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.
预清洗系统包括清除金属屑及焊渣，它们是磷化和电泳槽内的污染物的来源。
Pre-cleaning should include the removal of metal filings and weld splatter: both are potential sources for dirt in phosphate and electrocoat.
利用程序升温反应法制备了一系列过渡金属碳化物和磷化物，研究它们的晶格热稳定性，考察它们的NO解离和还原反应性能。
A series of transition metal carbides and phosphides were prepared by temperature-programmed reaction method, and their activities for NO dissociation and reduction reactions were investigated.
利用程序升温反应法制备了一系列过渡金属碳化物和磷化物，研究它们的晶格热稳定性，考察它们的NO解离和还原反应性能。
A series of transition metal carbides and phosphides were prepared by temperature-programmed reaction method, and their activities for NO dissociation and reduction reactions were investigated.
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