Forced Dynamic (Operando) Catalytic Reactors to Accelerate the Model Discovery in C1 Chemistries
C1R develops forced dynamic and operando reactors to study the mechanisms and kinetics of C1 chemistry, mainly CO₂ hydrogenation and dry reforming of methane. Periodic changes in feed and conditions are used to probe and steer the catalyst state, while several operando techniques record structure and performance at the same time [146, 118] [patent 14].
- Forced dynamic operation of reforming catalysts [205, 200]
- Catalyst stability and coke control in dry reforming [166, 157, 153, 136] [patent P2]
- Microkinetic modeling [168]
Engineering the TiOx Overlayer on Ni Catalyst to Balance Conversion and Stability for Methane Dry-CO2 Reforming
by
Bai, Yao, Cheng, Mohamed, Telalovic, Melinte, Emwas, Gascon
ACS Sustainable Chem. Eng.
Year:
2024
DOI:
https://doi.org/10.1021/acssuschemeng.3c07051
Abstract
Ni-supported catalyst is a viable system to convert methane and carbon dioxide into syngas through methane dry reforming, with the main drawbacks of its fast deactivation being sintering and coking. Here, we developed methods to engineer a TiOx overlayer on Ni/TiO2 catalysts to shield the catalyst against sintering and coking while preserving the Ni accessibility and, thus, conversion. These methods involved altering TiO2crystal phases, pretreatment, and reaction conditions in the reforming stage. Through characterization, testing, and operando spectroscopy, we found that the TiOx overlayer with incomplete Ni coverage maintained a balanced conversion and stability by quenching the sintering and coking. Conversely, thick or nonexistent overlayers led to lower conversions or faster deactivation. The formation of TiOx overlayer increased the CO2activation capacity and oxygen mobility and protected Ni from sintering by its shield function. At the same time, the reaction pathways remained unchanged despite the TiOx overlayer with different morphologies.
Keywords
CHA
HCE
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