Global Warming Impacts on the Environment in the Last Century

Sankar, M.; Raj, Anu David; Kumar, Suresh; Chatterjee, Uday

doi:10.1007/978-3-031-15501-7_3

Cited by 9 publications

(8 citation statements)

References 118 publications

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“…[68,69] Meanwhile, progress in the quantitative application is consolidating with the use of quick quantitative HSQC (QQ-HSQC) and time-zero HSQC (HSQC 0 ), which use pulse sequences to better quantify the identified substructures. However, semi-quantitative determination of the relative abundance of bonds is possible when the 1 H- 13 C pairs are in a similar chemical environment, such as aliphatic and aromatic agglomeration regions, since one can assume similar 1 J CH values under these conditions, which lead to a similar response factor. [70,71] Thus, in addition to the monolignol ratios and OH abundances, a statement can be made about the distribution of the various lignin linkages.…”

Section: Analytical Methods For Lignin Structure Elucidationmentioning

confidence: 99%

“…The intensive use of fossil resources not only causes permanent damage to the environment, but also its limited availability in the face of growing global demand makes the transition from an oilbased to a bio-based society essential. [1] To meet the enormous DOI: 10.1002/mame.202300093 demand for industrial goods, renewable resources must be used in all their diversity. In addition, overall concepts for the design of a circular economy are needed.…”

Section: Introductionmentioning

confidence: 99%

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Beyond Yield Optimization: The Impact of Organosolv Process Parameters on Lignin Structure

Bergrath

Rumpf

Burger

et al. 2023

Macro Materials & Eng

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When optimizing the process parameters of the acidic ethanolic organosolv process, the aim is usually to maximize the delignification and/or lignin purity. However, process parameters such as temperature, time, ethanol and catalyst concentration, respectively, can also be used to vary the structural properties of the obtained organosolv lignin, including the molecular weight and the ratio of aliphatic versus phenolic hydroxyl groups, among others. This review particularly focuses on these influencing factors and establishes a trend analysis between the variation of the process parameters and the effect on lignin structure. Especially when larger data sets are available, as for process temperature and time, correlations between the distribution of depolymerization and condensation reactions are found, which allow direct conclusions on the proportion of lignin's structural features, independent of the diversity of the biomass used. The newfound insights gained from this review can be used to tailor organosolv lignins isolated for a specific application.

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Section: Analytical Methods For Lignin Structure Elucidationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Beyond Yield Optimization: The Impact of Organosolv Process Parameters on Lignin Structure

Bergrath

Rumpf

Burger

et al. 2023

Macro Materials & Eng

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“…This warming trend was predominantly driven by anthropogenic CO 2 emissions . As per the United Nations, the atmospheric CO 2 level has seen a 50% increase over preindustrial levels, reaching 421 ppm in May 2022. − A potential approach for decreasing CO 2 levels in the atmosphere is the conversion of CO 2 into value-added hydrocarbons (HC), fuel, and chemicals by tandem catalysis. − …”

Section: Introductionmentioning

confidence: 99%

Intermediate Transfer Rates and Solid-State Ion Exchange are Key Factors Determining the Bifunctionality of In₂O₃/HZSM-5 Tandem CO₂ Hydrogenation Catalyst

Mahnaz,

Mangalindan,

Dharmalingam

et al. 2024

ACS Sustainable Chem. Eng.

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Identifying the descriptors for the synergistic catalytic activity of bifunctional oxide-zeolite catalysts constitutes a formidable challenge in realizing the potential of tandem hydrogenation of CO 2 to hydrocarbons (HC) for sustainable fuel production. Herein, we combined CH 3 OH synthesis from CO 2 and H 2 on In 2 O 3 and methanol-to-hydrocarbons (MTH) conversion on HZSM-5 and discerned the descriptors by leveraging the distance-dependent reactivity of bifunctional In 2 O 3 and HZSM-5 admixtures. We modulated the distance between redox sites of In 2 O 3 and acid sites of HZSM-5 from milliscale (∼10 mm) to microscale (∼300 μm) and observed a 3-fold increase in space-time yield of HC and CH 3 OH (7.5 × 10 −5 mol C g cat −1 min −1 and 2.5 × 10 −5 mol C g cat −1 min −1 , respectively), due to a 10-fold increased rate of CH 3 OH advection (1.43 and 0.143 s −1 at microscale and milliscale, respectively) from redox to acid sites. Intriguingly, despite the potential of a three-order-of-magnitude enhanced CH 3 OH transfer at a nanoscale distance (∼300 nm), the sole product formed was CH 4 . Our reactivity data combined with Raman, Fourier transform infrared (FTIR), and X-ray photoelectron spectroscopy (XPS) revealed the occurrence of solid-state-ion-exchange (SSIE) between acid sites and In δ+ ions, likely forming In 2 O moieties, inhibiting C−C coupling and promoting CH 4 formation through CH 3 OH hydrodeoxygenation (HDO). Density functional theory (DFT) calculations further revealed that CH 3 OH adsorption on the In 2 O moiety with preadsorbed and dissociated H 2 forming an H−In−OH−In moiety is the likely reaction mechanism, with the kinetically relevant step appearing to be the hydrogenation of the methyl species. Overall, our study revealed that efficient CH 3 OH transfer and prevention of ion exchange are the key descriptors in achieving catalytic synergy in bifunctional In 2 O 3 /HZSM-5 systems.

