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腐殖酸钠改性钙基CO吸收剂在循环煅烧/碳酸化过程中的反应活性改善

Reactivity Improvement of Ca-Based CO Absorbent Modified with Sodium Humate in Cyclic Calcination/Carbonation.

作者信息

Chen Luhan, Sun Zhiguo, Xu Jinqiu, Wang Menglu, Fan Jiaming, Zhang Li

机构信息

School of Environmental and Materials Engineering, Shanghai Polytechnic University, Shanghai 201209, China.

School of Science, Shanghai Polytechnic University, Shanghai 201209, China.

出版信息

ACS Omega. 2020 Apr 6;5(15):8867-8874. doi: 10.1021/acsomega.0c00487. eCollection 2020 Apr 21.

DOI:10.1021/acsomega.0c00487
PMID:32337449
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7178783/
Abstract

The Ca-based sorbent cyclic calcination/carbonation reaction (CCCR) is a high-efficiency technique for capturing CO from combustion processes. The CO capture ability of CaO modified with sodium humate (HA-Na) (HA-Na/CaO) in long-term calcination/carbonation cycles was investigated. The enhancement mechanism of HA-Na on CCCR was proposed and demonstrated. The effects of carbonation temperature, reaction duration, and the addition amount of HA-Na on the carbonation rate of the CaO adsorbent were also studied. HA-Na/CaO is allowed to react 20 min at the optimum conditions for calcination (920 °C, 100% N) and for carbonation (700 °C, 15% CO, 85% N), respectively. HA-Na plays a key role in the CCCR process, and the carbonation conversion rate is lifted obviously. The maximum conversion rate of HA-Na/CaO is 23% higher than that of CaO in the first cycle. After 20 cycles, the conversion rate of HA-Na/CaO is still 0.28, while that of CaO is only 0.15. The carbonation conversion rate for HA-Na/CaO is improved by 86% compared to CaO. In addition, the characteristics of calcined sorbents are analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Brunauer-Emmett-Teller (BET) methods.

摘要

钙基吸附剂循环煅烧/碳酸化反应（CCCR）是一种从燃烧过程中捕集CO的高效技术。研究了用腐殖酸钠（HA-Na）改性的CaO（HA-Na/CaO）在长期煅烧/碳酸化循环中的CO捕集能力。提出并论证了HA-Na对CCCR的增强机理。还研究了碳酸化温度、反应持续时间和HA-Na添加量对CaO吸附剂碳酸化速率的影响。HA-Na/CaO分别在煅烧（920℃，100%N）和碳酸化（700℃，15%CO，85%N）的最佳条件下反应20分钟。HA-Na在CCCR过程中起关键作用，碳酸化转化率明显提高。在第一个循环中，HA-Na/CaO的最大转化率比CaO高23%。经过20个循环后，HA-Na/CaO的转化率仍为0.28，而CaO的转化率仅为0.15。与CaO相比，HA-Na/CaO的碳酸化转化率提高了86%。此外，通过扫描电子显微镜（SEM）、X射线衍射（XRD）和布鲁诺尔-埃米特-泰勒（BET）方法对煅烧后吸附剂的特性进行了分析。

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