Quick X-ray Absorption Fine Structure Studies on the Activation Process of Ni2P Supported on K-USY
Source abstract
Abstract
Ni 2 P/K-USY (K-promoted ultrastable Y-type zeolite) is an efficient catalyst for hydrotreatment of petroleum feedstocks. The structural changes of the passivated catalyst during activation were followed by quick XAFS (X-ray absorption fine structure) with online gas analysis. Activation was conducted by temperature-programmed reduction (TPR) from ambient temperature to 773 K under a flow of H 2 . The Ni species was present as Ni(OH) 2 in the passivated sample. Two peaks were detected by gas analysis during TPR. The quick XAFS analysis revealed that the first peak at 390 K was due to desorption of water from Ni(OH) 2 accompanied by formation of atomically dispersed Ni 2+ species. The second peak, observed at 773 K, was due to the regeneration of Ni 2 P by the simultaneous reductive reaction of the atomically dispersed Ni oxide and the phosphate species, followed by growth of Ni 2 P nanocrystals. No formation of Ni metallic phase was observed.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Catalysis and Hydrodesulfurization Studies · Catalytic Processes in Materials Science · Nanomaterials for catalytic reactions
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
National Institute of Advanced Industrial Science and Technology, 1-1-1, Higashi, Tsukuba, Ibaraki 305-8565, Japan
Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organisation, Oho 1-1, Tsukuba, Ibaraki 305-0801, Japan
Catalysis Research Center, Hokkaido University, Kita-ku N21W10, Sapporo, Hokkaido 001-0021, Japan
Environmental Catalysis and Materials Laboratory, Department of Chemical Engineering and Chemistry, Virginia Polytechnic Institute and State Unversity, Blacksburg, Virginia 24061-0211, United States
Department of Chemical Systems Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
College of Life Science, Ritsumeikan University, 1-1-1 Noji Higashi, Kusatsu, Shiga 525-8577, Japan
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