abababccdedecc: which type of rhyme scheme is it?

When you say "Elizabethan rhyme scheme," you're probably asking about the sonnet rhyme scheme that's usually called "Shakespearean" or "English" -- ABAB CDCD EFEF GG.

There are several different sonnet rhyme scheme that are called "Petrarchan" (check your spelling of that word) or "Italian." The rhyme scheme for the first eight lines of a Petrarchan/Italian sonnet is ABBA ABBA. There are several different traditional rhyme schemes for the final six lines of such a sonnet. (You can web search "Petrarchan sonnet" for more information.)

The rhyme scheme you're asking about doesn't fit either the Shakespearean/English or Petrarchan/Italian pattern. It's perfectly acceptable for a poet to write a sonnet that doesn't use either of those traditional rhyme schemes. There are many different types of sonnets. A non-traditional sonnet rhyme scheme is sometimes called a "nonce" rhyme scheme.