Catalytic dehydration of ethanol to ethylene and diethyl ether over alumina catalysts containing different phases with boron modification

Chaichana, Ekrachan; Boonsinvarothai, Nopparat; Chitpong, Nithinart; Jongsomjit, Bunjerd

doi:10.1007/s10934-018-0663-7

Cited by 26 publications

(15 citation statements)

References 45 publications

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“…The catalytic activity of samples obtained is higher or comparable to the commercial NKC-03A with αETH = 98% at Т = 533 K and SETH = 98% [161] and Al-B with SETH = 92% at Т = 673 K and SDEE = 57% at Т = 573 K [16,162]. 4+ 12-хO24] × wH2O 3.2.1.…”

Section: Hzsm(12)mentioning

confidence: 75%

Design of MFI Type Aluminum- and Titanium-Containing Zeolites

2021

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HZSM-5 (MFI type) of composition (Hx)[Al3+xSi12−xO24] × wH2O and nanocomposites NA/HZSM-5, NA:M/HZSM-5 (NA—nanoscale anatase; M = V, Ni, Ag) with Si/Al = 12, 25, 40, 300 (sp.gr. Pnma or P21/n; z = 8), as well as zeolites [(Ti4+xSi12−xO24] × wH2O (TS) with Si/Ti = 47, 53, 73.5 (sp.gr. Pnma) were studied by XRPD, XAS, FTIR-spectroscopy, BET, XPS, SEM, EDX, TPD, UV–VIS-spectroscopy, UV–DRS, and chemiluminescence methods. The results obtained together with photocatalytic, adsorption, antimicrobial, catalytic properties were analyzed using crystallochemical concepts and literature data. It was shown that NA or NA:M introduction into HZSM-5 leads, respectively, to the photodegradation of MeO dye in the UV region or difenoconazole in the visible range, and contributes to the appearance in the dark of adsorption (almost complete extraction of P(V), As(V), and Se(V) from aquatic environment) and bacteriostatic properties in respect to Staphylococcus epidermidis, Bacillus antracoides, and Escherichia coli for NA:Ag/HZSM-5(40, 300). The presence of titanium ions in NA nanoparticles on the HZSM-5 surface improves the catalytic activity in ethanol and propane (the best performance for NA/HZSM-5(25) and NA/HZSM-5(40), respectively) conversion. Determination of the composition (surface and bulk) and structure (statistical and local) of TS zeolites together with the found correlations made it possible to propose new catalysts in the reactions of propane, ethanol, and allyl chloride conversion.

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Section: Hzsm(12)mentioning

confidence: 75%

Design of MFI Type Aluminum- and Titanium-Containing Zeolites

2021

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“…Increasing the Brønsted acid site amount on the catalyst pronounces to the selectivity of long-chain hydrocarbons increases and the selectivity of short-chain hydrocarbon decreases. On the other hand, increasing the Lewis acid site amount leads to higher selectivity of short-chain hydrocarbons and lower selectivity of long-chain hydrocarbons, as suggested by Fan et al 28,43 3.3. Effect of Catalyst Type on the Component Composition of the Liquid Product.…”

Section: Catalyst Performance Testing On Catalyticmentioning

confidence: 87%

Enhancing Brønsted and Lewis Acid Sites of the Utilized Spent RFCC Catalyst Waste for the Continuous Cracking Process of Palm Oil to Biofuels

Istadi

Riyanto

Buchori

et al. 2020

Ind. Eng. Chem. Res.

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Catalyst waste from the residue fluid catalytic cracking (RFCC) plant process can still be utilized to catalyze the catalytic cracking of palm oil to fuels. However, we should regenerate the active sites of the catalyst waste. This paper focuses on enhancement of Brønsted and Lewis acid sites on the spent RFCC catalyst waste through various acid treatments in order to regenerate its catalyst active sites. In order to regenerate the Brønsted and the Lewis acid sites as active sites in the palm oil catalytic cracking, the spent RFCC catalyst was treated by citric acid, sulfuric acid, and mixture of both acids. The catalysts were characterized by X-ray fluorescence, X-ray diffraction, Brunauer–Emmett–Teller-Barrett–Joyner–Halenda, and pyridine-FTIR analysis. The modified catalyst performance was tested over a fixed bed reactor for the catalytic cracking process of palm oil to liquid fuels. It was found that the acid treatment on the spent RFCC catalyst can increase surface area, pore volume, and Brønsted to Lewis acid site ratio of catalysts. The Brønsted acid sites of the spent RFCC catalyst strongly increase by the treatment using sulfuric acid, which is because of the proton transfer from acid to catalyst and because of the formation of sulfate groups (HOSO3−) in the catalysts. It was found that the Brønsted acid site leads to the formation of long-chain hydrocarbon, while the Lewis acid site pronounces the formation of short-chain hydrocarbon and coke. Moreover, the total acidity and the Lewis acid site amount on the catalyst have roles in the formation of hydrocarbon fraction in the liquid product.

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“…Currently, amorphous compounds play an ambiguous role in petrochemistry [4][5][6][7][8][9][10][11][14][15][16][17]19,[26][27][28][29][41][42][43][44][45][46][47][48][49]54,62,[66][67][68][69][70][71][72][73][74][75][76][77][78][79]. They are often considered as an undesirable component of heterogeneous alumina catalysts, since they are inevitably formed during the synthesis methods of aluminum hydroxides (precipitation and alcohol technology) [6,9,11,17,37,45,58,…”

Section: The Role Of Amorphous Aluminum Compounds In Petrochemistrymentioning

confidence: 99%

“…In contrast to the conventional methods of processing heavy oils by thermal cracking and hydrocracking, the mechanisms of processing hydrocarbons with the presence of catalysts are more complex and still largely disputed in the scientific arena. For example, the alumina support plays an important role in the catalyst, which can also participate in the reactions at the catalyst active sites [67][68][69][70][71][72][73][74][75][76][77][78][79][80][81].…”

Section: Potential Application Amorphous Aluminum Compounds In Oil Refiningmentioning

confidence: 99%

A Review on the Role of Amorphous Aluminum Compounds in Catalysis: Avenues of Investigation and Potential Application in Petrochemistry and Oil Refining

et al. 2021

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Aluminum oxides and hydroxides are widely applied because of the great variety of their modifications. In particular, aluminum oxides and hydroxides are used in petrochemistry and oil refining. However, amorphous aluminum compounds have not been sufficiently studied due to the complexity of their synthesis and the problems encountered during their study. The study of amorphous aluminum compounds is hindered by the ambiguity of terminology. In this work, the structures of amorphous aluminum compounds prepared by different methods and the properties that determine their applications have been highlighted in detail. Amorphous aluminum compounds play both positive and negative roles in petrochemistry; however, in petroleum refining, amorphous compounds (without promoters and transition metal salts) demonstrate a promising catalytic performance in oil upgrading.

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Catalytic dehydration of ethanol to ethylene and diethyl ether over alumina catalysts containing different phases with boron modification

Cited by 26 publications

References 45 publications

Design of MFI Type Aluminum- and Titanium-Containing Zeolites

Design of MFI Type Aluminum- and Titanium-Containing Zeolites

Enhancing Brønsted and Lewis Acid Sites of the Utilized Spent RFCC Catalyst Waste for the Continuous Cracking Process of Palm Oil to Biofuels

A Review on the Role of Amorphous Aluminum Compounds in Catalysis: Avenues of Investigation and Potential Application in Petrochemistry and Oil Refining

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