An efficient magnetic carbon-based solid acid treatment for corncob saccharification with high selectivity for xylose and enhanced enzymatic digestibility

Qi, Wei; Liu, Guifeng; He, Chao; Liu, Shuna; Lu, Sitong; Yue, Jun; Wang, Qiong; Wang, Zhongming; Yuan, Zhenhong; Hu, Jianhua

doi:10.1039/c8gc02854k

Cited by 82 publications

(59 citation statements)

References 48 publications

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“…Advanced thermal treatments are gaining interest, as these have the advantage of drastic volume reduction and energy recovery (Aguado et al, 2008;Cheng et al, 2019;Yu et al, 2019). Among these, pyrolysis is regarded as one potentially useful method, due to its lower emissions, reasonable cost and simple operation (Qi et al, 2019;Sharuddin et al, 2016). Understanding the process of pyrolysis of plastic waste and its kinetics is important for reactor design and the selection of optimization Kinetic studies on the pyrolysis of plastic waste using a combination of model-fitting and model-free methods parameters in practice.…”

Section: Introductionmentioning

confidence: 99%

Kinetic studies on the pyrolysis of plastic waste using a combination of model-fitting and model-free methods

Yao

et al. 2020

Waste Manag Res

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116

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In this work, the pyrolysis behavior of plastic waste—TV plastic shell—was investigated, based on thermogravimetric analysis and using a combination of model-fitting and model-free methods. The possible reaction mechanism and kinetic compensation effects were also examined. Thermogravimetric analysis indicated that the decomposition of plastic waste in a helium atmosphere can be divided into three stages: the minor loss stage (20–300°C), the major loss stage (300–500°C) and the stable loss stage (500–1000°C). The corresponding weight loss at three different heating rates of 15, 25 and 35 K/min were determined to be 2.80–3.02%, 94.45–95.11% and 0.04–0.16%, respectively. The activation energy ( Ea) and correlation coefficient ( R2) profiles revealed that the kinetic parameters calculated using the Friedman and Kissinger–Akahira–Sunose method displayed a similar trend. The values from the Flynn–Wall–Ozawa and Starink methods were comparable, although the former gave higher R2 values. The Eα values gradually decreased from 269.75 kJ/mol to 184.18 kJ/mol as the degree of conversion ( α) increased from 0.1 to 0.8. Beyond this range, the Eα slightly increased to 211.31 kJ/mol. The model-fitting method of Coats–Redfern was used to predict the possible reaction mechanism, for which the first-order model resulted in higher R2 values than and comparable Eα values to those obtained from the Flynn–Wall–Ozawa method. The pre-exponential factors (ln A) were calculated based on the F1 reaction model and the Flynn–Wall–Ozawa method, and fell in the range 59.34–48.05. The study of the kinetic compensation effect confirmed that a compensation effect existed between Ea and ln A during the plastic waste pyrolysis.

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Section: Introductionmentioning

confidence: 99%

Kinetic studies on the pyrolysis of plastic waste using a combination of model-fitting and model-free methods

Yao

et al. 2020

Waste Manag Res

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116

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“…Their dual rule in HTL of microalgae helps to avoid the Maillard reactions between the reducing monosaccharides and amino acids, leading to the lower nitrogen content of algal biocrude. [32] However, the Keggin-type HPAs-catalyzed selective hydrothermal oxidation of microalgae for low-nitrogen biofuel production has been rarely reported.…”

Section: Introductionmentioning

confidence: 99%

Keggin‐type Heteropolyacids‐Catalyzed Selective Hydrothermal Oxidation of Microalgae for Low Nitrogen Biofuel Production

Shen

Long

et al. 2020

ChemSusChem

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Hydrothermal liquefaction (HTL) of microalgae for biofuel production is suffering from low bio-oil yield and high heteroatomic compositions owing to their low efficiency and selectivity to hydrolysis of cellular compounds. Hereby we report Keggin-type (MoÀ VÀ P) heteropolyacids (HPAs)-catalyzed HTL of microalgae for efficient low-nitrogen biocrude production. The increases of reaction temperature, reaction time, and vanadium substitution degrees of HPAs are favorable to biocrude yield initially, whereas a significant decrease of biocrude yield is observed owing to the enhanced oxidation of carbohydrates above the optimum reaction conditions. The maximum biocrude yield of HPAs-catalyzed HTL of microalgae is 29.95 % at reaction temperature of 300°C, reaction time of 2 h, and 5 wt% of HPA-4, which is about 19.66 % higher than that of control with 71.17 % less N-containing compounds, including 1,3-propanediamine, 1-pentanamine, and 2, 2'heptamethylene-di-2-imidazoline than that of control. This work reveals that HPAs with Brønsted acidity and reversible redox properties are capable of both enhancing biocrude production via catalyzing the hydrolysis of cellular compounds and reducing their nitrogen content through avoiding the Maillard reactions between the intermediates of hydrolysis of carbohydrates and proteins. HPAs-catalyzed HTL is an efficient strategy to produce low N-containing biofuels, possibly paving the way of their direct use in modern motors.

