Boosting the sintering resistance of platinum–alumina catalyst via a morphology-confined phosphate-doping strategy

Abstract

It is still a great challenge to develop robust sintering-resistant automotive exhaust catalysts due to the harsh working temperature varying from ambient to >1000 °C. Here we report a strategy...

Metal–Support Interactions in Rhodium Catalysts Supported on Tetravalent Metal Pyrophosphates (MP2O7; M = Si, Ti, and Zr)

“…Metal–support interactions have attracted a great deal of attention, not only in terms of being a fundamental subject in catalytic science but also as part of a practical approach for developing industrial catalysts. − Besides the generation of new catalytic functions, the strong acceleration/suppression in catalytic activity, as well as the chemisorption, could be explained by a geometric, chemical, and/or electronic alteration occurring at the metal–support interfaces. In most cases, the specific characteristics of metal oxide supports (e.g., reduction–oxidation and acid–base properties) play vital roles; however, further extension could be achieved by using non-oxide support materials such as phosphates. − In the past decade, we have identified various metal phosphates as ideal support materials for rhodium (Rh) catalysts to produce an optimum anchoring effect that can suppress the extent of the thermal sintering . Generally, Rh anchoring to metal oxide supports (MO x ) occurs via a Rh–O–M interfacial bond under oxidizing conditions, whereas Rh supported on phosphate supports (MPO 4 ) forms a Rh–O–P bonding at the interface since the support surface is mostly terminated by [PO 4 ] units bearing P–OH groups.…”