Hydrothermal modification of the alumina catalyst for the skeletal isomerization of n-butenes

Mukhambetov, Ildar; Egorova, S. R.; Mukhamed’yarova, Aliya N.; Ламберов, А. А.

doi:10.1016/j.apcata.2018.01.024

Cited by 16 publications

(11 citation statements)

References 17 publications

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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%

“…A growing body of literature has studied the hydrothermal treatment of amorphous aluminum compounds due to the properties of final products and surface properties of phase compositions, which can be modified toward the crystallization [46,[54][55][56][57][58][59][60][61][62][63][64][65][66]. The main conditions that affect the phase composition of the obtained products are saturated vapor temperature and pressure.…”

Section: The Effect Of Amorphous Aluminum Compounds On Catalysts In Different Processes: the Introduction Of Hydrothermal Treatment Of Camentioning

confidence: 99%

“…We have previously described in [66] the positive effect of hydrothermal treatment on the alumina catalyst for the skeletal isomerization of n-butylenes to isobutylene due to the conversion of the amorphous component. The hydrothermally modified alumina was obtained by calcination of boehmite from Pural SB, SASOL (Germany), synthesized by the method of hydrolysis of aluminum alcoholates.…”

Section: The Effect Of Amorphous Aluminum Compounds On Catalysts In Different Processes: the Introduction Of Hydrothermal Treatment Of Camentioning

confidence: 99%

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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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Section: The Role Of Amorphous Aluminum Compounds In Petrochemistrymentioning

confidence: 99%

Section: The Effect Of Amorphous Aluminum Compounds On Catalysts In Different Processes: the Introduction Of Hydrothermal Treatment Of Camentioning

confidence: 99%

Section: The Effect Of Amorphous Aluminum Compounds On Catalysts In Different Processes: the Introduction Of Hydrothermal Treatment Of Camentioning

confidence: 99%

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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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“…After the addition of the alumina layer some 1-alkenes were isomerized, forming for example internal olefins such as (Z)-2-decene and (E)-2-decene (compounds 20 and 21, Figure 5, Zoom C). The acidic properties of alumina [28] are known to favor isomerization, cyclization [18] and eventually aromatization reactions [20] under such pyrolysis conditions.…”

Section: Temperature (°C)mentioning

confidence: 99%

Fast Catalytic Pyrolysis of Dilaurin in the Presence of Sodium Carbonate Alone or Combined with Alumina

et al. 2019

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The objective of this work was to study the fast pyrolysis of a diglyceride intermediate compound during the conversion of triglycerides to fatty acids, esters and/or hydrocarbons. Dilaurin was selected as a model compound. Pyrolysis was conducted in a micro-pyrolyzer coupled to GC-MS equipment at 500, 550 and 600 °C for 15 s in the presence of sodium carbonate (Na2CO3) as the catalyst. Results were compared to pyrolysis data using γ-Al2O3 as a catalyst. At 600 °C with Na2CO3 almost total conversion of diglyceride was obtained, with the formation of 41.3% hydrocarbons (C3 to C13). In the same conditions using alumina as a catalyst 68.5% of hydrocarbons were obtained. Na2CO3 presented itself as an efficient feedstock modifier, allowing pre-cracking and partial deoxygenation of the load. The use of the Na2CO3 and γ-Al2O3 conjugated system in layers reduced the fatty acid content in the products, increasing both the reagent conversion and the hydrocarbon variety (C3 to C23). This work suggests that the use of a double bed catalytic reactor is suitable for performing a deoxygenating pretreatment and producing hydrocarbons compatible with current liquid fuels, being potentially useful for more complex raw materials such as those from biomass treatments.

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“…The salts decompose with the formation a new binding phase after the calcination [13]. In our previous works [14], we have already shown that it is possible to improve the properties of catalyst for skeletal isomerization of n-butenes to isobutylene by transforming the amorphous component using hydrothermal treatment.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Obtaining Method on the Properties of Amorphous Aluminum Compounds

et al. 2019

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Amorphous aluminum compounds are formed during the synthesis of the γ-Al2O3 catalyst precursor. Amorphous compounds influence on the alumina catalyst variously due to different physicochemical properties, which depend on the method of their preparation. In this research, the comparative analysis of physicochemical properties of amorphous aluminum compounds that were obtained by the precipitation method, the thermal decomposition of aluminum nitrate, and alcoxide hydrolysis product were studied. It is the first time that a new method for calculating of quantitative phase composition of amorphous aluminum compounds using the X-ray powder diffraction, thermogravimetric and differential scanning calorimetry analysis, mass-spectrometry, and CHN-analysis was described. Properties of obtaining samples were studied using scanning electron microscopy, low-temperature nitrogen adsorption, and temperature programmed desorption of ammonium analyses. The methods of precipitation and thermal decomposition of aluminum nitrate allows for obtaining non-porous samples consisting of a mixture of amorphous phases (hydroxide and basic salt) that contain the metals impurities and have low acidity of the oxides obtained from them. The highly porous amorphous alumina formed by the thermal decomposition of the alcoxide hydrolysis product with the least amount of impurities and a high acidity of the surface was observed.

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Hydrothermal modification of the alumina catalyst for the skeletal isomerization of n-butenes

Cited by 16 publications

References 17 publications

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

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

Fast Catalytic Pyrolysis of Dilaurin in the Presence of Sodium Carbonate Alone or Combined with Alumina

Influence of the Obtaining Method on the Properties of Amorphous Aluminum Compounds

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