Nanoscale Chemical Imaging of an Individual Catalyst Particle with Soft X-ray Ptychography.

Autor:	Wise AM; Stanford Synchrotron Radiation Lightsource, Stanford University , Menlo Park, California 94025, United States., Weker JN; Stanford Synchrotron Radiation Lightsource, Stanford University , Menlo Park, California 94025, United States., Kalirai S; Inorganic Chemistry and Catalysis group, Debye Institute for Nanomaterials Science, Utrecht University , 3584 CG Utrecht, The Netherlands., Farmand M; Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States., Shapiro DA; Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States., Meirer F; Inorganic Chemistry and Catalysis group, Debye Institute for Nanomaterials Science, Utrecht University , 3584 CG Utrecht, The Netherlands., Weckhuysen BM; Inorganic Chemistry and Catalysis group, Debye Institute for Nanomaterials Science, Utrecht University , 3584 CG Utrecht, The Netherlands.
Jazyk:	angličtina
Zdroj:	ACS catalysis [ACS Catal] 2016 Apr 01; Vol. 6 (4), pp. 2178-2181. Date of Electronic Publication: 2016 Feb 26.
DOI:	10.1021/acscatal.6b00221
Abstrakt:	Understanding Fe deposition in fluid catalytic cracking (FCC) catalysis is critical for the mitigation of catalyst degradation. Here we employ soft X-ray ptychography to determine at the nanoscale the distribution and chemical state of Fe in an aged FCC catalyst particle. We show that both particle swelling due to colloidal Fe deposition and Fe penetration into the matrix as a result of precracking of large organic molecules occur. The application of ptychography allowed us to provide direct visual evidence for these two distinct Fe-based deactivation mechanisms, which have so far been proposed only on the basis of indirect evidence.
Databáze:	MEDLINE
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