介绍了防氮化剂主要用于金属材料氮化时非氮化部位的防护。

Anti-nitridizing agent is mainly used to protect non-nitridizing area during metal nitridizing process.

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结果表明，保护床催化剂失活的主要原因是原料中的有机碱性氮化物引起的树脂催化剂交换容量的损失。

It was found that loss of exchange capacity of the resin catalyst caused by basic nitrates was the main cause behind the deactivation.

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着重概述了传统金属硫化物催化剂的改性方法，新型的金属碳化物、金属氮化物和金属磷化物催化剂的研究现状。

Improvement and modification of traditional metal sulphide catalysts, and the current situation of new catalysts such as metal carbides, metal nitrides and metal phosphides are emphasized.

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