Thank you Anam

Yeah I know

as you know this leaching could be happened during the catalyst preparation, using or regeneration section. I would like to find out how they leach to the environment?

Dear Reza Afshar Ghotli many thanks for your interesting technical question. I would not call myself a proven expert in the field of catalysis, but as an inorganic / organometallic chemist I can certainly try to give you some general advice. In general, I would say that you should not worry too much about environmetal issues when using Sn/Pt catalysts. Of course it depends on the amount of catalyst you use (e.g. gram or kilogram amounts) and the question if the catalysts are soluble (homogeneous) or insoluble (heterogeneous). Generally one can say about catalsts that they are use in "catalytic amounts", i.e. small amounts. Thus we are certainly not talking about tons of catalyst, right? Then you should consider if leaching into the environment is at all possible or not. I assume that your reactions are done in closed systems and leaching does not easily take place.

Furthermore, you should take into account that elemental tin and inorganic tin compounds are considered to be of overall low toxicity. For more information about the toxicity of tin and its compounds please have a look at the following article:

Tin, Toxicity

Chapter Tin, Toxicity

This article is freely available as public full text on RG.

For mor infomation about the potential toxicity of platinum and its compounds please go through the follopwing articles:

Toxicity of platinum compounds

Article Toxicity of platinum compounds

and

TOXICITY OF PLATINUM AND PLATINUM COMPOUNDS

https://ipa-news.com/assets/sustainability/IPA_Guidance/Chapter%206_PGM_Guide.pdf

Platinum is not really known as a very toxic heavy metal. Finally, just think about the high price for plantinum compounds! Everyone who bought expensive Pt catalysts will take every precautions not to loose too much into the environment.

Good luck with your research! 👍

Dear Professor Frank

Thanks indeed for your helpful reply.

your time and recommendations are highly appreciated

Regards

Dear Dr. Reza,

The following book might help you with your problem:

Book Platinum Metals in the Environment