In this work, we prepared porous carbon nanofibers (PCNFs) from commercial herringbone-type carbon nanofibers, and nano-sized transition metals, such as copper, nickel and silver, were loaded on the PCNFs by a metal electroplating in order to prepare novel catalysts for control of toxic gases, such as hydrogen chloride. From experimental results, PCNFs had around 2000 m2/g of a specific surface area, and it decreased slightly after metal loading. In case of metal content, we could control them from less 1 to over 50 wt% by means of plating time and current density inputted. After the metal loading, all samples having transition metal clusters showed higher efficiency of HC1 removal than that of samples without metals. However we also found that some samples having excessive metal content showed a decrease in the efficiency of HC1 removal. This result meant that one of key technologies was both to find optimal metal content and remain high specific surface area of substrates.