02206nas a2200205 4500008004100000022001400041245011300055210006900168260000800237300001400245490000700259520151000266100001701776700002201793700001401815700001601829700001101845700001501856856012901871 2020 eng d a1463-926200aFunctionalized magnetic nanosized materials for efficient biodiesel synthesis via acid-base/enzyme catalysis0 aFunctionalized magnetic nanosized materials for efficient biodie cMAY a2977-30120 v223 a

According to the principles of green chemistry, the rapid recovery and reuse of catalysts after a catalytic reaction are important factors to realize the sustainable management of chemical production processes. The functionalization of magnetic nanoparticles is the basis for the efficient separation of heterogeneous catalysts from the reaction system by using the magnetic separation technology as well as for effectively bridging heterogeneous and homogeneous catalytic processes. This can considerably improve the production efficiency and reduce energy consumption as well. Owing to important applications as a potential biofuel or fuel additive, the synthesis of biodiesel mainly from low-cost biomass feedstocks has received considerable attention in the current biorefinery research. A simple synthesis process coupled with the application of functionalized magnetic catalysts can remarkably reduce the production cost and minimize waste generation, thereby promoting the potential development of green catalytic processes for the large-scale synthesis of biodiesel. In this review, the preparation methods, structural and performance control, and protection and functionalization of magnetic nanoparticles as well as the consequent catalytic effects in the synthesis of biodiesel (mainly long-chain fatty acid methyl esters) have been reported. In addition, various representative reaction mechanisms are discussed, emphasizing the existing challenges and prospects of industrialization.

1 aWang, Anping1 aSudarsanam, Putla1 aXu, Yufei1 aZhang, Heng1 aLi, Hu1 aYang, Song uhttps://library.ncl.res.in/content/functionalized-magnetic-nanosized-materials-efficient-biodiesel-synthesis-acid-baseenzyme02484nas a2200241 4500008004100000022001400041245008300055210006900138260000800207300001400215490000700229520167000236653001901906653002501925653002301950653003401973653002502007653003302032100002202065700001102087700003002098856011402128 2020 eng d a2155-543500aTiO2-based water-tolerant acid catalysis for biomass-based fuels and chemicals0 aTiO2based watertolerant acid catalysis for biomassbased fuels an cAUG a9555-95840 v103 a

Solid acid catalysts alone or in combination with redox metals play a pivotal role in biomass valorization to obtain alternative fuels and chemicals. In acid-catalyzed biomass conversions, water is a key reagent/byproduct that can induce leaching/poisoning of catalyst's acid species, a major problem toward catalyst recyclability and product purification. Thus, developing efficient water-tolerant solid acid catalysts is vital for viable biomass valorization. TiO2 is considered to be a promising water-tolerant solid acid catalyst for biomass conversions because of the presence of coordinatively unsaturated Ti4+ sites, which are robust and less prone to leaching in the aqueous medium. Besides, the synergistic combination of TiO2 with redox metals (Ru, Pd, Ni, Cu, etc.) provides abundant bifunctional acid-redox sites, which exhibit a favorable catalytic role in the deoxygenation of biomass molecules to practically useful hydrocarbons. Therefore, this review provides an overview of recent progress toward TiO2-based water-tolerant acid catalysis for biomass conversion, with a focus on hydrothermal stability of TiO2, its acidity, and catalysts' synthesis methods. Various biomass conversions over TiO2-based catalysts, where water-tolerant acid sites or acid-redox dual sites show a significant catalytic effect, were discussed. Structure-activity relationships based on water-tolerant Lewis acidity of TiO2 were emphasized. We believe that this review will provide valuable information for developing efficient water-tolerant solid acid catalysts not only for biomass valorization but also for other challenging reactions in the aqueous medium.

10aAcid catalysis10aacid-redox catalysis10aBiomass conversion10arenewable fuels and chemicals10aTiO2-based catalysts10awater-tolerant Lewis acidity1 aSudarsanam, Putla1 aLi, Hu1 aSagar, Tatiparthi, Vikram uhttps://library.ncl.res.in/content/tio2-based-water-tolerant-acid-catalysis-biomass-based-fuels-and-chemicals01674nas a2200217 4500008004100000022001400041245007800055210006900133260000800202300001400210490000700224520100000231100001601231700001901247700001601266700001801282700001101300700002201311700001501333856010801348 2021 eng d a1463-926200aRoom-temperature quasi-catalytic hydrogen generation from waste and water0 aRoomtemperature quasicatalytic hydrogen generation from waste an cOCT a7528-75330 v233 aA solvation-driven catalyst-free H-2 generation system from water and various waste hydrosilanes at room temperature was developed, with good to quantitative H-2 yields in minutes. Using a green solvent is found to promote the strong coordination of proton carriers with hydrosilane to liberate H-2 based on molecular dynamics simulations. Theoretical calculations clarify that OH(-)in situ generated from H2O enabled by solvation is favorable for activating the Si-H species of hydrosilane, and the in situ formed Si-OH interacts more effectively with the adjacent remaining Si-H, both contributing to the overall enhanced H-2 generation. Moreover, the overall life-cycle impacts of the developed system are less than those of industrial H-2 production processes, especially in ozone layer depletion and abiotic depletion resources - fossil fuels. This protocol realizes the potential of efficiently producing H-2 from waste and water, and opens a new avenue to alleviate petroleum consumption.1 aWu, Hongguo1 aZhang, Li-Long1 aWang, Junqi1 aJiang, Yiyuan1 aLi, Hu1 aSudarsanam, Putla1 aYang, Song uhttps://library.ncl.res.in/content/room-temperature-quasi-catalytic-hydrogen-generation-waste-and-water02065nas a2200265 4500008004100000245011200041210006900153260000800222300001100230490000600241520121800247653002601465653001401491653002801505653001801533653001501551100001501566700002201581700001501603700001701618700001601635700001101651700001501662856012201677 2021 eng d00aSulfonic acid-functionalized heterogeneous catalytic materials for efficient biodiesel production: a review0 aSulfonic acidfunctionalized heterogeneous catalytic materials fo cFEB a1047190 v93 a

