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Preparation of Modified Nano-Scale CaO Particles and Evaluation as a CO2 Adsorbent at High Temperatures in Hydrogen Producing Process

Author: WuZuo
Tutor: WuSuFang
School: Zhejiang University
Course: Chemical Engineering
Keywords: Nano calcium oxide Package silicon processing Decomposition temperature High-temperature adsorption Adsorption capacity Cycle stability Doping modification
CLC: TQ424.1
Type: Master's thesis
Year: 2006
Downloads: 470
Quote: 4
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Abstract


Hydrogen is not only used as raw materials of petrochemical and chemical industry, and is an excellent energy carrier, used as a clean fuel and transport of power and energy. Hydrogen production method of carbon dioxide adsorption enhanced methane steam reforming reaction become the recent research focus simple process to further reduce energy consumption. The carbon adsorbent performance is key to the hydrogen production feasibility of new technology applications. The purpose of this paper is to develop the nanometer calcium oxide high-temperature CO 2 the adsorbent and performance evaluation strengthen methane steam reforming for hydrogen production process feasibility study provides a basis for adsorption. Focus on nano calcium carbonate precursor, the sol-gel method on its surface the coated SiO 2 modified package prepared by high-temperature calcination surface silicon modified nano calcium oxide high temperature CO < sub> 2 of adsorbent samples. Samples having a diameter of the high temperature of the sample before and after the package silicone modified CO 2 adsorption rate and adsorption, desorption cycle experiment characteristics were tested in a Φ12mm the fixed bed adsorption Evaluation apparatus. Adsorbent preparation and the adsorption performance evaluation results show that: the structure of nano calcium carbonate coated with a layer of amorphous SiO 2 , the surface of the Si: Ca ratio of 1:39. Package silicon nano calcium carbonate initial decomposition temperature of 595 ~ 620 ℃, complete decomposition temperature of 800 to 820 ° C, package silicon nano calcium carbonate was decomposed into CaO nano at a temperature of 600 ° C, gas flow rate of 30 ~ 40ml/min under the conditions of maximum adsorption capacity, adsorption rate of 92.1%, the with uncoated silicon nano calcium carbonate samples compared to CO 2 adsorption capacity increased by 10%. 20 times of adsorption and desorption cycle adsorption capacity was measured the experiment: the CO 2 adsorption rate stable at 64.2%. XRD analysis of 20 CO 2 adsorption, desorption calcium carbonate polymorphs remained stable. Were prepared by mechanical mixing the two doping modification nano-calcium oxide high-temperature CO 2 adsorbent, the two adsorbents of the adsorption capacity and the cycle adsorption performance, and with the surface-coated silicon The modified adsorbents adsorption performance comparison. The results show that the use the nanometer SiO 2 doped modified adsorbent was 83.8%, 30 ~ 40ml/min: 600 ℃ temperature, gas flow rate; NaY zeolite doped modified adsorption adsorbed was 86.4%. And package silicon modified sorbent maximum adsorption rate of 92.1 percent compared to the somewhat less certain. 20 adsorption, desorption cycle experiment Houna Mi SiO 2 doped modified adsorbent rate was 57.4%; NaY zeolite doped modified adsorbent was 62.8%. The results show that: with a surface coating and modified by doped nano calcium oxide based sorbents, than the unmodified nano calcium oxide based sorbents and better adsorption cycle stability. Adsorbent doped obtained adsorption stability slightly worse. The findings provide an important basis for further research.

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CLC: > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Adsorbent > Activated carbon
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