Abstract
Steam reforming of glycerol to produce hydrogen is considered to be the very promising strategy to generate clean and renewable energy. The incipient-wetness impregnation method was used to load Ni on the reducible carrier TiO2 (P25). In the process of catalyst preparation, the interaction and electronic effect between metal Ni and support TiO2 were adjusted by changing the calcination temperature, and then the activity and hydrogen production of glycerol steam reforming reaction (GSR) was explored. A series of modern characterizations including XRD, UV-vis DRS, BET, XPS, NH3-TPD, H2-TPR, TG, and Raman have been applied to systematically characterize the catalysts. The characterization results showed that the calcination temperature can contribute to varying degrees of influences on the acidity and basicity of the Ni/TiO2 catalyst, the specific surface area, together with the interaction force between Ni and the support. When the Ni/TiO2 catalyst was calcined at 600 °C, the Ni species can be produced in the form of granular NiTiO3 spinel. Consequently, due to the moderate metal–support interaction and electronic activity formed between the Ni species and the reducible support TiO2 in the NiO/Ti-600C catalyst, the granular NiTiO3 spinel can be reduced to a smaller Ni0 at a lower temperature, and thus to exhibit the best catalytic performance.
Highlights
Hydrogen energy has gradually attracted people’s research interest because it is regarded as a promising high-efficiency clean energy and is widely used in the chemical and petroleum industries, especially in fuel cell power generation [1,2]
To the best of our knowledge, there is no report on the electronic effect of Ni/TiO2 catalyst on its initial catalytic performance, as well as the influence of mixed-alcohol feeds with different volume ratios of glycerol and methanol on the reaction (GMSR)
We found that the calcination temperature of the Ni/TiO catalyst during
Summary
Hydrogen energy has gradually attracted people’s research interest because it is regarded as a promising high-efficiency clean energy and is widely used in the chemical and petroleum industries, especially in fuel cell power generation [1,2]. Lu et al found that the addition of rare earth element Pr can change the electronic environment around Ni species, weakening the interaction between nickel and Al2 O3 , and strengthening the low-temperature catalytic activity of methanol steam reforming hydrogen production [21]. Compared with the Al2 O3 carrier, the reducible support TiO2 was more widely used in the field of water–gas shift reaction, selective hydrogenation and steam reforming reactions due to the electronic effect and strong interaction between it and the active metal [33,34,35,36]. To the best of our knowledge, there is no report on the electronic effect of Ni/TiO2 catalyst on its initial catalytic performance, as well as the influence of mixed-alcohol feeds with different volume ratios of glycerol and methanol on the reaction (GMSR)
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