Study on the Oxidation Kinetics and Microreactivity of Water-Immersed Coal.

ACS Omega · 2020 · PMC7377085 · PMID 32715214

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an increasing trendno p-value reported

As can be seen from Figure 7 a–c, the CO production of the three ranks of coal samples all showed an increasing trend with increasing temperature.

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a decreasing trendno p-value reported

In the oxygen gain stage, the CO production of the water-immersed coal sample for 60 days decreases first and then increases with the temperature. Because in this stage the coal molecules adsorb oxygen and the oxygen molecules on the surface of the coal sample inhibit the escape of CO generated by the reaction, the CO released is less and presents a decreasing trend temporarily.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.