Dealumination of mordenites with acetic acid and their catalytic activity in the alkylation of cumene

Recently the concept of hierarchical zeolites invoked more explicit attention to enhanced accessibility of zeolites. By realizing additional meso-/macroporosity with the intrinsic microporosity of zeolites, a hierarchical pore system arises which facilitates mass transport while maintaining the zeolite shape selectivity. A great number of synthesis strategies have been developed for tailoring the pore architecture of hierarchical zeolites. In this review, we give a general overview of different synthesis methods for introduction of additional porosity. Advantages and limitations of these different synthesis approaches are addressed. The assessment of pore structure is essential to build the link between the zeolite pore structure and its functionality. A variety of 2D and 3D microscopy techniques are crucial to visualize the hierarchical pore structure, providing unique and comprehensive information that, however, should be linked to the results of bulk characterization techniques as much as possible. The microscopy techniques are classified and discussed according to the different probes used, such as optical light, X-rays and electrons. Representative work is reviewed to elucidate the capability of each technique and their drawbacks.

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“…122,123 The mechanism of mesopore formation is the same as steaming. 122,123 The mechanism of mesopore formation is the same as steaming.…”

Section: Demetallization Methodsmentioning

confidence: 99%

Tailoring and visualizing the pore architecture of hierarchical zeolites

et al. 2015

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“…These include treatment of zeolites with (NH 4 )SiF 6 , mineral acids (HCl, HNO 3 ), organic acids (i.e., acetic acid, oxalic acid) and chelating agents (i.e., EDTA). The factors that influence zeolite dealumination are mainly the zeolite structure and the dealumination treatment method [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Characterization and catalytic reactivity of mordenite – Investigation of selective oxidation of benzyl alcohol

Narayanan

Vijaya²,

Sivasanker

et al. 2015

Polyhedron

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“…The pore surface area and volume are believed affected by the increase of Si/Al ratio. Acid activation will increase adsorbent's surface area as stated by Boveri et al (2006) and Chung (2007) that acid preparation will increase adsorbent's surface area. Adsorbent without activation has surface area of 23 m 2 /g, while activation using acid, acid chemico-physical, base and base chemico-physical gave surface area of 98.…”

Section: Lapindo Mud Adsorbent Brunauer Emmett and Teller Surface Amentioning

confidence: 86%

Adsorption of Nickel in Nickel Sulphate Solution (Niso4) by Lapindo Mud

Sa’diyah

Syarwani

Hadiantoro

2017

JBAT

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This research has been carried out to produce adsorbent from Lapindo mud through various activation process, to adsorb nickel from nickel sulfate solution. Several investigations were performed in this research such as characterization of Lapindo mud before and after activation, effect of physical, chemical and chemico-physical activation to Si/Al ratio and determine the most effective method to produce adsorbent with high adsorption rate. Lapindo mud in this research was prepared through several methods such as without activation, calcination at 500 °C for 3 hours, chemical activation with 6 N HCl under reflux for 6 hours, chemical activation with 6 N NaOH under reflux for 6 hours, chemical activation with 6 N HCl under reflux followed by calcination process and the last treatment is chemical activation with 6 N NaOH under reflux followed by calcination process. The object of this research is the Lapindo mud adsorbent ability to adsorb Ni from NiSO4 solution. While activation methods and nickel concentration in this become independent variable. The reduction of nickel concentration efficiency is determined by the nickel concentration before and after adsorption process. The Si/Al ratio of Lapindo mud before activation process was 3.01 and it increase as the mud is activated. The highest Si/Al ratio was found at activation using HCl which is 7.85. Chemical activation using NaOH was found to be the best method to create the adsorbent with adsorption capacity 98.3%.

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Dealumination of mordenites with acetic acid and their catalytic activity in the alkylation of cumene

Cited by 52 publications

References 30 publications

Tailoring and visualizing the pore architecture of hierarchical zeolites

Tailoring and visualizing the pore architecture of hierarchical zeolites

Characterization and catalytic reactivity of mordenite – Investigation of selective oxidation of benzyl alcohol

Adsorption of Nickel in Nickel Sulphate Solution (Niso4) by Lapindo Mud

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