Fellowships for post doc are available for international students at most Israeli universities. You can find quite a few universities that have research centres in chemistry, such as Tel-Aviv University, The Technion and Haifa University. My advice to you is to make sure the universities indeed have researchers that specialize in your research area, so they can assist you in your research.
I've attached a link below to more information on the fellowships. Please let us know if you have any more questions.