Will the nickel -based hydrogenation catalysts chlorine poisoning?

Hello everyone, our laboratory uses a nickel hydrogenation catalyst. The carrier is alumina-titanium oxide compound carrier. The C4 distillation division division experiment is performed. You need to use toluene as a solvent to absorb c4 distillation unsaturated hydrocarbons. Now it is found that there is 2.8ppm in toluene.The chlorine content and the experimental effect are not good. The catalyst only adds bifidthne and other bisnexlene, and the monocloniene is basically not moved.I suspect that the catalyst of nickel is afraid of chlorine.My instructor said that the chlorine content of a few PPB can make the nickel catalyst poisoning, but the relevant literature is not found. Is this like this?How much content of chlorine can make nickel catalyst poisoning?