Carbon Dioxide Assisted Conversion of Hydrolysis Lignin Catalyzed by Nickel Compounds

Abstract

In this work, hydrolysis lignin with nickel compounds deposited on the surface was prepared. The resulting material was introduced into the process of carbon dioxide assisted conversion and the catalytic activity of the deposited nickel compounds in this reaction was evaluated. Use of the obtained catalytic system increases CO2 conversion by more than 30% in the temperature range 450–800 °C. After the conversion process, the material was subjected to a study using a variety of physico-chemical analysis methods (TEM, SEM-EDX, and X-ray phase analysis). Physico-chemical methods of analysis of a sample calcined at 300 °C to decompose nickel nitrate revealed NiO nanoparticles with an average particle size of 16.9 nm.

A Synergistic Effect of Potassium and Transition Metal Compounds on the Catalytic Behaviour of Hydrolysis Lignin in CO2-Assisted Gasification

“…The formation of particles of Ni before heating in CO 2 can be tentatively attributed to the worse affinity of this metal to the surface of the carbon material. A similar situation took place in our previous article [51]. The samples after the catalytic tests exhibit observable particles.…”

CO2-Assisted Sugar Cane Gasification Using Transition Metal Catalysis: An Impact of Metal Loading on the Catalytic Behavior

“…The main efforts in catalytic processes development in the carbon wastes utilisation are focused on the following groups: alkali metals (for example, [ 24 , 25 , 26 , 27 , 28 , 29 ]), alkali–earth metals [ 30 , 31 , 32 ], and transition metals [ 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ]. Different natural and synthetic materials have been tested as carriers for the catalyst for carbon waste utilisation, for example, dolomite [ 44 ], olivine [ 45 , 46 ], or MgO [ 47 ], etc., but the main research is focused on the systems with metals directly deposited on the gasified (or pyrolyzed) material such as rice husk, etc., for example [ 48 , 49 , 50 , 51 ].…”