01821nas a2200241 4500008004100000022001400041245016400055210006900219260000900288300001400297490000600311520097800317653001501295653001801310653001401328653001801342653001001360100001801370700002401388700001801412700002201430856012701452 2021 eng d a2365-654900aEffect of rice husk particle size on ZSM-5 physico-chemical properties for selective formation of 1,3,5-trimethyl-2-benzylbenzene (Pharmaceutical Intermediate)0 aEffect of rice husk particle size on ZSM5 physicochemical proper cFEB  a1255-12620 v63 a

Rice husk, rich in silica and abundantly available as waste, is presently destroyed by burning, which creates environmental issues. Thus, it will be advantageous if this rice husk waste can be used for preparation of valuable products. One of the application is its use as silica source in the synthesis of zeolites like ZSM-5, which are silico-aluminates. Rice husk waste is available in wide range of particle sizes in agricultural farms. There is no study available in open literature on use of these wide particle ranges for its direct application. This paper is an attempt to use wide particle size rice husk, its effect on ZSM-5 synthesis and its physico-chemical properties. Further these prepared ZSM-5 catalyst was evaluated for benzylation of mesitylene reaction. The study found that, rice husk of 600 mu m particle size is optimum as far as ZSM-5 synthesis, its physicochemical properties and further its application in mesitylene benzylation reaction.

10aMesitylene10aParticle size10arice husk10aSilica Source10aZSM-51 aGhuge, Gorakh1 aNiphadkar, Prashant1 aRathod, Simmy1 aBokade, Vijay, V. uhttp://library.ncl.res.in/content/effect-rice-husk-particle-size-zsm-5-physico-chemical-properties-selective-formation-13502264nas a2200193 4500008004100000022001400041245014500055210006900200260000900269300001200278490000700290520153100297100002901828700002201857700001801879700002001897700002201917856013101939 2021 eng d a0887-062400aOne-pot cascade conversion of renewable furfural to levulinic acid over a bifunctional H3PW12O40SiO2 catalyst in the absence of external H-20 aOnepot cascade conversion of renewable furfural to levulinic aci cJAN  a539-5450 v353 a

The conversion of biomass-derived furfural (FUR) to levulinic acid (LA), a versatile platform chemical, involves catalytic hydrogenation of FUR followed by acid hydrolysis to LA. However, this two-step process demands expensive separation and purification of the furfuryl alcohol (FAL) intermediate. Herein, we demonstrate an ingenious catalytic strategy for the one-pot cascade conversion of FUR to LA over a bifunctional catalyst without using pure external H-2. Isopropyl alcohol (IPA) served a dual role as a hydrogen donor and solvent while inhibiting the side reactions. Catalysts with a tunable surface area and acidity were synthesized by impregnating different percentages of H3PW12O40 (heteropolyacid) over a SiO2 support. The bifunctionality of the H3PW12O40/SiO2 catalyst is ascribed to the mutual coexistence of Lewis and Brvinsted acid sites. The Lewis acid sites imparted by active W metal sites adsorb hydrogen proton for catalytic transfer hydrogenation of FUR to FAL, while the predominant Brvinsted acid sites catalyze the hydrolysis of FAL to LA. Consequently, H3PW12O40/SiO2 revealed to be a potential catalyst producing an similar to 51% LA yield under optimized reaction conditions. Moreover, the catalyst was found to be reusable for three catalytic cycles. This study paves the way to develop future biorefinery, particularly direct conversion of FUR to LA over a bifunctional catalyst with a liquid H-donor, in an environmentally benign manner and comply with the green chemistry principles.

1 aNandiwale, Kakasaheb, Y.1 aVishwakarma, Mona1 aRathod, Simmy1 aSimakova, Irina1 aBokade, Vijay, V. uhttp://library.ncl.res.in/content/one-pot-cascade-conversion-renewable-furfural-levulinic-acid-over-bifunctional-h3pw12o40sio202027nas a2200217 4500008004100000022001400041245012300055210006900178260000800247520122800255653001701483653001701500653002801517653002301545653002401568100002601592700001801618700002001636700002201656856013101678 2021 eng d a1011-372X00aReview on selective production of acetophenone from oxidation of ethylbenzene over heterogeneous catalysts in a decade0 aReview on selective production of acetophenone from oxidation of cJAN3 a

The consumption of acetophenone (AP) is increasing worldwide because of its applications in products such as alcohol, aldehydes, resins, esters, fragrances, and pharmaceuticals. AP is manufactured via several methods like decomposition of cumene hydroperoxide, Hock process, and Friedel-Crafts acylation reaction using homogeneous catalysts with solvent and oxidant. However, it causes several environmental problems that deteriorate the production of AP with these methods. Oxidation of ethylbenzene (EB) is one of the promising methods to synthesize AP in liquid and vapor phases reaction using heterogeneous catalysts, which plays a vital role for selective production of AP. In this review, numerous heterogeneous catalysts are discussed including transition metal nanoparticles, transition metal complexes, and metal free catalysts (carbon nanotubes) used in last 10 years for oxidation of EB. Additionally, catalyst activity along with reaction parameters and its effect, mechanisms, and kinetics study are summarized in this article. The future scope of this reaction is also highlighted. Moreover, this work identifies best catalysts for bulk production of AP with high yield to satisfy global requirement.

10aacetophenone10aethylbenzene10aHeterogeneous catalysts10aOxidation reaction10areaction mechanisms1 aNandanwar, Sachin, U.1 aRathod, Simmy1 aBansal, Videsha1 aBokade, Vijay, V. uhttp://library.ncl.res.in/content/review-selective-production-acetophenone-oxidation-ethylbenzene-over-heterogeneous-catalysts