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I am trying to create a mapping that will close the current buffer and replaced by the previous buffer.
I tried this
noremap <silent><Leader>bd :<C-6><Bar>bd #<CR>
But will just delete the previous buffer instead closing the current buffer and showing the previous one.
It look like the <C-6> is not working.
<C-6> is a normal mapping (I guess you want to switch to alternate buffer).
But the way you call it is incorrect -- calling it as an ex-command. Normal mode commands in vimscript should be called with :normal! sequenceofkeypresses. For <C-6> it would be :normal ^^ where ^^ is generated by pressing <C-v><C-6>. Even more, with normal you would have issues using <bar> and would have to wrap it into :exe "normal ..." as described in :h :normal.
Having said this, it would be way easier to use b# command to do the same...
nnoremap <silent><Leader>bd :b#<Bar>bd#<CR>
:b# is short for :buffer # -- switch to alternate buffer.
And to answer your direct question you can map it like this:
nnoremap <silent><leader>bd <C-6>:bd #<CR>
Note
nnoremap is used instead of noremap -- map only for normal mode. I doubt you want this mapping to work in insert/select/visual modes. If you do, then you have to change it per mode (they should be slightly different)<C-6> is executed in the same normal mode, so no normal ex command is needed