The catalytic reduction consists of selective catalytic reduction (SCR) and non selective catalytic reduction (NSCR).

后者又分为选择性催化还原法(SCR)和非选择性催化还原法(NSCR)。

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A high flow rate and pressure of hydrogen was in favor of the catalytic reduction of nitrate, but not benefit for the selectivity.

而对于选择性，前者提高，后者则会导致降低，即控制反应扩散性能有利于提高催化选择性。

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In this paper, the catalytic reduction of nitrate and nitrite were reviewed and the research progress was addressed. Finally, the future research in this field was recommended.

本文结合国内外最新的研究进展，对硝酸盐和亚硝酸盐的催化加氢脱氮进行了综述，并对该领域的研究进行了展望。

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In Europe the trucking industry has settled on a technology called selective catalytic reduction, in which urea is periodically injected into the exhaust system to break down the NOx, converting nitrogen oxides into (somewhat) harmless ammonia.

FORBES: Clearing the Air