Rhodium phosphide catalyst for hydrodesulfurization: Low temperature synthesis by sodium addition

Formation of Rh₂P Supported on Na-form Zeolites and Catalytic Activity for Hydrodesulfurization

“…These results suggest that sodium species weakens the interaction between Al and phosphate 12) . As a consequence, well-dispersed Rh2P can be formed on NaMFI support at low temperature and this catalyst showed higher HDS activity than HMFIsupported catalyst 12) . Zeolite has various types of micropore structures, including one-dimensional (MOR) and three-dimensional (beta and MFI) structures.…”

“…The NaMFI was the same sample as used in our previous study 12) . The order of Al content was as follows; NaMOR NaMFI ≈ NaBEA.…”

“…In the TPR profile of Rh _ P/NaMFI catalyst, the H2 consumption peaks above 180 were assigned to phosphate reduction 12) . These peaks could be divided into two parts; 180-500 (in the case of Rh _ P/ NaMOR catalyst, 200-500 ) and above 500 .…”

“…Therefore, Rh2P formation requires a high reduction temperature due to formation of AlPO4 9) . We recently revealed that the formation temperature of Rh2P on NaMFI zeolite was lower compared with that on HMFI zeolite 12) . These results suggest that sodium species weakens the interaction between Al and phosphate 12) .…”

“…We recently revealed that the formation temperature of Rh2P on NaMFI zeolite was lower compared with that on HMFI zeolite 12) . These results suggest that sodium species weakens the interaction between Al and phosphate 12) . As a consequence, well-dispersed Rh2P can be formed on NaMFI support at low temperature and this catalyst showed higher HDS activity than HMFIsupported catalyst 12) .…”