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Steam reforming of bioethanol is a potential reaction for H 2  production. The development of active Ni catalysts with sintering resistance, coking resistance and thermal stability is indispensable for practical application. In this study, the encapsulation structure of Ni nanoparticles inside Silicalite-1 was proposed as a catalyst (Ni@Silicalite-1). The catalyst was prepared by hydrothermal synthesis using Ni-phyllosilicate as a Ni precursor. An investigation of catalytic activity was conducted at 500–800 °C, along with an investigation of catalyst properties, including surface morphology, Ni properties, and coke formation on the spent catalysts, compared to a conventional Ni/Silicalite-1. Ni@Silicalite-1 exhibits a higher ethanol conversion, hydrogen production, and selectivity towards C1 products. Especially in a kinetic control condition (500–600 °C), Ni@Silicalite-1 exhibits 46.8% in ethanol conversion at 500 °C and two times higher in C2-to-C1 conversion at 600 °C than that of Ni/Silicalite-1. Moreover, a significant coke suppression of 2–5 times reduction form that of impregnation catalyst is obtained for Ni@Silicalite-1 in various reaction temperatures. It also shows a sintering resistance as maintaining the Ni size at 4.0–4.1 nm after ESR at high temperature (800 °C 4 h). Therefore, the encapsulation structure of ultrafine Ni nanoparticles inside Silicalite-1 is promising for bioethanol steam reforming.

journal of chemical engineering of japan

Development of Ni Nanoparticle Encapsulated with Silicalite-1 Catalyst for High Activity Steam Reforming of Bioethanol with High Sintering Resistance and Coke Suppression