/NH_2-SBA-15体系和Au-Pd/NH_2-SBA-15体系的两个体系的催化剂。在Ag-Pd/NH_2-SBA-15体系中,催化剂催化活性最好是Ag1Pd9/NH_2-SBA-15,在323 K时,Ag1Pd9/NH_2-SBA-15催化剂的TOF的值高达964 h-1。在Au-Pd/NH_2-SBA-15体系中,催化活性最好的是Au2Pd8/NH_2-SBA-15,在323 K时,Au2Pd8/NH_2-SBA-15催化剂的TOF非常高,达到了1786 h-1,催化效果极好。两个的体系催化剂在经过五次循环使用后,催化性能依然良好。催化剂的催化性能符合工业催化的基本规律,即随着温度升高,催化剂的的催化活性越高。甲酸钠的量会对甲酸脱氢的催化剂影响很大,甲酸钠的浓度越大,会提高甲酸脱氢的催化剂的性能。进一步通过XRD、TEM、XPS、GC等表征手段对制备的催化剂的内部结构进行分析和探究,Ag-Pd/NH_2-SBA-15体系和Au-Pd/NH_2-SBA-15两个体系的催化剂均形成纳米颗粒合金结构,化学性质稳定,且Ag1Pd9/NH_2-SBA-15和Au2Pd8/NH_2-SBA-15脱氢选择性均是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.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O621.251
本文编号：2301664
[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.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O621.251
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