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A kind of preparation method of acetic acid hydrogenation ethanol pt-sn/li-al-o catalyst

A catalyst and ethanol production technology, which is applied in the direction of catalyst activation/preparation, organic compound preparation, physical/chemical process catalyst, etc. It can solve the problem of low ethanol conversion rate of acetic acid conversion and achieve low surface acid performance and good stability , the effect of stable surface properties

Active Publication Date: 2019-10-11
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The existing main catalysts for the hydrogenation of acetic acid to ethanol are all kinds of noble metal catalysts, and most of them are based on SiO 2 As a carrier, the conversion rate of acetic acid and the selectivity of ethanol are low. Therefore, the development of a new catalyst for the hydrogenation of acetic acid to ethanol with high stability and long life has important practical significance and industrial application value

Method used

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  • A kind of preparation method of acetic acid hydrogenation ethanol pt-sn/li-al-o catalyst
  • A kind of preparation method of acetic acid hydrogenation ethanol pt-sn/li-al-o catalyst
  • A kind of preparation method of acetic acid hydrogenation ethanol pt-sn/li-al-o catalyst

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Effect test

Embodiment 1

[0027] The specific preparation process of the Pt-Sn / Li-Al-O catalyst in this embodiment is as follows:

[0028] Put 1.36g of lithium nitrate solution in 50mL of deionized water, then add 10g of γ-Al 2 o 3 Stir the powder evenly, impregnate at room temperature for 2 hours, then remove water by rotary evaporation at 60°C, dry at 100°C for 12 hours, and then calcinate at 800°C for 6 hours to obtain the carrier Li 0.5 al 5 o 7.75 , wherein Li / Al=0.10.

[0029]Take 5mL of chloroplatinic acid aqueous solution (0.02gPt / mL) and 0.36g of tin tetrachloride pentahydrate into 45mL of deionized water, then add the prepared carrier into the above solution and stir evenly, and soak at room temperature for 2h, then 60℃ The water was removed by rotary evaporation at a lower temperature, dried at 100° C. for 12 hours, and then calcined at 500° C. for 4 hours to obtain a catalyst powder. The catalyst powder was pressed into tablets, crushed and sieved to obtain 20-40 mesh particles, which ...

Embodiment 2

[0031] The specific preparation process of the Pt-Sn / Li-Al-O catalyst in this embodiment is as follows:

[0032] Put 2.71g of lithium nitrate solution in 50mL of deionized water, then add 10g of γ-Al 2 o 3 Particles (1-2 mm), impregnated at room temperature for 2 hours, then rotary evaporated at 60°C to remove water, dried at 100°C for 12 hours, and then calcined at 800°C for 6 hours to obtain carrier particles LiAl 5 o 8 , wherein Li / Al=0.20.

[0033] Take 5mL of chloroplatinic acid aqueous solution (0.02gPt / mL) and add it to 5mL deionized water, then add 0.36g tin tetrachloride pentahydrate to dissolve it, then add the mixed solution dropwise to the prepared carrier, wait at room temperature Volume impregnation, drying at 60°C for 24 hours, and calcination at 500°C for 4 hours to obtain catalyst particles. Recorded as catalyst 2#.

[0034] NH 3 Temperature programmed desorption (NH 3 -TPD) is an effective method for characterizing the acid strength and acid content of...

Embodiment 3

[0037] The specific preparation process of the Pt-Sn / Li-Al-O catalyst in this embodiment is as follows:

[0038] The lithium nitrate in Example 2 was changed to 4.10g, and other operating modes were unchanged, and the obtained catalyst was recorded as 3#. The carrier of catalyst 3# is LiAl 5 o 8.25 , wherein Li / Al=0.30.

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Abstract

The invention provides a preparation method of an ethanol Pt-Sn / Li-Al-O catalyst through acetic acid hydrogenation and belongs to the technical field of catalyst preparation. The method comprises the steps of (1) immersing Al2O3 into a soluble metal salt solution containing lithium, drying and roasting to obtain a Li-Al-O carrier; and (2) immersing the obtained Li-Al-O carrier into a soluble metal salt solution containing active components Sn and Pt and then drying and roasting to obtain a Pt-Sn / Li-AlO catalyst. The Li-Al-O of a lithium aluminum spinel structure is adopted as the carrier, the surface property of the carrier is stable and the dispersibility of the active components can be improved, thereby improving the activity and the stability of a finished product catalyst. The prepared catalyst has relatively low surface acid property and the selectivity of ethanol can be effectively improved. The method is applied to preparation of the ethanol through acetic acid hydrogenation, so that the acetic acid conversion rate can reach 100% and the ethanol selectivity can reach over 95%. The catalyst prepared through the preparation method has good stability, and the catalyst activity and the ethanol selectivity are basically kept invariable after reaction for 500h.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a preparation method of a Pt-Sn / Li-Al-O catalyst for hydrogenation of acetic acid to ethanol. Background technique [0002] Ethanol is an industrial fermentation product with the largest output and the longest history in industrial production. As an important basic chemical raw material, this product is widely used in chemical industry, military industry, medicine, food and other fields. As a new renewable green energy, fuel ethanol has developed rapidly. Since 2001, the domestic vehicle fuel market has been booming, and the demand for ethanol has been increasing day by day. At present, the domestic demand for industrial ethanol is maintained at about 3 million tons per year, and its annual growth rate is expected to reach about 9%. At present, the production of fuel ethanol in my country mainly relies on grain fermentation and biomass routes. However, due to factor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/62B01J32/00B01J23/04B01J37/02B01J37/08B01J37/18C07C29/149C07C31/08
Inventor 李文龙董玲玉刘亚华李扬王科
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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