This might be due to the sticking of the substrates on the surface, although this might not be significant in the reutilization of the catalyst. 51 The X-ray photoelectron spectrum of regenerated Ni-TPA/ZrO 2 is displayed in Fig. 10 .
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Nickel exchanged supported 12-tungstophosphoric acid: synthesis, characterization and base free one-pot oxidative esterification of aldehyde and alcohol.
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