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“…The rapid diminution of fossil resources driven by modern industrialization has led to an insurmountable increase in anthropogenic carbon dioxide (CO 2 ) emissions. As per the United Nations, the atmospheric CO 2 level has seen a 50 % increase over pre‐industrial levels, reaching 421 parts per million (ppm) in May 2022 [1–3] . This increase has led to dire environmental challenges, such as rising sea levels, ocean acidification, and climate change.…”

Section: Introductionmentioning

confidence: 99%

“…As per the United Nations, the atmospheric CO 2 level has seen a 50 % increase over pre-industrial levels, reaching 421 parts per million (ppm) in May 2022. [1][2][3] This increase has led to dire environmental challenges, such as rising sea levels, ocean acidification, and climate change. Among many approaches that broadly encompass carbon capture, utilization, and storage (CCUS), a potential approach for mitigating and decreasing CO 2 levels in the atmosphere is the chemical transformation of CO 2 , captured either through industrial emissions or direct air capture (DAC) into value-added fuels and chemicals such as hydrocarbons, alcohols, and olefins.…”

Section: Introductionmentioning

confidence: 99%

Selective Valorization of CO₂ towards Valuable Hydrocarbons through Methanol‐mediated Tandem Catalysis

Mahnaz¹,

Dunlap²,

Helmer³

et al. 2023

ChemCatChem

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The thermocatalytic conversion of carbon dioxide (CO2) into valuable hydrocarbons presents a promising solution for mitigating anthropogenic CO2 emissions while producing drop‐in replacements for fossil‐derived products. Among the two tandem mechanisms for the direct hydrogenation of CO2, the methanol synthesis coupled with the methanol to hydrocarbon (MTH) reaction offers an improvement over the reverse water‐gas shift coupled with Fischer‐Tropsch synthesis reaction (RWGS‐FTS), as it is not limited Anderson‐Schulz‐Flory distribution and yields higher selectivity towards specific products (e.g., olefins, aromatics, higher hydrocarbons). Herein, we focus on the recent progress achieved through this pathway and outline the existing knowledge gaps. We discuss the challenges involved in the process and highlight the key descriptors in the selection of catalyst components. Finally, we present several potential solutions to circumvent the current challenges, aiming to expedite the advancement of this route toward an efficient CO2 hydrogenation process.

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Global Warming Impacts on the Environment in the Last Century

Cited by 9 publications

References 118 publications

Beyond Yield Optimization: The Impact of Organosolv Process Parameters on Lignin Structure

Beyond Yield Optimization: The Impact of Organosolv Process Parameters on Lignin Structure

Intermediate Transfer Rates and Solid-State Ion Exchange are Key Factors Determining the Bifunctionality of In₂O₃/HZSM-5 Tandem CO₂ Hydrogenation Catalyst

Selective Valorization of CO₂ towards Valuable Hydrocarbons through Methanol‐mediated Tandem Catalysis

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Global Warming Impacts on the Environment in the Last Century

Cited by 9 publications

References 118 publications

Beyond Yield Optimization: The Impact of Organosolv Process Parameters on Lignin Structure

Beyond Yield Optimization: The Impact of Organosolv Process Parameters on Lignin Structure

Intermediate Transfer Rates and Solid-State Ion Exchange are Key Factors Determining the Bifunctionality of In2O3/HZSM-5 Tandem CO2 Hydrogenation Catalyst

Selective Valorization of CO2 towards Valuable Hydrocarbons through Methanol‐mediated Tandem Catalysis

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Product

Resources

About

Intermediate Transfer Rates and Solid-State Ion Exchange are Key Factors Determining the Bifunctionality of In₂O₃/HZSM-5 Tandem CO₂ Hydrogenation Catalyst

Selective Valorization of CO₂ towards Valuable Hydrocarbons through Methanol‐mediated Tandem Catalysis