Abstract
The catalytic performance of Mo8V2Nb1-based mixed-oxide catalysts for ethane partial oxidation is highly sensitive to the doping of elements with redox and acid functionality. Specifically, control over product distributions to ethylene and acetic acid can be afforded via the specific pairing of redox elements (Pd, Ni, Ti) and acid elements (K, Cs, Te) and the levels at which these elements are doped. The redox element, acid element, redox/acid ratio, and dopant/host ratio were investigated using a three-level, four-factor factorial screening design to establish relationships between catalyst composition, structure, and product distribution for ethane partial oxidation. Results show that the balance between redox and acid functionality and overall dopant level is important for maximizing the formation of each product while maintaining the structural integrity of the host metal oxide. Overall, ethylene yield was maximized for a Mo8V2Nb1Ni0.0025Te0.5 composition, while acetic acid yield was maximized for a Mo8V2Nb1Ti0.005Te1 catalyst.
Highlights
The catalytic conversion of ethane into olefins and chemicals has been a subject of much research over the past several decades [1,2]
The formation of a uniform solid solution of the Mo-V-O oxide has been widely reported to lead to the preferential oxidation of alkanes to olefins and acids [15,35,36]
Niobium has been reported as a stabilizing agent in the Mo-V-O structure, helping keep the vanadium and molybdenum species stable throughout the reaction [8,16,17,18] by facilitating their redox cycles
Summary
The catalytic conversion of ethane into olefins and chemicals has been a subject of much research over the past several decades [1,2]. State-of-the-art catalysts for the partial oxidation of short alkanes are typically based on molybdenum and vanadium mixed oxides, which have been shown to preferentially form value-added products such as acrylic acid and acetic acid [9,12,13,14,15,16,17,18,19,20]. Elements such as niobium and antimony have been added to these Mo-V-O structures with the objective of increasing their structural stability and maintaining the desired Mo-V phase [10]. Nb was found to be the most effective stabilizing agent for the Mo-V-M-O structure, resulting in the mitigation of phase segregation and increased activity in both ethane partial oxidation [10,16,22] and ethane oxidative dehydrogenation [20,23]
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