**7. Conclusions**

In this paper we summarized olefin isomerization catalysis in five categories, acidic, basic, molecular sieve, transitionmetal catalysis, and photocatalysis, and under each category, we present some typical catalysts that have been studied. The five categroies differentiates most available catalysis systems by their reaction mechanisms, and they also reflect somehow their properties, like acidic catalysis usually have issuses on products selectivity and catalysts recycling. The **Table 3** followed presents all catalysis systems mentioned before, what they are, which category they belong to, applicable reactants and desire products, with their purposes and features, pro and cons, and references of the works.




**Table 3.** *Catalytic system for olefin isomerization.*

## **Acknowledgements**

The work was supported by Beijing Science and Technology Project (code: Z201100008420019), the National natural science foundation of China youth program (NSFC code 21808241) and Fund of the Director of Technical Institute of Physics and Chemistry, Chinese Academy of Sciences. Many thanks are given to our colleagues in the Technical Institute of Physics and Chemistry, CAS, as well as the professionals in other institutes for their great help in the complementary and publication of this work.
