2023
DOI: 10.1021/acscatal.3c04279
|View full text |Cite
|
Sign up to set email alerts
|

Formaldehyde-Induced Deactivation of ZSM5 Catalysts during the Methanol-to-Hydrocarbons Conversion

Charles W. P. Pare,
Przemyslaw Rzepka,
Patrick Hemberger
et al.

Abstract: Formaldehyde productivity and reactivity over zeolite catalysts are suggested to influence their selectivity and stability in the methanol-to-hydrocarbons (MTH) conversion. However, details of these relationships have yet to be established. In this study, we applied photoelectron photoion coincidence spectroscopy to examine the productivity of this intermediate over unpromoted and zinc-loaded ZSM-5 catalysts. Formaldehyde is the primary MTH product. Its production over unpromoted catalysts proceeds mainly via … Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
3
2

Citation Types

0
5
0

Year Published

2024
2024
2024
2024

Publication Types

Select...
5

Relationship

0
5

Authors

Journals

citations
Cited by 5 publications
(5 citation statements)
references
References 58 publications
0
5
0
Order By: Relevance
“…Conversely, aged Z 40 catalysts exhibit an increased HTI in comparison to the fresh catalyst, whereas the value of this parameter in the Z 15 catalyst is only slightly affected after long-term operation (Figure b). This indicates that aging of Z 40 catalysts promotes substantially the HT reactions that are considered essential for the formation of arene chain carriers and coke species. ,,, …”
Section: Resultsmentioning
confidence: 95%
See 3 more Smart Citations
“…Conversely, aged Z 40 catalysts exhibit an increased HTI in comparison to the fresh catalyst, whereas the value of this parameter in the Z 15 catalyst is only slightly affected after long-term operation (Figure b). This indicates that aging of Z 40 catalysts promotes substantially the HT reactions that are considered essential for the formation of arene chain carriers and coke species. ,,, …”
Section: Resultsmentioning
confidence: 95%
“…These catalysts were selected due to the industrial significance of ZSM-5 zeolites, which, among other favorable characteristics, also exhibit enhanced hydrothermal stability. Moreover, Z 15 and Z 40 zeolites, which exhibit low and moderate Si/Al ratios, respectively, are frequently employed as benchmark catalysts in various studies on MTH conversion. ,,,,, Importantly, these ZSM-5 materials allow for the investigation of performance changes in low- and medium-to-high-coking-resistant catalysts during their prolonged operation in the MTH process. In addition, the aluminum concentration in these materials enables more accurate assessment of acidity and aluminum speciation (vide infra), which becomes increasingly challenging to analyze spectroscopically in materials with higher Si/Al ratios.…”
Section: Resultsmentioning
confidence: 99%
See 2 more Smart Citations
“…Recently, HCHO was thought to participate in the synthesis of increased aromatics over Zn-modified zeolites, and the increase of aromatic selectivity is usually accompanied by the severer accumulation of coke and a higher deactivation rate. Hence, the online capturing of active intermediates, the elucidation of the formation pathway of HCHO, and the depiction of the HCHO-mediated reaction network are not only crucial for regulating the formation of aromatics but are also important for figuring out the deactivation mechanism of zeolite catalysts.…”
Section: Introductionmentioning
confidence: 99%