Reduction of aqueous K2MoO4 with aqueous KBH4 at ambient temperatures has been investigated systematically to obtain lower valent molybdenum oxides. Several lower valent oxides such as MoO2, Mo4O11, K0.26MoO3 (red bronze), K0.30MoO3 (blue bronze), and K0.85Mo6O17 are formed during the reduction process; however, only MoO2 has been obtained as single-phase product. The nature of the product formed is strongly influenced by the reducing power of KBH4. The reducing power increases with decreasing pH or increasing concentration and volume of KBH4. The as-prepared samples are amorphous as revealed by X-ray diffraction and transmission electron microscopy. They crystallize sharply at around 350-500 degrees C as revealed by differential scanning calorimetry. Since the products formed are amorphous in nature, they may become particularly attractive for battery electrodes and catalysis.