Study of Ni Catalysts with Different Al₂O₃ Supports in the Partial Oxidation of Methane Reaction

Abstract

Ni-based catalysts have been widely investigated in the partial oxidation of methane (POM). However, sintering and carbon deposition are severe problems for Ni-based catalysts in the POM reaction. Here, Ni/Al2O3 catalysts with Al2O3 supports prepared by different synthesis methods are used to investigate the effect of strong metal–support interaction (SMSI) and their relationships to the catalytic performance. As a result, the different strengths of SMSI between Ni species and various Al2O3 supports contribute to generating different contents of the reduced metallic Ni0 sites in the catalysts, which affects the catalytic activity in the POM reaction obviously. The surface unsaturated pentahedral coordination Al3+ centers supply SMSI in the Ni/Al2O3-H catalyst to prevent the catalyst from sintering and coking in the POM reaction, which results in better catalytic activity and catalyst stability. A new view is provided to solve the design of stable metal oxide catalysts by utilizing their SMSI effect.

Catalysts Derived from Al–Ni Intermetallic Compounds for Efficient Selective Semihydrogenation of Phenylacetylene

“…As the Ni content increases, the Ni 0 spectrum signal gradually intensifies, with a minor chemical shift to low binding energy and an accompanying decrease in the full width at half-maximum (fwhm). Quantitative analysis of XPS for Ni 2p 3/2 and Al 2p is used to account for changes in elemental binding energies due to changes in the metal content, as shown in Table S2. The metallic Ni 0 species increases with an increasing Ni content.…”

Functional CeOx Stabilized Metallic Ni Catalyst Supported on Boron Nitride for Durable Partial Oxidation of Methane to Syngas at High Temperature

“…In addition, Ni-based catalysts have proven to be effective due to their distinct chemical and physical properties. − However, Ni catalysts are susceptible to experiencing issues such as whisker-like carbon formation, metal sintering, and phase transition to an inactive oxidized state. These factors are the main reasons for catalyst deactivation. , It is known that the catalyst supports, such as Al 2 O 3 , TiO 2 , CeO 2 , and La 2 O 3 , etc., play a crucial function in enhancing the catalysts’ catalytic property by improving the dispersion of the active metals with stable structural stability and reducing the formation of carbon on their surfaces. , Moreover, a number of significant endeavors, such as incorporating catalyst promoters, creating restricted structures, tuning the metal support interactions via alloying with secondary metals has been attempted to develop Ni-based catalysts with good performance for POM reactions. − …”