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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Experimental evaluation of Mg-and Ca-based synthetic sorbents for CO2 capture
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Experimental evaluation of Mg-and Ca-based synthetic sorbents for CO2 capture

机译：实验评价mg和总部合成吸附二氧化碳捕获

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摘要

Hydrogen with high purity can be directly derived from fossil and renewable energy sources, like natural gas, coal and biomass, by the so-called sorption-enhanced reforming (SER) and water gas shift (SEWGS) processes characterized by simultaneous CO2 capture. This paper deals with CO2 capture on a solid sorbent under cyclic (carbonation/decarbonation), industrially relevant conditions. Hydrotalcite-like compounds (double Mg/Al hydroxy-carbonates), in comparison to CaO-based sorbents, are characterized by a comparatively smaller energy demand for regeneration and the operating temperature range is much lower (200-400 °C), making them particularly attractive for SEWGS processes. Different kinds of hydrotalcite were prepared and the Mg~(2+)/Al(3+) ratio, the effect of a promoter addition and the substitution of the bivalent cation (Ca instead of Mg) were investigated, with commercial and laboratory synthesized samples. Original and heat-treated hydrotalcite samples were characterized by XRD, BET and SEM-EDX in order to detect composition, crystalline phases and morphology. Sorption capacity was investigated under cyclic conditions by means of TGA-DSC. Step-response experiments were performed in a micro-reactor to evaluate the kinetic behavior, and a first-order-with-dead-time model for gas mixing was used to fit the results and work out the CO2 dynamic load on the solid phase.
机译：高纯度氢气可以直接导出从化石能源和可再生能源,如天然气、煤和生物质,通过所谓的sorption-enhanced改革(SER)和水的气体转变(SEWGS)过程的特征同时二氧化碳捕获。二氧化碳捕获循环下固体吸附剂(碳酸/脱二氧化碳),工业相关条件。(双毫克/ Al hydroxy-carbonates)比较CaO-based吸附剂,具有相对较小的能源需求再生和操作温度范围低得多(200 - 400°C),使它们吗为SEWGS过程特别有吸引力。不同种类的水滑石,就做好了准备毫克~ (2 +)/ Al(3 +)比的影响启动子的替换二价阳离子(Ca代替毫克)调查,商业和实验室合成样品。水滑石样品通过XRD,赌注,SEM-EDX为了检测成分,水晶阶段和形态。能力在循环条件下进行了研究通过TGA-DSC。在微反应进行评价动力学行为,first-order-with-dead-time模型气体混合将结果和拟解决二氧化碳动态固相上的负载。

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