In this paper, we investigate certain deformations Bq(g) of the negative part of quantized enveloping algebras Uq(g). An algorithm is established to determine when a given Bq(g) is a PBW-deformation of . For g of type A2 and B2, we classify PBW-deformations of . Moreover, we explicitly construct some PBW bases for a class of PBW-deformations Bq(g) of . As an application, Iorgov–Klimyk's PBW bases for the non-standard quantum deformation of the universal enveloping algebra U(so(n,C)) are recovered.
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