Postsynthesis of mesoporous ZSM-5 zeolites with TPAOH-assisted desilication and determination of activity performance in N2O decomposition

Shen, Qun; Zhang, Lingyun; Wu, Minfang; He, Chi; Wei, Wei; Sun, Nannan; Sun, Yuhan

doi:10.1007/s10934-016-0313-x

Cited by 9 publications

(6 citation statements)

References 27 publications

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“…The catalysts were prepared via top‐down strategies starting from HZSM‐5 (protonic form) which was obtained by calcining commercial (microcrystalline) zeolite NH 4 ZSM‐5, at 550 °C for 5 h (heating rate of 1 °C min −1 ). HZSM‐5 was subjected to desilication using NaOH (SIB procedure), TPAOH (QAH procedure) or a combination of both bases (mixB procedure), and acid treatment using HCl (Cl) or oxalic acid (Ox), adapting different procedures (Scheme ) . Table summarizes the conditions of the modification protocols and the resultant catalysts’ names.…”

Section: Methodsmentioning

confidence: 99%

“…HZSM-5 was subjected to desilication using NaOH (SIB procedure), TPAOH (QAH procedure) or a combination of both bases (mixB procedure), and acid treatment using HCl (Cl) or oxalic acid (Ox), adapting different procedures (Scheme 2). [39][40][41][42] Table 1 summarizes the conditions of the modification protocols and the resultant catalysts' names.…”

Section: Preparation Of the Catalystsmentioning

confidence: 99%

“…[23][24][25][26][27][28][29] In the former case, mesoporosity is formed by hard templating (e. g. carbonaceous or polymeric compounds), [30][31][32] soft templating (e. g. surfactants, organosilanes), [33][34][35] or indirect templating methods (e. g. steam-assisted and solid-phase crystallization). [36][37][38] In top-down approaches, mesoporosity is introduced by strategically removing framework atoms from pre-made zeolites; e. g. desilication via alkaline treatment, [39][40][41][42] and dealumination via acid treatment or steaming at high temperature. [39,[42][43][44][45] The top-down strategies are advantageously cheaper, relatively easy to reproduce and scale-up for larger production.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Conversion of 1‐butene over Modified Versions of Commercial ZSM‐5 to Produce Clean Fuels and Chemicals

et al. 2019

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The oligomerisation of light olefins, obtainable from fossil/renewable sources and refinery streams, is an attractive route to produce clean synthetic fuels and added‐value chemicals. ZSM‐5 is a type of catalyst used in commercial olefin oligomerisation processes. Using appropriate modification procedures, it was possible to prepare catalysts with improved performances. Various modified versions of commercially available ZSM‐5 were prepared and investigated for 1‐butene oligomerisation under high‐pressure, continuous‐flow operation (30 bar, 200 °C). Simple, up‐scalable top‐down strategies involving base‐acid treatments of ZSM‐5 led to catalysts possessing enlarged pores and the required acidity for converting 1‐butene to higher molar mass products. In targeting diesel type products, the modified catalysts led to up to 86 % butenes conversion, space time yield of 852 mg gcat−1 h−1 and mass ratio diesel:naphtha cuts of 2.2. Characterisation studies and multivariate/principal component analysis helped categorise the differently prepared catalysts, and gain insights into complex interplay of material properties influencing the catalytic reaction.

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Section: Methodsmentioning

confidence: 99%

Section: Preparation Of the Catalystsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Catalytic Conversion of 1‐butene over Modified Versions of Commercial ZSM‐5 to Produce Clean Fuels and Chemicals

et al. 2019

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“…In addition, desilication quite often proceeds at the expense of losing considerable microporosity. In order to minimize the loss of micropores, an important advance is achieved by substituting NaOH with an organic base (TPAOH or TBAOH). , Introducing TPA + or TBA + can slow the desilication rate, leading to the formation of smaller mesopores (size of 6–7 nm), and the loss of microporosity is only 20% instead of the 50% with NaOH.…”

Section: Introductionmentioning

confidence: 99%

“…In order to minimize the loss of micropores, an important advance is achieved by substituting NaOH with an organic base (TPAOH or TBAOH). 19,20 Introducing TPA + or TBA + can slow the desilication rate, leading to the formation of smaller mesopores (size of 6−7 nm), and the loss of microporosity is only 20% instead of the 50% with NaOH. The strength, concentration, and distribution of acid sites also strongly determine the catalyst stability and product selectivity.…”

Section: Introductionmentioning

confidence: 99%

Insight into the Selection of the Post-Treatment Strategy for ZSM-5 Zeolites for the Improvement of Catalytic Stability in the Conversion of Methanol to Hydrocarbons

Qian

et al. 2020

Ind. Eng. Chem. Res.

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Desilication and dealumination are two common strategies to modify acidity and porosity of the ZSM-5 catalyst to enhance catalytic stability. However, the applicability of these strategies on the post treatment of specific ZSM-5 remains to be investigated. In this paper, a series of post-treated nano-ZSM-5 was prepared using single dealumination and desilication or combining two strategies and the effects of the silicon–aluminum structure, porosity, and acidity on catalytic stability of methanol to hydrocarbons (MTH) have been comparatively studied. This study found that for nano-ZSM-5 whose diffusion limitation is not the main cause of deactivation, dealumination should be considered to optimize acidity and silicon–aluminum structure on the surface for the improvement of catalytic stability, while for micro-ZSM-5, desilication should be first applied to construct mesopores to reduce diffusion constraints, followed by dealumination to optimize acidity and surface silicon–aluminum structure to improve the catalytic stability.

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Facile synthesis of hydrothermally stable mesoporous ZSM-5 zeolite from Al- SBA-16 via steam assisted crystallization

Kamil

Cheralathan

2020

J Porous Mater

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Postsynthesis of mesoporous ZSM-5 zeolites with TPAOH-assisted desilication and determination of activity performance in N2O decomposition

Cited by 9 publications

References 27 publications

Catalytic Conversion of 1‐butene over Modified Versions of Commercial ZSM‐5 to Produce Clean Fuels and Chemicals

Catalytic Conversion of 1‐butene over Modified Versions of Commercial ZSM‐5 to Produce Clean Fuels and Chemicals

Insight into the Selection of the Post-Treatment Strategy for ZSM-5 Zeolites for the Improvement of Catalytic Stability in the Conversion of Methanol to Hydrocarbons

Facile synthesis of hydrothermally stable mesoporous ZSM-5 zeolite from Al- SBA-16 via steam assisted crystallization

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