Improving HSAPO‐34 Methanol‐to‐Olefin Turnover Capacity by Seeding the Hydrocarbon Pool

Bollini, Praveen; Bhan, Aditya

doi:10.1002/cphc.201701027

Cited by 14 publications

(7 citation statements)

References 26 publications

(49 reference statements)

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“…Recent investigations indicated that formaldehydeformed through disproportionation of methanol during direct C-C bond formationcauses catalyst deactivation via interaction with aromatic molecules resulting in the formation of polycondensed aromatics. 55 Besides, formaldehyde formation is accompanied with the production of CH4. 56 It thus becomes clear that in order to achieve better catalyst stability and selectivity, the induction period should be re-engineered to avoid formaldehyde formation.…”

Section: Towards Improved Selectivity In Mthmentioning

confidence: 99%

Recent trends and fundamental insights in the methanol-to-hydrocarbons process

et al. 2018

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The production of high-demand chemical commodities, such as ethylene and propylene (methanol-toolefins), hydrocarbons (methanol-to-hydrocarbons), gasoline (methanol-to-gasoline) and aromatics (methanol-to-aromatics) from methanol-obtainable from alternative feedstocks, such as carbon dioxide, biomass, waste or natural gas through the intermediate formation of synthesis gas-has been central to research in both academia and industry. Although discovered in the late 1970s, this catalytic technology has only been industrially implemented over the last decade, with a number of large commercial plants already operating in Asia. However, as it is the case for other technologies, industrial maturity is not a synonym of full understanding. For this reason, research is still intense and a number of important discoveries have been reported over the last few years. In this review, we summarize the most recent advances in mechanistic understanding-including direct CC bond formation during the induction period and the promotional effect of zeolite topology and acidity on the alkene cycle-and correlate these insights to practical aspects in terms of catalyst design and engineering.

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Section: Towards Improved Selectivity In Mthmentioning

confidence: 99%

Recent trends and fundamental insights in the methanol-to-hydrocarbons process

et al. 2018

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“…The accumulation of "coke" (including PAHs) with reaction progress can gradually enhance ethene selectivity on SAPO-34 31,32 .…”

Section: Choosing Industrially Important Mto As a Model Reactionmentioning

confidence: 99%

Molecular elucidating of an unusual growth mechanism for polycyclic aromatic hydrocarbons in confined space

et al. 2020

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Extension and clustering of polycyclic aromatic hydrocarbons (PAHs) are key mechanistic steps for coking and deactivation in catalysis reactions. However, no unambiguous mechanistic picture exists on molecule-resolved PAHs speciation and evolution, due to the immense experimental challenges in deciphering the complex PAHs structures. Herein, we report an effective strategy through integrating a high resolution MALDI FT-ICR mass spectrometry with isotope labeling technique. With this strategy, a complete route for aromatic hydrocarbon evolution is unveiled for SAPO-34-catalyzed, industrially relevant methanol-to-olefins (MTO) as a model reaction. Notable is the elucidation of an unusual, previously unrecognized mechanistic step: cage-passing growth forming cross-linked multicore PAHs with graphene-like structure. This mechanistic concept proves general on other cage-based molecule sieves. This preliminary work would provide a versatile means to decipher the key mechanistic step of molecular mass growth for PAHs involved in catalysis and combustion chemistry.

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“…Unraveling the reaction mechanism is a big challenge in MTO conversion. For the MTO process, the dual‐cycle hydrocarbon pool schematic comprised of olefinic and aromatic methylation cycles has been well accepted , . In the induction period, the methanol was generated polymethylbenzene compounds, which are the most important active intermediate in the methanol conversion process .…”

Section: Resultsmentioning

confidence: 99%

Synthesis of SAPO‐34 Zeolite from Laponite and Its Application in the MTO Reaction

et al. 2020

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In this work, SAPO‐34 zeolite with high catalytic activity was successfully synthesized by hydrothermal method from laponite as the single Si source. Compared with the traditional method of synthesizing zeolites from clay, the laponite after swelling can be directly used in the synthesis process of zeolite. The crystallization behavior of SAPO‐34 synthesized from laponite was investigated by XRD, FTIR, N2 adsorption–desorption, SEM‐EDX, ICP‐MS, and DR‐UV/Vis. The process can be summarized as follows: the Si and Mg elements were produced by the depolymerization of laponite, then the primary building units of SAPO‐34 zeolite were formed under hydrothermal conditions; finally, the crystal nucleus began to form, and crystallization was triggered. Compared with the conventional SAPO‐34 synthesized from TEOS, the SAPO‐34 synthesized from laponite exhibited higher selectivity to light olefins and longer lifetime, which can be attributed to the suitable strength of acidity. This work points to a straightforward route to the synthesis of SAPO‐34 from laponite.

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Improving HSAPO‐34 Methanol‐to‐Olefin Turnover Capacity by Seeding the Hydrocarbon Pool

Cited by 14 publications

References 26 publications

Recent trends and fundamental insights in the methanol-to-hydrocarbons process

Recent trends and fundamental insights in the methanol-to-hydrocarbons process

Molecular elucidating of an unusual growth mechanism for polycyclic aromatic hydrocarbons in confined space

Synthesis of SAPO‐34 Zeolite from Laponite and Its Application in the MTO Reaction

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