464 / 2018-09-05 19:06:50

Study on the Reaction Mechanisms of Steam Reforming of Acetic Acid and the Formation Process of Carbon Deposition

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It is one of the commonly used methods to study the reaction mechanism of steam reforming of bio-oil for hydrogen production by model. In this experiment, acetic acid was selected as the model compound, and gas and liquid products were investigated through a series of comparative experiments. Without catalyst, acetic acid occurred to decarboxylation and dehydration to form acetone, CO2 and H2O at first, then acetone was further decomposed to ketene and methane. Due to the instability of ketene, it polymerized to form carbon deposition, accompanied by secondary reactions of steam reforming of methane and water gas shift reaction. Acetone was a very important intermediate product on carbon formation in acetic acid reforming reaction. While the reforming reaction under nickel-based catalyst, [C-C] and [C-H] keys of acetic acid was fast broke to generate a large number of H2, CO, CO2 and CH4, accompanied by secondary reactions of directly decomposition to acetone, CO2 and H2O. With the decomposition and polymerization of acetone, carbon deposition formed gradually covering on the surface of the catalyst leading to catalysts deactivation quickly. The results of gas produced from the reforming reaction under nickel-based catalyst in the later stage were basically consistent with those without catalyst.