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Role of Boron in Enhancing the Catalytic Performance of Supported Platinum Catalysts for the Nonoxidative Dehydrogenation of n-Butane
ACS Catalysis ( IF 11.3 ) Pub Date : 2020-01-07 , DOI: 10.1021/acscatal.9b04689 Carly Byron , Shi Bai , Gokhan Celik 1 , Magali S. Ferrandon 1 , Cong Liu 1 , Chaoying Ni , Ali Mehdad , Massimiliano Delferro 1 , Raul F. Lobo , Andrew V. Teplyakov
ACS Catalysis ( IF 11.3 ) Pub Date : 2020-01-07 , DOI: 10.1021/acscatal.9b04689 Carly Byron , Shi Bai , Gokhan Celik 1 , Magali S. Ferrandon 1 , Cong Liu 1 , Chaoying Ni , Ali Mehdad , Massimiliano Delferro 1 , Raul F. Lobo , Andrew V. Teplyakov
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Platinum-based supported catalysts for hydrocarbon conversion are among the most effective for selective dehydrogenation and isomerization processes. However, high process temperatures and the possibility of coke formation require catalyst modifications to mitigate such effects. One of the emerging approaches to prevent platinum catalyst deactivation is the use of boron additives that have been proposed to prevent coking. Despite such a valuable property of boron, the mechanisms for extending the catalyst lifetime and the decrease in coke formation based on this method are still poorly understood. The type and transformations of boron species on silica surface were investigated as a function of boron introduction, platinum addition, catalyst activation, and catalytic reactivity by a combination of X-ray photoelectron spectroscopy, electron microscopy, solid-state nuclear magnetic resonance spectroscopy, and density functional theory calculations to uncover the possible role of boron modification in improving the catalytic performance. Catalytic nonoxidative dehydrogenation of n-butane revealed that incorporation of boron improved the catalytic activity (∼3×) and stability of Pt/SiO2. The role of boron in enhancing catalytic performance was attributed to facilitating the migration of alkyl groups from platinum catalytic centers to tetrahedrally coordinated boron sites.
中文翻译：
硼在增强负载型铂催化剂对正丁烷非氧化脱氢的催化性能中的作用
用于烃转化的铂基负载型催化剂是最有效的选择性脱氢和异构化方法。但是，高工艺温度和形成焦炭的可能性要求对催化剂进行改性以减轻这种影响。防止铂催化剂失活的新兴方法之一是使用已提出的防止焦化的硼添加剂。尽管硼具有这种宝贵的性能，但仍不清楚基于该方法延长催化剂寿命和减少焦炭形成的机理。通过结合X射线光电子能谱研究了二氧化硅表面上硼物种的类型和转变与硼引入，铂添加，催化剂活化和催化反应性的关系，电子显微镜，固态核磁共振波谱和密度泛函理论计算，以揭示硼修饰在改善催化性能中的可能作用。催化剂的催化非氧化脱氢正丁烷表明，硼的引入提高了Pt / SiO 2的催化活性（约3倍）和稳定性。硼在增强催化性能中的作用归因于促进烷基从铂催化中心向四面配位的硼位点的迁移。
更新日期：2020-01-07
中文翻译：
硼在增强负载型铂催化剂对正丁烷非氧化脱氢的催化性能中的作用
用于烃转化的铂基负载型催化剂是最有效的选择性脱氢和异构化方法。但是，高工艺温度和形成焦炭的可能性要求对催化剂进行改性以减轻这种影响。防止铂催化剂失活的新兴方法之一是使用已提出的防止焦化的硼添加剂。尽管硼具有这种宝贵的性能，但仍不清楚基于该方法延长催化剂寿命和减少焦炭形成的机理。通过结合X射线光电子能谱研究了二氧化硅表面上硼物种的类型和转变与硼引入，铂添加，催化剂活化和催化反应性的关系，电子显微镜，固态核磁共振波谱和密度泛函理论计算，以揭示硼修饰在改善催化性能中的可能作用。催化剂的催化非氧化脱氢正丁烷表明，硼的引入提高了Pt / SiO 2的催化活性（约3倍）和稳定性。硼在增强催化性能中的作用归因于促进烷基从铂催化中心向四面配位的硼位点的迁移。
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