In:
New Journal of Chemistry, Royal Society of Chemistry (RSC), Vol. 46, No. 47 ( 2022), p. 22672-22685
Abstract:
To deeply understand the role of P in hydrodeoxygenation (HDO), SiO 2 -supported Ni and Ni–P catalysts with different P/Ni ratios ( x ) were prepared. The as-prepared samples were characterized by various characterization methods. The HDO activity and product distribution over the Ni/SiO 2 and N–P/SiO 2 - x were compared and the effects of x on the structure, acidity, formation mechanism of active phases and HDO performance were studied taking m -cresol HDO as a model reaction. The results showed that the introduction of P promotes the formation of smaller active sites and contributes to the creation of weak and medium strength acid sites through the formation of P–OH groups and Ni δ + in Ni 2 P. HDO over the Ni/SiO 2 catalyst occurs mainly via the hydrogenation (HYD) route with 3-methyl-cyclohexanol (3-MCHnol) as the main product. However, for Ni–P/SiO 2 - x catalysts, methyl-cyclohexane (MCH) selectivity increases first and then decreases with the increase of x , reaching a maximum of 95% at x = 1. The acidity generated by the introduction of P contributes to increased MCH selectivity, while the dehydration of 3-MCHnol to MCH occurs mainly on acid sites. However, the excessively high P content ( x ≥ 2.0) leads to a significant increase of MB (toluene) selectivity, which is associated with the increase in Ni( i ) sites. About 100% m -cresol conversion was achieved with Ni–P/SiO 2 -1.0 when the m -cresol (g)/catalyst (g) ratio was 3, with MCH (99.4%) as the major product, showing great promise for deep HDO catalysis.
Type of Medium:
Online Resource
ISSN:
1144-0546
,
1369-9261
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
1472933-7
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