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Preparation method of platinum tin silicon dioxide catalyst for hydrogenation production of ethyl alcohol using acetic acid

A silicon dioxide and catalyst technology, applied in the chemical industry, can solve the problems of harsh reaction conditions, low efficiency of acetic acid production enterprises, low dispersion of active components, etc., achieves good stability, solves overcapacity of acetic acid, high activity and selectivity sexual effect

Active Publication Date: 2016-08-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Preparation method of platinum tin silicon dioxide catalyst for hydrogenation production of ethyl alcohol using acetic acid
  • Preparation method of platinum tin silicon dioxide catalyst for hydrogenation production of ethyl alcohol using acetic acid
  • Preparation method of platinum tin silicon dioxide catalyst for hydrogenation production of ethyl alcohol using acetic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Pt1Sn1 / SiO 2 -1# Catalyst

[0027] 0.393g SnCl 2 Dissolve in 50.2mL of absolute ethanol, add 70.766g of tetraethyl orthosilicate, add dropwise 50.1mL of deionized water while stirring, adjust the pH value of the sol to 3.0, wait for the dropwise addition of water to stand at room temperature until it becomes After gelling, it was aged at 70°C for 10 hours, washed to remove chloride ions, dried in an oven at 110°C for 8 hours, and then baked in a muffle furnace at 500°C for 5 hours to obtain SnO x / SiO 2 Composite carrier, the carrier is fully ground to obtain a powdery solid.

[0028] 4g SnO x / SiO 2 Add the composite carrier powder to the aqueous ammonia solution, add 4mL tetraammonium platinum chloride aqueous solution (0.01gPt / mL) under stirring, continue to stir for 10 hours, add ammonia water dropwise in time to keep the pH=11.0, then filter to wash away the chloride ions, Dry at 200°C for 5 hours. The catalyst powder was pressed into tablets, cru...

Embodiment 2

[0029] Example 2: Pt0.5Sn0.5 / SiO 2 -2# Catalyst

[0030] 0.212g SnCl 2 Dissolve in 30.8mL of absolute ethanol, add 70.766g of tetraethyl orthosilicate, add 30.2mL of deionized water dropwise while stirring, adjust the pH value of the sol to 4.2, wait until the water is added dropwise and let it stand at room temperature until it becomes After gelling, it is aged at 70°C for 10 hours, washed to remove chloride ions, dried in an oven at 95°C for 10 hours, and then baked in a muffle furnace at 600°C for 2 hours to obtain SnO x / SiO 2 Composite carrier, the carrier is fully ground to obtain a powdery solid.

[0031] 4g SnO x / SiO 2 Add the composite carrier powder into the ammonia solution, add 2mL tetraammonium platinum chloride aqueous solution (0.01gPt / mL) while stirring, continue to stir for 24 hours, add ammonia water dropwise in time to keep the pH = 9.0, then filter to wash away the chloride ions, 110 °C for 10 hours. The catalyst powder was pressed into tablets, cru...

Embodiment 3

[0032] Example 3: Pt2Sn1 / SiO 2 -3# Catalyst

[0033] 0.393g SnCl 2 Dissolve in 75.2mL of absolute ethanol, add 70.766g of tetraethyl orthosilicate, add 61.2mL of deionized water dropwise while stirring, adjust the pH value of the sol to 5.0, wait until the water is added dropwise and let it stand at room temperature until it becomes After gelling, it was aged in a water bath at 50°C for 48 hours, washed to remove chloride ions, dried in an oven at 120°C for 5 hours, and then baked in a muffle furnace at 400°C for 10 hours to obtain SnO x / SiO 2 Composite carrier, the carrier is fully ground to obtain a powdery solid.

[0034] 4g SnO x / SiO 2 Add the composite carrier powder into the ammonia solution, add 8mL tetraammonium chloride platinum chloride aqueous solution (0.01gPt / mL) under stirring, continue stirring for 6 hours, add ammonia water dropwise at the right time to keep the pH = 12.0, then filter to wash away the chloride ions, 60 °C for 48 hours. The catalyst pow...

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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...

Claims

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Application Information

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IPC IPC(8): B01J23/62B01J35/02
CPCB01J23/626B01J35/50
Inventor 张剑许国贞赵玉军马新宾王胜平
Owner TIANJIN UNIV
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