Intrinsic Kinetics of Ethanol Dehydration Over Lewis Acidic Ordered Mesoporous Silicate, Zr-KIT-6

Pan, Qing Jiang; Ramanathan, Anand; Snavely, William K.; Chaudhari, Raghunath V.; Subramaniam, Bala

doi:10.1007/s11244-014-0311-7

Cited by 18 publications

(12 citation statements)

References 19 publications

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“…SAPO-34 has shown excellent performance on the dehydration of methanol [132][133][134][135][136] and high activity on the dehydration of ethanol and butanol [126,127]. Zeolites such as HZSM-5 [137][138][139][140][141][142] and mesoporous Si-based materials such as Ni-MCM-41 and Zr-KIT-6 [143][144][145][146][147] have also shown good dehydration activity. According to various studies [145,148,149] materials with fewer Brønsted and more Lewis acid sites provide higher selectivity to the desired alkenes and show better stability since they are less conducive to carbon formation and deposition.…”

Section: Catalytic Upgrading Of Sugars Starches and Alcoholsmentioning

confidence: 99%

Green Diesel: Biomass Feedstocks, Production Technologies, Catalytic Research, Fuel Properties and Performance in Compression Ignition Internal Combustion Engines

et al. 2019

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The present investigation provides an overview of the current technology related to the green diesel, from the classification and chemistry of the available biomass feedstocks to the possible production technologies and up to the final fuel properties and their effect in modern compression ignition internal combustion engines. Various biomass feedstocks are reviewed paying attention to their specific impact on the production of green diesel. Then, the most prominent production technologies are presented such as the hydro-processing of triglycerides, the upgrading of sugars and starches into C15–C18 saturated hydrocarbons, the upgrading of bio-oil derived by the pyrolysis of lignocellulosic materials and the “Biomass-to-Liquid” (BTL) technology which combines the production of syngas (H2 and CO) from the gasification of biomass with the production of synthetic green diesel through the Fischer-Tropsch process. For each of these technologies the involved chemistry is discussed and the necessary operation conditions for the maximum production yield and the best possible fuel properties are reviewed. Also, the relevant research for appropriate catalysts and catalyst supports is briefly presented. The fuel properties of green diesel are then discussed in comparison to the European and US Standards, to petroleum diesel and Fatty Acid Methyl Esters (FAME) and, finally their effect on the compression ignition engines are analyzed. The analysis concludes that green diesel is an excellent fuel for combustion engines with remarkable properties and significantly lower emissions.

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Section: Catalytic Upgrading Of Sugars Starches and Alcoholsmentioning

confidence: 99%

Green Diesel: Biomass Feedstocks, Production Technologies, Catalytic Research, Fuel Properties and Performance in Compression Ignition Internal Combustion Engines

et al. 2019

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“…This scarcity of literature is due to the fact that a pure mesoporous silica material possesses a neutral framework, as well as its propensity to exhibit inherently negative traits such as poor hydrothermal stability and low catalytic activity, which limit its application as a catalyst medium [14,15]. In order to enable their application in catalysis, different structured mesoporous silicate materials have been investigated and various metal ions have been incorporated into the host mesoporous silica materials [16][17][18][19][20]. In particular, the isomorphic substitution of silicon with transition metals has proven to be an excellent strategy to generate catalytically active sites in mesoporous silicate materials [14,[21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Mechanistic insights into the production of methyl lactate by catalytic conversion of carbohydrates on mesoporous Zr-SBA-15

Yang

Tian

et al. 2016

Journal of Catalysis

113

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The as-synthesized Zr-SBA-15 catalysts with tunable mesoporous structures showed excellent catalytic performance for the conversion of carbohydrates to methyl lactate in a "onepot" process using near-critical methanol or methanol-water mixture as the solvents. The effects of reaction conditions, including temperature, reaction time, and catalyst loading amount, on the conversions of carbohydrates and the yields of methyl lactate were investigated. The high yields of methyl lactate, up to 41 % and 44%, were produced from pentose and hexose, respectively, in the near-critical methanol at 240°C. Moreover, the Si/Zr ratio of the Zr-SBA-15 catalysts profoundly affected the Lewis acidity and therefore the catalytic activity and selectivity to methyl lactate in the conversion of carbohydrates. The pore size of the Zr-SBA-15 catalysts, tuned by the synthesis temperature, strongly affected the formation of solid residues. The key intermediates such as glyceraldehyde, glycolaldehyde, and pyruvaldehyde were used as probe reactants to understand the mechanism. The role of the Zr-SBA-15 catalyst in the aldol-and retro-aldol condensation, isomerization, and Cannizzaro reactions of carbohydrates and their derivatives was discussed. Furthermore, 28% and 27% yields of methyl lactate were obtained from cellulose and starch, respectively, in methanol-water mixture (5 wt% water and 95 wt% methanol) at 240°C. The Zr-SBA-15 catalyst was relatively stable in short term without regeneration.

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“…Therefore, it clearly suggested that the Brönsted acid sites play a crucial role in the ethanol conversion and the formation of ethylene. However, Pan et al [38] observed the opposite trend with the Lewis acid site. They inferred that the near absence of the acidic Brönsted and the presence of strong Lewis site apparently enhanced the ethylene selectivity.…”

Section: Catalytic Performance Of Ethanol Dehydrationmentioning

confidence: 96%

A Comparative Study of Solvothermal and Sol‐Gel‐Derived Nanocrystalline Alumina Catalysts for Ethanol Dehydration

Wannaborworn

Praserthdam

Jongsomjit

2015

Journal of Nanomaterials

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The ethanol dehydration to ethylene over alumina catalysts prepared by solvothermal and sol-gel methods was investigated. Also, a commercial alumina was used for comparison purposes. The results showed that the catalytic activity depends on the properties of catalyst derived from different preparation methods and reaction temperature. The alumina synthesized by solvothermal method exhibited the highest activity. This can be attributed to the higher surface area and larger amount of acid site, especially the ratio of weak/strong acid strength as determined by N2physisorption and NH3-TPD studies. The solvothermal-derived catalyst exhibited an excellent performance with complete ethanol conversion and 100% selectivity to ethylene at 350°C in comparison with other ones. In addition, we further studied the catalytic dehydration of alumina catalyst modified with Fe. The presence of 10 wt.% Fe decreased both conversion and ethylene selectivity. However, the acetaldehyde selectivity apparently increased. It was related to the dehydrogenation pathway that takes place on Fe species.

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Intrinsic Kinetics of Ethanol Dehydration Over Lewis Acidic Ordered Mesoporous Silicate, Zr-KIT-6

Cited by 18 publications

References 19 publications

Green Diesel: Biomass Feedstocks, Production Technologies, Catalytic Research, Fuel Properties and Performance in Compression Ignition Internal Combustion Engines

Green Diesel: Biomass Feedstocks, Production Technologies, Catalytic Research, Fuel Properties and Performance in Compression Ignition Internal Combustion Engines

Mechanistic insights into the production of methyl lactate by catalytic conversion of carbohydrates on mesoporous Zr-SBA-15

A Comparative Study of Solvothermal and Sol‐Gel‐Derived Nanocrystalline Alumina Catalysts for Ethanol Dehydration

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