Influence of Reduction Temperature on the Structure and Naphthalene Hydrogenation Saturation Performance of Ni2P/Al2O3 Catalysts

Ze Li,Zhi-Qiang Qie,Wen-Ying Li,Jie-Ying Jing

doi:10.3390/cryst12030318

Abstract

Jet fuel rich in hydroaromatics and cycloalkanes could be derived from direct coal liquefaction oil via the hydrogenation saturation process. Developing an efficient catalyst to transform naphthalene hydrocarbons to hydroaromatics and cycloalkanes with high selectivity plays a significant role in realizing the above hydrogenation saturation process. In this work, Ni2P/Al2O3 catalysts were prepared at different reduction temperatures via the thermal decomposition of hypophosphite. We investigated the influence of reduction temperature and the results showed that reduction temperature had an important impact on the properties of Ni2P/Al2O3 catalysts. When the reduction temperature was 400 °C, the Ni2P particle size of the Ni2P/Al2O3 catalyst was 3.8 nm and its specific surface area was 170 m2/g. Furthermore, the Ni2P/Al2O3 catalyst reduced at 400 °C obtained 98% naphthalene conversion and 98% decalin selectivity. The superior catalytic activity was attributed to the smaller Ni2P particle size, higher specific surface area and suitable acidity, which enhanced the adsorption of naphthalene on Ni2P/Al2O3 catalyst.

Highlights

The process of transforming direct coal liquefaction oil into high performance jet fuel has notable features such as low hydrogen consumption, the high added value of the product, and it conforms to our national requirements [1,2,3]
The development of efficient and available hydrogenation catalysts has become urgent in order to realize the process of transforming direct coal liquefaction oil into high-performance jet fuel
The precursor was reduced in an H2 atmosphere at a rate of 2 ◦C min−1 at different reduction temperatures and maintained for 2 h with a H2 flow rate of 100 mL min−1

Summary

Introduction

The process of transforming direct coal liquefaction oil into high performance jet fuel has notable features such as low hydrogen consumption, the high added value of the product, and it conforms to our national requirements [1,2,3]. Naphthalene is a typical aromatic ring compound contained in direct coal liquefaction oil; it is very difficult to realize complete saturation in the hydrogenation process [4]. The traditional transition metal sulfide hydrogenation catalysts perform poorly in the naphthalene hydrogenation process [5,6], and the required reaction conditions are generally harsh, which makes it difficult to meet the actual production requirements. The development of efficient and available hydrogenation catalysts has become urgent in order to realize the process of transforming direct coal liquefaction oil into high-performance jet fuel

Methods

Results

Conclusion