Applied Energy:赤泥修饰Ca-Al-Ce双功能材料强化生物质水蒸气气化制氢

Highlights

• Red mud-doped Ca-Al-Ce material is proposed to use in steam gasification of biomass.

• Red mud-doped Ca-Al-Ce material improves H₂ production in biomass gasification.

• H₂ concentration using red mud-doped Ca-Al-Ce material reaches69.1% after 10 cycles.

• Red mud-doped Ca-Al-Ce material enhances tar cracking during cycles.

• Ca₂Fe₂O₅ generated from red mud and CaOimproves oxygen vacancy.

摘要

采用工业固废—赤泥作为Fe前驱体，合成赤泥修饰Ca-Al-Ce双功能材料，提高Ca-Al-Ce材料在生物质气化制氢中的催化焦油裂解性能。本文研究了赤泥修饰Ca-Al-Ce双功能材料在吸收强化生物质水蒸气气化过程中的强化制氢、脱碳与催化焦油裂解性能，分析了其在多次循环中物相组成、电子特性、表面及微观结构的演变，阐明了赤泥修饰对双功能材料捕集CO2与催化焦油裂解的影响机理。发现赤泥的最佳添加量为5wt%，20次循环后H2浓度可达65.1vol%，比未修饰材料提高了82.4%。此外，20次循环后，赤泥修饰使甘蔗渣气化的焦油、残碳、CO2浓度分别减少了25.2%、8.6%、52.2%。首次循环时赤泥中Fe2O3与CaO通过高温固相反应生成Ca2Fe2O5，促使材料产生了氧空位。赤泥修饰Ca-Al-Ce双功能材料中Fe组分的氧化程度随循环次数增加而提高，更有助于生物质水气变换、焦油裂解等反应的进行。赤泥修饰对于促进制氢、捕集CO2和焦油裂解有关键影响。因此，赤泥修饰Ca-Al-Ce双功能材料用于吸收强化生物质水蒸气气化制氢技术具有很好的前景。

更多关于“H₂ production"的研究详见：

https://www.sciencedirect.com/search?qs=H2%20production&pub=Applied%20Energy&cid=271429

Abstract

The sorption-enhanced steam gasification of biomass (SESGB) using CaO-based materials is considered as a promising method for H2 production. Ca-Al-Ce material has been reported as a good bi-functional material in SESGB process. Red mud is a solid waste in aluminium industry with large yield, which is rich in Fe2O3. In this work, a red mud-doped Ca-Al-Ce bi-functional material was prepared by wet-mechanical mixing method for H2 production from SESGB. The CO2 capture, H2 production, and tar reduction performances during SESGB process using the red mud-doped Ca-Al-Ce bi-functional material were studied. The results show that the optimum addition amount of red mud in the bi-functional material is 5 wt%. After 20 SESGB cycles, the H2 concentration using the red mud-doped Ca-Al-Ce material achieves 65.1 vol%, which is 82.4% higher than that using Ca-Al-Ce material. Besides, with the addition of red mud in the bi-functional material, the tar, residue char yields and CO2 concentration decrease by 25.2%, 8.6% and 52.2%, respectively. Fe2O3 in the red mud reacts with CaO to form Ca2Fe2O5 in the 1st cycle, and Ca2Fe2O5 is stable during 20 cycles, which is beneficial for the generation of oxygen vacancy. The oxidation states of Fe species in the material increase with the number of SESGB cycles, thus the catalytic effects on water gas shift reaction and tar reduction are promoted. The red mud addition is the key factor that results in high H2 production, CO2 capture and tar reduction performances, so the red mud-doped Ca-Al-Ce material appears promising for SESGB.

Keywords

Sorption-enhanced steam gasification of biomass; 

CaO-based material; 

Red mud; 

H2 production; 

CO2 capture

Fig. 5. Syngas compositions from SESGB cycle susing RM-doped Ca-Al-Ce material: (a) H₂; (b) CO₂; (c)CO; (d) CH₄.

Fig. 9. EPR spectra of RM₅-Ca₇₅Al₁₀Ce₁₅and Ca₇₅Al₁₀Ce₁₅ during SESGB cycles.

Fig. 10. XPSspectra of O 1s for RM₅-Ca₇₅Al₁₀Ce₁₅and Ca₇₅Al₁₀Ce₁₅ after 10 SESGB cycles.

关于Applied Energy

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