Malkia Strikers started the second set brightly with Chepchumba terrorising the Belgians with powerful hits as Kenya enjoyed a 8-5 lead at the first time out.
However, poor service from the Kenyan side benefited their opponents who levelled and surged ahead to win the set with a gap of 11 points.
As in the second set, Kenya took over the leadership but poor coordination meant it was another tough task for Moura and his charges as they tried to contain the marauding Belgians who had won their opening match against Puerto Rico 3-0 (25-15, 27-25, 25-15).
Belgium had 39 attacks compared to Kenya's 26. The winners were superior in all departments after making six blocks against Malkia Striker's four.
Chepchumba and Noel Murambi had 13 and five points respectively. Herbots Britta and Van Gestelre bagged 16 and 12 points for the Belgians.
Meanwhile, Tokyo Olympics and Volleyball Nations League silver medallists Brazil dropped a set, but still had a successful start to their campaign in the 2022 FIVB Volleyball Women's World Championship on Saturday as the South Americans topped the Czech Republic in their first match at the GelreDome, in Arnhem.
The Brazilians ended the second day of competition with a 3-1 (25-20, 25-15, 22-25, 25-18) victory over the Czechs to get a head start in Pool D.