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Cement clinker precursor production in an electrolyser
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2022-10-21 , DOI: 10.1039/d2ee02349k
Zishuai Zhang 1 , Benjamin A. W. Mowbray 1 , Colin T. E. Parkyn 1 , Chris T. E. Waizenegger 1 , Aubry S. R. Williams 1 , Eric W. Lees 2 , Shaoxuan Ren 1 , Yongwook Kim 1 , Ryan P. Jansonius 1 , Curtis P. Berlinguette 1, 2, 3, 4
Affiliation  

The manufacture of cement is the single largest industrial source of CO2(g) emissions into the atmosphere. We report here an electrochemical flow reactor (electrolyser) that continuously converts limestone (CaCO3(s)) into Ca(OH)2(s) at a high rate of product formation (486 mg h−1 at 100 mA cm−2). The Ca(OH)2(s) product (slaked lime) is a chemical precursor to cement clinker, the main component of Portland cement, and other cement varieties. This three-compartment electrolyser operates with ∼100% current efficiency at a cell voltage of 2.9 V and generates pure O2(g), H2(g), and CO2(g) streams that can be utilized downstream without purification. To demonstrate this feature, we feed the CO2(g) released from limestone directly to a second electrolyser that valorizes CO2(g) into higher value carbon-containing products (e.g., CO). A preliminary life-cycle analysis indicates that the proposed electrochemical process can decrease the amount of CO2 emitted per tonne of cement by 75% and achieve cost-parity with incumbent cement manufacturing processes.

中文翻译:

在电解槽中生产水泥熟料前体

水泥制造是向大气排放CO 2(g)的最大工业来源。我们在此报告了一种电化学流动反应器(电解槽),该反应器以高产物形成率(在 100 mA cm -2时为 486 mg h -1 )连续地将石灰石 (CaCO 3(s) ) 转化为 Ca(OH) 2(s ) . Ca(OH) 2(s)产品(熟石灰)是水泥熟料(波特兰水泥的主要成分)和其他水泥品种的化学前体。这种三室电解槽在 2.9 V 的电池电压下以约 100% 的电流效率运行,并产生纯 O 2(g)、H 2(g)和 CO 2(g)无需纯化即可在下游使用的物流。为了证明这一特性,我们将石灰石释放的 CO 2(g)直接送入第二个电解槽,将 CO 2(g)转化为更高价值的含碳产品(例如CO)。初步的生命周期分析表明,所提出的电化学工艺可以将每吨水泥排放的 CO 2量减少 75%,并实现与现有水泥制造工艺的成本平价。
更新日期:2022-10-21
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