Reduction of catalyst

Before 700°C, as the reduction temperature increased, the intrinsic activity of catalyst Q-01 at atmospheric pressure continued to rise, with the methane conversion rate increasing from around 50% to around 78%. Once the reduction temperature reached 700°C, further increases in this temperature did not result in a significant increase in the methane conversion rate. At a low reduction temperature, the reduction rate of the active components in the catalyst is too low, resulting in low catalytic activity. Increasing the reduction temperature raises the reduction rate of these active components, and nickel metal is well dispersed within the catalyst system, thereby increasing its activity. Further increasing the reduction temperature does not lead to a greater increase in conversion rate, as the active components are already well dispersed. (1) The reduction curve of catalyst Q-01 shows two reduction peaks; the peak temperature of the first reduction peak is between 550–570°C, while that of the second reduction peak is between 780–800°C. The reduction temperature range is 450–900°C. (2) Different reduction atmospheres affect the intrinsic activity of the conversion catalyst. The conversion activity of the catalyst under dry hydrogen atmosphere reduction is higher than that under wet hydrogen reduction. (3) The reduction temperature affects the intrinsic activity of the conversion catalyst. Before 700°C, as the reduction temperature increased, the intrinsic activity of the catalyst at atmospheric pressure continued to rise; once the reduction temperature reached 700°C, further increases in temperature did not result in significant changes in activity.

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