Supported Nickel-Based Catalysts For The Efficient Synthesis Of Aromatic Com- Pounds From Lignin Hydrogenolysis

As high economic valued chemical products, aromatic compounds are applied in various fields. At present, aromatic compounds mainly come from the petrochemical industry, therefore, the use of renewable lignin resource to make aromatic compounds has important significance. Currently, there are two main problems in the process of preparing aro-matic compounds from lignin, one is the selective cleavage of C-O bond; the other is the inhibition of the hydrogenation of aromatic ring. During the refining process of lignin, homogeneous catalyst such as NaOH, sup-ported catalysts such as Mo, Cu, Pt, Rh, Ni are usually used. However, the catalytic activity and selectivity towards C-O cleavage are poor, meanwhile, the hydrogenation performance of these catalysts are gener-ally too strong, thus resulting in virtually no products of aromatic com-pounds. Therefor, how to keep the C-O cleavage at high selectivity while increasing aromatic compounds selectivity become the biggest challenges for us.Since the Ni-based catalysts are inexpensive and simultaneously has a mild reaction condition, we did several researches in improving the aromatic compounds selectivity catalyzed by Ni-based catalysts. This ar-ticle will discuss catalysts with different metal electronic structures con-trolled by several promoters as well as different particle size, the micro-structure of the catalysts are regulated, thereby increasing the aromatic compounds. The contents of this paper are as follows:1. By adding different metal promoters (Zr, Sm, La) to Ni-based cat-alyst or by adjusting the ratio of the active metal with the same promoter, the electronic structure of the center was regulated, taking p-hydroxyphenylacetate model compound, guaiacyl model compound, syringyl type model compound as substrates to study the influence factors of increasing the selectivity of C-O bond cleavage2. By controlling the active metal contents of the precursors, we synthesis a series of Ni-based catalysts with different particle sizes, thus affecting the activity and aromatic compounds selectivity.