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A nano-metal and catalyst technology, which is applied in the field of metal catalyst preparation, can solve the problems of low economic benefit value and waste, and achieve the best reaction activity, improved activity, and good methanol selectivity.
Inactive Publication Date: 2015-09-30
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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However, there are many by-products of xylose and furfural produced by hydrolysis of rice husk, and the economic benefit value is low; if rice husk is used as a silicon source alone, the carbon element contained in rice husk and a small amount of metals such as K and Na are seriously wasted; rice husk power generation is also Only the carbon in the rice husk is used
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[0016] The present invention will be described in detail below in conjunction with examples.
[0017] 1. Highly active metal Cu / Zn-SiO 2 Catalyst preparation method: using the impregnation method, a certain quality of Cu(NO 3 ) 2 ·3H 2 O (≥99%) and Zn(NO 3 ) 2 ·6H 2 O (≥99%) was dissolved in deionized water and then impregnated in the pores of a certain mass of rice husk. Wherein the molar ratio of Cu / Zn is 1 / 5-5 / 1, and the mass of Cu and Zn accounts for 5%-50% of the total mass of the catalyst. Dry the dried precursor in an oven at 120°C for 10 hours, then bake it at 150-400°C for 3-5 hours in an inert atmosphere (nitrogen, argon or helium, any one or a mixture of any proportion), the resulting Prepared Cu / Zn=1, Cu / ZnO-SiO with a mass fraction of 10% 2 Catalyst and catalyst C prepared by impregnation method IM-623-Reduction The catalyst characterization parameters and low-temperature methanol synthesis reactivity are shown in Table 1. where C 250 , C 300 and C...
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Abstract
The invention discloses a method for preparing a nano metal catalyst, and relates to a catalyst preparation method. The method fully utilizes the elements such as silicon, carbon and trace metals contained in rice husks, uses SiO2 generated after calcinating a silicon source in the rick husks as a carrier of the catalyst, and uses organic matters and a carbon source as a reducing agent during the calcination of the catalyst. Under the condition of low temperature calcination, metal oxides can be reduced to a metal Cu simple substance through the reducing agent without additional reducing processes, so that energy is reduced; the trace element K contained in the rice husks is used as an auxiliary of the catalyst, so that the activity of the catalyst is remarkably improved; when being used in the low temperature methanol synthesis reaction, the catalyst shows good reaction activity and selectivity of methanol. According to the invention, the nano metal catalyst is a reduced state metal Cu-based catalyst, and no additional reducing process is required; the prepared catalyst shows relatively high Cu metal dispersion degree and relatively small metal Cu particles.
Description
technical field [0001] The invention relates to a preparation method of a metal catalyst, in particular to a preparation method of a nanometer metal catalyst. Background technique [0002] Metal catalysts are the earliest, deepest, and most widely used catalysts among solid catalysts. It is the most important class of catalysts in industrial catalysis. Classified according to their functions, metal catalysts can play the roles of hydrogenation, dehydrogenation, oxidation, isomerization, cyclization, etc. Classified by price, metal catalysts include base metal catalysts, such as: Ni, Cu, Co, Fe, etc.; and noble metal catalysts, such as: Pt, Pd, Ru, Rh, etc. At present, the preparation methods of nano-metal catalysts mainly include chemical methods and physical methods. Among them, chemical methods mainly include impregnation method, co-precipitation method, homogeneous deposition method, sol-gel method and microemulsion method; physical methods include vapor phase depo...
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