Doncaster potter Keogan was making his first appearance at the ‘Triple Crown’ event, but struggled against two-time World Championship semi-finalist Carter, who was at his fluent best.
Carter opened up with a half-century, then produced a brilliant 100 in the third frame before extending his lead to 4-0 by the mid-session interval.
World No.123 Keogan responded admirably in the fourth – twice Carter missed easy chances and the 24-year-old was on-hand to take advantage, winning on a re-spotted black.
But that was a rare highlight for the tour rookie as his world No.12-ranked opponent compiled a second century of the morning and then wrapped victory up with a fluent 78.
Police incident Woodhouse Sheffield: Two men and a woman injured after large fight breaks out on Market Square
Sheffield fire: Crews tackle blaze in Wharncliffe Woods near Oughtibridge as heatwave continues
Sheffield fire: Video shows firefighters battling blaze at Wharncliffe Woods near Oughtibridge
Sheffield father poured petrol over daughter and tried to set her on fire
Sheffield shooting: Three men charged after man shot in broad daylight in Manor area
“Ali has played really well there, but I had a couple of half chances in the first couple of frames and against the top players you have go to at least make something of them,” Keogan insisted. “If you don’t do it, you don’t experience it, you can’t learn from it.
“Hopefully I am slowly but surely moving in the right direction. Being from Yorkshire, this is one of the main tournaments you look forward to – I just wish I could’ve put a better display on.”
And with the Scottish Open and German Masters qualifiers on the schedule before Christmas, Keogan hopes he can give himself a festive boost.
“The tour is exactly what I expected – tough, relentless. Every game, if you are not on your game then you’re going to lose,” he added.
“Scottish and German are coming up, hopefully I can pick up a couple of wins and have a nice Christmas.”
Follow the UK Championship LIVE on Eurosport with Colin Murray, Jimmy White, Neal Foulds and Ronnie O’Sullivan.