KCO has a good catalytic effect in supercritical water gasification (SCWG) of coal. However, researchers have mainly focused on the effects of coal gasification, while the potassium mass transfer process has rarely been studied. Herein, the distribution pattern of potassium during the SCWG of coal and the factors influencing potassium deactivation were experimentally obtained. Through the detection and analysis of the residues after the SCWG of coal, it is found that potassium only exists in the forms of liquid and solid and the potassium in the residue exists in the form of insoluble potassium silica alumina, which does not have a catalytic effect. At a high reaction temperature, the reaction time is longer, and when the silica–aluminum content in coal is higher, the potassium deactivate rate is also higher. The molar contents of potassium and aluminum in the coal gasification residue are linearly correlated, with a ratio of approximately 1:1. Reducing the aluminum content in coal can effectively reduce potassium deactivation. In the SCWG of the Hebi coal, the deactivation rate of potassium reduced from 80.88 % to 17.75 % after acid washing. In the SCWG of the ash-free coal, the carbon gasification efficiency (CE) and potassium content in the liquid were above 95 % after each experiment, there was no deactivation of potassium, and the residual potassium solution remained catalytically effective after the SCWG of the ash-free coal.

中文翻译：

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K2CO3催化剂煤超临界水气化钾失活规律研究


KCO在煤的超临界水气化（SCWG）中具有良好的催化效果。然而，研究人员主要关注煤气化的影响，而对钾传质过程的研究很少。本文通过实验获得了煤超临界水流过程中钾的分布规律以及影响钾失活的因素。通过对煤超临界水处理后残渣的检测分析发现，钾仅以液体和固体形式存在，残渣中的钾以不溶性钾硅铝形式存在，不具有催化作用。影响。反应温度越高，反应时间越长，煤中硅铝含量越高，钾失活率也越高。煤气化渣中钾和铝的摩尔含量呈线性相关，比例约为1:1。降低煤中铝含量可有效减少钾失活。鹤壁煤超临界水流中，酸洗后钾失活率由80.88%降低至17.75%。无灰煤超临界水流中，每次实验后碳气化效率（CE）和液体中钾含量均在95%以上，没有钾失活，残留钾溶液在超临界水流后仍保持催化效果。无灰煤。