Effects of Alkali Metals on Nickel/Alumina Catalyzed Ethanol Dry Reforming

Se-Won Park,Dongseok Lee,Iljeong Heo,Young Jin Kim,Jin Hee Lee,Seung-Ik Kim,Ji Hoon Park,Tae Sun Chang

doi:10.3390/catal11020260

Se-Won Park, Dongseok Lee + Show 6 more

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https://doi.org/10.3390/catal11020260

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Abstract

Although ethanol dry reforming is an attractive carbon utilization technology, problems of severe coke formation and low catalytic activity should be solved for realization of the technology. We demonstrate the effects of alkali metal additives (lithium, sodium, and potassium) on nickel catalyzed ethanol dry reforming. Potassium doped nickel catalyst (Ni/K2O-Al2O3) showed enhanced catalytic activity and durability in ethanol dry reforming. Thermogravimetric analysis (TGA) showed that Ni/K2O-Al2O3 had a high resistance to coke formation. The amounts of coke formed on Ni/K2O-Al2O3 were 1/3 lower than the amounts of coke formed on Ni/Al2O3. The total coke quantities were closely correlated to the number of basic sites of the nickel catalysts. Raman spectroscopy and transmission electron microscopy analyses revealed that the alkali metals control the coke formation on the catalysts.

Highlights

Ethanol dry reforming is an attractive carbon utilization technology, problems of severe coke formation and low catalytic activity should be solved for realization of the technology
Ethanol Dry Reforming Catalyzed by Ni/Al2 O3
The catalytic activity of Ni/Al2 O3 on ethanol dry reforming was tested under a flow of 1:1 mixture of ethanol and carbon dioxide at 700 ◦ C (Figure 1)

Summary

Introduction

Ethanol dry reforming is an attractive carbon utilization technology, problems of severe coke formation and low catalytic activity should be solved for realization of the technology. We demonstrate the effects of alkali metal additives (lithium, sodium, and potassium) on nickel catalyzed ethanol dry reforming. Potassium doped nickel catalyst (Ni/K2 O-Al2 O3 ) showed enhanced catalytic activity and durability in ethanol dry reforming. Raman spectroscopy and transmission electron microscopy analyses revealed that the alkali metals control the coke formation on the catalysts. Carbon dioxide especially is the main GHG, accounting for 88% of global warming [1,2,3,4]. As one type of CCU technology, methane dry reforming has been widely studied due to its high carbon dioxide conversion and production of a useful gas mixture, synthesis gas (Equation (1)). Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations

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