Granulation is an effective method to mitigate the issue of CaO-based sorbent elutriation in the calcium looping process. To further enhance CO₂ capture performance of CaO-based pellets, pore-forming templates are usually added. In this work, rice straw, wheat straw, and corn stalk were adopted as the pore-forming templates. The effect of different regeneration conditions (mild, moderately severe, and severe calcination conditions) on agricultural waste-templated, CaO-based pellets was comparatively investigated. Severe calcination conditions remarkably cause deactivation of the agricultural waste-templated, CaO-based pellets due to the accelerated sintering. Additionally, the existence of alkaline elements within agricultural wastes results in poor CO₂ capture performance for agricultural waste-templated, CaO-based pellets. The pretreatment of water- and acid-washing can remove most of the alkaline elements within raw agricultural wastes. The CaO-based pellets added with 10 wt % of acid-washed rice straw exhibit the highest cumulative CO₂ capture capacity of 2.074 g/g during 15 cycles, which is over 2.3 times that of those pellets added with 10 wt % raw rice straw. Therefore, water-washing and acid-washing are potential approaches to mitigate the adverse effect of alkaline elements within agricultural wastes, which consequently improves the CO₂ capture performance for the agricultural waste-templated, CaO-based pellets.

中文翻译：

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不同再生条件下以农业废弃物为模板的CaO基预洗颗粒对CO ₂捕集性能的比较研究

制粒是缓解钙环化过程中基于CaO的吸附剂淘析问题的有效方法。为了进一步提高基于CaO的颗粒的CO ₂捕获性能，通常会添加成孔模板。在这项工作中，采用稻草，麦秸和玉米秸秆作为成孔模板。比较研究了不同再生条件（轻度，中度重度和重度煅烧条件）对以农业废物为模板的CaO基颗粒的影响。苛刻的煅烧条件由于加速烧结而显着导致以农业废料为模板的CaO基团块的失活。此外，农业废物中碱性元素的存在导致CO ₂含量较低可捕获以农业废物为模板的基于CaO的颗粒的性能。水洗和酸洗的预处理可以去除农业废料中的大多数碱性元素。添加了10 wt％的酸洗稻草的基于CaO的颗粒在15个循环中表现出最高的累计CO ₂捕集能力2.074 g / g，是添加了10 wt％的生稻草的颗粒的2.3倍以上。因此，水洗和酸洗是减轻农业废料中碱性元素的不利影响的潜在方法，从而提高了以农业废料为模板的基于CaO的颗粒的CO ₂捕集性能。