The enhanced reactivity of graphitic supports for Pd catalyzed toluene hydrogenation

IF 6.5 1区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Catalysis Pub Date : 2025-02-20 DOI:10.1016/j.jcat.2025.116029

Alaba U. Ojo , Deependra M. Shakya , Julian Stetzler , Musbau Gbadamosi , Rahman Md. Masudur , Narayan Acharya , Nathan Thornburg , John Tengco , Santosh Kiran Balijepalli , John R. Monnier , Donna A. Chen , John R. Regalbuto

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Abstract

The hydrogenation of toluene to methylcyclohexane has recently been explored as a potential liquid hydrogen carrier system whereby methylcyclohexane can be safely and efficiently transported. Supported metal catalysts are currently being studied and optimized for this application. In this work, a pronounced support effect is demonstrated. Palladium catalysts on graphitic carbons were found to exhibit significantly enhanced toluene hydrogenation rates versus activated carbons and silica supports. Hydrogen temperature programmed desorption results appear to rule out the role of intercalated hydrogen. Using characterization by powder XRD, Raman and x-ray photoelectron spectroscopies, it is suggested that the enhancement in activity arises when a critical degree of crystallinity at the support surface enhances toluene adsorption and opens parallel reaction pathways.

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来源期刊

Journal of Catalysis 工程技术-工程：化工

CiteScore

12.30

自引率

5.50%

发文量

447

审稿时长

31 days

期刊介绍： The Journal of Catalysis publishes scholarly articles on both heterogeneous and homogeneous catalysis, covering a wide range of chemical transformations. These include various types of catalysis, such as those mediated by photons, plasmons, and electrons. The focus of the studies is to understand the relationship between catalytic function and the underlying chemical properties of surfaces and metal complexes. The articles in the journal offer innovative concepts and explore the synthesis and kinetics of inorganic solids and homogeneous complexes. Furthermore, they discuss spectroscopic techniques for characterizing catalysts, investigate the interaction of probes and reacting species with catalysts, and employ theoretical methods. The research presented in the journal should have direct relevance to the field of catalytic processes, addressing either fundamental aspects or applications of catalysis.