Multi-walled carbon nanotube loaded ruthenium catalyst, and preparation and application thereof

Abstract

The invention relates to a multi-walled carbon nanotube loaded ruthenium catalyst and a preparation method thereof, and an application of the multi-walled carbon nanotube loaded ruthenium catalyst inpreparation of sugar alcohol by catalytic hydrogenation of sugar. According to the invention, a Ru / MWCNTs catalyst with high dispersity is prepared by loading metal ruthenium (Ru) onto multi-walled carbon nanotubes (MWCNTs) through simple liquid-phase reduction and wet impregnation processes. Furthermore, the multi-walled carbon nanotube loaded ruthenium catalyst is applied to a hydrogenation reaction of a series of sugars like xylose, arabinose, glucose, mannose and maltose to respectively prepare functional sugar alcohols like xylitol, arabitol, sorbitol, mannitol and maltitol. The catalystprovided by the invention can realize high-efficiency conversion of a series of sugars and high-selective preparation of sugar alcohols under the conditions of high substrate sugar concentration and small catalyst usage amount; meanwhile, the catalyst has good stability and high repeated use times. In summary, the catalyst provided by the invention has the advantages of simple preparation process,high active metal dispersity, good catalytic activity, applicability to hydrogenation of various sugars, and good versatility.

Description

(1) Technical field [0001] The invention relates to a multi-walled carbon nanotube-loaded ruthenium catalyst, a preparation method thereof and an application thereof in sugar alcohol catalytic hydrogenation preparation. (2) Background technology [0002] Sugar alcohols refer to a class of polyols formed after the aldehyde and ketone carbonyl groups of sugars are reduced to hydroxyl groups. Sugar alcohol has moderate sweetness and low calorific value. It is a green and healthy new sweetener; it has high heat resistance and does not produce Maillard reaction at high temperature, so it can be used as an additive for baked food. The metabolism of sugar alcohols in the body does not affect insulin secretion, does not cause fluctuations in blood sugar, and has the effect of protecting the liver and reducing fat. It can be used as an auxiliary therapeutic agent and special nutritional agent for patients with diabetes; it is not suitable as a nutrition for oral microorganisms Sourc...

AI Technical Summary

Problems solved by technology

However, the nickel-based catalyst selected by this method has the disadvantages of being sensitive to the pH of the solution and being easily deactivated; the activated carbon and oxide carrier used to load the active metal have problems such as uneven pore size distribution and poor mechanical properties, resulting in poor stability of the catalyst. The amount of catalyst used in the hydrogenation process is relatively large, which increases the production cost of sugar alcohols

[0006] To sum up, the current catalysts used in the sugar alcohol production process have problems such as complex preparation methods, high preparation costs, poor stability, and poor versatility.

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