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Development of heteroatom-doped graphene and boron nitride catalysts for the application to CO hydrogenation and selective oxidation of methane
이원자가 도핑된 그래핀 및 보론나이트라이드 촉매의 일산화탄소 수소화반응과 메탄 선택적 산화반응으로의 응용

DC Field Value Language
dc.contributor.advisor정인-
dc.contributor.author박홍석-
dc.date.accessioned2018-05-28T16:29:27Z-
dc.date.available2018-05-28T16:29:27Z-
dc.date.issued2018-02-
dc.identifier.other000000150224-
dc.identifier.urihttps://hdl.handle.net/10371/140744-
dc.description학위논문 (박사)-- 서울대학교 대학원 : 공과대학 화학생물공학부, 2018. 2. 정인.-
dc.description.abstractEnormous effort has been undertaken for the development of efficient catalyst to achieve low cost and high productivity of chemical process. As the outstanding influence of interrelation between metal and supports is revealed the support materials have been focused by many studies. Among various materials, graphene and boron nitride, which has graphene-analogous structure, have drawn massive attention due to many opportunities in heterogeneous catalysis. The studies referred to herein, contain design of effective catalysts by introducing heteroatoms into graphene and boron nitride.
Optimizing the properties of a catalyst to obtain a desired level of catalytic activity is the goal of heterogeneous catalysis. Here, we tuned the catalytic activity via manipulating the electronic state of a catalyst, induced by facile doping method into graphene at metal/graphene system. Experimental results revealed that the electronic state of the catalyst was manipulated depending on the type, concentration, and doping structure of dopants. For CO hydrogenation reaction, the catalytic activities of metal/doped graphene catalysts were controlled toward increasing or decreasing way, up to 7.7 times, according to the electronic state of cobalt metal. It was revealed that change in the electronic state led to variations in the interactions between active metal and reactants by kinetic study and theoretical calculations, causing differences in catalytic performances. This strategy was proven to be applicable to not only transition metal and but also noble metal in other reaction such as 4-nitrophenol reduction.
The selective oxidation of methane is one of the most attractive and challenging process in the chemical industry. Here, we synthesized boron nitride (BN)-based catalysts containing atomically dispersed Fe site by means of pyrolytic method. The isolated single Fe sites were distributed throughout defective BN which consists of the typical B3N3 hexagonal structure but randomly oriented layers. The unprecedented catalyst, Fe-embedded BN (0.8Fe-BN), exhibited remarkable methane conversion (27%) and formaldehyde selectivity (52%) at 873 K. In comparison with Fe nanoparticle, the single Fe site, which is coordinated to oxygen atoms in square-pyramidal structure, dominantly served as the crucial active site and contributed to the enhanced catalytic performance. These results may provide more opportunities for the use of BN materials for heterogeneous catalysis.
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dc.description.tableofcontents1. Introduction 1
1.1 Graphene and boron nitride materials in heterogeneous catalysis 1
1.2 Effects of tunable electronic properties on catalytic activity 3
1.3 Design of single atom catalyst for selective oxidation of methane 3
1.4. Objectives 7
2. Tuning effects of electronic state in metal/graphene catalysts for the control of catalytic activity via N- and B-doping into graphene 42
2.1 Introduction 42
2.2 Experimental 45
2.2.1 Preparation catalysts 45
2.2.2 Characterization 45
2.2.3 Catalytic activity test 46
2.3 Results and discussion 48
2.3.1 Preparation and physicochemical properties of the catalysts 48
2.3.2 Electronic state of doped graphene and active metals 16
2.3.3 Reaction tests 19
2.3.4 Model reaction tests 22
3. Selective oxidation of methane over Fe-embedded boron nitride catalysts 38
3.1 Introduction 38
3.2 Experimental 41
3.2.1 Preparation of catalysts 41
3.2.2 Characterization methods 41
3.2.3 Measurements of catalytic performance 42
3.3 Results and discussion 44
3.3.1 Structural characterization 44
3.3.2 Atomically dispersed Fe species within boron nitride 48
3.3.3 Catalytic performance over Fe@BN catalysts 49
4. Summary and Conclusions 74
Bibliography 76
국 문 초 록 83
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dc.formatapplication/pdf-
dc.format.extent4402194 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectHeterogeneous catalyst-
dc.subjectsingle atom catalyst-
dc.subjectmethane-
dc.subjectselective oxidation-
dc.subjectdoping-
dc.subjectelectronic state-
dc.subjectgraphene-
dc.subjecthydrogenation-
dc.subject.ddc660.6-
dc.titleDevelopment of heteroatom-doped graphene and boron nitride catalysts for the application to CO hydrogenation and selective oxidation of methane-
dc.title.alternative이원자가 도핑된 그래핀 및 보론나이트라이드 촉매의 일산화탄소 수소화반응과 메탄 선택적 산화반응으로의 응용-
dc.typeThesis-
dc.description.degreeDoctor-
dc.contributor.affiliation공과대학 화학생물공학부-
dc.date.awarded2018-02-
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Theses (Ph.D. / Sc.D._화학생물공학부)
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