Abstract
As a favorably clean fuel, syngas (synthesis gas) production has been the focus of concern in past decades. Substantial literatures reported the syngas production by various catalytic reforming reactions particularly in methane or ethanol reforming. Among the developed catalysts in these reforming processes, Ni-based catalysts from hydrotalcite-like compounds (HTLcs) precursors have drawn considerable attention for their preferable structural traits. This review covers the recent literature reporting syngas production with Ni-based catalysts from HTLc precursors via methane or ethanol reforming. The discussion was initiated with catalyst preparation (including conventional and novel means), followed by subsequent thermal treatment processes, then composition design and the addition of promoters in these catalysts. As Ni-based catalysts have thermodynamic potential to deactivate because of carbon deposition or metal sintering, measures for dealing with these problems were finally summarized. To obtain optimal catalytic performances and resultantly better syngas production, based on analyzing the achievements of the references, some perspectives were finally proposed.
Highlights
As a consequence of global environmental pollution and fuel crisis issues, many efforts have been made to produce energy in a clean manner
Methane-reforming processes are a batch of reactions, such as partial oxidation of methane (simplified as POM, Equation (1)), steam reforming of methane (simplified as SRM, Equation (2)), autothermal reforming that is a combination of partial oxidation and steam reforming, and carbon dioxide reforming of methane (simplified as CRM, Equation (3))
Serrano-Lotina et al [19] synthesized hydrotalcite-like precursors and evaluated the catalytic performances of their subsequently derived catalyst for methane reforming of carbon dioxide
Summary
As a consequence of global environmental pollution and fuel crisis issues, many efforts have been made to produce energy in a clean manner. The combination of these reforming processes can be performed to manipulate the syngas composition purposefully, e.g., the tri-reforming means the co-occurrence of three reforming of POM, SRM, and CRM Other reforming such as steam or carbon dioxide reforming of ethanol or glycerol have been extensively investigated. Ni-based catalysts with HTLcs as precursors were extensively used in catalytic reforming reactions for syngas production. We will cover literature on the catalytic performances of Ni-based catalysts using hydrotalcites as precursors (denoted as Ni-based HTLcs) in syngas production via reforming reactions, in methane or ethanol reforming, including the influences of preparation methods, thermal treatment, reduction process, composition content, and promoters
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