Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 604, Issue -, Pages 727-736Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.07.039
Keywords
Nickel; High dispersion; SAPO-5; EDTA ligand; Hydroisomerization
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Funding
- National Natural Science Foundation of China [21978326, 21991090, 21991091]
- Natural Science Foundation of Shandong Province [ZR2019MB029]
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A nickel-based bifunctional catalyst was developed with enhanced hydroisomerization performance using an in-situ solid synthesis method. By controlling the EDTA/Ni2+ ratio, highly dispersed Ni nanoparticles were achieved on SAPO-5, leading to improved performance in n-hexane hydroisomerization. These results provide a facile approach for the preparation of highly dispersed non-noble metal based bifunctional catalysts at a high loading.
The nickel based bifunctional catalyst with enhanced hydroisomerization performance was developed using an in-situ solid synthesis method. It was achieved to stabilize smaller Ni active sites on SAPO-5 using ethylenediaminetetraacetic acid (EDTA) ligands. The role of EDTA ligands was clarified by controlling the molar ratio of EDTA to Ni2+ (EDTA/Ni2+) over Ni/SAPO-5 catalysts. EDTA ligands inhibited the formation of nickel aluminate spinel and aggregation of NiO species during calcination, which dispersed Ni nanoparticles in a mean size of 4.7 nm on SAPO-5. The size of Ni nanoparticles could be controlled by regulating EDTA/Ni2+ ratio in [Ni-EDTA](2-)complex. The prepared catalyst exhibited high yield of isomers (54.0%) and di-branched isomers selectivity (18.0%) in the n-hexane hydroisomerization, which was approximately 2 times higher than that of the Ni/SAPO-5 catalyst without EDTA ligands at similar conversion. These results are important to propose a facile approach for the preparation of highly dispersed non-noble metal based bifunctional catalysts at a high loading. (C) 2021 Published by Elsevier Inc.
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