The development of social productive forces leads to the increasing consumption of fossil fuels. However, the burning of traditional fossil fuels releases huge amounts of carbon emissions into the atmosphere, resulting in drastically increased global surface temperatures, and hence, global warming and abnormal climate change. Biodiesel, which can be produced by (trans)esterification of bio-oils using solid acid catalysts, is recognized as renewable and clean energy, alternative to fossil-derived diesel, and it can meet society's requirements. This review describes the catalytic conversion of bio-derived oils into biodiesel using various sulfonic acid-functionalized heterogeneous catalytic materials that show higher catalytic efficiency and superior recyclability. Besides, various methods of biodiesel preparation and the appropriate design and preparation of robust and efficient catalytic materials for biodiesel production were provided. Finally, the mechanisms of different catalytic esterification and transesterification reactions for biodiesel synthesis, the relevant reaction kinetic models, and techno-economic analysis of biodiesel production were critically discussed in this review.

10a(Trans)esterification10aBiodiesel10aheterogeneous catalysis10akinetic study10asolid acid1 aTan, Xiang1 aSudarsanam, Putla1 aTan, Jinyu1 aWang, Anping1 aZhang, Heng1 aLi, Hu1 aYang, Song uhttps://library.ncl.res.in/content/sulfonic-acid-functionalized-heterogeneous-catalytic-materials-efficient-biodiesel01902nas a2200253 4500008004100000022001400041245009800055210006900153260000800222300001100230490000800241520108800249653002001337653001601357653001701373653002601390653002001416100001601436700001101452700001801463700002201481700001501503856013001518 2022 eng d a0016-236100aProtophilic solvent-impelled quasi-catalytic CO2 valorization to formic acid and N-formamides0 aProtophilic solventimpelled quasicatalytic CO2 valorization to f cOCT a1250740 v3263 a

As a low-price and luxuriant C1 sustainable resource, CO2 has the privilege of synthesizing hydrogen carriers and valuable chemicals. However, expensive metallic and organic catalysts are often indispensable for going on wheels of the relevant reaction processes. In this work, a protophilic solvent-impelled quasi-catalytic system was developed for efficient synthesis of formic acid and various N-formamides with high yields of 76-94% via reductive CO2 functionalization under mild reaction conditions (50 ?). Direct activation of the liquid hydrosilane toward the reduction of CO2 enabled by DMSO with optimum basicity/protophilicity is the predominant reaction route among the examined interaction models, while carbonic acid potentially derived from excessive CO2 and residual water inhibits the reaction, as explicitly disclosed by theoretical calculations and isotope labeling experiments. In addition, the in situ formed O-formyl species is conductive to the cascade CO2 reduction steps, which remarkably facilitated the overall quasi-catalytic upgrading process.

10aCO2 utilization10aFormic acid10aGreen energy10aNitrogenous chemicals10aQuasi-catalysis1 aWu, Hongguo1 aLi, Hu1 aZhao, Wenfeng1 aSudarsanam, Putla1 aYang, Song uhttps://library.ncl.res.in/content/protophilic-solvent-impelled-quasi-catalytic-co2-valorization-formic-acid-and-n-formamides01741nas a2200229 4500008004100000022001400041245008100055210006900136260000900205300001600214490000700230520102700237100001201264700001601276700001801292700002001310700001401330700001801344700002201362700001101384856011601395 2023 eng d a1359-734500aPhotocatalytic C-N bond construction toward high-value nitrogenous chemicals0 aPhotocatalytic CN bond construction toward highvalue nitrogenous cDEC  a14341-143520 v593 a

The construction of carbon-nitrogen bonds is vital for producing versatile nitrogenous compounds for the chemical and pharmaceutical industries. Among developed synthetic approaches to nitrogenous chemicals, photocatalysis is particularly prominent and has become one of the emerging fields due to its unique advantages of eco-sustainable characteristics, efficient process integration, no need for high-pressure H2, and tunable synthesis methods for developing advanced photocatalytic materials. Here, the review focuses on potential photocatalytic protocols developed for the construction of robust carbon-nitrogen bonds in discrepant activation environments to produce high-value nitrogenous chemicals. The photocatalytic C-N bond construction strategies and involved reaction mechanisms are elucidated. This review focuses on potential photocatalytic protocols developed for the construction of robust carbon-nitrogen bonds in discrepant activation environments to produce high-value nitrogenous chemicals.

1 aLi, Jie1 aLiu, Tengyu1 aSingh, Nittan1 aHuang, Zhuochun1 aDing, Yan1 aHuang, Jinshu1 aSudarsanam, Putla1 aLi, Hu uhttps://library.ncl.res.in/content/photocatalytic-c-n-bond-construction-toward-high-value-nitrogenous-chemicals