Abstract
A series of Ni/KIT6 catalyst precursors with 25 wt.% Ni loading amount were reduced in H2 at 400, 450, 500, and 550 °C, respectively. The studied catalysts were investigated by XRD, Quasi in-situ XPS, BET, TEM, and H2-TPD/Ranalysis methods. It was found that reduction temperature is an important factor affecting the hydrodeoxygenation (HDO) performance of the studied catalysts because of the Strong Metal Support Interaction Effect (SMSI). The reduction temperature influences mainly the content of active components, crystal size, and the abilityfor adsorbing and activating H2. The developed pore structure and large specific surface area of the KIT-6 support favored the Ni dispersion. The RT450 catalyst, which was prepared in H2 atmosphere at 450 °C, has the best HDO performance. Ethyl acetate can be completely transformed and maintain 96.8% ethane selectivity and 3.2% methane selectivity at 300 °C. The calculated apparent activation energies of the prepared catalysts increased in the following order: RT550 > RT400 > RT500 > RT450.
Highlights
With the process of economic globalization, the energy demand is increasing in human society [1].The development of non-renewable energyhasnot fully met the developmentneeds of industry and society [2,3]
RT450 catalyst has the maximum peak area among the studied RTx catalysts. These findings suggest that the RT450 catalyst has the best hydrogen adsorption storage capacity, which can provide more reactive hydrogen species for the HDO reaction
For RT500 catalyst, Sethanol is more than 13% at the initial temperature of 220 C, and the complete
Summary
With the process of economic globalization, the energy demand is increasing in human society [1].The development of non-renewable energyhasnot fully met the developmentneeds of industry and society [2,3]. Finding a reliable alternative energy product is imminent. The use of fed oil to prepare biodiesel is one of the most effective ways to reduce the supply pressure of petrochemical diesel [4]. Fatty acid or ester usually contains rich carbon resources with C12 –C24 bonds [5,6]. The successful transformation of fed oil to biodiesel may effectively mitigate the current tense energy situation. The first-generation biodiesel cannot completely be deoxygenated due to technical limitations. The second-generation biodiesel can be completely deoxygenated because of technical advantages, and the prepared product has excellent performance. The second-generation biodiesel produced by HDO technology is closer to the petrochemical diesel in physical and chemical properties than the first-generation biodiesel
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