Preparation method of platinum tin silica catalyst for hydrogenation of acetic acid to produce ethanol

Abstract

The invention relates to a preparation method of a platinum tin silicon dioxide catalyst for hydrogenation production of ethyl alcohol using acetic acid. The preparation method comprises the following steps: dissolving tin-containing salt and ethyl orthosilicate in ethyl alcohol and dropwise adding deionized water while stirring, thereby acquiring a SnOx-SiO2 compound oxide; adding an ammonia solution, and then adding a platinammine-containing aqueous solution; grinding the acquired solid into powder and forming, thereby acquiring the platinum tin silicon dioxide catalyst for the hydrogenation production of ethyl alcohol using acetic acid. According to the invention, a sol-gel method and an ion exchange method are combined for modifying the loading mode of Pt and Sn, the dispersity of Pt and Sn and the interaction degree of Pt and Sn are promoted, the PtSn catalyst with excellent performance is acquired and the efficiency of hydrogenation production of ethyl alcohol using acetic acid is increased. Compared with the catalyst used in the existing technique of hydrogenation production of ethyl alcohol using acetic acid, the catalyst provided by the invention can realize high conversion of acetic acid under a mild reaction condition; the conversion rate of acetic acid can reach 99% or more; the selectivity of ethyl alcohol can reach 95%.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, relates to a hydrogenation catalyst, and is a high-efficiency catalyst for the direct hydrogenation of acetic acid to produce ethanol. Background technique [0002] Fuel ethanol was a traditional product on the market in the early 20th century, but it was eliminated due to the large-scale and low-cost development of petroleum. The four major "oil crises" since the mid-1970s have promoted the rapid development of the fuel ethanol industry in many countries in the world. As a new type of clean energy, fuel ethanol has become the focus of renewable energy development in the world today. As countries increase the application of ethanol gasoline, the world's fuel ethanol production is increasing year by year. As a gasoline additive, fuel ethanol can effectively increase the octane number and anti-knock performance of gasoline. As a clean fuel, ethanol has obvious environmental benefits. Et...

AI Technical Summary

Problems solved by technology

At present, the average operating rate of domestic acetic acid plants is less than 60%, and the acetic acid production capacity is relatively surplus, resulting in a continuous decline in the price of acetic acid and low profitability of acetic acid production enterprises. Therefore, it is urgent to develop downstream products of acetic acid and extend the industrial chain of the acetic acid industry.

However, the current PtSn catalysts are mostly prepared by the impregnation method, and the dispersion of the active components of the obtained catalysts is low, and the interaction between the active components and the support is weak, resulting in low catalyst activity and selectivity, poor stability, and poor reaction. more stringent conditions

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