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“…, no remanence or coercivity for them were observed from the magnetic hysteresis loop, indicating the nearly superparamagnetic performances of those samples . The saturation magnetization intensity values for Fe 3 O 4 /MCMB, Fe 3 O 4 /Cl–MCMB, Fe 3 O 4 /Cl–MCMB–SO 3 H, and RFe 3 O 4 /Cl–MCMB–SO 3 H were 34.4, 31.7, 30.5 and 29.4 emu/g, respectively, which was beneficial in the catalyst separation from the residue with an external magnet . After the sulfonation and regeneration reaction, the saturation magnetization intensity slightly decreased, possibly attributed to the loss of trace amount of magnetic substance from the solid acid.…”

Section: Resultsmentioning

confidence: 93%

“…Therefore, developing an easy‐to‐separate solid acid catalyst is necessary in the conversion of cellulose into biofuels or platform chemicals. A magnetically separable catalyst has recently received considerable attention because of the easy separation from the reaction mixture by a permanent magnet, which facilitates the repetitive use of the catalyst and is beneficial in saving energy and decreasing the cost of the target product . Although the magnetic carbon‐based solid acid showed a promising advantage in the hydrolysis of biomass, the synthetic route usually was a complicated and time‐consuming process.…”

Section: Introductionmentioning

confidence: 99%

Catalytic hydrolysis of cellulose to total reducing sugars with superior recyclable magnetic multifunctional MCMB‐based solid acid as a catalyst

Shi

Zhang

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Effective cellulose hydrolysis has a huge potential for producing high value-added biomass-based platform chemicals, such as glucose, hydroxymethylfurfural, levulinic acid, and total reducing sugars (TRS). Particularly, a magnetic multifunctional solid acid catalyst (Fe 3 O 4 /Cl-MCMB-SO 3 H) was synthesized by loading the active groups on the magnetic mesocarbon microbead (MCMB) derived from the co-calcination of coal tar pitch and ferroferric oxide, which was applied as a catalyst in the conversion of cellulose into TRS. RESULTS: Given the superior properties of MCMB, a novel magnetic MCMB-based solid acid with cellulose-binding domain (-Cl group) and catalytic domain (-SO 3 H group) was successfully prepared. Results indicated that this catalyst exhibited superior catalytic activity, recyclability and regenerability, and easy separation from the reactant. The acidic densities of -SO 3 H and -Cl in Fe 3 O 4 /Cl-MCMB-SO 3 H reached 1.77 and 1.32 mmol/g, respectively. The 68.6% TRS yield can be obtained from cellulose at 140 ∘ C for 3 h in distilled water by using Fe 3 O 4 /Cl-MCMB-SO 3 H as the catalyst.The TRS yield still reached 61.1% after the catalyst was used six times. Importantly, through catalyst regeneration, the -SO 3 H density and TRS yield still reached 1.69 mmol/g and 67.3%, indicating that the catalyst exhibited excellent regenerability. CONCLUSION: Such multifunctional magnetic catalyst would be a promising catalyst in the conversion of cellulose into biofuels, which was attributed to the efficient catalytic performance, magnetism, and excellent recyclability and regenerability.

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An efficient magnetic carbon-based solid acid treatment for corncob saccharification with high selectivity for xylose and enhanced enzymatic digestibility

Abstract: An efficient magnetic carbon-based solid acid treatment for corncob saccharification.

Cited by 82 publications

References 48 publications

Kinetic studies on the pyrolysis of plastic waste using a combination of model-fitting and model-free methods

Kinetic studies on the pyrolysis of plastic waste using a combination of model-fitting and model-free methods

Keggin‐type Heteropolyacids‐Catalyzed Selective Hydrothermal Oxidation of Microalgae for Low Nitrogen Biofuel Production

Catalytic hydrolysis of cellulose to total reducing sugars with superior recyclable magnetic multifunctional MCMB‐based solid acid as a catalyst

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