| abstract |
This invention relates to a supported quaternary phosphonium catalyst, preparation thereof and use thereof in producing dialkyl carbonates. The supported quaternary phosphonium catalyst of this invention has the following average molecular structure (I), and is characterized by a relatively high and stable catalyst activity. n n n n n n n n n n wherein, each of X, L, n, R 1 , R 2 , R 3 and n n n n n n n n n n is the same as that in the specification. |