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Cerium modified calcium-based bifunctional particle, and preparation method and application thereof

A dual-function, calcium-based technology, applied in chemical instruments and methods, other chemical processes, physical/chemical process catalysts, etc., to achieve the effect of increasing adsorption capacity and maximum adsorption capacity

Inactive Publication Date: 2014-01-22
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] Gaowei Wu, Chengxi Zhang, Jinlong Gong, et al. Sorption enhanced steam reforming of ethanol on Ni-CaO-Al 2 o 3 multifunctional catalysts derived from hydrotalcite-like compounds[J].Energy Environ.Sci.2012,5(10),8942-8949, the literature introduces Ni-CaO-Al 2 o 3 Preparation of composite catalysts, with experimental analysis for different Ca-Al ratios, but also no experiments using metal modification

Method used

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  • Cerium modified calcium-based bifunctional particle, and preparation method and application thereof
  • Cerium modified calcium-based bifunctional particle, and preparation method and application thereof
  • Cerium modified calcium-based bifunctional particle, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Implementation example 1: 5%CeO 2 Calcium-based bifunctional particles

[0057] Weigh 9.42g of calcium acetate, 0.3784g of cerium nitrate hexahydrate, 2.2294g of nickel nitrate hexahydrate and 5.62g of citric acid, add distilled water and stir to dissolve completely, keep stirring and drying the solution at 80°C, and then calcined at 950°C After 3 hours, it was crushed to obtain 24-65 mesh cerium-modified calcium-based bifunctional particles, and its CeO 2 The mass ratio of Ni to CaO is 0.05:1, and the mass ratio of Ni to CaO is 0.15:1. For the actual preparation, see Figure 5 . In the hydrogen production reaction of adsorption-enhanced ethanol steam reforming, 1.24g of this bifunctional particle is used as a catalyst, and the space velocity of ethanol is 22h -1 , the water-to-carbon ratio is 3:1, the reaction pressure is 0.1MPa, the pre-reduction temperature is 700°C, the reaction temperature is 500°C, the outlet hydrogen concentration is 95%, CO 2 The effective a...

Embodiment 2

[0058] Implementation example 2: 7%CeO 2 Calcium-based bifunctional particles

[0059] Weigh 9.42g of calcium acetate, 0.5298g of cerium nitrate hexahydrate, 1.4863g of nickel nitrate hexahydrate and 5.62g of citric acid, add distilled water and stir to dissolve completely, keep stirring and drying the solution at 80°C, and then calcined at 700°C After 5h, it was crushed to obtain 24-65 mesh cerium-modified calcium-based bifunctional particles, and its CeO 2 The mass ratio of Ni to CaO is 0.07:1, and the mass ratio of Ni to CaO is 0.1:1. In the hydrogen production reaction of adsorption-enhanced ethanol steam reforming, 1.2 g of this bifunctional particle is used as a catalyst, such as figure 2 Shown, the space velocity of ethanol is 22h -1 , the water-carbon ratio is 3:1, the reaction pressure is 0.1MPa, the pre-reduction temperature is 700°C, the reaction temperature is 600°C, the outlet hydrogen concentration is 97%, CO 2 The effective adsorption time is 40min.

Embodiment 3

[0060] Implementation example 3: 3%CeO 2 Calcium-based bifunctional particles

[0061] Weigh 9.42g of calcium acetate, 0.2271g of cerium nitrate hexahydrate, 2.9725g of nickel nitrate hexahydrate and 33.72g of citric acid, add distilled water and stir to dissolve completely, keep stirring and drying the solution at 80°C, and then calcined at 950°C After 3 hours, it was crushed to obtain 24-65 mesh cerium-modified calcium-based bifunctional particles, and its CeO 2 The mass ratio of Ni to CaO is 0.03:1, and the mass ratio of Ni to CaO is 0.2:1. In the adsorption-enhanced ethanol steam reforming hydrogen production reaction, 1.28g of this bifunctional particle is used as a catalyst, and the space velocity of ethanol is 22h -1 , the water-carbon ratio is 3:1, the reaction pressure is 0.1MPa, the pre-reduction temperature is 700°C, the reaction temperature is 500°C, the outlet hydrogen concentration is 96%, CO 2 The effective adsorption time is 50min.

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Abstract

The invention discloses a cerium modified calcium-based bifunctional particle and a preparation method. The calcium-based bifunctional particle comprises CeO2, CaO and NiO, wherein a mass ratio of CeO2 to CaO is 0.03-0.07: 1, and a mass ratio of Ni to CaO is 0.1-0.2: 1. The calcium-based bifunctional particle is prepared by dissolving calcium acetate, cerium nitrate hexahydrate, nickel nitrate hexahydrate and citric acid, then carrying out drying and calcining and finally carrying out mechanical crushing and sieving. According to the invention, calcium acetate is used as a precursor of CaO and can be dissolved in deionized water, which is beneficial for full mixing of calcium acetate, cerium nitrate, nickel nitrate and citric acid, and thus, a variety of substances in the prepared bifunctional particle are uniformly distributed; through addition of citric acid in an aqueous solution, complexation of ions like Ca<2+> is facilitated, and formation of tiny channels in the particle is promoted in the process of calcining, which is favorable for improving carbon dioxide adsorption by CaO; and according to results of experimental study, doping of Ce (5w%) for modification is more beneficial for improving maximum carbon dioxide adsorption compared with doping of Y(5w%) and Zr(5w%).

Description

technical field [0001] The invention relates to a preparation method and application of cerium-modified calcium-based bifunctional particles, belonging to the technical fields of chemical industry and energy. Background technique [0002] With the development and utilization of hydrogen energy, the source of hydrogen energy is becoming more and more important, and hydrogen production technology occupies an extremely important position in the entire hydrogen energy system. Natural gas steam reforming (Steam Methane Reforming: SMR) is one of the most mature hydrogen production technologies at present, providing most of the hydrogen used in the world, and the main reactions are as follows: [0003] Reformation reaction: CH 4 (g)+H 2 O(g)=CO(g)+3H 2 (g) [0004] Water vapor shift: CO (g) + H 2 O(g)=CO 2 (g)+H 2 (g) [0005] Referring to the above reaction equation, according to the principle of chemical reaction equilibrium shift, if the CO produced in the reaction can b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30C01B3/32B01J23/83
Inventor 王文举邢兵
Owner NANJING UNIV OF SCI & TECH
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